This study used 3D finite element analysis to model and compare stress distributions in Class II dental restorations made of ceramic or resin-composite materials. Three models were created: Model A with a glass-ceramic inlay, high modulus resin cement; Model B with the same glass-ceramic inlay and low modulus resin cement; Model C with a resin-composite inlay and low modulus resin cement. All models were subjected to vertical occlusal loading of 400N. The results showed complex stress patterns arising from both axial and lateral loading components. Ceramic inlays transferred more stress to tooth walls and cement layers, while resin-composite inlays distributed stress better. Application of low modulus luting materials helped
LABORATORY MODEL TESTS TO EFFECT OF DENSITY TO FILL MATERIAL ON THE PERFORMAN...IAEME Publication
The effective functioning of reinforced earth structures is very much dependent on the quality of materials and construction. Many times, due to poor quality of the materials used and poor quality control measures exercised, the density of the reinforced soil fill is not up to the design requirements, leading to underperformance or distress of the reinforced soil walls. Therefore, it becomes necessary to evaluate the level of underperformance vis-à-vis that of relative compaction. In view of this, in the present study, a series of laboratory experiments were carried out on a model soil wall of 300 mm high with vertical face, prepared at different density states of 95%, 80% and 70% of MDD of IS HCT. The wall was subjected to monotonic load applied through a model square footing of size (B) equal to 50 mm on the surface at an offset distance of 1(B). Similar tests were carried out on the soil wall reinforced with a Woven Geotextile in wrap around form; to study the effect of density on the performance of reinforced soil wall. The results indicated proportionality between relative compaction level and performance of soil wall without and with reinforcement.
IRJET - A Study on Shear Strength of Sand Reinforced with Glass FibersIRJET Journal
1) The study investigates the shear strength of sand reinforced with glass fibers through a series of direct shear tests.
2) The tests showed that the shear strength of sand increased with the addition of glass fibers, up to a fiber content of 2%. Higher fiber contents reduced dilation and increased shear strength.
3) Both the shear strength and stiffness of reinforced sand increased with higher relative density (compaction). Reinforced sand has potential applications in embankments and subgrades.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IRJET - Study on the Engineering Properties of Fibre-Reinforced Low Plast...IRJET Journal
This study investigated the engineering properties of low plasticity clay reinforced with glass fibers. A series of tests were conducted including compaction tests and unconfined compressive strength tests with varying fiber contents from 0-1.25%. The results showed that the optimum moisture content increased and maximum dry density decreased slightly with the addition of fibers. The unconfined compressive strength significantly improved with the addition of fibers up to a content of 0.75%, showing a 194% increase over the unreinforced soil strength. Above 0.75% fiber content, the strength began to decrease. Therefore, glass fiber reinforcement was found to be an effective method to improve the strength of low plasticity clay soils.
This document summarizes a numerical study of indentation-induced cracking in brittle coatings on ductile substrates. Finite element modeling was used to simulate indentation with a spherical indenter. The coating was modeled as linear elastic, the substrate as elastic-perfectly plastic, and cracks in the coating were modeled using cohesive surfaces. Circumferential cracks were found to initiate at the coating surface near the contact edge due to high tensile radial stresses. The first crack caused a kink in the load-displacement curve. The spacing between cracks was on the order of the coating thickness. The effects of material properties and cohesive parameters on crack initiation and spacing were also investigated.
Research Experience for Undergraduates : Comparative flexural behaviour of ce...Nishanth Patil
ABSTRACT :
A material with both strength and ductility is the need of the hour, and more so in the construction industry. Since reinforced concrete sections are relatively less ductile in compression and shear, flexural yielding is an attractive proposition, ensuing ductile behaviour of the structural elements and their connections. The much-celebrated union of the quasi-brittle cement matrix and ductile steel reinforcement is plagued by stiffness degradation, which subsequently hampers the structures ability to adapt to load reversals, unexpected overloading post-construction, settlement effects etc. In addition, the deformation incompatibility between the matrix and the reinforcement leads to non-uniform strain distribution in reinforcement and composite matrix, high interfacial bond stress, disintegration at loads lower than the expected capacity of the composite section, ultimately affecting serviceability of the structure.
The flexural performance of cement composites reinforced with Carbon black (CB) and Carbon fibres (CF) was investigated according to ASTM D790-2003 and IS 516-1999.The variation in flexural behaviour like flexural strength, flexural modulus, toughness index, ductility index and displacement at failure was different according to the proportion of CB used. Though the use of CB only, did not show promising results mainly owing to stiffening of the composite, the trends observed when CB was hybridized with CF were encouraging, primarily leading to a 44 % increase in toughness and 32% increase in the ductility index over the plain cement sample for an optimum loading of 5% CB and 0.25% CF by wt of cement. Although the mechanical strength of pure CB composites is reduced, but they satisfy the basic requirements of lightweight construction materials.
For Indepth Conclusions and Analytics, Contact the undersigned :
Nishanth A, Patil : +91 72045 76727
EXPERIMENTAL STUDY ON BEHAVIOR OF COIR FIBRE REINFORCED CONCRETEIAEME Publication
Conventional concrete is robust in compression and weak in tension in order to swamp the weakness natural fibre is being equipped. The adoption of inherent fibres as edifice constituents is boon to procure a livable production. The comprehensive mission of this exploration is to stake out the discernible inspection of natural fibre in concrete structure. The coir fibre freshly tempted an influence as a workable fibre composite material, due to certain precise mechanical property which can be compared to artificial fibre. The coir fibre is treated using natural fluid before using in concrete, so that it is not be affected by moisture content presented in concrete. In this tentative study coir fibre is extant consumed in concrete thereby, the mechanical properties such as compressive strength, split-tensile strength, and modulus of rupture of M30Grade concrete and by capricious the spoonful of fibre gratified from0%, 2% 4%,6% and 8%. Stimulation should be given for the appliance of natural fibres which are regionally procurable materials, in the domain of civil engineering.
Soil sheet pile interaction part ii numerical analysis and simulationIAEME Publication
This document summarizes a study that uses numerical analysis to investigate the interaction between soil and an embedded sheet pile wall. Finite element modeling was used to analyze sheet pile walls embedded in both homogeneous and heterogeneous soil strata. The results showed variations between theoretical conventional design approaches and the numerical analysis results for both anchored and cantilevered sheet pile walls. Specifically, the numerical analysis showed cases where deformation was overestimated by up to 31.28% when assuming homogeneous soil compared to modeling heterogeneous soil layers. Additional numerical modeling analyzed replacing steel reinforcement with carbon fiber reinforced polymer in concrete sheet piles installed in corrosive shoreline environments. This modeling showed little variation in horizontal deformation between conventional steel and CFRP reinforcement.
LABORATORY MODEL TESTS TO EFFECT OF DENSITY TO FILL MATERIAL ON THE PERFORMAN...IAEME Publication
The effective functioning of reinforced earth structures is very much dependent on the quality of materials and construction. Many times, due to poor quality of the materials used and poor quality control measures exercised, the density of the reinforced soil fill is not up to the design requirements, leading to underperformance or distress of the reinforced soil walls. Therefore, it becomes necessary to evaluate the level of underperformance vis-à-vis that of relative compaction. In view of this, in the present study, a series of laboratory experiments were carried out on a model soil wall of 300 mm high with vertical face, prepared at different density states of 95%, 80% and 70% of MDD of IS HCT. The wall was subjected to monotonic load applied through a model square footing of size (B) equal to 50 mm on the surface at an offset distance of 1(B). Similar tests were carried out on the soil wall reinforced with a Woven Geotextile in wrap around form; to study the effect of density on the performance of reinforced soil wall. The results indicated proportionality between relative compaction level and performance of soil wall without and with reinforcement.
IRJET - A Study on Shear Strength of Sand Reinforced with Glass FibersIRJET Journal
1) The study investigates the shear strength of sand reinforced with glass fibers through a series of direct shear tests.
2) The tests showed that the shear strength of sand increased with the addition of glass fibers, up to a fiber content of 2%. Higher fiber contents reduced dilation and increased shear strength.
3) Both the shear strength and stiffness of reinforced sand increased with higher relative density (compaction). Reinforced sand has potential applications in embankments and subgrades.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IRJET - Study on the Engineering Properties of Fibre-Reinforced Low Plast...IRJET Journal
This study investigated the engineering properties of low plasticity clay reinforced with glass fibers. A series of tests were conducted including compaction tests and unconfined compressive strength tests with varying fiber contents from 0-1.25%. The results showed that the optimum moisture content increased and maximum dry density decreased slightly with the addition of fibers. The unconfined compressive strength significantly improved with the addition of fibers up to a content of 0.75%, showing a 194% increase over the unreinforced soil strength. Above 0.75% fiber content, the strength began to decrease. Therefore, glass fiber reinforcement was found to be an effective method to improve the strength of low plasticity clay soils.
This document summarizes a numerical study of indentation-induced cracking in brittle coatings on ductile substrates. Finite element modeling was used to simulate indentation with a spherical indenter. The coating was modeled as linear elastic, the substrate as elastic-perfectly plastic, and cracks in the coating were modeled using cohesive surfaces. Circumferential cracks were found to initiate at the coating surface near the contact edge due to high tensile radial stresses. The first crack caused a kink in the load-displacement curve. The spacing between cracks was on the order of the coating thickness. The effects of material properties and cohesive parameters on crack initiation and spacing were also investigated.
Research Experience for Undergraduates : Comparative flexural behaviour of ce...Nishanth Patil
ABSTRACT :
A material with both strength and ductility is the need of the hour, and more so in the construction industry. Since reinforced concrete sections are relatively less ductile in compression and shear, flexural yielding is an attractive proposition, ensuing ductile behaviour of the structural elements and their connections. The much-celebrated union of the quasi-brittle cement matrix and ductile steel reinforcement is plagued by stiffness degradation, which subsequently hampers the structures ability to adapt to load reversals, unexpected overloading post-construction, settlement effects etc. In addition, the deformation incompatibility between the matrix and the reinforcement leads to non-uniform strain distribution in reinforcement and composite matrix, high interfacial bond stress, disintegration at loads lower than the expected capacity of the composite section, ultimately affecting serviceability of the structure.
The flexural performance of cement composites reinforced with Carbon black (CB) and Carbon fibres (CF) was investigated according to ASTM D790-2003 and IS 516-1999.The variation in flexural behaviour like flexural strength, flexural modulus, toughness index, ductility index and displacement at failure was different according to the proportion of CB used. Though the use of CB only, did not show promising results mainly owing to stiffening of the composite, the trends observed when CB was hybridized with CF were encouraging, primarily leading to a 44 % increase in toughness and 32% increase in the ductility index over the plain cement sample for an optimum loading of 5% CB and 0.25% CF by wt of cement. Although the mechanical strength of pure CB composites is reduced, but they satisfy the basic requirements of lightweight construction materials.
For Indepth Conclusions and Analytics, Contact the undersigned :
Nishanth A, Patil : +91 72045 76727
EXPERIMENTAL STUDY ON BEHAVIOR OF COIR FIBRE REINFORCED CONCRETEIAEME Publication
Conventional concrete is robust in compression and weak in tension in order to swamp the weakness natural fibre is being equipped. The adoption of inherent fibres as edifice constituents is boon to procure a livable production. The comprehensive mission of this exploration is to stake out the discernible inspection of natural fibre in concrete structure. The coir fibre freshly tempted an influence as a workable fibre composite material, due to certain precise mechanical property which can be compared to artificial fibre. The coir fibre is treated using natural fluid before using in concrete, so that it is not be affected by moisture content presented in concrete. In this tentative study coir fibre is extant consumed in concrete thereby, the mechanical properties such as compressive strength, split-tensile strength, and modulus of rupture of M30Grade concrete and by capricious the spoonful of fibre gratified from0%, 2% 4%,6% and 8%. Stimulation should be given for the appliance of natural fibres which are regionally procurable materials, in the domain of civil engineering.
Soil sheet pile interaction part ii numerical analysis and simulationIAEME Publication
This document summarizes a study that uses numerical analysis to investigate the interaction between soil and an embedded sheet pile wall. Finite element modeling was used to analyze sheet pile walls embedded in both homogeneous and heterogeneous soil strata. The results showed variations between theoretical conventional design approaches and the numerical analysis results for both anchored and cantilevered sheet pile walls. Specifically, the numerical analysis showed cases where deformation was overestimated by up to 31.28% when assuming homogeneous soil compared to modeling heterogeneous soil layers. Additional numerical modeling analyzed replacing steel reinforcement with carbon fiber reinforced polymer in concrete sheet piles installed in corrosive shoreline environments. This modeling showed little variation in horizontal deformation between conventional steel and CFRP reinforcement.
This document summarizes a study on the interfacial friction properties of sand reinforced with geocells. Modified direct shear tests were conducted on sand with three different geocell arrangements that varied the cell diameter. Two types of geonets that differed in tensile strength were used to fabricate the geocells. Results showed that sand-geocell interfaces exhibited adhesion unlike unreinforced sand interfaces. The tensile stiffness of the geocell material influenced the interface friction characteristics, in addition to cell pocket size. Interfacial shear strength increased and friction angle decreased with decreasing cell diameter due to greater soil confinement by smaller cells.
Developing A Prediction Model for Tensile Elastic Modulus of Steel Fiber – Ce...IJRESJOURNAL
ABSTRACT: This paper attempts to develop a prediction model that can be used in line with prescribed laboratory experiments for indirect tensile test such that tensile elastic modulus can be predicted for cement stabilized lateritic soil reinforced with steel fiber using measured properties of the material. The results of the tensile elastic modulus obtained from the Derived Prediction Model almost nearly replicates that obtained from calculations from laboratory experimentation. Results obtained revealed that both the predicted values and calculated values have a linear correlation with an R2 of 96.4%. On this basis the Derived Prediction Model can be said to be valid within the limits of the study.
IRJET- Experimental and Analytical Study on Masonry Panels Strengthened with ...IRJET Journal
This document presents an experimental and analytical study comparing the strength of masonry panels strengthened with geotextile strips in different patterns. Masonry walls are vulnerable to seismic loads due to their high mass and lack of ductility. Geotextiles have been used to strengthen masonry panels and improve their seismic performance. Experimental testing was conducted on masonry panels with and without geotextile strengthening under diagonal compression. Analytical models were also developed using finite element software to simulate the panel behavior and compare results. The study aims to evaluate the in-plane strength improvement of masonry panels strengthened with locally available geotextiles in different geometric patterns.
Ruredil has over 60 years of experience in developing new sustainable building products and technologies. Their RureGold and Ruredil X Mesh reinforcement systems use fibers like PBO and carbon to strengthen structures and improve safety during earthquakes. In 2013, Ruredil obtained product certification for its FRCM composite systems under the AC 434 standard, demonstrating their effectiveness. Italian building regulations allow for the use of unconventional materials like Ruredil's FRCM systems if they are properly certified. Ruredil's systems have been shown to improve the earthquake performance of structures like schools, religious buildings, infrastructure, and historic buildings.
IRJET- Study of the Strength Characteristics of the Soil Processed with F...IRJET Journal
This document summarizes an ongoing study on the strength characteristics of soil processed with fly ash and Recron 3S fibers. The study aims to improve the strength of clayey soil, which has issues like high shrinkage, swelling, and low bearing capacity. Fly ash acts as a cementing material while Recron 3S fibers act as reinforcement. Tests were performed to determine the optimum moisture content, maximum dry density, unconfined compression strength, and shear strength of mixtures with varying proportions of fly ash (10-50%) and Recron 3S fibers (0.2-1.0%). Previous research found that addition of fibers increases the failure load of soil. The current study aims to determine the optimum mix proportions to maximize
Improving the Properties of Self-compacted Concrete with Using Combined Silic...Pouyan Fakharian
The viscosity is the main property of self- compacted concrete (SCC) and using of pozzolan material such as metakaolin (MK) and Silica fume (SF) can help to achieve that goal. The effect of simultaneous substitution of MK and SF instead of cement on the rheological and mechanical properties of self-compacted concrete was experimentally investigated in this paper. Seventeen mix designs were cast with a substitution weight percentage (5, 10, 15, 20 %) in water to adhesive material ratio equal 0.32. All mixes were examined by compressive, tensile strengths and water absorption tests with an appropriate fluidity, without having signs of segregation or instability. The test results were indicated that the SCC mixes containing MK and SF had higher compressive and tensile strengths in comparison with no-pozzolan concrete. The comparison of linear multiple regression techniques (LMRT) and nonlinear multiple regression technique outputs with experimental results showed an appropriate similarity.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
Background/Objectives: The Effect of Bottom Ash over the Soil is carried out by conducting Suitable Soil Experiments.
Methods/Statistical Analysis:
Experiments such as Standard Proctor Test (SPT), Unconfined Compressive strength (UCS) and California Bearing Ratio (CBR) repeatedly over the soil for different percentages of bottom as such as 8%, 12% and 16% by weights and the results are analyzed with respective to the results obtained for the natural soil. The experiments are conducted as per Indian standards of light compaction.
Findings: The results show the increasing values of maximum dry density and the UCS values for treated sample and there is a decrease of CBR value with the addition of bottom ash. The maximum dry densities obtained for natural soil, treated soil sample with 8%, 12% and 16% of bottom ash are 17KN/m3, 21 KN/m3, 22 KN/m3 and 20 KN/m3 respectively and thus a maximum of 22 KN/m3 for 12% addition of bottom ash.
Improvements/Applications: Thus, the Optimum Moisture Content of 16% for natural soil and 11.5%, 11% and 13% for the 8%, 12% and 16% of treated soil. Similarly, the UCS values for the Natural soil, treated soil for 8%, 12% and 16% as 270 KN/m2, 265 KN/m2, 350 KN/m2 and 230 KN/m2, thus having maximum for 12% of treated soil. But the CBR values are shown poor results as 3.66% for natural soil and 2.18%, 2.35% and 1.98% for respective percentages of treated soil for 8%, 12% and 16% of bottom ash.
This study evaluated three composite resins (Z100, Clearfil Ray-Posterior, and Prisma TPH) used to restore 120 posterior teeth over 24 months. Clinical evaluations were performed every 6 months using Ryge criteria and stone casts, while direct evaluations assessed color match, margins, anatomy, etc. Results found that all materials were suitable for posterior restorations. Some Z100 and Prisma TPH restorations showed marginal crevices. Clearfil Ray-Posterior alone showed slight surface roughness. Direct and indirect evaluation results differed for Z100 and Prisma TPH, attributed to method sensitivity.
This document discusses research on using Recron 3S fiber to improve the strength properties of silty subgrade soil in Kurukshetra, India. Laboratory experiments were conducted that included index tests, modified Proctor compaction tests, CBR tests, and UCS tests on the silty soil alone and mixed with 0.15%, 0.30%, 0.45%, and 0.60% Recron 3S fiber by dry weight of soil. The results showed that the addition of Recron 3S fiber increased the maximum dry density, CBR values, and UCS of the silty soil. The greatest improvements were seen at the lowest fiber content of 0.15%. Therefore, Recron 3S fiber has potential
IRJET- Effect of Glass Fiber Volume and Mineral Admixture Contents on the Beh...IRJET Journal
This document summarizes research on the effect of glass fiber volume and mineral admixtures on the behavior of high performance fiber reinforced concrete (HPFRC). It discusses how HPFRC was produced using fly ash, metakaolin, and superplasticizer to improve mechanical and durability properties. The mechanical properties tested included compressive, split tensile, and flexural strength at various ages. Durability properties like water absorption, chloride penetration, and acid resistance were also evaluated. The results showed that HPFRC with optimal fiber and mineral admixture contents can achieve high strength and satisfy durability requirements for classification as a high performance cementitious composite.
Because of the excellent strength of concrete reinforced with fibers pulled in the
consideration of researchers throughout the most recent decades. The proposed
technique manages the experimental investigation to determine the properties of
Ternary Blended Fiber Reinforced Concrete (TBFRC) with the assistance of soft
computing methodology performed in MATLAB software. In the present experimental
examination a mix design of M50 is tried at utilizing ternary blend of Ground
Granulated Blast Furnace Slag (GGBS), Fly Ash (FA) and Metakaolin (MK) as
partial replacement by weight of concrete at different mixing rates running between
0% – 30% with extra steel and polypropylene fibers. Here, the mechanical properties,
for example, compressive strength, split tensile strength, and flexural strength, are
anticipated by utilizing Deep Learning Neural Network (DNN) strategy with various
fiber rate. The input factors for the neural network depict the materials and different
mix extents of concrete. In this network structure, the weights are enhanced by
utilizing Adaptive Crow Search Algorithm (ACSA). Additionally by utilizing this
system of ternary blended fiber reinforced concrete is delivered at a sensible cost than
that of traditional concrete. In addition, the Optimal DNN predicted the mechanical
properties optimally for all curing days (28, 56, and 90 days) compared with
experimental and existing strategies (ANN).
This study comparatively evaluated the quality, performance and utilization limits of
three locally manufactured cement brands in Botswana using the laboratory experiments conducted
on mortar and concrete specimens produced from the brands. The study identified the physical
characteristics of three cement brands designated A, B and C, as well as the strength and durability of
the concrete and mortar produced from such cements under varying operational and exposure
conditions to establish a limit of application for each cement considered. The physical tests performed
on cement were loss on ignition (LOI) and particle size distribution. Compressive strength test and
the resistance to carbonate and sulphate attack were investigated on concrete and mortar. Cement
type A had similar physical characteristics to C but proved to be the most workable compared to the
other cements. It however produced the lowest strength in both concrete and mortar but showed
desirable durability limits. Durability assessment of the cement-based products found cement type B
as the best with the most desirable physical properties. Cement type B gave the highest strength in
concrete, while cement type C was found to be the most suitable for mortar.
Effect of discrete_fiber_reinforcement_on_soil_tenShuhaib Mohammed
This document describes a study that investigated the effect of discrete fiber reinforcement on soil tensile strength. An innovative tensile testing apparatus was developed to directly measure the tensile strength of fiber-reinforced soil specimens. A series of direct tensile tests were performed on specimens with varying fiber content, dry density, and water content. The results showed that the inclusion of discrete fibers significantly increased the tensile strength and ductility of soil. Specifically, tensile strength increased with higher fiber content, dry density, and lower water content. The mechanism by which fibers improve tensile strength is through fiber pull-out resistance due to interfacial mechanical interaction between the fiber surface and soil matrix.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental Investigation on Replacement of Cement in Concrete Partially by ...ijtsrd
Concrete is the most extremely used construction material within the world, which always uses natural resources like lime, aggregates and water. The production of cement in world has increased greatly, due to this cement production emission of CO2 gas has been increased tremendously, ultimately environmental pollution increased to very large extent. This affect to environment has been reduced by cement has been replaced by some supplementary materials like Dolamite Powder or Fly ash or GGBS and so on. Dolamite. Powder was conducted detailed study and lots of research work has been made on other waste materials and it is found there is a great future scope for research on Dolamite Powder as a replacement to cement, sand or both. Now in our case, cement has been replaced partially with in varying proportions likewise from 0 to 20 and its effect has been analysed on the standard consistency, soundness, setting times of cement and compressive strength of cement mortar mixes. The cubes and cylinders of concrete were casted for variable content of dolomite powder. Pramod Dhamne | Dr. P. B. Nagarnaik ""Experimental Investigation on Replacement of Cement in Concrete Partially by using Dolamite Powder"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23035.pdf
Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/23035/experimental-investigation-on-replacement-of-cement-in-concrete-partially-by-using-dolamite-powder/pramod-dhamne
MODELS FOR CONFINED CONCRETE COLUMNS WITH FIBER COMPOSITESIAEME Publication
Many studies have been done to find a convenient representation of physical behavior Fiber Reinforced Polymers for strengthening or retrofitted techniques which can enhance stress-strain performance of existing reinforced concrete structures. FRP composites are used for strengthening applications mainly due to the lightweight, high compressive strength, resistance to corrosion, speed and ease of application and formed on site. Conceptually, the s tress strain relation of concrete as a non-homogenous and nonlinear composite material is not unique that depends on the many variables.
“Influence of particle index of coarse aggregate and its influences on proper...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Shear Strength Prediction of Reinforced Concrete Shear Wall Using ANN, GMDH-N...Pouyan Fakharian
To provide lateral resistance in structures as well as buildings, there are some types of structural systems such as shear walls. The utilization of lateral loads occurs on a plate on the wall's vertical dimension. Conventionally, these sorts of loads are transferred to the wall collectors. There is a significant resistance between concrete shear walls and lateral seismic loading. To guarantee the building's seismic security, the shear strength of the walls has to be prognosticated by using models. This paper aims to predict shear strength by using Artificial Neural Network (ANN), Neural Network-Based Group Method of Data Handling (GMDH-NN), and Gene Expression Programming (GEP). The concrete's compressive strength, the yield strength of transverse reinforcement, the yield strength of vertical reinforcement, the axial load, the aspect ratio of the dimensions, the wall length, the thickness of the reinforced concrete shear wall, the transverse reinforcement ratio, and the vertical reinforcement ratio are the input parameters for the neural network model. And the shear strength of the reinforced concrete shear wall is considered as the target parameter of the ANN model. The results validate the capability of the models predicted by ANN, GMDH-NN, and GEP, which are suitable for use as a tool for predicting the shear strength of concrete shear walls with high accuracy.
The document describes a life cycle analysis (LCA) modeling study of a photovoltaic (PV) module. It discusses the methodology, including defining the functional unit as producing electricity at 12% efficiency over 1 year from a specified PV module. It describes data collection from the various production plants and modeling the production phase in TEAM software. Key results shown are that production accounts for over 99% of primary energy/greenhouse gas impacts and almost all water consumption, with electricity production and glass manufacturing being the most significant contributors.
This document discusses composite material repair methodologies. It begins by defining a composite material as one made of two or more materials with different properties combined to produce a new material with unique characteristics. It then discusses some common applications of composite materials in airplanes. The main types of composite damage on airplanes are then outlined, such as impact damage, erosion, scratches, and damage through the full structure. Various repair techniques are presented, including non-patching methods like resin infusion as well as patching methods like bonded external patches and bonded scarf patches. Equipment used for repairs like vacuum bags are also depicted. Finally, the document concludes that reliable repair methods are necessary to restore structural integrity to composite materials increasingly used in aircraft.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
This document summarizes a study on the interfacial friction properties of sand reinforced with geocells. Modified direct shear tests were conducted on sand with three different geocell arrangements that varied the cell diameter. Two types of geonets that differed in tensile strength were used to fabricate the geocells. Results showed that sand-geocell interfaces exhibited adhesion unlike unreinforced sand interfaces. The tensile stiffness of the geocell material influenced the interface friction characteristics, in addition to cell pocket size. Interfacial shear strength increased and friction angle decreased with decreasing cell diameter due to greater soil confinement by smaller cells.
Developing A Prediction Model for Tensile Elastic Modulus of Steel Fiber – Ce...IJRESJOURNAL
ABSTRACT: This paper attempts to develop a prediction model that can be used in line with prescribed laboratory experiments for indirect tensile test such that tensile elastic modulus can be predicted for cement stabilized lateritic soil reinforced with steel fiber using measured properties of the material. The results of the tensile elastic modulus obtained from the Derived Prediction Model almost nearly replicates that obtained from calculations from laboratory experimentation. Results obtained revealed that both the predicted values and calculated values have a linear correlation with an R2 of 96.4%. On this basis the Derived Prediction Model can be said to be valid within the limits of the study.
IRJET- Experimental and Analytical Study on Masonry Panels Strengthened with ...IRJET Journal
This document presents an experimental and analytical study comparing the strength of masonry panels strengthened with geotextile strips in different patterns. Masonry walls are vulnerable to seismic loads due to their high mass and lack of ductility. Geotextiles have been used to strengthen masonry panels and improve their seismic performance. Experimental testing was conducted on masonry panels with and without geotextile strengthening under diagonal compression. Analytical models were also developed using finite element software to simulate the panel behavior and compare results. The study aims to evaluate the in-plane strength improvement of masonry panels strengthened with locally available geotextiles in different geometric patterns.
Ruredil has over 60 years of experience in developing new sustainable building products and technologies. Their RureGold and Ruredil X Mesh reinforcement systems use fibers like PBO and carbon to strengthen structures and improve safety during earthquakes. In 2013, Ruredil obtained product certification for its FRCM composite systems under the AC 434 standard, demonstrating their effectiveness. Italian building regulations allow for the use of unconventional materials like Ruredil's FRCM systems if they are properly certified. Ruredil's systems have been shown to improve the earthquake performance of structures like schools, religious buildings, infrastructure, and historic buildings.
IRJET- Study of the Strength Characteristics of the Soil Processed with F...IRJET Journal
This document summarizes an ongoing study on the strength characteristics of soil processed with fly ash and Recron 3S fibers. The study aims to improve the strength of clayey soil, which has issues like high shrinkage, swelling, and low bearing capacity. Fly ash acts as a cementing material while Recron 3S fibers act as reinforcement. Tests were performed to determine the optimum moisture content, maximum dry density, unconfined compression strength, and shear strength of mixtures with varying proportions of fly ash (10-50%) and Recron 3S fibers (0.2-1.0%). Previous research found that addition of fibers increases the failure load of soil. The current study aims to determine the optimum mix proportions to maximize
Improving the Properties of Self-compacted Concrete with Using Combined Silic...Pouyan Fakharian
The viscosity is the main property of self- compacted concrete (SCC) and using of pozzolan material such as metakaolin (MK) and Silica fume (SF) can help to achieve that goal. The effect of simultaneous substitution of MK and SF instead of cement on the rheological and mechanical properties of self-compacted concrete was experimentally investigated in this paper. Seventeen mix designs were cast with a substitution weight percentage (5, 10, 15, 20 %) in water to adhesive material ratio equal 0.32. All mixes were examined by compressive, tensile strengths and water absorption tests with an appropriate fluidity, without having signs of segregation or instability. The test results were indicated that the SCC mixes containing MK and SF had higher compressive and tensile strengths in comparison with no-pozzolan concrete. The comparison of linear multiple regression techniques (LMRT) and nonlinear multiple regression technique outputs with experimental results showed an appropriate similarity.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
Background/Objectives: The Effect of Bottom Ash over the Soil is carried out by conducting Suitable Soil Experiments.
Methods/Statistical Analysis:
Experiments such as Standard Proctor Test (SPT), Unconfined Compressive strength (UCS) and California Bearing Ratio (CBR) repeatedly over the soil for different percentages of bottom as such as 8%, 12% and 16% by weights and the results are analyzed with respective to the results obtained for the natural soil. The experiments are conducted as per Indian standards of light compaction.
Findings: The results show the increasing values of maximum dry density and the UCS values for treated sample and there is a decrease of CBR value with the addition of bottom ash. The maximum dry densities obtained for natural soil, treated soil sample with 8%, 12% and 16% of bottom ash are 17KN/m3, 21 KN/m3, 22 KN/m3 and 20 KN/m3 respectively and thus a maximum of 22 KN/m3 for 12% addition of bottom ash.
Improvements/Applications: Thus, the Optimum Moisture Content of 16% for natural soil and 11.5%, 11% and 13% for the 8%, 12% and 16% of treated soil. Similarly, the UCS values for the Natural soil, treated soil for 8%, 12% and 16% as 270 KN/m2, 265 KN/m2, 350 KN/m2 and 230 KN/m2, thus having maximum for 12% of treated soil. But the CBR values are shown poor results as 3.66% for natural soil and 2.18%, 2.35% and 1.98% for respective percentages of treated soil for 8%, 12% and 16% of bottom ash.
This study evaluated three composite resins (Z100, Clearfil Ray-Posterior, and Prisma TPH) used to restore 120 posterior teeth over 24 months. Clinical evaluations were performed every 6 months using Ryge criteria and stone casts, while direct evaluations assessed color match, margins, anatomy, etc. Results found that all materials were suitable for posterior restorations. Some Z100 and Prisma TPH restorations showed marginal crevices. Clearfil Ray-Posterior alone showed slight surface roughness. Direct and indirect evaluation results differed for Z100 and Prisma TPH, attributed to method sensitivity.
This document discusses research on using Recron 3S fiber to improve the strength properties of silty subgrade soil in Kurukshetra, India. Laboratory experiments were conducted that included index tests, modified Proctor compaction tests, CBR tests, and UCS tests on the silty soil alone and mixed with 0.15%, 0.30%, 0.45%, and 0.60% Recron 3S fiber by dry weight of soil. The results showed that the addition of Recron 3S fiber increased the maximum dry density, CBR values, and UCS of the silty soil. The greatest improvements were seen at the lowest fiber content of 0.15%. Therefore, Recron 3S fiber has potential
IRJET- Effect of Glass Fiber Volume and Mineral Admixture Contents on the Beh...IRJET Journal
This document summarizes research on the effect of glass fiber volume and mineral admixtures on the behavior of high performance fiber reinforced concrete (HPFRC). It discusses how HPFRC was produced using fly ash, metakaolin, and superplasticizer to improve mechanical and durability properties. The mechanical properties tested included compressive, split tensile, and flexural strength at various ages. Durability properties like water absorption, chloride penetration, and acid resistance were also evaluated. The results showed that HPFRC with optimal fiber and mineral admixture contents can achieve high strength and satisfy durability requirements for classification as a high performance cementitious composite.
Because of the excellent strength of concrete reinforced with fibers pulled in the
consideration of researchers throughout the most recent decades. The proposed
technique manages the experimental investigation to determine the properties of
Ternary Blended Fiber Reinforced Concrete (TBFRC) with the assistance of soft
computing methodology performed in MATLAB software. In the present experimental
examination a mix design of M50 is tried at utilizing ternary blend of Ground
Granulated Blast Furnace Slag (GGBS), Fly Ash (FA) and Metakaolin (MK) as
partial replacement by weight of concrete at different mixing rates running between
0% – 30% with extra steel and polypropylene fibers. Here, the mechanical properties,
for example, compressive strength, split tensile strength, and flexural strength, are
anticipated by utilizing Deep Learning Neural Network (DNN) strategy with various
fiber rate. The input factors for the neural network depict the materials and different
mix extents of concrete. In this network structure, the weights are enhanced by
utilizing Adaptive Crow Search Algorithm (ACSA). Additionally by utilizing this
system of ternary blended fiber reinforced concrete is delivered at a sensible cost than
that of traditional concrete. In addition, the Optimal DNN predicted the mechanical
properties optimally for all curing days (28, 56, and 90 days) compared with
experimental and existing strategies (ANN).
This study comparatively evaluated the quality, performance and utilization limits of
three locally manufactured cement brands in Botswana using the laboratory experiments conducted
on mortar and concrete specimens produced from the brands. The study identified the physical
characteristics of three cement brands designated A, B and C, as well as the strength and durability of
the concrete and mortar produced from such cements under varying operational and exposure
conditions to establish a limit of application for each cement considered. The physical tests performed
on cement were loss on ignition (LOI) and particle size distribution. Compressive strength test and
the resistance to carbonate and sulphate attack were investigated on concrete and mortar. Cement
type A had similar physical characteristics to C but proved to be the most workable compared to the
other cements. It however produced the lowest strength in both concrete and mortar but showed
desirable durability limits. Durability assessment of the cement-based products found cement type B
as the best with the most desirable physical properties. Cement type B gave the highest strength in
concrete, while cement type C was found to be the most suitable for mortar.
Effect of discrete_fiber_reinforcement_on_soil_tenShuhaib Mohammed
This document describes a study that investigated the effect of discrete fiber reinforcement on soil tensile strength. An innovative tensile testing apparatus was developed to directly measure the tensile strength of fiber-reinforced soil specimens. A series of direct tensile tests were performed on specimens with varying fiber content, dry density, and water content. The results showed that the inclusion of discrete fibers significantly increased the tensile strength and ductility of soil. Specifically, tensile strength increased with higher fiber content, dry density, and lower water content. The mechanism by which fibers improve tensile strength is through fiber pull-out resistance due to interfacial mechanical interaction between the fiber surface and soil matrix.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental Investigation on Replacement of Cement in Concrete Partially by ...ijtsrd
Concrete is the most extremely used construction material within the world, which always uses natural resources like lime, aggregates and water. The production of cement in world has increased greatly, due to this cement production emission of CO2 gas has been increased tremendously, ultimately environmental pollution increased to very large extent. This affect to environment has been reduced by cement has been replaced by some supplementary materials like Dolamite Powder or Fly ash or GGBS and so on. Dolamite. Powder was conducted detailed study and lots of research work has been made on other waste materials and it is found there is a great future scope for research on Dolamite Powder as a replacement to cement, sand or both. Now in our case, cement has been replaced partially with in varying proportions likewise from 0 to 20 and its effect has been analysed on the standard consistency, soundness, setting times of cement and compressive strength of cement mortar mixes. The cubes and cylinders of concrete were casted for variable content of dolomite powder. Pramod Dhamne | Dr. P. B. Nagarnaik ""Experimental Investigation on Replacement of Cement in Concrete Partially by using Dolamite Powder"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23035.pdf
Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/23035/experimental-investigation-on-replacement-of-cement-in-concrete-partially-by-using-dolamite-powder/pramod-dhamne
MODELS FOR CONFINED CONCRETE COLUMNS WITH FIBER COMPOSITESIAEME Publication
Many studies have been done to find a convenient representation of physical behavior Fiber Reinforced Polymers for strengthening or retrofitted techniques which can enhance stress-strain performance of existing reinforced concrete structures. FRP composites are used for strengthening applications mainly due to the lightweight, high compressive strength, resistance to corrosion, speed and ease of application and formed on site. Conceptually, the s tress strain relation of concrete as a non-homogenous and nonlinear composite material is not unique that depends on the many variables.
“Influence of particle index of coarse aggregate and its influences on proper...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Shear Strength Prediction of Reinforced Concrete Shear Wall Using ANN, GMDH-N...Pouyan Fakharian
To provide lateral resistance in structures as well as buildings, there are some types of structural systems such as shear walls. The utilization of lateral loads occurs on a plate on the wall's vertical dimension. Conventionally, these sorts of loads are transferred to the wall collectors. There is a significant resistance between concrete shear walls and lateral seismic loading. To guarantee the building's seismic security, the shear strength of the walls has to be prognosticated by using models. This paper aims to predict shear strength by using Artificial Neural Network (ANN), Neural Network-Based Group Method of Data Handling (GMDH-NN), and Gene Expression Programming (GEP). The concrete's compressive strength, the yield strength of transverse reinforcement, the yield strength of vertical reinforcement, the axial load, the aspect ratio of the dimensions, the wall length, the thickness of the reinforced concrete shear wall, the transverse reinforcement ratio, and the vertical reinforcement ratio are the input parameters for the neural network model. And the shear strength of the reinforced concrete shear wall is considered as the target parameter of the ANN model. The results validate the capability of the models predicted by ANN, GMDH-NN, and GEP, which are suitable for use as a tool for predicting the shear strength of concrete shear walls with high accuracy.
The document describes a life cycle analysis (LCA) modeling study of a photovoltaic (PV) module. It discusses the methodology, including defining the functional unit as producing electricity at 12% efficiency over 1 year from a specified PV module. It describes data collection from the various production plants and modeling the production phase in TEAM software. Key results shown are that production accounts for over 99% of primary energy/greenhouse gas impacts and almost all water consumption, with electricity production and glass manufacturing being the most significant contributors.
This document discusses composite material repair methodologies. It begins by defining a composite material as one made of two or more materials with different properties combined to produce a new material with unique characteristics. It then discusses some common applications of composite materials in airplanes. The main types of composite damage on airplanes are then outlined, such as impact damage, erosion, scratches, and damage through the full structure. Various repair techniques are presented, including non-patching methods like resin infusion as well as patching methods like bonded external patches and bonded scarf patches. Equipment used for repairs like vacuum bags are also depicted. Finally, the document concludes that reliable repair methods are necessary to restore structural integrity to composite materials increasingly used in aircraft.
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There are several methods for joining advanced composites, each with advantages and disadvantages. Mechanical joining methods like bolts/screws allow for easy repair and inspection but can reduce strength. Adhesive bonding provides excellent strength but joints are difficult to repair and inspect. Stitching increases toughness but also introduces defects. The best approach depends on the application and needs of the specific composite structure. Choosing the proper joining method requires careful consideration of factors like strength requirements, inspectability, repair needs, and manufacturing process.
Additive Manufacturing (2.008x Lecture Slides)A. John Hart
Slides accompanying 2.008x* video module on Additive Manufacturing, Prof. John Hart, MIT, 2016.
*Fundamentals of Manufacturing Processes on edX: https://www.edx.org/course/fundamentals-manufacturing-processes-mitx-2-008x
This document summarizes a seminar on additive manufacturing technologies. It discusses the history of 3D printing, which was developed in 1984. It then describes several common additive manufacturing techniques like selective laser sintering, fused deposition modeling, and stereolithography. Applications of 3D printing discussed include uses in architecture, automotive, medical, food, and aerospace. The document outlines advantages like reduced costs and complex geometries along with disadvantages like high machine costs and size limitations. It concludes by noting the growing scope of additive manufacturing.
This document provides guidelines for preparing class II inlay restorations. It describes initial procedures like evaluating occlusion and administering anesthesia. It discusses preparing the occlusal outline, proximal box, bevels, and flares. Modifications for specific tooth shapes and situations are covered. Preparation variations like slices and flares are explained. Special considerations for abutment teeth and root surface lesions are also summarized. The document provides a thorough overview of class II inlay preparation techniques.
The document discusses the clinical technique for composite restoration. It covers initial procedures like local anesthesia and shade selection. It then discusses tooth preparation, including cavity designs like conventional, beveled conventional, modified box shape, and facial/lingual slot. Matrix placement and isolation of the operating site are also covered. Pulp protection and restorative techniques are briefly mentioned.
- An inlay is a restoration constructed externally and then cemented into a prepared tooth cavity. An onlay covers one or more cusps and adjoining occlusal surface.
- Indirect restorations like inlays and onlays are used for large restorations, endodontically treated teeth at risk of fracture, and dental rehabilitation with cast metals. They allow for better control of contours compared to direct restorations.
- Disadvantages include requiring more appointments, higher chair time, need for temporary restorations, higher costs, and being more technique sensitive.
Dental veneers are thin shells that are bonded to the front of teeth to improve aesthetics or repair damage. There are three main types: conventional porcelain veneers, lumineers, and composite resin veneers. Conventional porcelain veneers require tooth structure removal and are fabricated from porcelain, providing very natural-looking results. Lumineers are extremely thin porcelain shells that can be bonded without tooth preparation. Composite resin veneers are made from dental composite but do not last as long as porcelain options. The document outlines the procedures for conventional porcelain veneers, including tooth preparation, temporaries, impressions, cementation, and finishing. Placement of lumineers is also described.
This document discusses factors that affect bonding to intraradicular dentin in endodontics. It covers differences between coronal and radicular dentin, how instrumentation can create a smear layer, and how various endodontic materials and procedures like irrigation, bleaching, and retreatment can impact bonding. Root canal anatomy and the inability to control moisture present unique challenges for achieving effective adhesion. Resin-based sealers and core filling materials that utilize adhesive technology are also discussed as ways to potentially improve bonding and sealing of root canals.
The document discusses product life cycle management from concept development through commercialization, maturity, and end of life. It covers integrating product life cycle management with related areas like new product development, supply chain management, and customer relationship management. Key aspects of PLM include managing all product data and changes throughout the life cycle, integrating data across systems, and collaborating with internal and external stakeholders.
Additive manufacturing, also known as 3D printing, involves building 3D objects layer by layer from digital models. The document discusses the current state and future potential of 7 additive manufacturing processes, including stereolithography, material jetting, binder jetting, material extrusion, powder bed fusion, sheet lamination, and directed energy deposition. It also identifies gaps in technology, materials, design, modeling, and education/training that must be addressed for additive manufacturing to become more widely used for mass production. Recommendations include increased collaboration between universities and industry to advance the technology and reduce costs.
The document discusses the history and development of dentin bonding agents over several generations from the 1970s to 2000s. It covers key topics such as the role of the smear layer, conditioning of dentin, components of bonding agents, and critical steps for clinical use. Dentin bonding agents have evolved from early attempts at chemical bonding to current multi-step and self-etching adhesives that provide both mechanical and chemical bonding via a hybrid layer between resin and dentin. Proper isolation, acid-etching, moisture control, and curing technique are important for achieving optimal bond strength.
Influence of Thrust, Torque Responsible for Delamination in drilling of Glass...IDES Editor
Glass fabric sandwich composites are potentially
growing materials which satisfies the low strength to weight
fraction, thermal conductivity, high strength and long
operational lifetime required for key engineering applications
especially in the field of Mechanical and Aerospace structures.
With their wide range of application, their manufacturing
and machinability characteristics are interesting to
investigate. Drilling is one of the prime manufacturing
processes used in assembly lines of components for fastening
and joining two components. In this study, Glass Fabric – Epoxy
/ Rigid polyurethane foam sandwich hybrid composite is drilled
in Arix VMC 100 CNC drilling machine using High Speed
Steel (HSS) drill bit of three different diameters of 6 mm, 8
mm and 10 mm. A L9 orthogonal array is setup to investigate
the result. Two main parameters that contribute to
delamination are thrust and torque. Thus in this
investigation, thrust and torque responsible for the effect of
delamination and hole quality is studied experimentally.
Scanning Electron Microscope (SEM) images are taken for
the drilled hole laminate to support the result.
A STUDY ON STRESS-STRAIN BEHAVIOUR OF TIE CONFINED CONCRETE CONTAINING CERAMI...IRJET Journal
This document presents a study on the stress-strain behavior of concrete containing ceramic tile waste and waste tire rubber as partial replacements for coarse and fine aggregates. Concrete specimens of standard grade M40 and high-strength M70 were produced with 4% replacement by weight of both aggregates. The specimens were confined with mild steel or HYSD steel ties to investigate the effect of confinement. Testing was conducted to determine compressive strength and stress-strain curves, from which ductility and other parameters were calculated. The results show that confinement increased the ductility and strength of both concrete grades.
This document discusses a study that investigated the fracture behavior of pervious concrete specimens with varying pore structures and fiber contents. The researchers tested notched beams in three-point bending to characterize fracture toughness and critical crack tip opening displacement. They used stereological and morphological methods to analyze the pore structures of the concrete mixtures from images. The results showed that fracture toughness depended primarily on porosity, and higher porosity or larger pore sizes reduced toughness. Fibers had a greater effect on post-peak response in mixtures with higher porosity. Pore spacing and tortuosity helped explain these effects. A statistical model and sensitivity analysis quantified the influence of pore structure features and fiber content on fracture toughness.
This study evaluated the marginal and internal adaptation of class II composite inlays made with or without different resinous bases after mechanical loading. Forty human molars were prepared with class II cavities and assigned to five groups: four with different resinous bases (two flowable composites, a compomer, and a restorative composite) and one control with no base. Composite inlays were made for each tooth and subjected to mechanical loading. Marginal and internal adaptation were assessed before, during, and after loading using scanning electron microscopy. Preliminary results found marginal tooth fracture ranged from 30.7-37.6% across groups, while marginal opening in dentin ranged from 9.2-30.1% depending
This document provides a literature review and summary of finite element modeling of polymer nanocomposite adhesives. It reviews 10 papers on experimental and modeling studies of adhesive bonds. The document identifies gaps in research on shear strength estimation and limited exploration of adherend materials. The objective is to develop a 2D finite element model of a single-lap adhesive joint to analyze the effects of nanoparticle-filled adhesive on joint strength. The summary provides essential information on the topic, literature reviewed, research gaps identified and objective of further study.
The influences-of-various-matrices-and-silanization-on-the-bond-strengthbetwe...Alexandru danici
This research article studied the bond strength between resin cores and glass fiber posts with different matrices and the effects of silanization. Forty Rebilda posts with methacrylate matrices and 40 Er Dentin posts with epoxy resin matrices were used. Three core materials designed for core build-up and one hybrid composite were tested. Silane was applied to half the posts. Specimens were tested using a push-out test and SEM. The bond strength was higher for Rebilda posts compared to Er Dentin posts. Silanization increased bond strength. Core materials designed for build-up showed higher bond strengths than the hybrid composite. The highest bond strength was between Rebilda posts with silane and Rebilda core material.
Study on Stress-Strain behaviour of M50 Grade High Strength Glass Fibre Reinf...Venkataraju Badanapuri
Self-compacting concrete (SCC) can be defined as a fresh concrete which possesses superior flowability under maintained stability
(i.e., no segregation) thus allowing self-compaction—that is, material consolidation without addition of energy. It was first developed in Japan
in 1988 in order to achieve durable concrete structures by improving quality in the construction process. This was also partly in response to the
reduction in the numbers of skilled workers available in the industry. This paper outlines a brief history of SCC from its origins in Japan to the
development of the material throughout Europe. Research and development into SCC in the UK and Europe are discussed, together with a look
at the future for the material in Europe and the rest of the world
Study of Materials Properties Made of Steel, Stainless Steel, Aluminium, and ...ijtsrd
The number of areas in units is currently reducing daily due to the large population. Earlier, when populations werent as large, they continued to employ the horizontal arrangement due to the large area available per person . However, individuals today choose the vertical system tall building due to scarcity of area . All of the forces acting on the structure, including its own weight and the grounds ability to support it, must be taken into consideration. STAAD PRO will facilitate the process. Static analysis, seismic analysis, and natural frequency are examples of problems that STAAD PRO can address with IS CODE. Mohammed Uvaish Mansoori | Rajesh Misra "Study of Materials Properties Made of Steel, Stainless Steel, Aluminium, and Concrete While Applying the Total Load to the Geometry" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-7 | Issue-1 , February 2023, URL: https://www.ijtsrd.com/papers/ijtsrd52787.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/52787/study-of-materials-properties-made-of-steel-stainless-steel-aluminium-and-concrete-while-applying-the-total-load-to-the-geometry/mohammed-uvaish-mansoori
Experimental Study on Strength of Concrete with Addition of Chopped Glass FiberIRJET Journal
This study experimentally investigated the effect of adding chopped glass fibers on the strength properties of concrete. Glass fibers were added at 0.3%, 0.5%, and 0.7% of the total binder content. The compressive strength, split tensile strength, and flexural strength of concrete specimens containing different amounts of glass fibers were tested at 7 and 28 days. The results showed that the strengths increased with higher glass fiber content, with the 0.7% fiber mix achieving the highest strengths. Non-destructive rebound hammer and ultrasonic pulse velocity tests also indicated that concretes with glass fibers had better strength and quality than plain concrete without fibers.
This document presents a study that aims to develop correlations between uniaxial compressive strength (UCS) and point load index (I50) for single and double jointed rocks. Over 180 plaster samples were prepared with different joint conditions like orientation, roughness, and number of joints. Samples were tested for UCS and I50. Statistical analysis identified two groups of jointed rocks that showed different trends between UCS and I50. Multiple linear regression was used to develop new correlation equations for each group to predict UCS from I50 for jointed rocks. The proposed equations were compared to previous studies and may be applied to actual rocks like weathered limestone.
Modeling Fabrication and Testing of Artificial Gecko Adhesion using Multi Lay...IJLT EMAS
The idea of designing a micro level artificial gecko
adhesive structure is inspired from ability of geckos to climb any
surface. Gecko can climb any rough or smooth surface because
of its hierarchical structure present on feet which functions as a
smart adhesive [1]. The key parameter that affects gecko
adhesion are pattern periodicity of a synthetic setae, hierarchical
structure, length, diameter, angle, size, stiffness of end tips and
flexibility of a base [2]. The design and fabrication of number of
single and multi-level hierarchical pattern were performed. CO2
LASER cutting machine having power of 60 W is used to
manufacture moulds. The mould is fabricated from methyl
methacrylate sheets of different thickness 3 mm to 10 mm.
Liquid silicone polymer PDMS is used as a cast material. Various
patterns having dimensionsupto200 micrometer with different
tip shapes and geometries were fabricated. For single level
patterns like dense pattern, mushroom shape pattern and wedge
pattern (lamellar structure) were fabricated. Attempts were
made to design and fabricate Multi-level hierarchical structure
patterns that mimics gecko like foot structure. These micro level
artificial gecko structure have large scope of applications such as
climbing robots, non-sticky adhesion tapes, military surveillance
and even medical applications.
STUDY ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CHOPPED CARBON FIBER...IAEME Publication
As compared to conventional concrete the benefits of SCC comprising more strength like non SCC, may be higher due to better compaction, similar tensile strength like non SCC, modulus of elasticity may be slightly lower because of higher paste, slightly higher creep due to paste, shrinkage as normal concrete, better bond strength, fire resistance similar as non SCC, durability better for better surface concrete. Incorporation of fibers further enhances its properties specially related to post crack behavior of SCC. The fibers used in the study are 12 mm long chopped glass fiber and carbon fiber. The volume fraction of fiber taken is 0%, 0.1%, 0.15%, 0.2%. The project comprised of two stages.
This paper aims to submit the report the aesthetic correction in a disharmonious smile and unsatisfactory composite restorations in anterior teeth who were treated with direct aesthetic restorative procedure. The results show the use of this technique to allows an immediate aesthetic quality, directly and inexpensively restoring the natural features of the smile.
Key words: Composite Resin,Class IV, Aesthetic.
This document summarizes a study on the modal analysis of adhesively bonded joints of different materials. Specifically, it investigates the natural frequencies and mode shapes of single-lap epoxy adhesive joints between aluminum, copper, and steel plates using finite element analysis software. The results show that the natural frequencies are directly proportional to the ratio of the materials' Young's modulus and density. Aluminum and steel joints have similar natural frequencies due to having the same modulus-density ratio, while copper joint frequencies differ since it has a unique ratio. Understanding the dynamic characteristics of bonded joints through modal analysis can aid in vibration-resistant design and control of engineered systems.
A Study of Failure Criteria of Fibrous Composite Material...sudhakargeruganti
This research proposal aims to study the failure criteria of fibrous composite materials. The researcher will evaluate existing composite failure criteria in finite element analysis software and explore modifications to account for large deformations, progressive failure, and stress-strain interactions. Several composite failure theories will be presented and their advantages/limitations in modeling laminate failure will be discussed. Experimental testing will be conducted to validate the analysis results. The research intends to improve understanding and modeling of failure in fibrous composites.
Seismic response of frp strengthened rc frameiaemedu
This document discusses research on strengthening reinforced concrete (RC) frames with fiber-reinforced plastic (FRP). It summarizes previous studies on using FRP to strengthen beams and columns. However, few studies have analyzed FRP-strengthened RC frames as a whole system. The present study uses finite element analysis to model RC frames strengthened with varying FRP thicknesses and investigates their seismic response. Models of 2-bay, 3-story and 3-bay, 5-story frames are analyzed for different crack locations. The results are intended to help develop design criteria for seismic retrofitting of RC frames with FRP.
This document summarizes a study on the friction mechanisms of fresh concrete under pressure. It discusses how friction occurs in many civil engineering applications and influences concrete pressure on formwork. Tribometer tests were conducted on different concrete mixes to study how parameters like plate roughness, sliding velocity, concrete mix design, grain size, and water reducers influence friction stress. The concrete mixes tested ranged from normal concrete to self-compacting concrete. Test results provide insight into adapting mix designs for applications and developing friction models for fresh concrete.
Finite Elements Modeling and Analysis of Double Skin Composite PlatesIOSR Journals
Abstract: Double skin composite (DSC) is a form of “steel/concrete/steel” sandwich structure; the steel plates
are connected to a sandwiched concrete core with welded stud shear connectors. In the present paper, a finite
element model for Double Skin Composite (DSC) panels subjected to quasi-static loading is developed. A series
of quasi-static finite elements models are used to analyze deformation and energy absorption capacity of such
system, when perforated by rigid penetrator with conical nose shape. Pilot test model is used to investigate the
failure pattern in the composite panel. The obtained results are compared to the experimental results; good
agreements are obtained between finite element and previous experimental results. Results show that such
elements have great ability of absorbing energy when subjected to perforation due to ductility of lower plate
skin and vertical stiffness of lower shear studs.
- Video recording of this lecture in English language: https://youtu.be/Pt1nA32sdHQ
- Video recording of this lecture in Arabic language: https://youtu.be/uFdc9F0rlP0
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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Nano-gold for Cancer Therapy chemistry investigatory projectSIVAVINAYAKPK
chemistry investigatory project
The development of nanogold-based cancer therapy could revolutionize oncology by providing a more targeted, less invasive treatment option. This project contributes to the growing body of research aimed at harnessing nanotechnology for medical applications, paving the way for future clinical trials and potential commercial applications.
Cancer remains one of the leading causes of death worldwide, prompting the need for innovative treatment methods. Nanotechnology offers promising new approaches, including the use of gold nanoparticles (nanogold) for targeted cancer therapy. Nanogold particles possess unique physical and chemical properties that make them suitable for drug delivery, imaging, and photothermal therapy.
PGx Analysis in VarSeq: A User’s PerspectiveGolden Helix
Since our release of the PGx capabilities in VarSeq, we’ve had a few months to gather some insights from various use cases. Some users approach PGx workflows by means of array genotyping or what seems to be a growing trend of adding the star allele calling to the existing NGS pipeline for whole genome data. Luckily, both approaches are supported with the VarSeq software platform. The genotyping method being used will also dictate what the scope of the tertiary analysis will be. For example, are your PGx reports a standalone pipeline or would your lab’s goal be to handle a dual-purpose workflow and report on PGx + Diagnostic findings.
The purpose of this webcast is to:
Discuss and demonstrate the approaches with array and NGS genotyping methods for star allele calling to prep for downstream analysis.
Following genotyping, explore alternative tertiary workflow concepts in VarSeq to handle PGx reporting.
Moreover, we will include insights users will need to consider when validating their PGx workflow for all possible star alleles and options you have for automating your PGx analysis for large number of samples. Please join us for a session dedicated to the application of star allele genotyping and subsequent PGx workflows in our VarSeq software.
Debunking Nutrition Myths: Separating Fact from Fiction"AlexandraDiaz101
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STUDIES IN SUPPORT OF SPECIAL POPULATIONS: GERIATRICS E7shruti jagirdar
Unit 4: MRA 103T Regulatory affairs
This guideline is directed principally toward new Molecular Entities that are
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Osvaldo Bernardo Muchanga-GASTROINTESTINAL INFECTIONS AND GASTRITIS-2024.pdfOsvaldo Bernardo Muchanga
GASTROINTESTINAL INFECTIONS AND GASTRITIS
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Gastrointestinal Infections
GASTROINTESTINAL INFECTIONS result from the ingestion of pathogens that cause infections at the level of this tract, generally being transmitted by food, water and hands contaminated by microorganisms such as E. coli, Salmonella, Shigella, Vibrio cholerae, Campylobacter, Staphylococcus, Rotavirus among others that are generally contained in feces, thus configuring a FECAL-ORAL type of transmission.
Among the factors that lead to the occurrence of gastrointestinal infections are the hygienic and sanitary deficiencies that characterize our markets and other places where raw or cooked food is sold, poor environmental sanitation in communities, deficiencies in water treatment (or in the process of its plumbing), risky hygienic-sanitary habits (not washing hands after major and/or minor needs), among others.
These are generally consequences (signs and symptoms) resulting from gastrointestinal infections: diarrhea, vomiting, fever and malaise, among others.
The treatment consists of replacing lost liquids and electrolytes (drinking drinking water and other recommended liquids, including consumption of juicy fruits such as papayas, apples, pears, among others that contain water in their composition).
To prevent this, it is necessary to promote health education, improve the hygienic-sanitary conditions of markets and communities in general as a way of promoting, preserving and prolonging PUBLIC HEALTH.
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In addition to bacterial infections, gastritis and gastric ulcers are associated with several factors, with emphasis on prolonged fasting, chemical substances including drugs, alcohol, foods with strong seasonings including chilli, which ends up causing inflammation of the stomach walls and/or corrosion. of the same, resulting in the appearance of wounds and consequent gastritis or ulcers, respectively.
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The biomechanics of running involves the study of the mechanical principles underlying running movements. It includes the analysis of the running gait cycle, which consists of the stance phase (foot contact to push-off) and the swing phase (foot lift-off to next contact). Key aspects include kinematics (joint angles and movements, stride length and frequency) and kinetics (forces involved in running, including ground reaction and muscle forces). Understanding these factors helps in improving running performance, optimizing technique, and preventing injuries.
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Diagnosis and Staging
The diagnosis of HR+ breast cancer begins with clinical evaluation, imaging, and biopsy. Imaging modalities such as mammography, ultrasound, and MRI help in assessing the extent of the disease. Histopathological examination and immunohistochemical staining of the biopsy sample confirm the diagnosis and hormone receptor status by identifying the presence of estrogen receptors (ER) and progesterone receptors (PR) on the tumor cells.
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Selective Estrogen Receptor Modulators (SERMs): Tamoxifen is a SERM that binds to estrogen receptors, blocking estrogen from stimulating breast cancer cells. It is effective but may have side effects such as increased risk of endometrial cancer and thromboembolic events.
Aromatase Inhibitors (AIs): These drugs, including anastrozole, letrozole, and exemestane, lower estrogen levels by inhibiting the aromatase enzyme, which converts androgens to estrogen in peripheral tissues. AIs are generally preferred in postmenopausal women due to their efficacy and safety profile compared to tamoxifen.
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Chemotherapy
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1. Stress distributions in adhesively cemented
ceramic and resin-composite Class II inlay
restorations: a 3D-FEA study
Pietro Ausielloa,*, Sandro Rengoa
, Carel L. Davidsonb
, David C. Wattsc
a
Department of Cariology, School of Dentistry, University of Naples ‘Federico II’,
Policlinico Edificio 14, Via Pansini 5, Naples 80131, Italy
b
University of Amsterdam, Amsterdam, The Netherlands
c
University of Manchester Dental School, Manchester, UK
Received 4 November 2003; received in revised form 13 April 2004; accepted 11 May 2004
KEYWORDS
Dental materials;
3D finite elements
analysis;
Occlusal loading;
Stress-distribution
simulation;
Class II MOD inlay
restorations;
Resin cements
Summary Objectives: The purpose of this study was to investigate the effect of
differences in the resin-cement elastic modulus on stress-transmission to ceramic or
resin-based composite inlay-restored Class II MOD cavities during vertical occlusal
loading.
Methods: Three finite-element (FE) models of Class II MOD cavity restorations in an
upper premolar were produced. Model A represented a glass–ceramic inlay in
combination with an adhesive and a high Young’s modulus resin-cement. Model B
represented the same glass–ceramic inlay in combination with the same adhesive and
a low Young’s modulus resin-cement. Model C represented a heat-cured resin-
composite inlay in combination with the same adhesive and the same low Young’s
modulus resin cement. Occlusal vertical loading of 400 N was simulated on the FE
models of the restored teeth. Ansyse FE software was used to compute the local von
Mises stresses for each of the models and to compare the observed maximum
intensities and distributions. Experimental validation of the FE models was
conducted.
Results: Complex biomechanical behavior of the restored teeth became
apparent, arising from the effects of the axial and lateral components of the
constant occlusal vertical loading. In the ceramic-inlay models, the greatest von
Mises stress was observed on the lateral walls, vestibular and lingual, of the cavity.
Indirect resin-composite inlays performed better in terms of stress dissipation.
Glass–ceramic inlays transferred stresses to the dental walls and, depending on its
rigidity, to the resin-cement and the adhesive layers. For high cement layer
modulus values, the ceramic restorations were not able to redistribute the stresses
properly into the cavity. However, stress-redistribution did occur with the resin-
composite inlays.
Dental Materials (2004) 20, 862–872
www.intl.elsevierhealth.com/journals/dema
0109-5641/$ - see front matter Q 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
* Corresponding author. Tel.: C39-81-7462089; fax: C39-81-7462197.
E-mail address: pietausi@unina.it (P. Ausiello).
2. Significance: Application of low modulus luting and restorative materials do
partially absorb deformations under loading and limit the stress intensity,
transmitted to the remaining tooth structures.
Q 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Introduction
Resin-composites are limited for direct restoration
of the larger stress-bearing posterior Class II
cavities, on account of polymerization shrinkage
effects and some limitations in mechanical proper-
ties. Thermally post-cured resin-composite inlays,
however, are recommended in preference [1].
Thermal post-curing does improve the mechanical
qualities of composites [2,3]. Another advantage of
resin-composite inlays, instead of direct place-
ment, is that effects from the bulk curing-shrinkage
can be evaded.
As a further option for restoring large Class II
MOD restorations, strong ceramics are now avail-
able that can function properly without metal
support [4]. For both ceramic and composite
materials, adhesive cementation is imperative to
ensure reliable coherence of inlay and tooth
structure. Moreover, the cementation with (dual-
cure) cements has to be accompanied by appli-
cation of dentin bonding agents [5]. It is now
customary to use resin-based luting cements in
combination with dentin bonding agents for com-
posite and all-ceramic inlay restorations to enhance
(adhesive) retention and survival rates [6,7].
Unfortunately, luting also induces a significant
adverse effect. Luting creates a long and narrow
restoration, analogous to a Class I, made in
materials that are principally inferior to the usual
resin-composite restorative materials. This means
that a weaker and higher shrinking material is
inescapably present, that will set, moreover, in a
most unfavorable configuration (high C-value)
within the restored tooth [9]. Yet, with respect to
wall-to-wall adaptation, adhesively luted resin-
composite inlays score slightly better than direct
composite restorations, whilst ceramic-inlays per-
form as well as cast-gold inlays [4].
Notwithstanding their widespread application,
marginal integrity of tooth-colored direct or indir-
ect restorations remains a major problem in today’s
dentistry [8]. The cement layer is not only subject
to stresses that originate from curing shrinkage, but
also from mastication. Therefore, marginal and
internal adaptation of composite and ceramic inlays
should also be studied after loading and fatiguing
[10]. As a variety of materials with diverse
mechanical properties are involved in inlay design
and placement, analysis of the wall-to-wall integ-
rity of inlay-restored teeth requires that attention
be given to the elastic properties of the various
materials at the interfaces. For instance, it has
been demonstrated that incorporation of some
elasticity (lining) to the restoration may decrease
or even prevent interfacial separation [11–13].
However, particularly the fragile ceramic-inlays
still require rigid support. In indirect adhesive Class
II inlays, leakage often depends on the resin-
cement properties and on its mechanical behavior
[14]. Not only the shrinkage-strain, but the shrink-
age-stress magnitude and kinetics [15], the Young’s
modulus and the thickness of the cement determine
the totality of the developing stresses [16].
Ausiello et al. [17] showed, by means of a 3D
finite element analysis (FEA) model analysis, the
influence of occlusal loading and polymerization
shrinkage-strain on the stress-distribution in an
adhesive Class II MOD direct restoration for resin-
composites of different elastic modulus. Also the
influence of the adhesive-layer thickness on stress-
distribution was illustrated by 3D FEA [18].
The aim of the present study was to analyze by
3D FEA the stress-distribution in all materials
involved in adhesively luted Class II MOD inlay
restorations, of both ceramic and resin-composite
types.
Materials and methods
Finite element models
A 3D model of a human upper premolar, as used in a
previous study [18] was reused for this study. It was
realized by digitizing a plaster human upper-
premolar model on the scale of one to five with a
laser scanner (Cyber-ware). Crown and roots were
constructed in two different phases and sub-
sequently assembled.
For the crown, over 200 profiles were generated
at 0.33 mm increments by vertical and horizontal
scanning. Of these profiles, only 34 were selected,
17 vertical and 17 horizontal, at 2 mm increments,
for use in the external shape definition of the solid-
tooth model. Literature data on the tooth
Ceramic and composite inlay Class II behavior 863
3. morphology for the definition of the dentine and
enamel volumes [20] were used. The model data
were assembled in a 3D wire-frame structure by
means of a 3D CAD (Autocad 12, Autodesk, Inc.,
Neuchatel, Switzerland, 1992). The 3D curves were
exported into Pro-Engineer 16.0 (Parametric Tech-
nology Co., Waltham, MA, USA, 1994), where a solid
model was generated by fitting the horizontal and
vertical profiles. The model was cut in the cervical
area to obtain the final crown.
The roots were modeled by their mesial-distal
and buccal-lingual representations taken from
literature. The two representations were scanned
and eight vertical profiles were generated imitating
the scanned images. The roots were constructed by
fitting the vertical profiles. The pulp region was
obtained in an analogous way and subtracted from
the roots. The crown and the roots, with the pulp
chamber, were assembled in the final model.
A parametric cutting plane was chosen to
generate different cavities and MOD preparations.
In Fig. 1, the Class II MOD is shown (3.5 mm occlusal
width). The cavity design was characterized by flat
floor and sharp internal line angles. No bevel was
considered at the proximal and occlusal margins.
The preparation derived was flat from proximal to
proximal surface.
The solid model was transferred into a FEA
program (ANSYS Rel. 6.0, ANSYS, Inc., Houston,
TX, USA, 1994) where a 3D mesh was created. In the
previous work [18], we explained the volumes that
were redefined and meshed with 8-node-brick and
4-node-tetrahedral elements, resulting in 7282
elements (3376 hexahedral and 3906 tetrahedral
shape elements) and 5236 nodal structures.
Different material properties were now assigned
to the elements, according to the volume defi-
nition. In particular, in the previous study, the
adhesive layer was modeled in the FEM program
using spring elements connecting the nodes from
the cavity wall of the natural tooth with those of
the composite restoration [18]. In the present
study, technical enhancements in the finite
element model generation were used to increase
the structural relevance of the model itself.
The modeling of the adhesive area in the Class II
MOD preparation was differently realized. In this
case, where an indirect Class II MOD restoration-
type was simulated, one part of the adhesive area
was modeled to be the adhesive layer, contacting
the dental walls. The other part was modeled to be
the resin luting cement, contacting from one side
this adhesive layer and from the other side the
filling material (Fig. 2).
The new Class II MOD FE model used a different
element mesh-size (the size of all the elements was
reduced to obtain more detailed analysis results)
and a different methodology to simulate the resin
bonding and the luting cement layers. To investi-
gate the strain-status of the total adhesive area
under occlusal vertical loading simulation, shell
elements (with membrane behavior) were
employed both for the adhesive layer and for the
luting cement layer (Fig. 1), instead of the spring
elements used previously [18].
The volumes were redefined and meshed with
8-node brick and 4-node tetrahedral elements,
resulting in a 27,140-element and 18,244-node
structure, for a total solid elements number of
24,818. In particular, 1160 shell membrane
elements were used (Fig. 2). In Ansys 6.0 software
these elements are called shell 41 and they are 3D
characterized for each of the 4 nodes of the single
Figure 1 Finite element model of Class II MOD indirect
restoration of an upper premolar with particulars relative
to the shell modeling of the adhesive resin bonding and of
the cement layers.
Figure 2 Finite elements models of the cement and
adhesive layers.
P. Ausiello et al.864
4. element. Because of their low-thickness, they do
not show flexural deformation. In this way, it was
possible to better simulate the mechanical behavior
of these two different layers.
Experimental model validation
To validate this new Class II MOD FEM model,
compression loading measurements were per-
formed on sets of differently restored teeth until
fracture of the samples. These were the Class II
MOD designs, corresponding to Models A and C,
described below. Ten caries-free human upper
premolars were used for each test group. Class II
MOD cavities were prepared with a diamond bur at
high speed under water coolant. Axial and gingival
walls were cut non-retentively, at approximately
1008 angles. No bevels were prepared at the cavo-
surface enamel angles. For the Class II MOD
restoration, a heat-cured resin-composite with a
Young’s modulus of about 50 MPa (Gradia, GC,
Japan) was used. Unifil Bond adhesive (GC, Japan)
with a Young’s modulus of 4.5 MPa was applied on
the cavity walls. Unifil Flow (GC, Japan) with a
Young’s modulus of 9.6 MPa was used as resin luting
material.
The samples were inserted, as far as the
cementum–enamel junction, into steel cylindrical
rings with the apical root area in contact with the
steel-ring floor. Subsequently, spaces between
roots and steel walls were filled with rigid resin-
composite, so that only material deformation
within the tooth would be measurable. The test-
rings were clamped to the universal testing machine
and loading was applied vertically via a 6 mm
diameter steel cylinder, with the axis normal to
the tooth axis. To simulate one major occlusal
force, a 1 mm/min compression rate was used. The
vertical displacement and the axial load were
recorded until each restored tooth fractured. This
loading situation was also simulated using the FE
analysis, generating closely matched results
(Graph 1).
An important parameter to be considered was
the rigidity of the restored teeth, expressed under
the loading conditions used in this analysis. Two
components of rigidity were considered: axial and
lateral. Axial rigidity directly measures the resist-
ance to compressive forces. Lateral rigidity
measures cuspal-displacement under flexural load-
ing. Thus, the effect of the applied masticatory
loading was to provide both a compressive load to
the system and also displacement of the cusps.
The FE analysis performed was linear and static.
It used the over-position effect principle to
determine the axial rigidity comparative par-
ameter (%RCPA) and lateral rigidity comparative
parameter (%RCPL). They represent, in percentage,
the perceived rigidity variation of a system with
respect to an other reference rigidity. If they are
positive it means that the test system is more rigid
than reference system. In formulas:
%RCPA Z 1 K
axial ÿ movementperceived
axial ÿ movementreference
!100
%RCPL Z 1K
lateralÿmovementperceived
lateralÿmovementreference
!10
The sound tooth has been chosen as a reference
model in numerical calculations [20]. Results are
shown in Table 1.
Numerical simulation
The simplest approximation to the probable nature
of occlusal loading is where forces to the teeth are
applied statically and vertically. In all the FE
models investigated here, the external roots
nodes were constrained in all the spatial directions.
Adhesive mechanical properties are listed in Table 2
for all the restored tooth models.
The compression test with a 400 N occlusal load
was conducted. The loading cylinder was modeled
Graph 1 Validation data: showing the theoretical plot,
determined numerically, and the experimental plot of
axial load versus displacement.
Table 1 Rigidity comparison of the systems.
Model
G-lC
Model
G-hC
Model C Sound
tooth
%RCPA 4.29 5.00 K0.54 0.00
%RCPL 8.60 8.60 K2.10 0.00
Ceramic and composite inlay Class II behavior 865
5. as a 3D elastic beam (Fig. 3). End rotations were not
constrained. The common end was displaced in the
central position of the loading cylinder section in
the experimental test. The load was applied on the
tooth at two points (Fig. 3) through the beams
elements on the cusps (red areas). The resulting
force F crossing the central position of the loading
cylinder section was 400 N (Fig. 3, red arrow). The
beam elastic properties were treated as being
infinitely rigid compared to the tooth. Resin-
composite support was not modeled and it was
considered to be as rigid as the loading system.
Moreover, the following assumptions were made:
† A static linear numerical analysis was performed.
Thus, all materials were considered elastic
throughout the entire deformation, which is a
reasonable assumption for brittle materials in
non-failure conditions.
† Dentin is an elastic and isotropic material.
† Enamel was treated as mechanically homo-
geneous and isotropic, as in Refs. [19,20].
In Fig. 2, the different thicknesses of the two
interfacial layers is shown. The elements simulating
the luting cement and the adhesive are positioned
between the tooth and the filling material. We
hypothesize the perfect and absolute bonding
between the two materials. In the FE analysis
different conditions were simulated, modifying the
thickness of the cement, not varying the adhesive
resin bonding one, and including different filling
materials properties (Fig. 2). Three different
models of Class II MOD inlay restorations were
considered in order to simulate three different
clinical indirect restorations types.
Model A (G-hC, Glass-core ceramic with ‘high
modulus’ Cement), in which an high
modulus glass–ceramic filling material
was considered in combination with an
high modulus cement;
Model B (G-lC, Glass-core ceramic with ‘low mod-
ulus’ Cement), in which an high modulus
glass–ceramic filling material was con-
sidered in combination with a low modulus
cement;
Model C (Composite restoration), in which a heat-
cured resin-composite inlay was con-
sidered in combination with a low modulus
cement.
In all the combinations, one resin bonding system
was considered. Physical properties of the used
materials are presented in Table 2.
Results
Inspection of the results revealed critical zones
with particular stress behavior. The results are
presented in terms of von Mises stress maps in MPa,
which were computed within Ansys using the von
Mises shear-strain-energy failure criterion, as an
outcome of the 400 N occlusal loading. The figures
utilize a false-color non-linear scale for stress. It
should be understood that von Mises stress is
essentially an aggregate stress, sometimes termed
an octahedral stress. As such, it cannot be directly
decoded into specific contributions from tensile,
compressive or shear stress. However, other types
of output from most FE programs can provide such
information.
Figs. 4–6 show the varying biomechanics arising
from the differing rigidity of the three models: A, B
and C. These figures show, respectively, stresses
computed: at the surface of each model (Fig. 4a–c),
within each model cavity preparation (Fig. 5a–c),
within each MOD restoration (Fig. 5d–f) and (in
Fig. 6) from the interfacial areas (adhesive layerC
resin-cement layer) between the inlay restoration
Figure 3 The model structure is blocked avoiding
movement in the three directions of the space.
Table 2 Materials properties.
Material Elastic
modulus,
E (GPa)
Poisson
ratio
Thickness,
T (mm)
*Enamel 48 0.23
Dentine 18 0.2
Composite 50
Ceramic 90
Cement hm 10 70
Cement lm 6 70
Adhesive 4.5 10
*Verluis, 1996 [20]. Co., data.
P. Ausiello et al.866
6. and the cavity preparation. In these interfacial
areas, the biomechanical differences were
especially critical.
Experimental and theoretical validation curves
are compared in Graph 1. The two similar stress–
strain behaviors gave good support to the validity of
the model. Even the extreme (high strain) proper-
ties could be rather well approximated by the
theoretical curve. The experimental curve shows a
mild non-linear behavior near to the origin and a
linear behavior thereafter. This apparent non-
linearity was not due to a real material or
geometrical non-linearity but to the initial system
assessment that included effects due to contact and
sliding. These phenomena were unimportant in the
FE model validation.
The glass–ceramic-restored teeth, respectively
cemented with a high (10 GPa) and low (6 GPa)
modulus cement material (Models A and B; Fig. 4a
and b) may be compared with the behavior shown
in Fig. 4c of the composite-restored tooth (Model
C), luted with the low modulus cement. The
highest stress values of about 400–500 MPa for all
three models were concentrated on the cuspal
loading points. At the center of the occlusal
surface, for Models A and B, a stress value of
100–500 MPa was computed while for Model C it
was generally much lower, ranging from 40 to
100 MPa. All the tooth models were low-stressed
mesial-distally, with values of only 10–15 MPa. On
the vestibular and lingual sides, depending on the
displacement of cusps, stresses appeared higher,
about 20–40 MPa.
In Fig. 5a–c, analysis was conducted within the
cavity preparation, while the filling material was
extracted from the cavity itself. This was possible
Figure 4 (a) von Mises stress-distribution of Model A (G-hC). (b) von Mises stress-distribution of Model B (G-lC). (c) von
Mises stress-distribution of Model C.
Ceramic and composite inlay Class II behavior 867
7. because of the CAD/FE model configuration. Stres-
ses were particularly intense in Models A and B
(10–40 MPa) compared with Model C (1–5 MPa),
specifically localized on the vestibular and lingual
cavity walls of Models A and B (Fig. 5a and b).
In Model C, a lower modulus (50 GPa) heat-cured
composite resin was simulated.
In Fig. 5d–f is displayed the stress behavior within
the core of the restoration of Models A–C. Slight
differences are evident between the ceramic
restorations of Models A and B, where von Mises
stress values appear elevated but similar, irrespec-
tive of the modulus of the cement material used in
the two simulations. Stress is concentrated in the
core of the restoration, extending to the vestibular
and lingual sides of the restoration itself and totally
transmitted to the cavity walls, as already shown in
Fig. 5a and b.
In Fig. 5f, by contrast, where lower modulus
(50 GPa) resin-composite was used for restoration,
stress gradients from the internal area to the cavity
walls were lower, matching the distribution seen in
Fig. 5c.
In Fig. 6 are shown for the three models the stress-
distributions, as successive pairs, for the adhesive
and the resin-cement. The change of stress scale
(0–10 MPa) should be noted.
For the adhesive layer, no differences are evident
between ceramic Models A and B (Fig. 6a-1 and b-1).
For the cement layer, higher stress was apparent
with the higher modulus cement (Fig. 6a-2) com-
pared with the lower modulus lute (Fig. 6b-2).
Fig. 6c-1 and c-2 illustrates the interfacial stresses
for the adhesive and cement layers within composite
Model C. The lowest stress values were recorded for
this condition.
Figure 5 (a) von Mises stress-distribution within Model A (G-hC). (b) von Mises stress-distribution within Model B (G-lC).
(c) von Mises stress-distribution within Model C. (d) von Mises stress-distribution within the restoration of the Model A
(G-hC). (e) von Mises stress-distribution within the restoration of the Model B (G-lC). (f) von Mises stress-distribution
within the restoration of the Model C.
P. Ausiello et al.868
8. In Graph 1, a linear analysis on Model A and C
is represented in which it can be seen that
with increasing the loading from 400 to 800 N,
the stresses proportionally increase, leading to
a critical stress concentration in Model A, particu-
larly on the lingual cusp.
Discussion
Teeth in posterior regions are subject to functional
and para-functional forces of varying magnitudes
and directions. In vitro mechanical tests on Class II
adhesive posterior restorations revealed the differ-
ent aspects related to the stress-distribution
regarding the marginal and internal adaptation
of adhesive Class II restoration [21]. The role of
the filling material, of the adhesive resin and of the
resin cement was clearly demonstrated and results
indicated various important points to observe to
obtain high performance of the restoration itself.
The rigidity or elastic modulus of dental restorative
materials was considered extremely important at
the adhesive tooth-restoration interface.
In the present work, the FEA method was used to
investigate the stress-distribution resulting from
occlusal loading within the restoration and in
correspondence to that of the interfacial layers
(adhesive and cement) between the cavity walls
and the inlay materials.
An arbitrary load of 400 N was applied in this
test, which is probably lower than can be applied by
the teeth in vivo. Different data are reported on
this aspect. Tortopidis [22] found that 580 N was
Figure 5 (Continued)
Ceramic and composite inlay Class II behavior 869
9. the maximum bite force of healthy people in
posterior areas. Other investigations [23] suggested
that these values differ between males (522 N) and
females (441 N).
Under laboratory conditions, varied loading rates
can be applied to the samples to investigate
biomechanics of natural and restored teeth. In
particular, fracture resistance of Class II
Figure 6 (a-1) von Mises stress on Model G-hC, adhesive. (a-2) von Mises stress on Model G-hC, cement. (b-1) von Mises
stress on Model G-lC, adhesive. (b-2) von Mises stress on Model G-lC, cement. (c-1) von Mises stress on Model C, adhesive.
(c-2) von Mises stress on Model C, cement.
P. Ausiello et al.870
10. restorations in upper premolars submitted to
vertical loading has been experimentally investi-
gated [24]. It ranged for resin-composites in
combination with dentin bonding systems between
700 and 800 N. These data were also confirmed
recently [25], where the use of resin-composite and
ceromers as restorative materials was considered.
However, it was not the objective of this study to
determine the absolute numerical stress levels
created within the restoration but to examine
their distribution and localization. The software
used in this study was not programmed for evaluat-
ing the model to failure and therefore higher or
lower loads would only change the magnitude of the
stresses in the distribution pattern.
In the ceramic Models A and B, where a ceramic
inlay of high modulus (90 GPa) was used in
combination with 70 mm thick resin-cements of
two different Young’s moduli, no major differences
were found in terms of stress-distribution within
the restoration. However, when the inlay modulus
was reduced to 50 GPa, still in combination with the
same parameters for the cement layer, the stress-
distribution significantly changed. Comparing
Fig. 5d and e with Fig. 5f (respectively, Model A
and B, with Model C) the stress-distribution was
more intensive where the 90 GPa modulus inlay was
used and these stresses are almost totally trans-
ferred to the cavity walls, as shown in Fig. 5a and b;
whilst for the 50 GPa inlay (Fig. 5f), the stresses are
partially absorbed and partially transfered to the
cavity walls.
From the load-strain values as represented in
Fig. 3, it can be derived that a 400 N loading in
horizontal direction, when flexural deflections will
take place in the prepared brittle tooth structure,
destructive damage will occur earlier than with
vertical, occlusal loading.
Recently, Abu-Hassan et al. [26], used 3D-FEA to
investigate stress-distributions associated with
loaded ceramic onlay restorations with different
designs of marginal preparation. It was possible to
establish how vertical and horizontal forces act
differently in correspondence with the total mar-
gins of the restoration. Hence interesting con-
clusions could be drawn regarding the optimum
morphology of the butt-joint onlay preparation.
In our investigation, the 400 N axial simulations
showed that ceramic Models A and B transmitted
higher stress to the cavity walls than composite
Model C.
Fig. 4a and b shows that Class II MOD prep-
arations, restored by a 90 GPa ceramic inlay with
the same 4.5 GPa adhesive but with either a 10 or
6 GPa resin-cement, do not show a substantially
different stress-distribution after axial loading.
By contrast, in Model C, a 50 GPa resin-compo-
site inlay, with the same adhesive and the 6 GPa
resin-cement, showed a lower stress with a more
homogenous distribution. This indicates a greater
stress-dissipating effect of the relatively compliant
resin-composite than the more rigid glass–ceramic
inlay.
Sorensen and Munksgaard [5] concluded from
clinical trials that none of the dentin adhesives they
tested were able to completely prevent interfacial
gaps developing when inlays were cemented with a
dual-cure resin-cement. But in absence of the
adhesive, the failure rate was significantly higher.
The investigation of the interfacial zone
between the cavity and inlay margins has always
represented an important tool in laboratory inves-
tigations as well as in clinical reports.
A low-modulus poly-acid-modified glass-ionomer
cement used with ceramic-inlays resulted in a high
fracture rate and loss of marginal adaptation. The
marginal adaptation of the lute was more durable at
the enamel interface than that at the ceramic
interface [27].
When comparing Fig. 6a-2 and b-2, the higher
stresses in the contact area of the 10 GPa resin-
cement is clear. Further studies on the role of
cement layer thickness and minimal modulus to still
sufficiently support the ceramic inlay are in
progress.
Conclusions
From this FE analysis on stress-distribution in inlay-
restored Class II MOD cavities under axial load, it is
evident that both optimum stress magnitude and
distribution are best served with low modulus
restorative materials. FEA enabled investigation of
optimal conditions, material selection and their
interaction when adhesively restoring teeth. Class II
MOD restorations by glass core inlay materials
created higher stress levels at the cusp and at the
internal sides. Thermally post-cured resin-compo-
site Class II restorations presented elastic biome-
chanics similar to that of the sound tooth.
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