The document discusses the use of fiber reinforced concrete (FRC) for infrastructure applications such as canal lining and tunnel construction. It outlines several benefits of using FRC, including improved ductility, crack control, reduced permeability, and potential cost savings from faster construction. The author proposes developing standardized test methods, mixture designs, and design guidelines for using FRC in applications like precast concrete, shotcrete, and canal lining to optimize structural performance and durability. Guidelines from committees like ACI 544 are also discussed.
This document discusses developing fiber reinforced concrete specifications for structural and precast concrete applications. It outlines the project objectives to review existing FRC mixture proportioning procedures, develop typical mixes using local materials, recommend test and specification methods, and provide specifications for mechanical and durability properties. The tasks involve criteria for fibers in structural, repair, and shotcrete applications, and incorporating fibers in performance-based specifications. Applications discussed include seismic design, canal linings, precast panels, and tunnel linings.
The Mobasher Research Group at Arizona State University characterizes materials and structures from micro to macro scales. This includes testing fibers as small as 40 microns up to 4 meter tunnel segments, and experiments that take milliseconds up to months. The group develops sustainable composite materials for applications like transportation and water treatment using an automated pultrusion system to manufacture structural shapes from textile cement composites comparable to wood and steel. The large scale structural testing lab at ASU performs full scale testing and modeling on innovative composite materials and systems under bending loads up to 200 kips and axial loads up to 800 kips to analyze failure modes and develop design tools for tension, compression, and flexure. The group also works on ultra high performance
The document summarizes the activities of ACI Committee 544 on structural design approaches for fiber reinforced concrete. The committee focuses on education, codes and specifications, applications, sustainability, and producing reports on fundamentals, properties, testing, modeling, and design of fiber reinforced concrete. It identifies barriers to acceptance of fiber reinforced concrete like a lack of standardized testing methods and design tools. The committee is working to develop simplified constitutive models, durability and serviceability based design approaches, and emerging technology reports on applications like elevated slabs and tunnel segments to help overcome barriers and advance the use of fiber reinforced concrete.
This document summarizes opportunities for application development with textile reinforced concrete (TRC) materials. It discusses how TRC can provide improved mechanical properties like strength, ductility, and impact resistance compared to traditional glass and carbon reinforced materials. The document outlines accomplishments in developing codes and specifications for fiber and TRC use in construction. It also presents research on developing new TRC mixtures and structural shapes using locally available materials and optimized manufacturing processes like pultrusion. Test results demonstrate how TRC can provide higher strength, toughness, and crack control over varied length scales compared to short fiber systems.
The document discusses cement-based composites as sustainable infrastructure materials. It notes societal challenges around global warming, development and energy use that cement composites can help address. Fiber-reinforced cement composites provide benefits like increased ductility, durability, toughness and energy absorption. They allow for thinner cross-sections, reduced steel reinforcement, and improved structural performance under service and extreme loads. The document outlines applications of fiber cement composites in infrastructure like tunnels, canals, water tanks, and precast wall panels.
This document provides an outline for a presentation on sustainable infrastructure using fiber and textile reinforced concrete systems. The presentation covers the sustainability aspects of these materials, directions for textile reinforced concrete, experimental characterization of distributed cracking, analytical models for load-deflection behavior, and experimental verification. Collaborators from Arizona State University worked on manufacturing, material properties, analysis, and design of these sustainable composite infrastructure systems.
The document outlines Barzin Mobasher's presentation on textile reinforced concrete structural sections. The presentation covers the introduction of textile reinforced concrete and its sustainability aspects. It then discusses directions for textile reinforced concrete and developing structural sections using ultra-high performance concrete, fiber reinforced concrete, and textile reinforced concrete systems. The presentation also reviews experimental characterization of distributed cracking, parametric material models, analytical load-deflection solutions, experimental verification, and conclusions.
IRJET- Retrofitting of Reinforced Concrete Beam using Carbon Fiber Reinforced...IRJET Journal
This document summarizes an experiment that tested the flexural behavior of reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP) fabric. Four beams were cast and cured for 28 days. One beam was used as a control, while the other three were preloaded to induce initial cracking before being retrofitted with CFRP fabric. The CFRP strengthened the beams and increased their ultimate load capacity. The experiment investigated the effect of the CFRP fabric and its orientation on the beams' load capacity and failure mode.
This document discusses developing fiber reinforced concrete specifications for structural and precast concrete applications. It outlines the project objectives to review existing FRC mixture proportioning procedures, develop typical mixes using local materials, recommend test and specification methods, and provide specifications for mechanical and durability properties. The tasks involve criteria for fibers in structural, repair, and shotcrete applications, and incorporating fibers in performance-based specifications. Applications discussed include seismic design, canal linings, precast panels, and tunnel linings.
The Mobasher Research Group at Arizona State University characterizes materials and structures from micro to macro scales. This includes testing fibers as small as 40 microns up to 4 meter tunnel segments, and experiments that take milliseconds up to months. The group develops sustainable composite materials for applications like transportation and water treatment using an automated pultrusion system to manufacture structural shapes from textile cement composites comparable to wood and steel. The large scale structural testing lab at ASU performs full scale testing and modeling on innovative composite materials and systems under bending loads up to 200 kips and axial loads up to 800 kips to analyze failure modes and develop design tools for tension, compression, and flexure. The group also works on ultra high performance
The document summarizes the activities of ACI Committee 544 on structural design approaches for fiber reinforced concrete. The committee focuses on education, codes and specifications, applications, sustainability, and producing reports on fundamentals, properties, testing, modeling, and design of fiber reinforced concrete. It identifies barriers to acceptance of fiber reinforced concrete like a lack of standardized testing methods and design tools. The committee is working to develop simplified constitutive models, durability and serviceability based design approaches, and emerging technology reports on applications like elevated slabs and tunnel segments to help overcome barriers and advance the use of fiber reinforced concrete.
This document summarizes opportunities for application development with textile reinforced concrete (TRC) materials. It discusses how TRC can provide improved mechanical properties like strength, ductility, and impact resistance compared to traditional glass and carbon reinforced materials. The document outlines accomplishments in developing codes and specifications for fiber and TRC use in construction. It also presents research on developing new TRC mixtures and structural shapes using locally available materials and optimized manufacturing processes like pultrusion. Test results demonstrate how TRC can provide higher strength, toughness, and crack control over varied length scales compared to short fiber systems.
The document discusses cement-based composites as sustainable infrastructure materials. It notes societal challenges around global warming, development and energy use that cement composites can help address. Fiber-reinforced cement composites provide benefits like increased ductility, durability, toughness and energy absorption. They allow for thinner cross-sections, reduced steel reinforcement, and improved structural performance under service and extreme loads. The document outlines applications of fiber cement composites in infrastructure like tunnels, canals, water tanks, and precast wall panels.
This document provides an outline for a presentation on sustainable infrastructure using fiber and textile reinforced concrete systems. The presentation covers the sustainability aspects of these materials, directions for textile reinforced concrete, experimental characterization of distributed cracking, analytical models for load-deflection behavior, and experimental verification. Collaborators from Arizona State University worked on manufacturing, material properties, analysis, and design of these sustainable composite infrastructure systems.
The document outlines Barzin Mobasher's presentation on textile reinforced concrete structural sections. The presentation covers the introduction of textile reinforced concrete and its sustainability aspects. It then discusses directions for textile reinforced concrete and developing structural sections using ultra-high performance concrete, fiber reinforced concrete, and textile reinforced concrete systems. The presentation also reviews experimental characterization of distributed cracking, parametric material models, analytical load-deflection solutions, experimental verification, and conclusions.
IRJET- Retrofitting of Reinforced Concrete Beam using Carbon Fiber Reinforced...IRJET Journal
This document summarizes an experiment that tested the flexural behavior of reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP) fabric. Four beams were cast and cured for 28 days. One beam was used as a control, while the other three were preloaded to induce initial cracking before being retrofitted with CFRP fabric. The CFRP strengthened the beams and increased their ultimate load capacity. The experiment investigated the effect of the CFRP fabric and its orientation on the beams' load capacity and failure mode.
This document discusses research on the mechanical properties of unidirectional polypropylene fiber cement composites. The research aims to study the properties of hydrophilic micro PP fibers compared to existing macro fiber technology in developing structural members. Tension and flexural tests on laminate systems with continuous fibers show that both macro and micro PP fibers increase strength and toughness with higher fiber volumes. Digital image correlation analysis indicates fibers promote distributed cracking and strain hardening behavior through mechanisms like crack bridging and pullout. The continuous fiber composites show potential for thin slab applications if design standards consider their strain hardening properties.
Wollastonite is a naturally occurring calcium silicate mineral that has potential as a micro-reinforcement in cementitious materials. The presentation evaluated four grades of wollastonite fibers as a partial replacement for cement in mortar and paste mixes. Testing showed that wollastonite improves mechanical properties by reinforcing the brittle matrix at the micro-level. Smaller wollastonite fibers blended more efficiently with the matrix and provided greater improvements in strength and fracture toughness compared to coarser fibers. The addition of wollastonite reduced early-age plastic shrinkage cracking and improved long-term flexural strength, toughness, and compressive strength up to 60%, 140%, and 30% respectively. Hybrid fiber reinforcement
"Reliability assessment of braided FRP reinforcement for concrete structures"...TRUSS ITN
Abstract: In recent years the long term durability of reinforced concrete structures has become a major concern. The effect of harsh loading conditions and aggressive environmental factors can lead to corrosion of reinforcing steel in civil engineering applications. This in turn leads to undesired repairs, additional costs and shorter service lives. Advanced composite materials, such as Basalt Fibre Reinforced Polymer (BFRP), have the capacity to significantly address this problem. These materials have enhanced physical properties such as higher mechanical and corrosion resistance, and have the potential to replace traditional steel rebars as tension reinforcement in concrete. There are however limitations that prevent their use on a larger scale, and lack of ductility is the most significant. Braiding techniques could provide the required performance benefits related to the additional ductility and flexibility needed, as well as enhancing the bond between FRP and concrete. If this is achieved, it has the potential to prevent a brittle failure and successfully meet strength, reliability and cost demands. This study focuses on the basics of materials characterization and reliability analysis of internal BFRP reinforcement for concrete structures towards design optimization for structural reliability over their service life.
Structural Engineering Properties of Fibre Reinforced Concrete Based On Recyc...IJERA Editor
Glass fibre reinforced plastics (GFRP) based on resin recovered from recycling plastic waste has been shown to possess mechanical properties satisfying normative requirements. This paper investigates the flexural behavior of concrete beams reinforced with GFRP produced from resin recovered from recycled plastic wastes. A total of fifteen of beams of sizes 150 ×150 ×900mm and 100 × 100 × 500mm reinforced with GFRP made from recycled glass fibre reinforced polymer was tested. The flexural test results yielded lower ultimate load, lower stiffness and larger deflections at the same load when compared with the control steel reinforced beam. However, the ultimate flexural strength of beams, reinforced with GFRP from recycled resin was at least four times higher than that of the control unreinforced beam. This is in agreement, quantitatively and qualitatively, with the trend of these parameters in GFRP reinforced concrete based on virgin resins. The results therefore confirm the applicability for structural uses with the accompanying benefits of wealth creation, value addition and environmental sustainability.
A comparative study between traditional method and mix design with industrial...Premier Publishers
Generally bituminous pavements face problems like cracks, rutting, depression and corrugation during it’s period of service. In this paper, we attempted various method of experiments both in traditional and mix design with bi products and therefore a comparative study has been made for extracting the finest results for the betterment of highway pavements (flexible) and for that our key elements were fly ash, geo-polymer and pieces of waste conveyer belt, added to bitumen for increasing the strength and overall capacity of pavements. Fly ash added to bitumen in the penetration test has shown improvement of 52 mm which was 40mm traditionally. Whereas, geo polymer and bitumen give the result of 74mm penetration. Ductility test with fly ash showed 37.23cm, very rigid. But geo-polymer and bitumen gave the result of 75.77cm. For increasing the bearing capacity of base soil we added pieces of waste conveyer belts and CBR value has shown the increment of 35% from 30%. So, those results convey that, the waste materials and bi products have enough quality to increase the strength and flexibility of pavements which will further help to the construction workers and engineers for maintaining and repairing flexible pavements which last long.
Comparative Analysis of Composite Materials based on Stress and Vibration by ...IRJET Journal
This document summarizes research on comparing the stress and vibration characteristics of different composite materials through experimental analysis. Specifically, it analyzes the natural frequency and mode shapes of cantilever beams made of steel, E-glass epoxy, and fiber reinforced plastic (FRP) composites using a fast Fourier transformer analyzer and stress testing with a universal testing machine. The study found that E-glass epoxy composite material performed better than steel and FRP materials with higher natural frequencies and was better able to withstand stresses. The behavior of vibrating structures obtained through experimental modal analysis can be used to validate results from finite element modeling of mode shapes.
IRJET- Study on Self Compacting Concrete using Recycled Aggregate as Part...IRJET Journal
This document presents the results of a study on the effects of adding marble dust and steel fibers to concrete. The study investigated the impact on compressive strength, split tensile strength, and flexural strength. Concrete cubes, cylinders, and beams were cast with varying percentages of marble dust replacing cement and steel fibers added. Testing at 28 days showed that replacing 10% of cement with marble dust and adding up to 1% steel fibers increased the compressive, split tensile, and flexural strengths of the concrete compared to normal concrete without additions. The optimal mix was found to be 10% marble dust and 1% steel fibers.
IRJET- Flexural Behaviour of RCC Beam with Partially Replaced Concrete be...IRJET Journal
This document summarizes an experimental study that investigated the flexural behavior of reinforced concrete beams with partially replaced concrete below the neutral axis. Six groups of beams were tested: 1) control beams made of M-25 concrete, 2) beams with M-25 concrete above the neutral axis and M-20 concrete below, 3) beams with M-25 above and M-15 below, 4) beams with M-25 concrete and a hollow pipe below the neutral axis, 5) beams with M-25/M-20 concrete and a hollow pipe below, and 6) beams with M-25/M-15 concrete and a hollow pipe below. The study found that beams with lower grade concrete or a hollow section below the
IRJET- Strengthening of Reinforced Concrete Beams using Fiber Reinforced Poly...IRJET Journal
This document summarizes research on strengthening reinforced concrete beams with fiber reinforced polymer composites. It reviews 11 previous studies that investigated using glass or carbon fiber reinforced polymer sheets to strengthen beams against flexural or shear failure. The document then describes an experimental study involving two sets of beams: one set weakened in flexure and strengthened with glass fiber sheets, and one set weakened in shear and strengthened with glass fiber sheets. The effects of fiber orientation and layering were examined. Beams strengthened in flexure had increased load capacity but were prone to shear-flexure failure. Beams strengthened in shear exhibited flexure failure with more warning. Bonding of fibers was intact until beam failure. Analytical models underpredicted load capacity compared to experiments
IRJET- Study of Square Concrete Column Behavior Confined with CFRP SheetsIRJET Journal
This study investigated the behavior of square concrete columns confined with carbon fiber-reinforced polymer (CFRP) sheets. 30 column specimens were tested including plain concrete, reinforced concrete, and CFRP-confined columns of different concrete grades (M20, M30, M40) and CFRP layer configurations (1-3 layers). Results showed that:
1) Load capacity increased up to two CFRP layers then decreased for three layers while ductility continuously increased up to three layers.
2) Toughness index increased with concrete grade and number of CFRP layers.
3) Stiffness increased for CFRP-confined columns compared to plain and reinforced concrete columns.
IRJET- Strengthening of RC and FRC Beams with Precast Sifcon Laminates- An Ex...IRJET Journal
This document describes an experimental study that aimed to strengthen reinforced concrete (RC) beams and fibre reinforced concrete (FRC) beams using precast slurry infiltrated fibre concrete (SIFCON) laminates. SIFCON laminates were directly bonded to the bottom face and side faces of beams using epoxy adhesive. RC and FRC beams without strengthening were used as control specimens. The strengthened beams showed significant increases in first crack load and formation of finer cracks compared to control beams. Results indicate that strengthening RC and FRC beams with SIFCON laminates can effectively enhance load carrying capacity.
IRJET-Experimental Study on Concrete Properties using Pet in Tension ZoneIRJET Journal
This document describes an experimental study on using PET fibers in the tension zone of concrete beams to improve their ductile properties. Several concrete beams were cast - a control beam without fibers and beams with PET mesh made of continuous fibers placed in the tension zone during casting. Tests were performed to analyze the flexural strength and crack width properties. The results showed that the beams with PET fiber mesh in the tension zone had slightly higher flexural strength and wider crack widths compared to the control beam without fibers. As more layers of PET mesh were added, the crack width decreased. Therefore, the PET fiber mesh was found to improve the ductile properties of concrete beams.
IRJET- Soil Stabilization by using Jute FibreIRJET Journal
This document summarizes a study on soil stabilization using jute fibre. The researchers mixed jute fibre at varying percentages between 0.25-1% with fine sand to improve its engineering properties. Tests found that adding jute fibre significantly increased the unconfined compressive strength and California bearing ratio of the soil. Specifically, a 1% addition of jute fibre maximized the strength properties of the soil-jute mixture. The study concluded that mixing jute fibre improves the load bearing capacity of soils, making them more suitable for construction applications.
Composite materials are becoming popular in various industries such as aerospace industry, automotive industry, and wind energy. We have seen global surge in the demand of composites particularly carbon fiber reinforced plastic (CFRP) composites, which has led to huge volume of manufacturing and end-of-life waste material. The most common way for disposing of composite waste is through landfills. However, current, and impending legislations such as Directive on Landfill of Waste, have limited the amount of composite waste permitted for landfilling. Also, for making of pristine carbon fiber requires high amount of energy if we compare it to other materials like steel and aluminium. This generates a need to find out a way to recycle and reuse the waste material or the end-of-life material in different sector applications. This study mainly focuses on the strength comparison of pristine(virgin) CFRP with recycled CFRP and conducting finite element analysis on some parts made from virgin and recycled material. Also, details about mechanical recycling, cost estimation for producing virgin material as well as for recycling the material must be taken into account.
IRJET- Evaluation of Subgrade Stabilized with Natural Geo-Textiles by Deflect...IRJET Journal
This document summarizes a study that evaluated the use of natural geo-textiles like coir and jute fibers to stabilize subgrade soil in a semi-field test track. A 15m long test track was constructed with 5 sections - a control soil section and 4 sections reinforced with coir geo-textile, jute geo-textile, coir fibers, and jute fibers. Dual wheel load tests were performed on the subgrade and granular sub-base layers to measure deflections under increasing loads. The deflection data was analyzed using empirical and theoretical approaches. Results showed that incorporating stabilizing materials at the subgrade level improved strength parameters and overall pavement performance compared to the unstabilized control section.
IRJET - Study on Workability and Compressive Strength of Concrete Blended...IRJET Journal
This document summarizes a study on the workability and compressive strength of concrete blended with steel fibers. Steel fibers were added to concrete mixes in volumes of 0%, 0.5%, 1%, 1.5%, and 2%. Testing found that as fiber content increased, workability decreased, requiring the addition of plasticizers. Compressive strength generally increased with higher fiber content up to 2%, with a maximum strength increase of 27.67% observed for 2% fiber volume with plasticizer addition. The study concluded that steel fiber reinforcement improved compressive strength but reduced workability, and plasticizers helped offset the loss of workability.
EXPERIMENTAL STUDY OF RETROFITTED RC BEAMS USING FRPAM Publications
In order to improve the performance of reinforced cement concrete structure (RCC) it is better to repair or upgrade the structure by retrofitting. Retrofitting is one of the best options to make an existing inadequate building safe against future probable earthquake or other environmental forces. Retrofitting is the modification of existing structure to make them more resistance to seismic action, motion of ground and failure of soil due to earthquake or other natural calamities such as tornadoes cyclones and winds with high velocity caused by thunder storm, snow fall, hailstorms, etc. The study investigate the improvements in the structural behaviour of the RC beams retrofitted with various types of FRP such as glass fibres, coir fibres, banana fibres, jute fibres and cotton fibres. The experimental programme includes strengthening and flexural strength test of 18 simply supported RC beams of 500x100x100 mm. The test results showed an increase in ultimate load for the retrofitted beam when compared to normal control beam and corresponding increase in the value of modulus of rupture. The retrofitted beams with glass fibre using epoxy as binder having 47.32% more strength than the control beams. Area under load-deflection curve gives toughness. Toughness value is found to be more in RC beams retrofitted with banana fibre.
This document summarizes research on the tensile and flexural behavior of ultra-high performance concrete (UHPC) under high-speed and impact loads. High-speed testing systems were used to apply tensile and flexural impact loads to UHPC specimens. Digital image correlation was utilized to analyze crack propagation and strain fields. The research found that UHPC achieved tensile strengths over 20 MPa and flexural strengths exceeding 25 MPa. An analytical model was also developed that could predict UHPC's flexural impact response based on parameters like residual strength, localization zone size, and tensile and flexural properties.
Behaviour of Ultra - High Performance Glass Concrete Confined with High Carbo...IRJET Journal
This document presents research on the behavior of ultra-high performance glass concrete confined with high carbon steel wire under axial loading. Five concrete cylinders were tested with varying confinement pressure achieved by changing the winding spacing of high carbon steel wire. The results showed that winding the steel wire significantly enhanced the strength and provided greater ductility compared to unconfined specimens. The study found that high carbon steel wire confinement is an effective and efficient method for jacketing concrete that can greatly improve its strength and deformation capacity.
This document describes a multi-scale modeling study of the influence of porosity on the mechanical properties and fracture of Gilsocarbon graphite. The study used micro-cantilever tests to determine material properties at the microscale and developed a multi-scale model to predict properties at larger scales. The model accounted for the graphite's microstructure of matrix, filler particles, and pores. Simulation results showed decreasing mechanical properties with increasing porosity and that pore size distribution and particle-matrix interface strength significantly affect properties and crack propagation.
GRP structural lining systems can be used to rehabilitate large diameter, non-circular culverts and sewers. They were developed in the UK in the 1970s-80s through extensive research by the Water Research Centre and Channeline to determine appropriate designs and testing methods. The document discusses the history and testing done, as well as the structural design philosophy and methods. It also covers manufacturing, quality control, jointing systems, and the product range of GRP lining options.
THIS IS THE PRESENTATION ON THE INTERNSHIP WORK CARRIED OUT BY ME FOR A PERIOD OF 1 MONTH AT VRISHABHAVATI VALLEY, MYSORE ROAD; UNDER THE GUIDANCE OF SUEZ INDIA Pvt.Ltd
This document discusses research on the mechanical properties of unidirectional polypropylene fiber cement composites. The research aims to study the properties of hydrophilic micro PP fibers compared to existing macro fiber technology in developing structural members. Tension and flexural tests on laminate systems with continuous fibers show that both macro and micro PP fibers increase strength and toughness with higher fiber volumes. Digital image correlation analysis indicates fibers promote distributed cracking and strain hardening behavior through mechanisms like crack bridging and pullout. The continuous fiber composites show potential for thin slab applications if design standards consider their strain hardening properties.
Wollastonite is a naturally occurring calcium silicate mineral that has potential as a micro-reinforcement in cementitious materials. The presentation evaluated four grades of wollastonite fibers as a partial replacement for cement in mortar and paste mixes. Testing showed that wollastonite improves mechanical properties by reinforcing the brittle matrix at the micro-level. Smaller wollastonite fibers blended more efficiently with the matrix and provided greater improvements in strength and fracture toughness compared to coarser fibers. The addition of wollastonite reduced early-age plastic shrinkage cracking and improved long-term flexural strength, toughness, and compressive strength up to 60%, 140%, and 30% respectively. Hybrid fiber reinforcement
"Reliability assessment of braided FRP reinforcement for concrete structures"...TRUSS ITN
Abstract: In recent years the long term durability of reinforced concrete structures has become a major concern. The effect of harsh loading conditions and aggressive environmental factors can lead to corrosion of reinforcing steel in civil engineering applications. This in turn leads to undesired repairs, additional costs and shorter service lives. Advanced composite materials, such as Basalt Fibre Reinforced Polymer (BFRP), have the capacity to significantly address this problem. These materials have enhanced physical properties such as higher mechanical and corrosion resistance, and have the potential to replace traditional steel rebars as tension reinforcement in concrete. There are however limitations that prevent their use on a larger scale, and lack of ductility is the most significant. Braiding techniques could provide the required performance benefits related to the additional ductility and flexibility needed, as well as enhancing the bond between FRP and concrete. If this is achieved, it has the potential to prevent a brittle failure and successfully meet strength, reliability and cost demands. This study focuses on the basics of materials characterization and reliability analysis of internal BFRP reinforcement for concrete structures towards design optimization for structural reliability over their service life.
Structural Engineering Properties of Fibre Reinforced Concrete Based On Recyc...IJERA Editor
Glass fibre reinforced plastics (GFRP) based on resin recovered from recycling plastic waste has been shown to possess mechanical properties satisfying normative requirements. This paper investigates the flexural behavior of concrete beams reinforced with GFRP produced from resin recovered from recycled plastic wastes. A total of fifteen of beams of sizes 150 ×150 ×900mm and 100 × 100 × 500mm reinforced with GFRP made from recycled glass fibre reinforced polymer was tested. The flexural test results yielded lower ultimate load, lower stiffness and larger deflections at the same load when compared with the control steel reinforced beam. However, the ultimate flexural strength of beams, reinforced with GFRP from recycled resin was at least four times higher than that of the control unreinforced beam. This is in agreement, quantitatively and qualitatively, with the trend of these parameters in GFRP reinforced concrete based on virgin resins. The results therefore confirm the applicability for structural uses with the accompanying benefits of wealth creation, value addition and environmental sustainability.
A comparative study between traditional method and mix design with industrial...Premier Publishers
Generally bituminous pavements face problems like cracks, rutting, depression and corrugation during it’s period of service. In this paper, we attempted various method of experiments both in traditional and mix design with bi products and therefore a comparative study has been made for extracting the finest results for the betterment of highway pavements (flexible) and for that our key elements were fly ash, geo-polymer and pieces of waste conveyer belt, added to bitumen for increasing the strength and overall capacity of pavements. Fly ash added to bitumen in the penetration test has shown improvement of 52 mm which was 40mm traditionally. Whereas, geo polymer and bitumen give the result of 74mm penetration. Ductility test with fly ash showed 37.23cm, very rigid. But geo-polymer and bitumen gave the result of 75.77cm. For increasing the bearing capacity of base soil we added pieces of waste conveyer belts and CBR value has shown the increment of 35% from 30%. So, those results convey that, the waste materials and bi products have enough quality to increase the strength and flexibility of pavements which will further help to the construction workers and engineers for maintaining and repairing flexible pavements which last long.
Comparative Analysis of Composite Materials based on Stress and Vibration by ...IRJET Journal
This document summarizes research on comparing the stress and vibration characteristics of different composite materials through experimental analysis. Specifically, it analyzes the natural frequency and mode shapes of cantilever beams made of steel, E-glass epoxy, and fiber reinforced plastic (FRP) composites using a fast Fourier transformer analyzer and stress testing with a universal testing machine. The study found that E-glass epoxy composite material performed better than steel and FRP materials with higher natural frequencies and was better able to withstand stresses. The behavior of vibrating structures obtained through experimental modal analysis can be used to validate results from finite element modeling of mode shapes.
IRJET- Study on Self Compacting Concrete using Recycled Aggregate as Part...IRJET Journal
This document presents the results of a study on the effects of adding marble dust and steel fibers to concrete. The study investigated the impact on compressive strength, split tensile strength, and flexural strength. Concrete cubes, cylinders, and beams were cast with varying percentages of marble dust replacing cement and steel fibers added. Testing at 28 days showed that replacing 10% of cement with marble dust and adding up to 1% steel fibers increased the compressive, split tensile, and flexural strengths of the concrete compared to normal concrete without additions. The optimal mix was found to be 10% marble dust and 1% steel fibers.
IRJET- Flexural Behaviour of RCC Beam with Partially Replaced Concrete be...IRJET Journal
This document summarizes an experimental study that investigated the flexural behavior of reinforced concrete beams with partially replaced concrete below the neutral axis. Six groups of beams were tested: 1) control beams made of M-25 concrete, 2) beams with M-25 concrete above the neutral axis and M-20 concrete below, 3) beams with M-25 above and M-15 below, 4) beams with M-25 concrete and a hollow pipe below the neutral axis, 5) beams with M-25/M-20 concrete and a hollow pipe below, and 6) beams with M-25/M-15 concrete and a hollow pipe below. The study found that beams with lower grade concrete or a hollow section below the
IRJET- Strengthening of Reinforced Concrete Beams using Fiber Reinforced Poly...IRJET Journal
This document summarizes research on strengthening reinforced concrete beams with fiber reinforced polymer composites. It reviews 11 previous studies that investigated using glass or carbon fiber reinforced polymer sheets to strengthen beams against flexural or shear failure. The document then describes an experimental study involving two sets of beams: one set weakened in flexure and strengthened with glass fiber sheets, and one set weakened in shear and strengthened with glass fiber sheets. The effects of fiber orientation and layering were examined. Beams strengthened in flexure had increased load capacity but were prone to shear-flexure failure. Beams strengthened in shear exhibited flexure failure with more warning. Bonding of fibers was intact until beam failure. Analytical models underpredicted load capacity compared to experiments
IRJET- Study of Square Concrete Column Behavior Confined with CFRP SheetsIRJET Journal
This study investigated the behavior of square concrete columns confined with carbon fiber-reinforced polymer (CFRP) sheets. 30 column specimens were tested including plain concrete, reinforced concrete, and CFRP-confined columns of different concrete grades (M20, M30, M40) and CFRP layer configurations (1-3 layers). Results showed that:
1) Load capacity increased up to two CFRP layers then decreased for three layers while ductility continuously increased up to three layers.
2) Toughness index increased with concrete grade and number of CFRP layers.
3) Stiffness increased for CFRP-confined columns compared to plain and reinforced concrete columns.
IRJET- Strengthening of RC and FRC Beams with Precast Sifcon Laminates- An Ex...IRJET Journal
This document describes an experimental study that aimed to strengthen reinforced concrete (RC) beams and fibre reinforced concrete (FRC) beams using precast slurry infiltrated fibre concrete (SIFCON) laminates. SIFCON laminates were directly bonded to the bottom face and side faces of beams using epoxy adhesive. RC and FRC beams without strengthening were used as control specimens. The strengthened beams showed significant increases in first crack load and formation of finer cracks compared to control beams. Results indicate that strengthening RC and FRC beams with SIFCON laminates can effectively enhance load carrying capacity.
IRJET-Experimental Study on Concrete Properties using Pet in Tension ZoneIRJET Journal
This document describes an experimental study on using PET fibers in the tension zone of concrete beams to improve their ductile properties. Several concrete beams were cast - a control beam without fibers and beams with PET mesh made of continuous fibers placed in the tension zone during casting. Tests were performed to analyze the flexural strength and crack width properties. The results showed that the beams with PET fiber mesh in the tension zone had slightly higher flexural strength and wider crack widths compared to the control beam without fibers. As more layers of PET mesh were added, the crack width decreased. Therefore, the PET fiber mesh was found to improve the ductile properties of concrete beams.
IRJET- Soil Stabilization by using Jute FibreIRJET Journal
This document summarizes a study on soil stabilization using jute fibre. The researchers mixed jute fibre at varying percentages between 0.25-1% with fine sand to improve its engineering properties. Tests found that adding jute fibre significantly increased the unconfined compressive strength and California bearing ratio of the soil. Specifically, a 1% addition of jute fibre maximized the strength properties of the soil-jute mixture. The study concluded that mixing jute fibre improves the load bearing capacity of soils, making them more suitable for construction applications.
Composite materials are becoming popular in various industries such as aerospace industry, automotive industry, and wind energy. We have seen global surge in the demand of composites particularly carbon fiber reinforced plastic (CFRP) composites, which has led to huge volume of manufacturing and end-of-life waste material. The most common way for disposing of composite waste is through landfills. However, current, and impending legislations such as Directive on Landfill of Waste, have limited the amount of composite waste permitted for landfilling. Also, for making of pristine carbon fiber requires high amount of energy if we compare it to other materials like steel and aluminium. This generates a need to find out a way to recycle and reuse the waste material or the end-of-life material in different sector applications. This study mainly focuses on the strength comparison of pristine(virgin) CFRP with recycled CFRP and conducting finite element analysis on some parts made from virgin and recycled material. Also, details about mechanical recycling, cost estimation for producing virgin material as well as for recycling the material must be taken into account.
IRJET- Evaluation of Subgrade Stabilized with Natural Geo-Textiles by Deflect...IRJET Journal
This document summarizes a study that evaluated the use of natural geo-textiles like coir and jute fibers to stabilize subgrade soil in a semi-field test track. A 15m long test track was constructed with 5 sections - a control soil section and 4 sections reinforced with coir geo-textile, jute geo-textile, coir fibers, and jute fibers. Dual wheel load tests were performed on the subgrade and granular sub-base layers to measure deflections under increasing loads. The deflection data was analyzed using empirical and theoretical approaches. Results showed that incorporating stabilizing materials at the subgrade level improved strength parameters and overall pavement performance compared to the unstabilized control section.
IRJET - Study on Workability and Compressive Strength of Concrete Blended...IRJET Journal
This document summarizes a study on the workability and compressive strength of concrete blended with steel fibers. Steel fibers were added to concrete mixes in volumes of 0%, 0.5%, 1%, 1.5%, and 2%. Testing found that as fiber content increased, workability decreased, requiring the addition of plasticizers. Compressive strength generally increased with higher fiber content up to 2%, with a maximum strength increase of 27.67% observed for 2% fiber volume with plasticizer addition. The study concluded that steel fiber reinforcement improved compressive strength but reduced workability, and plasticizers helped offset the loss of workability.
EXPERIMENTAL STUDY OF RETROFITTED RC BEAMS USING FRPAM Publications
In order to improve the performance of reinforced cement concrete structure (RCC) it is better to repair or upgrade the structure by retrofitting. Retrofitting is one of the best options to make an existing inadequate building safe against future probable earthquake or other environmental forces. Retrofitting is the modification of existing structure to make them more resistance to seismic action, motion of ground and failure of soil due to earthquake or other natural calamities such as tornadoes cyclones and winds with high velocity caused by thunder storm, snow fall, hailstorms, etc. The study investigate the improvements in the structural behaviour of the RC beams retrofitted with various types of FRP such as glass fibres, coir fibres, banana fibres, jute fibres and cotton fibres. The experimental programme includes strengthening and flexural strength test of 18 simply supported RC beams of 500x100x100 mm. The test results showed an increase in ultimate load for the retrofitted beam when compared to normal control beam and corresponding increase in the value of modulus of rupture. The retrofitted beams with glass fibre using epoxy as binder having 47.32% more strength than the control beams. Area under load-deflection curve gives toughness. Toughness value is found to be more in RC beams retrofitted with banana fibre.
This document summarizes research on the tensile and flexural behavior of ultra-high performance concrete (UHPC) under high-speed and impact loads. High-speed testing systems were used to apply tensile and flexural impact loads to UHPC specimens. Digital image correlation was utilized to analyze crack propagation and strain fields. The research found that UHPC achieved tensile strengths over 20 MPa and flexural strengths exceeding 25 MPa. An analytical model was also developed that could predict UHPC's flexural impact response based on parameters like residual strength, localization zone size, and tensile and flexural properties.
Behaviour of Ultra - High Performance Glass Concrete Confined with High Carbo...IRJET Journal
This document presents research on the behavior of ultra-high performance glass concrete confined with high carbon steel wire under axial loading. Five concrete cylinders were tested with varying confinement pressure achieved by changing the winding spacing of high carbon steel wire. The results showed that winding the steel wire significantly enhanced the strength and provided greater ductility compared to unconfined specimens. The study found that high carbon steel wire confinement is an effective and efficient method for jacketing concrete that can greatly improve its strength and deformation capacity.
This document describes a multi-scale modeling study of the influence of porosity on the mechanical properties and fracture of Gilsocarbon graphite. The study used micro-cantilever tests to determine material properties at the microscale and developed a multi-scale model to predict properties at larger scales. The model accounted for the graphite's microstructure of matrix, filler particles, and pores. Simulation results showed decreasing mechanical properties with increasing porosity and that pore size distribution and particle-matrix interface strength significantly affect properties and crack propagation.
GRP structural lining systems can be used to rehabilitate large diameter, non-circular culverts and sewers. They were developed in the UK in the 1970s-80s through extensive research by the Water Research Centre and Channeline to determine appropriate designs and testing methods. The document discusses the history and testing done, as well as the structural design philosophy and methods. It also covers manufacturing, quality control, jointing systems, and the product range of GRP lining options.
THIS IS THE PRESENTATION ON THE INTERNSHIP WORK CARRIED OUT BY ME FOR A PERIOD OF 1 MONTH AT VRISHABHAVATI VALLEY, MYSORE ROAD; UNDER THE GUIDANCE OF SUEZ INDIA Pvt.Ltd
This document provides information about Concrete Cloth, a flexible cement-impregnated fabric that hardens when hydrated to form a thin, durable concrete layer. It can be used for applications like secondary containment, erosion control, and lining channels, ditches, slopes, and culverts. The document discusses Concrete Cloth's composition, installation process, abrasion resistance, applications, and case studies. Installation typically involves rolling out the fabric, hydrating it with water, and allowing it to cure into a hardened surface within 24 hours.
Ferrocement is a thin-walled construction material made of cement mortar reinforced with wire mesh. The document reports on an experimental investigation that tested various steel wire mesh configurations for constructing ferrocement water tanks. Specimens were cast and tested to determine material properties and panel strength. Compression testing of cement cubes showed increasing strength from 19 MPa at 3 days to 32 MPa at 28 days. Flexural testing found that a sandwich panel with double wire mesh layers had the highest cracking and ultimate loads, demonstrating ferrocement's potential for durable, low-cost water tanks.
Shortcreting has proved to be the best method for construction of curved surfaces. Domes are now much easier to construct with the advent of shotcrete technology. Tunnel linings are also becoming easy with this technology. Not only are these but there a wide range of applications where this technology has been a leading one. This technical paper includes the concept of shotcrete and how it differs from conventional concrete. It also enumerates the different types of process involved in shotcreting i.e. dry mix process and wet mix process. Advantages of shotcrete and its applications in various fields like tunneling, canals, buildings etc. are specified in detail. This paper presents an overview of shotcreting technology along with its applications.
DEFINITION OF SHOTCRETE:-
Shotcrete is a mortar or high performance concrete conveyed through a hose and pneumatically projected at high velocity onto a backing surface. It is the force of this spraying action that leads to compaction of the concrete or mortar which then forms layers of concrete to the required thickness. Shotcreting has been an acceptable way of placing cementitious material in a variety of applications.
Usually patented polypropylene fibers are included in the shotcrete which increases the cohesive nature of the shotcrete through mechanically binding the cementitious materials together. This mechanism reduces the rebound waste that occurs through the shotcreting process and these fibers also resist plastic shrinkage and cracking through their ability to enhance the early stage tensile strength of concrete.
Shotcrete also gives better surface finishes and reduces surface tearing on non- linear sections. Cementitious material containing the poly propylene fibers resist cycles of freezing and thawing and also reduces the chances of water and chemical penetrations.
This document discusses high performance concrete (HPC) and ultra-high performance concrete (UHPC), including their mix designs, ingredients, characteristics, advantages, disadvantages, applications, and specific structures where HPC has been used. HPC is designed to achieve higher strength, durability, and workability than conventional concrete through the use of additives like fly ash, slag, and superplasticizers. It has been used in tunnels, bridges, tall buildings, and other structures where high strength and durability are required.
Paste Viscosity!
Attained by one of three means:
High cement content
High content of Fly Ash, Silica Fume etc
Use of Viscosity Modifying Admixture
Also low water content using HRWR
Carbon Fiber (FRP) used for structural strengthening. It’s 5 to 10 times stronger than steel, light weight and corrosion resistant. The ASME PCC-2 code new standard includes carbon fiber as an acceptable repair and strengthen system for steel pipes.
This document provides an overview of shotcrete technology. It defines shotcrete as cement, sand and fine aggregate concretes applied pneumatically under high velocity. Shotcrete can be classified as dry process or wet process based on how the materials are mixed and delivered. Some key advantages of shotcrete include its ability to form irregular surfaces and provide reinforcement. Shotcrete has various applications in construction, tunneling and retaining walls. It provides a strong, durable concrete material when applied correctly.
This document provides an overview of a seminar project on self-compacting concrete. It discusses the introduction and development of self-compacting concrete, including its advantages over traditional vibrated concrete. The objectives, materials, mix proportions, and testing methodology for the project are outlined. Key tests for fresh concrete properties include slump flow, V-funnel, L-box, and U-box tests. The literature review covers research on using fly ash and metakaolin as cement replacements in self-compacting concrete. Applications of self-compacting concrete in large construction projects are also mentioned.
UHPFRC-Gaps in Design & Construction Guidelines by Shri Aditya Sharma.pdfSriRam101316
Ultra-high performance fiber-reinforced concrete (UHPFRC) has several advantages over conventional concrete including very high compressive and tensile strengths. However, there are still gaps that limit its widespread use. Key gaps include a lack of uniform standards for mechanical properties testing and mix design. Existing design guidelines are also specific to certain countries and do not comprehensively address material standards, testing methods, structural design codes, construction procedures, durability requirements, and service life prediction. Additional challenges include the need for specialized equipment and methods to address UHPFRC's low water-to-binder ratio, fiber orientation effects, and high shrinkage strains.
Facades applications using LATICRETE materialsKALIM SYED
This document provides an overview and comparison of different systems for installing tile and stone facades vertically, including thin-bed, leveling bed plus thin-bed, mechanical anchor, and chemical anchor (epoxy spot bonding) systems. It discusses the benefits of each, including design flexibility, cost savings, time savings, and ability to accommodate variations in substrates. Examples of installations using different systems are shown. Cost comparisons show chemical anchors and thin-bed methods tend to be most cost-effective. Limitations of each system are also outlined.
Ceb 706 design of reinforeced and presressed concrete updated!vishwaleenram
This document discusses prestressed concrete design. It begins with an introduction to prestressed concrete as a widely used structural material. It then covers:
1. The history of prestressed concrete in Fiji, including notable structures built with it such as the Reserve Bank of Fiji and bridges.
2. The advantages of prestressed concrete over reinforced concrete, such as increased strength, reduced cracking, and longer spans. It also discusses disadvantages like higher production costs.
3. A site visit and interview conducted at Humes Concrete to learn about their products, casting procedures, past projects, challenges, and future plans.
This presentation discusses fiber reinforced concrete (FRC) pavements. It provides an overview of pavement problems like joints, different pavement designs including jointed reinforced concrete pavement (JRCP) and continuously reinforced concrete pavement (CRCP), and fiber options at different dosages. It summarizes research conducted by the Louisiana Transportation Research Center (LTRC) evaluating fatigue and toughness of FRC. The research found that macro synthetic fibers at dosages of 7.5-10.5 lbs/cu yd provided benefits over steel fibers. It concludes with summaries of several pavement projects using FRC with normal joint spacing.
As part of the keynote panel at the 2014 CTR Symposium, Dr. Jirsa discussed 50 years of significant accomplishments at the Ferguson Structural Engineering Laboratory at the University of Texas at Austin.
The document discusses several infrastructure projects in the UK involving bridge and retaining wall design. It provides details on the structural elements designed, software used, design codes followed, and roles and responsibilities on each project. The projects included bridge assessments, refurbishments, and new designs incorporating concrete, steel, timber and prestressed structures. Design activities involved load calculations, 3D modeling, temporary works planning and site supervision.
Utilization of polymer fiber reinforced concrete pavementHARSHIL PATEL
The document discusses the utilization of polymer fiber reinforced concrete for pavement applications. It begins with an introduction to traditional bituminous pavements and describes how polymer fiber reinforced concrete (PFRC) is a more sustainable alternative. It then provides details on the components of PFRC, including the concrete mix and various polymer fibers that can be used. The document outlines the design and construction process for PFRC pavements. It reviews literature on fiber reinforced polymers and concludes that PFRC requires specific design but can reduce maintenance costs while providing a more durable pavement compared to traditional materials.
Pavement preservation using new lithium densifier wear resistant surface hardener for new construction and for extension of service life in concrete pavements.
The document discusses fiber reinforced concrete (FRC) and the role of ACI committee 544. It provides an overview of FRC properties and applications. It also outlines challenges to wider acceptance of FRC and activities of ACI 544 to address issues like testing standards and design guidelines. The presentation aims to have an open discussion on ways for ACI 544 and fiber industry groups like FRCA to better collaborate to advance FRC technology and applications.
This document discusses the design of precast reinforced concrete structures including precast panels, cast in place water tanks, and fiber reinforced concrete slabs. It outlines the design, analysis, testing, and modeling of these structures. Precast panels are made of concrete and rebar on site and assembled using bolts and epoxy. Finite element analysis is used to model water tanks under lateral loads. Round panel and full-scale fiber reinforced concrete slab tests are conducted and modeled to evaluate post-crack tensile capacity.
This document discusses analytical procedures for modeling strain hardening cement-based composite (SHCC) flexural members. It presents:
1) Parametric material models for SHCC to define tensile and compressive stress-strain relationships.
2) Derivation of moment-curvature relationships for SHCC beams through cross-sectional analysis and stress-strain diagrams.
3) Analytical solutions for deflection of one-dimensional and two-dimensional SHCC members under different loading conditions using curvature distributions derived from moment-curvature analysis.
4) Experimental verification of the analytical modeling approach and design recommendations for SHCC flexural members.
High speed tensile testing of textile composites 2aAsuSSEBENA
This document summarizes a study on the dynamic tensile testing of fabric-cement composites. Three types of fabric-cement composites were tested under high strain rates: AR-glass fabric composite, PE fabric composite, and carbon fiber composite. The testing found that carbon fiber composite exhibited the highest strength and stiffness. Differences in tensile behavior were observed between the composites. Multiple cracking was observed in all composites except the PE composite with plain cement matrix. The results demonstrate the reliability of using high-speed tensile testing for cement-based composites.
This document discusses flexural design procedures for UHPC beams and slabs. It presents a simplified bilinear moment-curvature relationship for UHPC and derives closed-form solutions for the load-deflection response of simply supported UHPC beams and panels. Equilibrium-based equations are used to determine the moment and curvature distributions along the beam. Parametric studies examine the effects of varying normalized moment and curvature on the curvature distribution and 2D deflection contour. Experimental verification is discussed.
Design of Hybrid Steel Fibre Reinforced Concrete Beams for Flexure AsuSSEBENA
This document summarizes research on the design of hybrid steel fiber reinforced concrete beams for flexure. It discusses how steel fibers can improve concrete's ductility, toughness, tensile strength and energy absorption. The research models the flexural behavior of these beams using a parametric linear materials model and closed-form solutions to determine moment-curvature responses. It verifies the analytical model against the ACI318 method and compares responses of reinforced concrete and hybrid reinforced concrete beams. Future work aims to develop analytical deflection equations for strain hardening/softening fiber beams and study composite sections using the same modeling approach.
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Rainfall intensity duration frequency curve statistical analysis and modeling...bijceesjournal
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
An improved modulation technique suitable for a three level flying capacitor ...IJECEIAES
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
Use PyCharm for remote debugging of WSL on a Windo cf5c162d672e4e58b4dde5d797...shadow0702a
This document serves as a comprehensive step-by-step guide on how to effectively use PyCharm for remote debugging of the Windows Subsystem for Linux (WSL) on a local Windows machine. It meticulously outlines several critical steps in the process, starting with the crucial task of enabling permissions, followed by the installation and configuration of WSL.
The guide then proceeds to explain how to set up the SSH service within the WSL environment, an integral part of the process. Alongside this, it also provides detailed instructions on how to modify the inbound rules of the Windows firewall to facilitate the process, ensuring that there are no connectivity issues that could potentially hinder the debugging process.
The document further emphasizes on the importance of checking the connection between the Windows and WSL environments, providing instructions on how to ensure that the connection is optimal and ready for remote debugging.
It also offers an in-depth guide on how to configure the WSL interpreter and files within the PyCharm environment. This is essential for ensuring that the debugging process is set up correctly and that the program can be run effectively within the WSL terminal.
Additionally, the document provides guidance on how to set up breakpoints for debugging, a fundamental aspect of the debugging process which allows the developer to stop the execution of their code at certain points and inspect their program at those stages.
Finally, the document concludes by providing a link to a reference blog. This blog offers additional information and guidance on configuring the remote Python interpreter in PyCharm, providing the reader with a well-rounded understanding of the process.
Discover the latest insights on Data Driven Maintenance with our comprehensive webinar presentation. Learn about traditional maintenance challenges, the right approach to utilizing data, and the benefits of adopting a Data Driven Maintenance strategy. Explore real-world examples, industry best practices, and innovative solutions like FMECA and the D3M model. This presentation, led by expert Jules Oudmans, is essential for asset owners looking to optimize their maintenance processes and leverage digital technologies for improved efficiency and performance. Download now to stay ahead in the evolving maintenance landscape.
1. Design Procedures for Fiber Reinforced
Concrete Applications in New and
Repair of hydraulic Structures
Barzin Mobasher, PhD. PE., FACI
School of Sustainable Engineering and the Built Environment
Arizona State University
2018
2. FRC - Background
• high strength and ductile concrete has been made possible by advances in:
particle packing, aggregate gradation , superplasticizers, rheology
increased quality control
Innovative fibers, testing and specification methods
Chemical admixtures low water-to-cementing materials ratio.
• Ductility and crack width control that reduces liquid ingress, significantly
enhancing durability
3. Problem Statement
• How do we use the existing knowledge on concrete material
for better construction procedures and specifications for
implementing the concrete materials?
• How do we capture the economic benefits of FRC in terms of
speed of construction, reduced labor, better quality concrete?
• Cost-effective specification procedures for use in cast in place,
precast, and shotcrete concrete applications.
4. Objectives
• Existing procedures and standards on proportioning FRC mixtures and the
fiber specific characteristics affecting the overall performance.
• Develop typical FRC mixtures with locally available materials
• Recommended Test methods and Specifications for qualification of
mixtures for various applications
• Optimize the Structural and material design procedures based on
performance criteria for strength, ductility, crack width and durability.
• Availability of specifications and testing guidelines for:
– Mechanical: strength, ductility, impact, repair, volume changes and
crack resistance
– Durability: corrosion resistance, resistance to chloride ion ingress and
freeze and thaw, shrinkage, curling, cracking.
5. Introduction
• Concerns for sustainable design of environmental structures is the main driver for
development of new materials and design methods.
• In consideration to traditional design methods, as the cost of raw materials, labor,
and energy have increased, many new alternative designs for fiber reinforced
concrete are increasingly become cost effective.
• Development of new guidelines for concrete materials to address higher strength,
ductility, and stiffness, as well as corrosion protection, serviceability and cracking
potential are addressed.
• Innovative fiber reinforced concrete materials when designed using fundamental
aspects of mechanics and materials science with specific focus on durability offer
efficient and sustainable structural systems.
6. Non-Traditional Water Conservation through Design and
Construction Techniques
• The Pima-Maricopa Irrigation Project is a tribal program operated through
an annual funding agreement with the U.S. Bureau of Reclamation.
• Since January 2010, P-MIP has constructed more than $350M in projects
that total 85.37 miles in length.
• This includes pipeline and open channel canal, with the latter going from a
34-foot bottom (2,000 cfs) down to a 2-foot bottom (15 cfs).
7. specifications and design guides for
sustainable construction systems
• New materials, testing procedures, and applications for fiber reinforced
concrete to address improved ductility-durability measures.
• Application areas include early age properties, shrinkage cracking, and
correlation of ductility with durability.
• Testing, analysis, and design guidelines to obtain material models that can
be directly integrated within structural analysis software. Integration of
material and structural design through the development of analytical
closed-form solutions for design and analysis of beams, slabs, canal lining,
retaining walls, pipes, and buried structures.
• Solutions for sustainable development of infrastructure systems using
blended cements, thermal energy considerations of concrete buildings,
blast, impact, and high ductility required designs such as vehicle impact.
9. SouthSide Canal
• The Southside Canal Project is part of the Pima-Maricopa Irrigation Project that is
extremely important to agriculture in the area.
• Coffman Specialties was awarded $16 Million Canal Contract through the Pima-
Maricopa Irrigation Project (P-MIP)
• More than 145,000 square yards of concrete to line the 8’ deep, 32’ wide canal.
• The Community's ultimate goal is to design and construct a water delivery system
that will potentially include 2,400 miles of canal and pipeline.
10. Santan Canal
• The Santan Canal is part of the Gila River Indian Community's master plan
to deliver 173,000 acre feet of water to farmlands within the Community.
• Scope of the project includes earthwork to construct the canal prism,
concrete lining and thirty-five reinforced concrete structures. In addition,
Granite will construct a reservoir and excavate approximately 344,000
cubic yards of borrow needed to complete the work.
• Granite Construction Company was awarded a $22.0 million contract by
the Gila River Indian Community to construct the final phase of an 8.5-
mile Santan Canal located approximately 40 miles southeast of Phoenix.
12. Tasks
• Criteria for fibers in structural applications
• Criteria for repair of existing structures and canals
• Criteria for fibers in shotcrete
• Development of performance based specifications
• Design opportunities:
– Ductility, durability, crack width, stiffness, cracked section modulus, Shear
– Hybrid approach of combining reinforcement and fibers for sustainability
– Minimum reinforcement requirements.
• Five major documents developed by the ACI 544-D committee
• ACI 544-9R Mechanical testing of FRC
• ACI 544-8R Tensile Design Properties from flexural tests, backcalcuation procedures
• ACI 544-4R Design
• ACI 544-6R Elevated slabs (2015)
• ACI 544-7R Tunnel lining
13. ACI related International Committee Reports
ACI 544.5R-10 “Physical Properties and Durability of Fiber-Reinforced Concrete,”
Report, ACI Committee, p. 31, (2010).
ACI 544.6R-15 Report on Design and Construction of Steel Fiber-Reinforced
Concrete Elevated Slabs (2015)
ACI 544.7R-16 Report on Design and Construction of Fiber-Reinforced Precast
Concrete Tunnel Segments (2016)
ACI 544.8R-16: Report on Indirect Method to Obtain Stress-Strain Response of
Fiber-Reinforced Concrete (FRC), ACI Committee 544 ACI 544.8R (2016)
ACI 544.9R-17: Report on Measuring Mechanical Properties of Hardened Fiber-
Reinforced Concrete, (2017)
https://www.concrete.org/Portals/0/Files/PDF/Previews/544.9R-17_preview.pdf
ACI 544.10R-17: Report on Measuring Properties of Fresh Fiber-Reinforced
Concrete, (2018)
ACI 544-4R ACI 544.4R-18: Report on Structural Design with Fiber-Reinforced
Concrete (2018)
14.
15.
16. FRC Engineering Applications
Ductility, Durability, Sustainability
The type and volume fraction of fibers affect the level of energy absorption
increased energy absorption, fatigue life, impact/explosive loading conditions, and seismic
resistance
Pavements/slabs,Precast components, Shotcrete
17. Shrinkage Induced Transverse Cracking
• Reduce load carrying capacity
• Accelerate deterioration
• Increase maintenance costs
• Reduce service life
• Plastic Shrinkage: Water evaporation at
early age
• Drying Shrinkage: Loss of excessive water
from hardened concrete
18. Joint failure
• Intended to control the cracks
• Presence of joints and corners aggravates
the potential cracking as well as long term
durability
• Joint edge chipping, uplift, and corner
flexural cracks
• Potentially induced due to curling of the slab
• Point load such as truck wheel
19. Use of fibers in joint-free slab
• Crack bridging
• Load transfer
• Distributed fine cracks
• Non-critical crack pattern
20. Hybrid Reinforcement
Alternatives:
1- Conventional Steel Bars
2- Fiber Reinforcement
3- Hybrid Design
Issues with conventional reinforcement
• Significant space, time & labor needed to assemble cages &
place reinforcing bars
• Spalling/Bursting cracks at segment joints/corners because
of no reinforcement at concrete cover
Advantages of fiber reinforcement
• Improved precast production efficiency
• Reduce spalling or bursting cracks of concrete cover at
vulnerable edges and corners
• Crack control, improved serviceability & durability
• High strength, ductility & robustness against unintentional
impact loads
Segments near portal of Alaskan Way Viaduct/SR99 (Dia. 17.5m)– Reinforcement Ratio > 120 kg/m3
(Largest TBM tunnel in the world which is heavily reinforced but large cracks are observable)
21. Excess rebar specified can be replaced using a
hybrid design approach in many applications
• Eliminate a substantial amount of reinforcing bars by using a highly flowable,
steel /polymeric fiber-reinforced concrete
• The fibers are introduced during the concrete mixing process.
22. Canal lining, WWF, or rebar replacement
Fiber Reinforced Concrete Mix
Photo Courtesy: Pima-Maricopa Irrigation
Project, Sacaton, Arizona
Traditional #5 rebar layout
Photo Courtesy: Rick Shelly, Pulice
Construction
24. Tunnel Lining
• Fiber-reinforced concrete can be used in tunnel lining segments.
• Macro steel fibers and macro synthetic fibers are mainly used for this type of application.
• Using fibers can reduce or even eliminate the steel rebar reinforcement which results in
faster and cheaper production.
M. Moccichino et al., 2010 world
tunnel conference, Italy
BEKAERT
25. Structural Design with FRC Materials: testing,
modeling, analysis and Design
Shotcrete applicationsPrecast panels
Design with Strain
Softening materials
26. Analysis of Precast Wall Panels
• Assume continuous wall, pin connection at the
bottom and free at the top
• Lateral water pressure in ultimate and
serviceability limit states
27. Shrinkage as a Volumetric Change
• Drying and plastic shrinkage
(due to water loss by evaporation)
• Autogenous/self-desiccation shrinkage
(due to cement hydration)
– Thermal shrinkage (due to decrease in temperature)
• Carbonation shrinkage
(reaction of hydrated cement w/carbon dioxide)
aggregates paste
Evaporation
cross-section of hydrating cement paste
low degree of
hydration
high degree of
hydration
Solid matter
(hydrates and anhydrous cement)
pore water
empty pore volume
28. Free shrinkage test for hardened
concrete
0 10 20 30
Time (Days)
0
500
1000
1500
2000
2500
3000
FreeShrinkageStrain(microstrain) Control (1)
Control (2)
ARG05 (1)
ARG05 (2)
ARG10 (1)
ARG10 (2)
w/c = 0.45
• Tests are performed
according to ASTM C157
29. 1D Shrinkage Cracking Ring Test AASHTO PP34-99
- Curing: 24 h under plastic sheets
- Relative humidity: 30% ± 1%
- Temperature: 40 ± 1°C
0 2 4 6 8 10 12 14
Drying Time, day
-100
-75
-50
-25
0
25
50
StraininSteel,microstrain
Strain Gage 1
Strain Gage 2
w/c=0.55,
curing time = 1 day
strain gage 2
strain
gage 1
0 2 4 6 8 10
Drying Time, day
-100
-75
-50
-25
0
25
50
StraininSteel,microstrains
Stage 3
Stage 2
Stage 1
Pre-peak region
(elastic loading)
Post-Peak
Cracking
Corresponding to
ultimate tensile strength
Expansion
equilibrium
A typical result of a strain gage
attached to steel ring
30. Image Analysis of 1D Restrained
Shrinkage Cracks
0 5 10 15 20 25 30
Time, Days
0
0.02
0.04
0.06
0.08
CrackWidth,in.
Control
ARG2.5
ARG5.0
ARG7.5
31. Effect of fiber addition on strain in the steel rings
0 2 4 6 8 10 12 14
Drying Time, day
-100
-75
-50
-25
0
25
50
StraininSteel,microstrain
Control
ARG2.5
ARG5.0
ARG7.5
w/c=0.55
curing time = 1 day
1. Extension of time to cracking
2. Post cracking ductility and strain distribution
Average crack width: 1.15 mm
Standard deviation: 0.0787 mm
Average crack width: 0.341 mm
Standard deviation: 0.048 mm
32. Consideration of Residual strength Effect
0 0.03 0.06 0.09 0.12 0.15
CMOD, inch
0
500
1000
1500
2000
2500
3000
Load,lbf
36 hrs - Sample 1
36 hrs - Sample 2
16 hrs - Sample 1
16 hrs - Sample 2
8 hrs - Sample 1
8 hrs - Sample 2
Three Point Bending Test Result
Mix 1
10-12 lbs/yd3 of macro fibers
33. Stress distribution for a cracked material with Strain-Softening
FRC
0 0.01 0.02 0.03 0.04 0.05
Deflection, in
0
200
400
600
800
1000
FlexuralLoad,lb
Experiment
Present Model
L-056 : 9.5 lb/yd3 FibraShield
sample 1
age: 14 days
0 400 800 1200 1600
Stress (psi)
-2
-1
0
1
2
SpecimenDepth,(in)
ARS Method, LE material
ASU Method, Elastic Softening
Stress Distribution
Softening Zone
L056-01
37. Modeling of Failure Mechanisms
Oberseite - ULS Mittellast
S
N
West Ost
Unterseite
S
N
WestOst
Durchgezogen: bis 200 kN
gestrichelt: bis Brucklast
38. Plastic analysis approach
Distributed load on a simply supported square slab.
The work equations are derived as:
Where the resultant NR and rotation θ (from figure 9a)
are:
For the four segments with an NR acting at 1/3 of δmax :
θ θ
q
δmax
L
L/2
L/2
m
m
A A
δ
Yield Line
Square Slab
Simply Supported
int extW W
R( N ) ( M L )
2
2 2 4
R
L L qL
N q ( ) ( )
2 max
L
2
2
4 4
4 3
max max
L
qL
( ) ( ) ( M ) ( L ) ( )
2
24
ult
p
q L
M
39. Analysis, Design and Installation of precast water
tank panels
• Load Case1:
– Self weight + Water pressure
– Moment in short span controls
Load Case2:
– 1.4 Self weight +
1.7 Earth pressure +
1.7 Uniform pressure due to surcharge
– Moment in short span direction SM1
40. Mechanics of Fiber and Textile Reinforced
Cement Composites
• CRC press, 2011
• E-mail: barzin@asu.edu
• http://enpub.fulton.asu.edu/cement/
41. Conclusions
• New technologies and directions are clearly available in our future
progression in Construction industry.
• Use of materials science based and mechanics based approaches to
obtain better ways to characterize, model, analyze, and design.
• Better train, communicate, and follow through
– Design of Materials and Structures for novel construction.
• Address specifications, quality, and long term performance.
• Fiber Reinforced Concrete can be effectively used as a technology
enabler for our alternative energy generation, use and infrastructure
development