This document compares destructive and non-destructive testing techniques for concrete, specifically rebound hammer testing and ultrasonic pulse velocity testing. Twenty-seven concrete cube samples were tested destructively via compression testing at 7, 14, and 28 days to determine compressive strength. The samples were also tested non-destructively using a rebound hammer and ultrasonic pulse velocity method. A higher correlation was found between rebound hammer readings and compressive strength than between ultrasonic pulse velocity and compressive strength. The rebound hammer provided correlation coefficients of 1.63, 2.25, and 2.52 at 7, 14, and 28 days respectively, while ultrasonic pulse velocity provided coefficients of 1.11, 1.05
STRENGTH AND PERMEABILITY STUDIES ON CONCRETE WITH NANO-CEMENTIAEME Publication
Nanotechnology has received the attention of many researchers for its ability to make use of the unique properties of nano-sized materials for obtaining favourable characteristics. The grain size of the nano particles will be in the order of 10-9 m (1-100nm). Materials at nano stage can change the whole properties of the composites to which these nano particles are added. Nano-particles exhibit unique properties that develop a stronger, more durable concrete with favorable characteristics when added to concrete. Addition of nano materials at the time of production of concrete can lead to significant improvements in the strength and life of concrete. One of the active areas of research dealing with cement and concrete is strength and durability of concrete containing nano particles. An attempt has been made to carry out an experimental investigation on strength and permeability of concrete containing nano-cement. Plasma arching, chemical vapor deposition, electro deposition, sol-gel synthesis, high intensity ball milling etc., are some of the methods reported in the literature to synthesize nano level materials. Nano-cement was made by grinding the commercially available 53 grade Portland cement using a high energy ball grinding mill. A scanning electron microscope was used to determine the particle size of the nano-cement produced. Different grades of concrete viz., M20, M30. M40 and M50 were cast. For each grade of concrete, 10%, 20%, 30%, 40% and 50% of cement was replaced with nano-cement. Tests were conducted on concrete to find out the compressive strength and permeability of concrete. The compressive strength of concrete containing nano materials were found to be more than that of normal cement concrete (NCC). The permeability values were found to be decrease with the addition of nano-cement.
Effect on Concrete by Partial Replacement of Cement by Colloidal Nano Alumina...IJCMESJOURNAL
Nanotechnology is a optimistic field in terms of environmental improvements including energy savings and reduced reliability on non-renewable resources, as well as reduced waste, toxicity and carbon emissions. Alumina component reacts with calcium hydroxide produced from the hydration of calcium silicates. The rate of the pozzolanic reaction is proportional to the amount of surface area available for reaction. Therefore, it is possible to add nano- Alumina of a high purity and a high Blaine fineness value in order to improve the characteristics of cement mortars The Aim of this project is to devlope the nano concrete and to study the effects of nano alumina on the properties of concrete. In this investigation the cement is replaced by 10% Fly-ash and Alumina nanoparticles of different proportion i.e 0.5%, 1%, 1.5%, 2.0%, 2.5% & 3% in M40 grade of concrete. It is observed that workability decreased with replacement of cement. The compressive strength of nano concrete casted by partially replacement of 10% fly ash & 2% & 2.5% colloidal nano alumina , increased over conventional concrete about 18.03%, 14.28% for 3 days and 12.7%, 11.27% for 7 days and 4.17% , 2.07% for 28 days. The Split Tensile strength of this concrete increases with 5.73% and 9.16% respectively over conventional concrete for the replacement 1.5% and 2%. Flexural strength of this concrete increases with 13.05% and 26.65% over conventional concrete for the replacement 2% and 2.5%.
CORROSION OF STEEL IN EMBEDDED CONCRETE WITH VOLCANIC AGGREGATES DUE TO SULFA...IAEME Publication
The experimental tests conducted helps to study the concrete properties of volcanic concrete systems with granite replacement of river sand. The test results show that granite rock aggregates is an alternative construction material to river sand with a beneficial effect of reduced permeability properties. Compression strength, Corrosion potential and polarization resistance test results give an impression that 30% river sand replacement in volcanic concrete system is more resistant to sulfate attack as compared to same systems with no replacement. The reduced permeability property of concrete system could lead to reduced chances of corrosion of steel in reinforced concrete structures hence to increased durability of structures.
Building Materials and Concrete Technology Unit IDineshGunturu1
Stones: Classification of Stones – Properties of stones in structural requirements
Bricks: Composition of good brick earth, various methods of manufacturing of bricks
Tiles: Characteristics of good tile – Manufacturing methods, Types of tiles
Wood: Structure – Properties – Seasoning of timber – Classification of various types of woods used in buildings – Defects in timber
Paints: White washing and distempering, Constituents of paint – Types of paints – Painting of new and old wood – Varnish
Properties of Brick Aggregate Concrete as Influenced by the Strength of Brickijtsrd
The principal aim of this study was to research the influence of the strength of brick on the properties of brick aggregate concrete. In doing that the water cement ratio by weight and curing period of concrete for all specimens was kept fixed. The sort of brick as a source of coarse aggregate was the sole variable during this study. Three varieties of brick were utilized during this study to vary the strength of aggregate. These are picked first class brick and second class brick. The mix ratio by volume were 1 1.25 2.5 and 1 1.5 3.0. The fineness modulus of combined sand 50 Sylhet 50 Local was 1.88. Tests were administered on cylinder and prism specimens. Emphasis was given to studying the fundamental properties of hardened concrete like compressive strength, modulus of elasticity, and tensile strength. Attempts were made to form a relation between the properties of concrete and also the strength of bricks. The test results have shown that the properties of concrete the compressive strength, f’c modulus of rupture, fr split tensile strength, fsp and modulus of elasticity, Ecinitially increases at the subsequent rate with the increase of the strength of brick, and then the rate decreases. Md. Mahfujur Rahman | Md. Shohrab Hossain Pavel | Md. Rashedul Islam | Yousuf Ali | Md. Shafiqul Islam | Md. Shariful Islam | Md. Abdul Gone | Shafiqur Rahman "Properties of Brick Aggregate Concrete as Influenced by the Strength of Brick" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd35759.pdf Paper Url: https://www.ijtsrd.com/engineering/civil-engineering/35759/properties-of-brick-aggregate-concrete-as-influenced-by-the-strength-of-brick/md-mahfujur-rahman
STRENGTH AND PERMEABILITY STUDIES ON CONCRETE WITH NANO-CEMENTIAEME Publication
Nanotechnology has received the attention of many researchers for its ability to make use of the unique properties of nano-sized materials for obtaining favourable characteristics. The grain size of the nano particles will be in the order of 10-9 m (1-100nm). Materials at nano stage can change the whole properties of the composites to which these nano particles are added. Nano-particles exhibit unique properties that develop a stronger, more durable concrete with favorable characteristics when added to concrete. Addition of nano materials at the time of production of concrete can lead to significant improvements in the strength and life of concrete. One of the active areas of research dealing with cement and concrete is strength and durability of concrete containing nano particles. An attempt has been made to carry out an experimental investigation on strength and permeability of concrete containing nano-cement. Plasma arching, chemical vapor deposition, electro deposition, sol-gel synthesis, high intensity ball milling etc., are some of the methods reported in the literature to synthesize nano level materials. Nano-cement was made by grinding the commercially available 53 grade Portland cement using a high energy ball grinding mill. A scanning electron microscope was used to determine the particle size of the nano-cement produced. Different grades of concrete viz., M20, M30. M40 and M50 were cast. For each grade of concrete, 10%, 20%, 30%, 40% and 50% of cement was replaced with nano-cement. Tests were conducted on concrete to find out the compressive strength and permeability of concrete. The compressive strength of concrete containing nano materials were found to be more than that of normal cement concrete (NCC). The permeability values were found to be decrease with the addition of nano-cement.
Effect on Concrete by Partial Replacement of Cement by Colloidal Nano Alumina...IJCMESJOURNAL
Nanotechnology is a optimistic field in terms of environmental improvements including energy savings and reduced reliability on non-renewable resources, as well as reduced waste, toxicity and carbon emissions. Alumina component reacts with calcium hydroxide produced from the hydration of calcium silicates. The rate of the pozzolanic reaction is proportional to the amount of surface area available for reaction. Therefore, it is possible to add nano- Alumina of a high purity and a high Blaine fineness value in order to improve the characteristics of cement mortars The Aim of this project is to devlope the nano concrete and to study the effects of nano alumina on the properties of concrete. In this investigation the cement is replaced by 10% Fly-ash and Alumina nanoparticles of different proportion i.e 0.5%, 1%, 1.5%, 2.0%, 2.5% & 3% in M40 grade of concrete. It is observed that workability decreased with replacement of cement. The compressive strength of nano concrete casted by partially replacement of 10% fly ash & 2% & 2.5% colloidal nano alumina , increased over conventional concrete about 18.03%, 14.28% for 3 days and 12.7%, 11.27% for 7 days and 4.17% , 2.07% for 28 days. The Split Tensile strength of this concrete increases with 5.73% and 9.16% respectively over conventional concrete for the replacement 1.5% and 2%. Flexural strength of this concrete increases with 13.05% and 26.65% over conventional concrete for the replacement 2% and 2.5%.
CORROSION OF STEEL IN EMBEDDED CONCRETE WITH VOLCANIC AGGREGATES DUE TO SULFA...IAEME Publication
The experimental tests conducted helps to study the concrete properties of volcanic concrete systems with granite replacement of river sand. The test results show that granite rock aggregates is an alternative construction material to river sand with a beneficial effect of reduced permeability properties. Compression strength, Corrosion potential and polarization resistance test results give an impression that 30% river sand replacement in volcanic concrete system is more resistant to sulfate attack as compared to same systems with no replacement. The reduced permeability property of concrete system could lead to reduced chances of corrosion of steel in reinforced concrete structures hence to increased durability of structures.
Building Materials and Concrete Technology Unit IDineshGunturu1
Stones: Classification of Stones – Properties of stones in structural requirements
Bricks: Composition of good brick earth, various methods of manufacturing of bricks
Tiles: Characteristics of good tile – Manufacturing methods, Types of tiles
Wood: Structure – Properties – Seasoning of timber – Classification of various types of woods used in buildings – Defects in timber
Paints: White washing and distempering, Constituents of paint – Types of paints – Painting of new and old wood – Varnish
Properties of Brick Aggregate Concrete as Influenced by the Strength of Brickijtsrd
The principal aim of this study was to research the influence of the strength of brick on the properties of brick aggregate concrete. In doing that the water cement ratio by weight and curing period of concrete for all specimens was kept fixed. The sort of brick as a source of coarse aggregate was the sole variable during this study. Three varieties of brick were utilized during this study to vary the strength of aggregate. These are picked first class brick and second class brick. The mix ratio by volume were 1 1.25 2.5 and 1 1.5 3.0. The fineness modulus of combined sand 50 Sylhet 50 Local was 1.88. Tests were administered on cylinder and prism specimens. Emphasis was given to studying the fundamental properties of hardened concrete like compressive strength, modulus of elasticity, and tensile strength. Attempts were made to form a relation between the properties of concrete and also the strength of bricks. The test results have shown that the properties of concrete the compressive strength, f’c modulus of rupture, fr split tensile strength, fsp and modulus of elasticity, Ecinitially increases at the subsequent rate with the increase of the strength of brick, and then the rate decreases. Md. Mahfujur Rahman | Md. Shohrab Hossain Pavel | Md. Rashedul Islam | Yousuf Ali | Md. Shafiqul Islam | Md. Shariful Islam | Md. Abdul Gone | Shafiqur Rahman "Properties of Brick Aggregate Concrete as Influenced by the Strength of Brick" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd35759.pdf Paper Url: https://www.ijtsrd.com/engineering/civil-engineering/35759/properties-of-brick-aggregate-concrete-as-influenced-by-the-strength-of-brick/md-mahfujur-rahman
Use of Over-Burnt Bricks as Coarse aggregate in ConcreteEditorIJAERD
In modern construction industry number of materials are used and one of the materials is Brick. Regular
bricks are generally used in buildings or in some other engineering applications. In manufacturing of these bricks, a lot
of waste is produced in the form of over- burnt-bricks. The bricks being near to the fire in the furnace receives a
temperature more heat and eventually shrink and loose its shape, its color becomes reddish. These bricks can’t be used
in construction, directly because of their distorted shape dark color. hose over-burnt brick could be a source of recycled
coarse aggregate. The primary goal of this paper is to assess the suitability of incorporating over-burnt bricks in
concrete, by the partial replacement of natural coarse aggregate (NCA) with overburnt brick aggregate (OBBA) in a
ratio of 20%, 50%, and 100%. Initially, mix proportion of 1:2:4 and w/c of 0.57 was selected. By replacing NCA with
OBBA while using mix proportion of 1:2:4 and w/c of 0.57, the resulting concrete was found non-mixable and nonworkable. Thus, mix was designed (for targeted strength of 4ksi) for all replacement percentages. Slump test was
conducted for each replacement and the results show that by increasing replacement percentage the workability of
concrete decreases. the slump values are in between the range of 3–1.5 inches. For compressive strength the cylindrical
specimens of 6" x 12" were tested at 3, 7, and 28 days. For 20% replacement, the loss in compressive strength is 42.16%
for 3 days and for 7 and 28 days the loss is 46.96% and 61.37% respectively. For 50 % replacement, the loss in strength
for 3, 7 and 28 days is 29.73%, 30.87% and 58.29% respectively. For 100% replacement, the loss in strength for 3, 7 and
28 days is 48.65%, 55.65% and 69.19%.
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.
Experimental Investigations of Mechanical properties on Micro silica (Silica ...IOSR Journals
Abstract : The Now a day, we need to look at a way to reduce the cost of building materials, particularly
cement is currently so high that only rich people and governments can afford meaningful construction. Studies
have been carried out to investigate the possibility of utilizing a broad range of materials as partial replacement
materials for cement in the production of concrete. This study investigated the strength properties of Silica fume
and fly ash concrete. This work primarily deals with the strength characteristics such as compressive, Split
tensile and flexural strength. High performance concrete a set of 7 different concrete mixture were cast and
tested with different cement replacement levels (0%, 2.5%, 5%, 7.5%, 10% 12.5% and15%) of Fly ash (FA) with
silica fume (SF) as addition ( 0%,5%,10 % ,15% ,25and 30%) by wt of Cement and/or each trial super
plasticizer has been added at constant values to achieve a constant range of slump for desired work ability with
a constant water-binder (w/b) ratio of 0.30.Specimens were produced and cured in a curing tank for 3, 7, 14
and 28 days. The cubes were subjected to compressive strength tests after density determination at 3,7,14 and
28 days respectively. The chemical composition and physical composition of micro silica, FlyAsh and cement
were determined. The density of the concrete decreased with increased in percentage of micro silica and Fly ash
replacement up to 15%. Increase in the level of micro silica fume and Fly ash replacement between 30% to 45%
led to a reduction in the compressive strength of hardened concrete. This study has shown that between 15 to
22.5% replacement levels, concrete will develop strength sufficient for construction purposes. Its use will lead
to a reduction in cement quantity required for construction purposes and hence sustainability in the
construction industry as well as aid economic construction.
Keywords: Durability, Fly Ash, High performance Concrete, Silica Fume/Micro Silica, Density, water
absorption
Building Materials and Concrete Technology Unit 4DineshGunturu1
Hardened Concrete-Water / Cement ratio – Abram’s law, Gel space ratio, Nature of strength of concrete – Maturity concept, Strength in tension and compression – Properties of Hardened Concrete (Elasticity, Creep, Shrinkage, Poisson’s ratio, Water absorption, Permeability, etc.), Relating between compression and tensile strength, Curing
Performance of lateritic concrete under environmental harsh conditioneSAT Journals
Abstract This is an investigation of weathering characteristics of Laterized concrete with laterite-fine aggregate ratio as a factor. It was done with a view of ascertaining the suitability of laterite as aggregate substitutes at 0, 10, 20, 30 and 40% of fine aggregate used in the construction industry. The weathering characteristics were examined by conditioning laterized concrete cubes to varying temperatures, chemical and alternate wetting and drying, which all represent the operating weather conditions (wet and dry seasons) in tropics, including Nigeria. The mix proportion used was 1:2:4, the curing age of the laterized concrete was based on 28days curing age, while the compressive strength of the treated laterized concrete cubes was determined. The result of this research showed that the compressive strength of laterized concrete with laterite-fine aggregate ratio variation decreases when subjected to alternate wetting and drying and increases when subjected to magnesium sulphate (Mg2SO4). It was also discovered that a laterized concrete with a laterite-fine aggregate ratio of 20% conditioned to a temperature range of 100oC attained optimum compressive strength of 12.90Nmm-2 Keywords: Laterized Concrete, Comprehensive strength, Weathering Characteristics
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
SOLIGNUM TREATED SAWDUST AS FINE AGGREGATE IN CONCRETE PRODUCTIONIAEME Publication
The cost of construction has been on the increasewhich has become a concern to both individuals and government of especially developing countries,and that iswhy this study isaimed at using available cheap materials (sawdust) in concrete production. Concrete mix ratio of 1:2:4 was usedand replacedwith fine aggregate at 5%, 10%, 15% and 20% with soligum treated sawdust. From the tests conducted, it was observed that increase in sawdust resulted in decrease in the compressive strength of the concrete. Also it was observed that increase in the sawdust content resulted in the reduction of weight of the concrete. In conclusion sawdust as an air entrainingagent has n appreciable positive effect on the compressive strength of concrete. The reduction in strength of concrete with sawdust as fine aggregate wasdue to its higher rate of water absorption because the higher the water contents in concrete, The lower the strength of the concrete
Experimental Investigation of High – Strength Characteristics of Self Curing ...IJMTST Journal
In concrete structures exposed to the ambient air at early ages, the moisture content in concrete
decreases due to moisture diffusion. In addition, self-desiccation due to hydration of cement causes an
additional decrease of moisture content in concrete at early ages, especially for high-strength concrete. In this
study, the internal relative humidity in drying concrete specimens was measured at early ages. Furthermore,
the variation of relative humidity due to self-desiccation in sealed specimen was measured. The moisture
distribution in low-strength concrete with high water/cement ratio was mostly influenced by moisture
diffusion due to drying rather than self-desiccation. In high-strength concrete with low water/cement ratio,
however, self-desiccation had a considerable influence on moisture distribution. The results obtained from
the moisture diffusion theory were in good agreement with experimental results.
compressive strength of concrete containing milled glass as partial substitut...IJAEMSJORNAL
This work reports the outcome of an experiment carried out by using milled glass (MG) of varying percentages (20%, 40% and 60% by weight)of cement in concrete making. MG was sourced for and milled to required fineness. The concrete was batched with mix ratio of 1։2։ 4. Concrete Cube specimens produced were allowed to cure for 7-28 days and compressive strength, slump and setting time tests were carried out and were compared with those of conventional concrete (0% MG). Results obtained showed that compressive strength of the concrete increased with increase in length of curing age, but decreased as the percentage of MG increased. However, the strength still remained in the allowable range of workability for concrete in line with British standard. MG replacement of 20% was found to be the most suitable mix considering the strength and safe use of the concrete. It was concluded that MG replacement of 20% showed no significant loss in strength compared to the control sample and is stable and could be acceptable in most concrete. At the long run. Waste glass that currently constitutes waste concern in built environment in Nigeria can best be managed through alternative use in concrete production.
As concrete is the most abundant material used in the world, it contains aggregate content of around 60 to 70 %. Since aggregate are being used rapidly there has been a scarcity in the avaibility of these materials. This research investigates the effect of partially replacing aggregates by burnt brick bats and lateritic fines in concrete respectively for M25 grade concrete. The incorporation is done for 5%, 10% and 15% of burnt brick bats for coarse aggregate and by talking 15% of lateritic fines as constant for fine aggregate by conducting compressive strength test which gave the optimum value of 15% for natural sand. The compressive strength, split tensile strength and flexural strength was conducted. The results showed density of of the concrete incorporating brick and laterite was lower compared to conventional concrete, the concrete with 5% burnt brick and 15% lateritic soil showed increased strength for 7 days compared to normal concrete but when 28 days test was conducted the strength was similar to conventional concrete. The split tensile and flexural strength of replaced concrete was found to be lower than the nominal concrete.
Use of Over-Burnt Bricks as Coarse aggregate in ConcreteEditorIJAERD
In modern construction industry number of materials are used and one of the materials is Brick. Regular
bricks are generally used in buildings or in some other engineering applications. In manufacturing of these bricks, a lot
of waste is produced in the form of over- burnt-bricks. The bricks being near to the fire in the furnace receives a
temperature more heat and eventually shrink and loose its shape, its color becomes reddish. These bricks can’t be used
in construction, directly because of their distorted shape dark color. hose over-burnt brick could be a source of recycled
coarse aggregate. The primary goal of this paper is to assess the suitability of incorporating over-burnt bricks in
concrete, by the partial replacement of natural coarse aggregate (NCA) with overburnt brick aggregate (OBBA) in a
ratio of 20%, 50%, and 100%. Initially, mix proportion of 1:2:4 and w/c of 0.57 was selected. By replacing NCA with
OBBA while using mix proportion of 1:2:4 and w/c of 0.57, the resulting concrete was found non-mixable and nonworkable. Thus, mix was designed (for targeted strength of 4ksi) for all replacement percentages. Slump test was
conducted for each replacement and the results show that by increasing replacement percentage the workability of
concrete decreases. the slump values are in between the range of 3–1.5 inches. For compressive strength the cylindrical
specimens of 6" x 12" were tested at 3, 7, and 28 days. For 20% replacement, the loss in compressive strength is 42.16%
for 3 days and for 7 and 28 days the loss is 46.96% and 61.37% respectively. For 50 % replacement, the loss in strength
for 3, 7 and 28 days is 29.73%, 30.87% and 58.29% respectively. For 100% replacement, the loss in strength for 3, 7 and
28 days is 48.65%, 55.65% and 69.19%.
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.
Experimental Investigations of Mechanical properties on Micro silica (Silica ...IOSR Journals
Abstract : The Now a day, we need to look at a way to reduce the cost of building materials, particularly
cement is currently so high that only rich people and governments can afford meaningful construction. Studies
have been carried out to investigate the possibility of utilizing a broad range of materials as partial replacement
materials for cement in the production of concrete. This study investigated the strength properties of Silica fume
and fly ash concrete. This work primarily deals with the strength characteristics such as compressive, Split
tensile and flexural strength. High performance concrete a set of 7 different concrete mixture were cast and
tested with different cement replacement levels (0%, 2.5%, 5%, 7.5%, 10% 12.5% and15%) of Fly ash (FA) with
silica fume (SF) as addition ( 0%,5%,10 % ,15% ,25and 30%) by wt of Cement and/or each trial super
plasticizer has been added at constant values to achieve a constant range of slump for desired work ability with
a constant water-binder (w/b) ratio of 0.30.Specimens were produced and cured in a curing tank for 3, 7, 14
and 28 days. The cubes were subjected to compressive strength tests after density determination at 3,7,14 and
28 days respectively. The chemical composition and physical composition of micro silica, FlyAsh and cement
were determined. The density of the concrete decreased with increased in percentage of micro silica and Fly ash
replacement up to 15%. Increase in the level of micro silica fume and Fly ash replacement between 30% to 45%
led to a reduction in the compressive strength of hardened concrete. This study has shown that between 15 to
22.5% replacement levels, concrete will develop strength sufficient for construction purposes. Its use will lead
to a reduction in cement quantity required for construction purposes and hence sustainability in the
construction industry as well as aid economic construction.
Keywords: Durability, Fly Ash, High performance Concrete, Silica Fume/Micro Silica, Density, water
absorption
Building Materials and Concrete Technology Unit 4DineshGunturu1
Hardened Concrete-Water / Cement ratio – Abram’s law, Gel space ratio, Nature of strength of concrete – Maturity concept, Strength in tension and compression – Properties of Hardened Concrete (Elasticity, Creep, Shrinkage, Poisson’s ratio, Water absorption, Permeability, etc.), Relating between compression and tensile strength, Curing
Performance of lateritic concrete under environmental harsh conditioneSAT Journals
Abstract This is an investigation of weathering characteristics of Laterized concrete with laterite-fine aggregate ratio as a factor. It was done with a view of ascertaining the suitability of laterite as aggregate substitutes at 0, 10, 20, 30 and 40% of fine aggregate used in the construction industry. The weathering characteristics were examined by conditioning laterized concrete cubes to varying temperatures, chemical and alternate wetting and drying, which all represent the operating weather conditions (wet and dry seasons) in tropics, including Nigeria. The mix proportion used was 1:2:4, the curing age of the laterized concrete was based on 28days curing age, while the compressive strength of the treated laterized concrete cubes was determined. The result of this research showed that the compressive strength of laterized concrete with laterite-fine aggregate ratio variation decreases when subjected to alternate wetting and drying and increases when subjected to magnesium sulphate (Mg2SO4). It was also discovered that a laterized concrete with a laterite-fine aggregate ratio of 20% conditioned to a temperature range of 100oC attained optimum compressive strength of 12.90Nmm-2 Keywords: Laterized Concrete, Comprehensive strength, Weathering Characteristics
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
SOLIGNUM TREATED SAWDUST AS FINE AGGREGATE IN CONCRETE PRODUCTIONIAEME Publication
The cost of construction has been on the increasewhich has become a concern to both individuals and government of especially developing countries,and that iswhy this study isaimed at using available cheap materials (sawdust) in concrete production. Concrete mix ratio of 1:2:4 was usedand replacedwith fine aggregate at 5%, 10%, 15% and 20% with soligum treated sawdust. From the tests conducted, it was observed that increase in sawdust resulted in decrease in the compressive strength of the concrete. Also it was observed that increase in the sawdust content resulted in the reduction of weight of the concrete. In conclusion sawdust as an air entrainingagent has n appreciable positive effect on the compressive strength of concrete. The reduction in strength of concrete with sawdust as fine aggregate wasdue to its higher rate of water absorption because the higher the water contents in concrete, The lower the strength of the concrete
Experimental Investigation of High – Strength Characteristics of Self Curing ...IJMTST Journal
In concrete structures exposed to the ambient air at early ages, the moisture content in concrete
decreases due to moisture diffusion. In addition, self-desiccation due to hydration of cement causes an
additional decrease of moisture content in concrete at early ages, especially for high-strength concrete. In this
study, the internal relative humidity in drying concrete specimens was measured at early ages. Furthermore,
the variation of relative humidity due to self-desiccation in sealed specimen was measured. The moisture
distribution in low-strength concrete with high water/cement ratio was mostly influenced by moisture
diffusion due to drying rather than self-desiccation. In high-strength concrete with low water/cement ratio,
however, self-desiccation had a considerable influence on moisture distribution. The results obtained from
the moisture diffusion theory were in good agreement with experimental results.
compressive strength of concrete containing milled glass as partial substitut...IJAEMSJORNAL
This work reports the outcome of an experiment carried out by using milled glass (MG) of varying percentages (20%, 40% and 60% by weight)of cement in concrete making. MG was sourced for and milled to required fineness. The concrete was batched with mix ratio of 1։2։ 4. Concrete Cube specimens produced were allowed to cure for 7-28 days and compressive strength, slump and setting time tests were carried out and were compared with those of conventional concrete (0% MG). Results obtained showed that compressive strength of the concrete increased with increase in length of curing age, but decreased as the percentage of MG increased. However, the strength still remained in the allowable range of workability for concrete in line with British standard. MG replacement of 20% was found to be the most suitable mix considering the strength and safe use of the concrete. It was concluded that MG replacement of 20% showed no significant loss in strength compared to the control sample and is stable and could be acceptable in most concrete. At the long run. Waste glass that currently constitutes waste concern in built environment in Nigeria can best be managed through alternative use in concrete production.
As concrete is the most abundant material used in the world, it contains aggregate content of around 60 to 70 %. Since aggregate are being used rapidly there has been a scarcity in the avaibility of these materials. This research investigates the effect of partially replacing aggregates by burnt brick bats and lateritic fines in concrete respectively for M25 grade concrete. The incorporation is done for 5%, 10% and 15% of burnt brick bats for coarse aggregate and by talking 15% of lateritic fines as constant for fine aggregate by conducting compressive strength test which gave the optimum value of 15% for natural sand. The compressive strength, split tensile strength and flexural strength was conducted. The results showed density of of the concrete incorporating brick and laterite was lower compared to conventional concrete, the concrete with 5% burnt brick and 15% lateritic soil showed increased strength for 7 days compared to normal concrete but when 28 days test was conducted the strength was similar to conventional concrete. The split tensile and flexural strength of replaced concrete was found to be lower than the nominal concrete.
Flexural Behavior of Fibrous Reinforced Cement Concrete Blended With Fly Ash ...Ijripublishers Ijri
Research for high strength and better performance characteristics of concrete are leading the researchers for developing
better structural concrete and new structural application techniques.New types of concrete have come in application
in construction by using supplementary cementitious materials like fly ash, silica fume metakaoline, nanosilica and
other materials using various reinforcing materials like different type of fibers for achieving better performance for the
composite compared to the normal concrete.In the present experimental investigation, a mix design for high strength
concrete of M80 is tried using triple blending technique with ternary blend of metakaoline and fly ash as partial replacement
by weight of cement at various blended percentages ranging between 10%-40% with steel fibers having aspect ratio
of 50. The various percentages of steel fibers to be tried are 0%, 0.5% and 1% by volume of concrete. The workability is
measured for its consistency using compaction factor method.The project aims at finding the optimum replacement of
cement by fly ash and metakaoline from which maximum benefit in various strengths and workability of the mix can be
obtained. The results of fiber reinforced specimens with various percentages of ternary blend are compared with control
specimens to study the behaviour of FRC properties with various percentages of the blends as partial replacement by
weight of cement. Sufficient number of cubes and beams will be cast. The case specimens will be tested for the change
in compressive and flexural strengths at 7 & 28 days for M80 concrete.It is expected that the results of present investigation
would help to arrive at the optimum percentages of the admixtures and fibre reinforcement to achieve optimum
strength properties of the composite.
The Research on Process and Application of Self-Compacting ConcreteIJERA Editor
Self-compacting concrete (SCC) is one kind of concrete with high workability and durability. First of all, this paper introduces the definition and history of Self-compacting concrete (SCC). Secondly, it introduces the raw material selection, equipped technology and the mix proportion design method of Self-compacting concrete. Finally, it analyzes the problems and countermeasures of self-compacting concrete and look ahead the application prospect of it.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers