International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Fly Ash as a Partial Replacement of Cement in Concrete and Durability Study o...IJERD Editor
This document presents research on the use of fly ash as a partial replacement for cement in concrete. Concrete cubes were produced with 0%, 5%, 10%, 15%, and 20% cement replacement by fly ash. The cubes were cured in water as well as 1%, 3%, and 5% sulfuric acid solutions. Compressive strength was tested at 28, 60, and 90 days. Results showed that cubes with 10% fly ash replacement had the highest strength when cured in water and acid solutions. Fly ash concrete also demonstrated improved durability in acidic environments compared to normal concrete. In general, fly ash concrete performed better with increasing curing time and showed potential to enhance concrete durability.
Fly ash and silica fume concrete mix design Saiduluthota
This document discusses using fly ash and silica fume as partial replacements for cement in concrete. It outlines the objectives to study their effects on compressive strength and find optimal replacement percentages. The methodology describes casting specimens with 0%, 30%, and 40% fly ash replacement and 15%, 20% silica fume replacement. Test results showed that compressive strength generally increased with age but decreased with higher replacement levels initially before surpassing plain concrete at later ages. Both fly ash and silica fume concretes exhibited lower permeability. The conclusion is that pozzolanic replacements can improve water permeability and mechanical properties of concrete.
Experimental study on strength and durability properties of concrete by using...vikram patel
The document describes an experimental study on using industrial waste to improve the strength and durability of concrete. It discusses replacing natural aggregates with waste tire rubber in concrete. Previous research found reductions in mechanical properties but improvements in durability. The study aims to investigate properties of rubberized concrete and determine an optimum replacement level of aggregates. Tests will be conducted on concrete mixtures with 0-50% coarse aggregate replaced by treated waste rubber to evaluate compressive strength and workability. The results could provide a more sustainable and cost-effective concrete production method while reducing waste.
A REPORT ON PARTIAL SUBSTITUTE OF CEMENT IN CONCRETE USING RICE HUSK ASHIAEME Publication
Objectives: This research work is to examine the partial replacement of cement in concrete mistreatment rice husk ash. It involved the study of strength properties of the concrete with totally different proportions of rice husk ash as partial replacement in cement. Methods: The major problem sweet-faced by the globe nowadays is that the environmental pollution. In the industry, mainly the production of cement can cause the emission of pollutants that includes a nice impact on atmosphere. This can be reduced by the magnified usage of business by-products within the industry. Findings: In this present study, to produce the concrete, Portland cement is partially substituted with Rice husk ash. Different ratios of partial replacement is done like 1/3, 5%, 10%, 15%, 20%, and 25% is taken to prepare completely different mixes. The concrete specimens are tested for their compressive strength, split tensile strength take a look at and flexural strength test at the age of seven and twenty eight days.
High Performance Concrete & Durability of ConcreteAbhal Gudhka
This e-poster by students from A. D. Patel Institute of Technology discusses high performance concrete (HPC) and concrete durability. HPC has improved workability, high strength, and durability. The poster explains factors affecting concrete durability like permeability and chemical attacks. It presents methods to improve durability including using mineral and chemical admixtures. Specifically, fly ash is discussed as an admixture that improves strength, permeability, alkali-silica reaction resistance, and reduces heat of hydration. A case study on a university building that used high volume fly ash concrete is also summarized.
Bagasse ash as a partial replacement to cement. This replacement can improve the properties of cement as well as, it reduces the effects over the environment.
PRODUCTION OF BRICKS FROM RECYCLE PAPER MILL WASTENayana 54321
(1) The document discusses producing low-cost, low-energy, lightweight bricks using recycled paper mill waste (RPMW) and cement. (2) Literature shows that bricks containing waste materials have positive physical and mechanical properties and thermal insulation. (3) Tests found RPMW-cement bricks have compressive strengths over 9 MPa, higher than conventional clay bricks, and are a sustainable substitute with benefits like insulation and shock absorption. (4) In conclusion, RPMW-cement bricks can replace conventional bricks while being more sustainable with lower weight, energy use, and emissions.
Fly Ash as a Partial Replacement of Cement in Concrete and Durability Study o...IJERD Editor
This document presents research on the use of fly ash as a partial replacement for cement in concrete. Concrete cubes were produced with 0%, 5%, 10%, 15%, and 20% cement replacement by fly ash. The cubes were cured in water as well as 1%, 3%, and 5% sulfuric acid solutions. Compressive strength was tested at 28, 60, and 90 days. Results showed that cubes with 10% fly ash replacement had the highest strength when cured in water and acid solutions. Fly ash concrete also demonstrated improved durability in acidic environments compared to normal concrete. In general, fly ash concrete performed better with increasing curing time and showed potential to enhance concrete durability.
Fly ash and silica fume concrete mix design Saiduluthota
This document discusses using fly ash and silica fume as partial replacements for cement in concrete. It outlines the objectives to study their effects on compressive strength and find optimal replacement percentages. The methodology describes casting specimens with 0%, 30%, and 40% fly ash replacement and 15%, 20% silica fume replacement. Test results showed that compressive strength generally increased with age but decreased with higher replacement levels initially before surpassing plain concrete at later ages. Both fly ash and silica fume concretes exhibited lower permeability. The conclusion is that pozzolanic replacements can improve water permeability and mechanical properties of concrete.
Experimental study on strength and durability properties of concrete by using...vikram patel
The document describes an experimental study on using industrial waste to improve the strength and durability of concrete. It discusses replacing natural aggregates with waste tire rubber in concrete. Previous research found reductions in mechanical properties but improvements in durability. The study aims to investigate properties of rubberized concrete and determine an optimum replacement level of aggregates. Tests will be conducted on concrete mixtures with 0-50% coarse aggregate replaced by treated waste rubber to evaluate compressive strength and workability. The results could provide a more sustainable and cost-effective concrete production method while reducing waste.
A REPORT ON PARTIAL SUBSTITUTE OF CEMENT IN CONCRETE USING RICE HUSK ASHIAEME Publication
Objectives: This research work is to examine the partial replacement of cement in concrete mistreatment rice husk ash. It involved the study of strength properties of the concrete with totally different proportions of rice husk ash as partial replacement in cement. Methods: The major problem sweet-faced by the globe nowadays is that the environmental pollution. In the industry, mainly the production of cement can cause the emission of pollutants that includes a nice impact on atmosphere. This can be reduced by the magnified usage of business by-products within the industry. Findings: In this present study, to produce the concrete, Portland cement is partially substituted with Rice husk ash. Different ratios of partial replacement is done like 1/3, 5%, 10%, 15%, 20%, and 25% is taken to prepare completely different mixes. The concrete specimens are tested for their compressive strength, split tensile strength take a look at and flexural strength test at the age of seven and twenty eight days.
High Performance Concrete & Durability of ConcreteAbhal Gudhka
This e-poster by students from A. D. Patel Institute of Technology discusses high performance concrete (HPC) and concrete durability. HPC has improved workability, high strength, and durability. The poster explains factors affecting concrete durability like permeability and chemical attacks. It presents methods to improve durability including using mineral and chemical admixtures. Specifically, fly ash is discussed as an admixture that improves strength, permeability, alkali-silica reaction resistance, and reduces heat of hydration. A case study on a university building that used high volume fly ash concrete is also summarized.
Bagasse ash as a partial replacement to cement. This replacement can improve the properties of cement as well as, it reduces the effects over the environment.
PRODUCTION OF BRICKS FROM RECYCLE PAPER MILL WASTENayana 54321
(1) The document discusses producing low-cost, low-energy, lightweight bricks using recycled paper mill waste (RPMW) and cement. (2) Literature shows that bricks containing waste materials have positive physical and mechanical properties and thermal insulation. (3) Tests found RPMW-cement bricks have compressive strengths over 9 MPa, higher than conventional clay bricks, and are a sustainable substitute with benefits like insulation and shock absorption. (4) In conclusion, RPMW-cement bricks can replace conventional bricks while being more sustainable with lower weight, energy use, and emissions.
UTILIZATION OF COPPER SLAG AS A PARTIAL REPLACEMENT OF FINE AGGREGATE IN CONC...AM Publications
Today’s world is facing challenging and unsolved environmental problem such as global warming, forest destruction and lack of resources. In order to solve these environmental problems, resources recycling have to be done in environmentally safer methods. As there is a vast scarcity the production of aggregates for concrete the recycled materials have great demand. The present study mainly focuses on investigating the effect of using copper slag as a replacement of fine aggregate on the strength properties. In this report, M25 grade concrete was used and tests were conducted for various proportions of copper slag replacement with sand of 40%, 80% and 100% in concrete. In the first case along with replacement of copper slag with sand there is an attempt is made to replace the cement with 50% flyash similarly in second case for 30% replacement of cement with flyash replacement and in the third case with no replacement of cement with flyash. The obtained results were compared with those of nominal concrete made with ordinary Portland cement and sand. Further split tensile strength and flexural strength studies were also performed to check its durability aspects.
This document discusses silica fume, a byproduct of silicon and ferrosilicon metal production that is used to improve the properties of concrete. It defines silica fume and notes its amorphous structure and small particle size. The document outlines the metals that produce silica fume and lists its physical properties. It then explains how silica fume provides technical advantages and resource conservation when added to concrete, increasing its strength, density, and durability while reducing permeability. The document presents data showing increased concrete strengths from silica fume additions and notes its benefits for corrosion protection. It also discusses environmental benefits and cautions of using silica fume in concrete.
This document studied the effect of adding waste rubber to concrete. It conducted tests with concrete mixtures replacing the coarse aggregates with 5%, 10%, 15%, 20%, 25%, 30%, 50% and 100% rubber by volume. The results showed that as the percentage of rubber replacement increased, the compressive strength, slump, and density of the concrete decreased. However, adding rubber improves the concrete's elasticity and deformation properties while providing an environmentally friendly way to dispose of waste tires. The study concluded that rubberized concrete is most suitable for applications not requiring high strength, such as concrete pavements.
This document discusses using plastic bottle strips to stabilize soil. Unstable expansive soils like black cotton soil cause problems for foundations due to swelling, shrinkage, and unequal settlement. Soil stabilization is done to improve strength and prevent erosion. Plastic is a good stabilizer as it is flexible, water resistant, and provides thermal resistance. Tests on lateritic soil mixed with plastic strips at 0.6% found increased CBR values and reduced settlement under loading compared to unmixed soil, demonstrating plastic's effectiveness as a stabilizer. Using waste plastic bottles in this way provides an economical solution while reducing plastic waste.
This presentation is about Eco-friendly concrete also known as Green Concrete. It covers the need, material used for the manufacturing of Green Concrete and the advantages & limitations of Green concrete.
Best Regards:
Engr. Muhammad Ali Rehman
Special concrete is used when special properties are more important than normal concrete properties. It is produced using chemical and mineral admixtures added to conventional concrete mixes. There are several types of special concrete including lightweight concrete, high strength concrete, fibre reinforced concrete, ferrocement, ready mix concrete, and others. Each type has specific properties and uses in construction where standard concrete is not suitable.
Aggregates make up 65-80% of concrete's volume and are inert fillers that float in the cement paste. Their characteristics impact the performance of fresh and hardened concrete. Aggregates are classified based on size, specific gravity, availability, shape, and texture. Proper aggregate grading leads to a dense, strong concrete mixture. The fineness modulus is a number that indicates an aggregate's grading, and the flakiness index measures elongated particles. Well-graded aggregates with low elongation produce high quality concrete.
Glass powder replacement for cement.by ananth k p coorgMujeeb Muji
This document discusses a research study on using waste glass powder as a partial replacement for cement in concrete. The objectives were to increase workability, compressive strength, and lighten the concrete, while also reducing landfill waste. Glass powder replaced up to 30% of cement in the concrete mixes. The results showed that mixes with glass powder had higher workability and only slightly lower compressive strength compared to standard mixes. The glass powder also lightened the concrete. Therefore, the study concluded that using waste glass powder in concrete is an effective way to increase sustainability while maintaining adequate performance properties.
This document discusses metakaolin, which is produced by calcining kaolin clay between 650-800°C. It has pozzolanic properties and can partially replace cement in high strength concrete. Metakaolin increases the strength and durability of concrete by reacting with calcium hydroxide to produce additional calcium-silicate-hydrate gel. It improves the physical and chemical properties of concrete, leading to applications in infrastructure like bridges, dams, and buildings where high strength and durability are important.
Final report on Behaviour of Geopolymer Concretechetansingh999
This document is a thesis submitted by Chetan Singh Pundeer to fulfill the requirements for a B.Tech degree in Civil Engineering from Lingaya's University. It involves a study of the behavior of geopolymer concrete. Chetan declares that the work is original and was carried out under the supervision of Utkarsh Yadav. The thesis acknowledges the guidance of Nazim Ali and assistance of Utkarsh Yadav. The abstract indicates that the study focuses on developing environmentally friendly geopolymer concrete using fly ash as a cement replacement and studying its durability when exposed to acids, sulfates and chlorides.
A report on use of waste plastic in concreteVed Jangid
The document appears to be a project report submitted by five students for their Bachelor of Technology degree. It investigates using plastic waste as a partial replacement for coarse aggregates in concrete. The report includes sections on materials testing, mix design, casting of test specimens, testing of compressive and flexural strength, and analysis of results. The overall aim is to study the suitability of using plastic waste in concrete and determine the impact on properties like strength.
Admixtures are added to concrete mixes to improve performance properties. Common types include plasticizers, superplasticizers, retarders, accelerators, and air-entraining admixtures. They allow reductions in water content or increases in workability. Trial mixes should be done to determine appropriate dosage for a given mix, as effect depends on cement and aggregates used. Admixtures improve qualities like strength, permeability, bleeding resistance, and durability in freezing environments.
Effect of coconut fibre in concrete and to improve thehsaam hsaam
This document discusses the use of coconut fibre in concrete. Coconut fibre is extracted from the outer shell of coconuts and is one of the most ductile and tough natural fibres. It has high tensile strength and is capable of withstanding strains 4-6 times more than other natural fibres. The objective of the study is to enhance the strength properties of concrete by adding coconut fibre. Different tests will be conducted on fresh and hardened concrete with coconut fibre added at various percentages to determine workability and strength properties. The study will also investigate the effect of incorporating a superplasticizer to improve workability of concrete containing coconut fibre.
This document investigates replacing cement with rice husk ash in concrete. An experiment was conducted replacing 20% of cement with rice husk ash. The compressive strength at 7, 14, 21, and 28 days with 20% replacement was found to compare favorably to concrete without replacement. Using rice husk ash provides benefits like reducing greenhouse gas emissions and construction costs while utilizing an agricultural waste. The results indicate rice husk ash is a suitable partial replacement for cement in concrete.
Mix Design of Grade M35 by Replacement of Cement with Rice Husk Ash in ConcreteDr. Amarjeet Singh
The optimized RHA, by controlled burn or
grinding, has been used as a pozzolanic material in cement
and concrete. Using it provides several advantages, such as
improved strength and durability properties, and
environmental benefits related to the disposal of waste
materials and to reduced carbon dioxide emissions. Up to
now, little research has been done to investigate the use of
RHA as supplementary material in cement and concrete
production .The main objective of this work is to study the
suitability of the rice husk ash as a pozzolanic material for
cement replacement in concrete. However it is expected that
the use of rice husk ash in concrete improve the strength
properties of concrete. Also it is an attempt made to develop
the concrete using rice husk ash as a source material for
partial replacement of cement, which satisfies the structural
properties of concrete like compressive strength.
Sustainable concrete uses less energy and produces fewer carbon emissions than regular concrete. It incorporates waste and recycled materials like fly ash and slag to replace portions of cement. Using these supplementary cementitious materials can increase sustainability by reducing embodied energy and carbon in the concrete. Sustainable strategies also include minimizing water use, using local and recycled aggregates, and designing for durability to lessen environmental impacts over the concrete's lifetime. The presentation outlined various approaches to sustainable concrete and its advantages in promoting greener construction.
This document summarizes a seminar presentation on rice husk ash (RHA). RHA is obtained by burning rice husks between 600-700 degrees Celsius for 2 hours. It is high in silica content and can be used to partially replace cement in concrete production. The addition of RHA increases strength and durability by reducing calcium hydroxide levels in concrete. It also reduces efflorescence and susceptibility to chemical and sulfate attacks. Using RHA in concrete can help reduce carbon dioxide emissions from cement production and provides an economic use for the agricultural waste product of rice husks. The seminar outlines the production, properties and advantages of using RHA in concrete.
This document discusses soil cement, which is a compacted mixture of soil/aggregate, Portland cement, and water. It is used as a low-cost pavement base material. The document outlines the raw materials, types, applications, performance advantages and disadvantages of soil cement. Some key points are that soil cement can strengthen failing granular base pavements in an efficient and economical way, and that it distributes loads well and resists damage from weather due to its rigid characteristics. However, it requires proper moisture levels and can crack over time.
This document summarizes different types of piles used in construction foundations including friction piles, end bearing piles, sheet piles, load piles, and more. It describes how piles can be made of timber, steel, concrete, or composites. The document also outlines various pile driving methods such as drop hammers, single/double acting steam hammers, diesel hammers, vibratory drivers, and safety procedures for pile driving operations.
Durability Studies on Concrete with Hypo Sludge as Partial Replacement of CementIJERA Editor
This paper summarizes the research work on the properties of hypo sludge when used as partial replacement for
Ordinary Portland Cement (OPC) in concrete. OPC was replaced with hypo sludge by weight at 0%, 5%, 10%,
15%, 20% and 25%. 0% replacement served as the control. Compacting factor test was carried out on fresh
concrete while Compressive Strength test was carried out on hardened 150mm concrete cubes after 7, 14 and 28
days curing in water. The results revealed that the Compacting factor decreased as the percentage replacement
of OPC with hypo sludge increased. The compressive strength of the hardened concrete also decreased with
increasing OPC replacement with hypo sludge. It is recommended that further studies be carried out to gather
more facts about the suitability of partial replacement of OPC with hypo sludge in concrete.
IRJET - Effect of Using Different Substitutes as Partial Replacement of Cemen...IRJET Journal
This document discusses a study on the effect of using different substitutes for partial replacement of cement and aggregate on the strength of concrete. Concrete cubes with M20 design mix were cast using fly ash, marble powder, M-sand and concrete waste to partially or fully replace cement and sand. The concrete cubes were tested after 28 days to determine their compressive strength. It was found that fly ash and marble powder can partially replace cement at 15% and 10-15% respectively without reducing strength. M-sand was found to increase strength even at 15% replacement of sand. Concrete waste also provided satisfactory strength when used to fully replace coarse aggregate and partially replace sand.
UTILIZATION OF COPPER SLAG AS A PARTIAL REPLACEMENT OF FINE AGGREGATE IN CONC...AM Publications
Today’s world is facing challenging and unsolved environmental problem such as global warming, forest destruction and lack of resources. In order to solve these environmental problems, resources recycling have to be done in environmentally safer methods. As there is a vast scarcity the production of aggregates for concrete the recycled materials have great demand. The present study mainly focuses on investigating the effect of using copper slag as a replacement of fine aggregate on the strength properties. In this report, M25 grade concrete was used and tests were conducted for various proportions of copper slag replacement with sand of 40%, 80% and 100% in concrete. In the first case along with replacement of copper slag with sand there is an attempt is made to replace the cement with 50% flyash similarly in second case for 30% replacement of cement with flyash replacement and in the third case with no replacement of cement with flyash. The obtained results were compared with those of nominal concrete made with ordinary Portland cement and sand. Further split tensile strength and flexural strength studies were also performed to check its durability aspects.
This document discusses silica fume, a byproduct of silicon and ferrosilicon metal production that is used to improve the properties of concrete. It defines silica fume and notes its amorphous structure and small particle size. The document outlines the metals that produce silica fume and lists its physical properties. It then explains how silica fume provides technical advantages and resource conservation when added to concrete, increasing its strength, density, and durability while reducing permeability. The document presents data showing increased concrete strengths from silica fume additions and notes its benefits for corrosion protection. It also discusses environmental benefits and cautions of using silica fume in concrete.
This document studied the effect of adding waste rubber to concrete. It conducted tests with concrete mixtures replacing the coarse aggregates with 5%, 10%, 15%, 20%, 25%, 30%, 50% and 100% rubber by volume. The results showed that as the percentage of rubber replacement increased, the compressive strength, slump, and density of the concrete decreased. However, adding rubber improves the concrete's elasticity and deformation properties while providing an environmentally friendly way to dispose of waste tires. The study concluded that rubberized concrete is most suitable for applications not requiring high strength, such as concrete pavements.
This document discusses using plastic bottle strips to stabilize soil. Unstable expansive soils like black cotton soil cause problems for foundations due to swelling, shrinkage, and unequal settlement. Soil stabilization is done to improve strength and prevent erosion. Plastic is a good stabilizer as it is flexible, water resistant, and provides thermal resistance. Tests on lateritic soil mixed with plastic strips at 0.6% found increased CBR values and reduced settlement under loading compared to unmixed soil, demonstrating plastic's effectiveness as a stabilizer. Using waste plastic bottles in this way provides an economical solution while reducing plastic waste.
This presentation is about Eco-friendly concrete also known as Green Concrete. It covers the need, material used for the manufacturing of Green Concrete and the advantages & limitations of Green concrete.
Best Regards:
Engr. Muhammad Ali Rehman
Special concrete is used when special properties are more important than normal concrete properties. It is produced using chemical and mineral admixtures added to conventional concrete mixes. There are several types of special concrete including lightweight concrete, high strength concrete, fibre reinforced concrete, ferrocement, ready mix concrete, and others. Each type has specific properties and uses in construction where standard concrete is not suitable.
Aggregates make up 65-80% of concrete's volume and are inert fillers that float in the cement paste. Their characteristics impact the performance of fresh and hardened concrete. Aggregates are classified based on size, specific gravity, availability, shape, and texture. Proper aggregate grading leads to a dense, strong concrete mixture. The fineness modulus is a number that indicates an aggregate's grading, and the flakiness index measures elongated particles. Well-graded aggregates with low elongation produce high quality concrete.
Glass powder replacement for cement.by ananth k p coorgMujeeb Muji
This document discusses a research study on using waste glass powder as a partial replacement for cement in concrete. The objectives were to increase workability, compressive strength, and lighten the concrete, while also reducing landfill waste. Glass powder replaced up to 30% of cement in the concrete mixes. The results showed that mixes with glass powder had higher workability and only slightly lower compressive strength compared to standard mixes. The glass powder also lightened the concrete. Therefore, the study concluded that using waste glass powder in concrete is an effective way to increase sustainability while maintaining adequate performance properties.
This document discusses metakaolin, which is produced by calcining kaolin clay between 650-800°C. It has pozzolanic properties and can partially replace cement in high strength concrete. Metakaolin increases the strength and durability of concrete by reacting with calcium hydroxide to produce additional calcium-silicate-hydrate gel. It improves the physical and chemical properties of concrete, leading to applications in infrastructure like bridges, dams, and buildings where high strength and durability are important.
Final report on Behaviour of Geopolymer Concretechetansingh999
This document is a thesis submitted by Chetan Singh Pundeer to fulfill the requirements for a B.Tech degree in Civil Engineering from Lingaya's University. It involves a study of the behavior of geopolymer concrete. Chetan declares that the work is original and was carried out under the supervision of Utkarsh Yadav. The thesis acknowledges the guidance of Nazim Ali and assistance of Utkarsh Yadav. The abstract indicates that the study focuses on developing environmentally friendly geopolymer concrete using fly ash as a cement replacement and studying its durability when exposed to acids, sulfates and chlorides.
A report on use of waste plastic in concreteVed Jangid
The document appears to be a project report submitted by five students for their Bachelor of Technology degree. It investigates using plastic waste as a partial replacement for coarse aggregates in concrete. The report includes sections on materials testing, mix design, casting of test specimens, testing of compressive and flexural strength, and analysis of results. The overall aim is to study the suitability of using plastic waste in concrete and determine the impact on properties like strength.
Admixtures are added to concrete mixes to improve performance properties. Common types include plasticizers, superplasticizers, retarders, accelerators, and air-entraining admixtures. They allow reductions in water content or increases in workability. Trial mixes should be done to determine appropriate dosage for a given mix, as effect depends on cement and aggregates used. Admixtures improve qualities like strength, permeability, bleeding resistance, and durability in freezing environments.
Effect of coconut fibre in concrete and to improve thehsaam hsaam
This document discusses the use of coconut fibre in concrete. Coconut fibre is extracted from the outer shell of coconuts and is one of the most ductile and tough natural fibres. It has high tensile strength and is capable of withstanding strains 4-6 times more than other natural fibres. The objective of the study is to enhance the strength properties of concrete by adding coconut fibre. Different tests will be conducted on fresh and hardened concrete with coconut fibre added at various percentages to determine workability and strength properties. The study will also investigate the effect of incorporating a superplasticizer to improve workability of concrete containing coconut fibre.
This document investigates replacing cement with rice husk ash in concrete. An experiment was conducted replacing 20% of cement with rice husk ash. The compressive strength at 7, 14, 21, and 28 days with 20% replacement was found to compare favorably to concrete without replacement. Using rice husk ash provides benefits like reducing greenhouse gas emissions and construction costs while utilizing an agricultural waste. The results indicate rice husk ash is a suitable partial replacement for cement in concrete.
Mix Design of Grade M35 by Replacement of Cement with Rice Husk Ash in ConcreteDr. Amarjeet Singh
The optimized RHA, by controlled burn or
grinding, has been used as a pozzolanic material in cement
and concrete. Using it provides several advantages, such as
improved strength and durability properties, and
environmental benefits related to the disposal of waste
materials and to reduced carbon dioxide emissions. Up to
now, little research has been done to investigate the use of
RHA as supplementary material in cement and concrete
production .The main objective of this work is to study the
suitability of the rice husk ash as a pozzolanic material for
cement replacement in concrete. However it is expected that
the use of rice husk ash in concrete improve the strength
properties of concrete. Also it is an attempt made to develop
the concrete using rice husk ash as a source material for
partial replacement of cement, which satisfies the structural
properties of concrete like compressive strength.
Sustainable concrete uses less energy and produces fewer carbon emissions than regular concrete. It incorporates waste and recycled materials like fly ash and slag to replace portions of cement. Using these supplementary cementitious materials can increase sustainability by reducing embodied energy and carbon in the concrete. Sustainable strategies also include minimizing water use, using local and recycled aggregates, and designing for durability to lessen environmental impacts over the concrete's lifetime. The presentation outlined various approaches to sustainable concrete and its advantages in promoting greener construction.
This document summarizes a seminar presentation on rice husk ash (RHA). RHA is obtained by burning rice husks between 600-700 degrees Celsius for 2 hours. It is high in silica content and can be used to partially replace cement in concrete production. The addition of RHA increases strength and durability by reducing calcium hydroxide levels in concrete. It also reduces efflorescence and susceptibility to chemical and sulfate attacks. Using RHA in concrete can help reduce carbon dioxide emissions from cement production and provides an economic use for the agricultural waste product of rice husks. The seminar outlines the production, properties and advantages of using RHA in concrete.
This document discusses soil cement, which is a compacted mixture of soil/aggregate, Portland cement, and water. It is used as a low-cost pavement base material. The document outlines the raw materials, types, applications, performance advantages and disadvantages of soil cement. Some key points are that soil cement can strengthen failing granular base pavements in an efficient and economical way, and that it distributes loads well and resists damage from weather due to its rigid characteristics. However, it requires proper moisture levels and can crack over time.
This document summarizes different types of piles used in construction foundations including friction piles, end bearing piles, sheet piles, load piles, and more. It describes how piles can be made of timber, steel, concrete, or composites. The document also outlines various pile driving methods such as drop hammers, single/double acting steam hammers, diesel hammers, vibratory drivers, and safety procedures for pile driving operations.
Durability Studies on Concrete with Hypo Sludge as Partial Replacement of CementIJERA Editor
This paper summarizes the research work on the properties of hypo sludge when used as partial replacement for
Ordinary Portland Cement (OPC) in concrete. OPC was replaced with hypo sludge by weight at 0%, 5%, 10%,
15%, 20% and 25%. 0% replacement served as the control. Compacting factor test was carried out on fresh
concrete while Compressive Strength test was carried out on hardened 150mm concrete cubes after 7, 14 and 28
days curing in water. The results revealed that the Compacting factor decreased as the percentage replacement
of OPC with hypo sludge increased. The compressive strength of the hardened concrete also decreased with
increasing OPC replacement with hypo sludge. It is recommended that further studies be carried out to gather
more facts about the suitability of partial replacement of OPC with hypo sludge in concrete.
IRJET - Effect of Using Different Substitutes as Partial Replacement of Cemen...IRJET Journal
This document discusses a study on the effect of using different substitutes for partial replacement of cement and aggregate on the strength of concrete. Concrete cubes with M20 design mix were cast using fly ash, marble powder, M-sand and concrete waste to partially or fully replace cement and sand. The concrete cubes were tested after 28 days to determine their compressive strength. It was found that fly ash and marble powder can partially replace cement at 15% and 10-15% respectively without reducing strength. M-sand was found to increase strength even at 15% replacement of sand. Concrete waste also provided satisfactory strength when used to fully replace coarse aggregate and partially replace sand.
Studies on quarry dust as partial replacement of fine aggregates in concreteIJLT EMAS
Natural sand is most commonly used fine aggregates
in the production of concrete possess the problem of acute
shortage in many areas. Quarry dust can be used as an economic
alternative to the natural sand. In this investigation an attempt is
made to utilize quarry dust as a partial substitute for natural
sand in producing concrete. Natural sand is replaced by Quarry
dust at an interval of 5%, 10%, 15%, 20% and 25%. Mix
proportions for M20 concrete is prepared with reference to IS:
10262-2009 and IS: 456-2000 for the study of workability.
Compressive strength and Flexural strength test results are
compared with the conventional concrete. The strengths were
obtained at the ages of 3, 7 and 28 days. Compressive and
Flexural strength increased marginally from 5% to 15%
replacement. There is a slight decrease in the corresponding
compressive and flexural strength at 20% replacement. Good
correlation was observed between compressive strength and
flexural strength. It was observed that the addition of quarry
dust that would replace the fine material at particular
proportion has displayed an enhancing effect on properties of
concrete. This investigation proves that quarry dust can be used
as a partial substitute for natural sand in preparing concrete.
IRJET- Experimental Study on Partial Replacement of Cement by Fly Ash & Fine ...IRJET Journal
This study experimentally evaluated the strength characteristics of concrete with partial replacements of cement by fly ash and fine aggregate by foundry sand. Concrete cubes were cast with fly ash replacing cement at 0%, 10%, 20%, and 25% by weight and foundry sand replacing fine aggregate at 0%, 10%, 20%, 25%, and 30% by weight. The cubes were tested for compressive strength at 7 and 28 days. The optimum mix was found to be a 20% replacement of cement with fly ash and 20% replacement of fine aggregate with foundry sand, which achieved nearly 30% higher compressive strength than conventional concrete. Therefore, this study demonstrates the viability of using industrial byproducts like fly ash and foundry sand in concrete production.
IRJET- Experimental Investigation for Strength of Concrete by using Fly AshIRJET Journal
This document summarizes an experimental investigation into the strength of concrete when using fly ash. Fly ash from various sources was used to replace 25% of cement by weight or volume in mortar mixes. The mixes were tested at various water-to-binder ratios and cured for up to 90 days. Testing showed that early strength was lower with fly ash but most mixes recovered strength by 28 days. Finer fly ashes performed equal to or better than ordinary Portland cement after 28 days. The results indicate that fly ash can provide strength improvements to concrete while providing economic and environmental benefits over pure cement.
IRJET- A Review on “Partial Replacement of Cement and Fine Aggregate by Al...IRJET Journal
This document reviews research on using copper slag and artificial aggregate as partial replacements for cement and fine aggregate in concrete. It summarizes several studies that found:
1) Replacing 20% of cement and fine aggregate with copper slag and ceramic powder increased compressive strength by around 36%.
2) Replacing 40% of fine aggregate with copper slag increased compressive strength by 17.5% while maintaining workability.
3) Using 20% copper slag as a partial cement replacement achieved a compressive strength of 85% of a reference mix without copper slag.
4) Compressive strength increased up to a 80% replacement of fine aggregate with copper slag and ferrous slag.
“USE OF SILICA FUME AS A PARTIAL REPLACEMENT OF CEMENT IN CONCRETE”IRJET Journal
This document summarizes a study that investigated using silica fume to partially replace cement in concrete mixtures at percentages of 20%, 25%, and 30%. The study found that 7-day compressive strength decreased as the percentage of silica fume replacement increased. Rebound hammer tests indicated the concrete cubes were in the fair strength category. The study concluded that silica fume can contribute to hydration as a pozzolanic material and resulted in good compressive strengths, though 7-day strength decreased with higher replacement percentages.
IRJET- Utilization of Glass Powder and Fly Ash in Concrete Paver BlocksIRJET Journal
This document summarizes research on utilizing glass powder and fly ash in concrete paver blocks. Paver blocks were produced with varying replacements of cement with fly ash and manufacturing sand with glass powder. The blocks were tested for compressive strength, flexural strength, and water absorption. Test results found that replacing 30% of cement with fly ash and 30% of manufacturing sand with glass powder produced blocks with improved compressive strength, flexural strength, and lower water absorption, while also reducing costs. Utilizing these waste materials provides environmental and economic benefits for paver block production.
IRJET- Effect of Manufacturing Sand on Durability of ConcreteIRJET Journal
This document discusses a study on the effect of manufacturing sand on the durability of concrete. Concrete mixtures of M20 and M40 grade were produced by replacing natural sand with 0%, 50%, 70%, and 100% manufacturing sand. Various tests were performed to determine the hardened properties and durability of the concrete mixtures. The compressive strength of the concrete mixtures was tested at curing ages of 3, 7, and 28 days. The results showed that 100% replacement of natural sand with manufacturing sand increased the 28-day compressive strength of M20 grade concrete by over 30%. For M40 grade concrete, 50% replacement of natural sand with manufacturing sand increased the compressive strength at all ages compared to the control mixture. In
The document discusses a study on the behavior of beams made with concrete where 10% of the coarse aggregate is replaced with waste rubber. Beams were cast with normal concrete and rubberized concrete. The rubberized concrete beams were tested and their load vs deflection behavior, initial cracking load, ultimate load, and stress-strain curves were compared to normal concrete beams. The results showed that using 10% rubber replacement led to an up to 10% reduction in ultimate load capacity but higher initial cracking loads. Thus, partially replacing coarse aggregate with waste rubber can help utilize waste while maintaining much of the strength of normal concrete.
Partial Replacement of Cement with brick Dust in concreteIRJET Journal
This document investigates partially replacing cement with brick dust in concrete. Three replacement levels of cement with brick dust were tested: 5%, 10%, and 15%. Tests on the concrete mixtures found that workability increased with brick dust replacement, with slump increasing from 28mm in normal concrete to 29mm with 15% replacement. Compressive strength was found to decrease with higher replacement levels, with 5% replacement showing similar 7-day and 28-day strengths to normal concrete, 10% replacement showing a minor strength reduction, and 15% replacement reducing strength by over 17% at 28 days. The document concludes that brick dust can replace up to 10% of cement to gain workability benefits without significant strength loss.
This document discusses a study on the use of sawdust as a partial replacement for sand in concrete. Sawdust was used to replace 10%, 20%, and 30% of the sand by weight in M20 grade concrete mixes. Concrete cubes were cast and tested for compressive strength at 7 and 28 days. The results showed that concrete with a 30% replacement of sand with sawdust achieved compressive strengths of 12.6 MPa at 7 days and 18.7 MPa at 28 days, meeting the target strength for M20 concrete. Using sawdust as a partial replacement for sand up to 30% was found to be feasible for concrete production while providing an economical and environmentally friendly use of sawdust
The document discusses a study that investigated using quarry dust as a partial replacement for coarse aggregates in concrete. Concrete cubes were made with 0-25% replacement of gravel with quarry dust. Testing found that replacing 10% of gravel with quarry dust and using Ibeto cement yielded the highest compressive strength of 32.3N/mm2. Strengths were satisfactory up to 15% replacement when using Dangote cement. This suggests quarry dust can partially replace coarse aggregates at certain replacement levels while still achieving adequate strength. However, properties of different cement brands can impact concrete strengths made with quarry dust.
Effect on Concrete Strength by Partial Replacement of Cement with Cotton Stal...ijtsrd
Huge quantity of Cotton stalk ash and rice husk ash are generating as a waste product in agriculture sector in India and many other developing countries every year. In lack of proper wakefulness and technology expansion, great portion of these by products remain unutilized causing severe disposal and environmental troubles. The main goal of this thesis is to examine the performance of M40 grade concrete with a mix ratio as per M40 grade and a water cement ratio of 0.425 Additionally, it aims to determine the compressive strength, flexural strength, and split tensile strength of concrete cement when cotton stalk ash and rice husk ash are used in place of cement. With various percentage like 10, 20, and 30 etc. of cotton stalk ash and rice husk ash well as with combined replacement of Cotton stalk ash and rice husk ash. and results that the workability of concrete was found to be reduced on enhance the Cotton stalk ash CSA , rice husk ash RHA by difference percentages. The Maximum increase in 53.67 N mm2 of compressive strength is obtained after the period 28 days with cotton stalk ash substituting 10 of the cement CSA . The maximum increase in flexural strength over the period of 28 days was 5.98 N mm2, with cotton stalk ash substituting 10 of the cement CSA . When 10 of the cement is replaced with cotton stalk ash, the significant increase in split tensile strength for 28 days is 4.23N mm2 CSA By substituting cotton stalk ash, rice husk ash for 20, 10 of the cement, the compressive strength as per this investigations for 28 days is observed 49.47 N mm2 CSA, RHA is not achieved highest value but achieve the target mean strength. The greatest results are achieved when cotton stalk ash are utilized, although at different percentages. Maninder Singh | Mr. Janardan Tiwari "Effect on Concrete Strength by Partial Replacement of Cement with Cotton Stalk Ash and Rice Husk Ash" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-7 , December 2022, URL: https://www.ijtsrd.com/papers/ijtsrd52353.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/52353/effect-on-concrete-strength-by-partial-replacement-of-cement-with-cotton-stalk-ash-and-rice-husk-ash/maninder-singh
An Experimental Investigation on Strengths Characteristics of Concrete with t...IJERA Editor
This document presents an experimental investigation on the strengths characteristics of concrete with partial replacements of cement by marble powder dust and sand by stone dust. Marble powder is used to replace cement by 0%, 5%, 10%, 15%, and 20% by weight, and stone dust is used to replace sand by 10%, 20%, and 30% along with 0%, 10%, and 20% cement replacement by marble powder. Compressive, flexural, and split tensile strengths are tested at 7 and 28 days of curing. The results indicate that marble powder replacement up to 10% improves compressive, flexural, and split tensile strengths. Stone dust and marble powder replacements up to 20% and 10% respectively also improve compressive
1) The document studies the use of marble powder as a partial replacement for cement in normal compacting concrete.
2) Five concrete mixes were tested with 0%, 5%, 10%, 15%, and 20% replacement of cement with marble powder to determine compressive, split tensile, and flexural strengths at 7, 28, and 56 days.
3) The results showed that compressive, split tensile, and flexural strengths generally increased up to 10% replacement of cement with marble powder compared to the normal mix without replacement. Higher replacements of 15% and 20% typically showed reduced strengths compared to the 10% replacement mix.
IRJET - An Experimental Investigation on Concrete with of Partial Replacement...IRJET Journal
1. The document presents the results of an experimental investigation on the use of hypo sludge as a partial replacement for cement in concrete.
2. Hypo sludge, a waste product from paper mills, was used to replace cement at levels of 5%, 10%, and 15% by weight.
3. Concrete mixtures were tested to determine their compressive strength, flexural strength, and other properties at curing periods of 7 and 28 days.
4. The test results showed that concrete with a 5% replacement of cement with hypo sludge achieved strengths close to that of normal concrete, indicating hypo sludge's potential as a supplementary cementitious material.
EXPERIMENTAL STUDY ON THE BEHAVIOR OF CONCRETE BY PARTIAL REPLACEMENT OF CEME...IRJET Journal
This document summarizes an experimental study that partially replaced cement with groundnut shell ash (GSA) and fine aggregate with granite powder in concrete mixes. The study aimed to evaluate the effects on compressive, flexural, and split tensile strengths at curing periods of 3, 14, and 28 days. Testing found that for a 32% replacement of cement with GSA and 24% replacement of fine aggregate with granite powder, the concrete showed positive results with strengths within specifications. Workability was reduced with increased replacement percentages of GSA and granite powder. The study concluded the maximum replacement proportions that provided adequate strengths were 32% GSA and 24% granite powder.
Size Anddosageof Micro Silica Fume Behaviour for Partial Replacement of Cemen...iosrjce
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of mechanical and civil engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in mechanical and civil engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
This study investigated the engineering properties of fly ash concrete for rigid pavement construction. Concrete cubes and beams were prepared with 0%, 10%, 20%, 30%, and 40% fly ash replacement of cement by weight. The specimens were tested for compressive strength, flexural strength, and workability at various ages. Results showed that compressive and flexural strength increased up to 30% fly ash replacement, with the highest 28-day compressive strength of 45.95 MPa. Workability decreased with increasing fly ash content. The study concluded that 30% fly ash replacement provided superior performance while reducing cement costs and waste.
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our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
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Use of Saw Dust Ash as Partial Replacement for Cement In Concrete
1. International Journal of Engineering Science Invention
ISSN (Online): 2319 – 6734, ISSN (Print): 2319 – 6726
www.ijesi.org Volume 3 Issue 8 ǁ August 2014 ǁ PP.36-40
www.ijesi.org 36 | Page
Use of Saw Dust Ash as Partial Replacement for Cement In Concrete Obilade, I. O. Department of Civil Engineering, Osun State Polytechnic, Iree, Nigeria ABSTRACT : This paper presents the results of the investigation carried out on the use of Saw Dust Ash (SDA) as partial replacement for Ordinary Portland Cement (OPC) in concrete. SDA was used to replace OPC by weight from 0 to 30% in steps of 5%. Compacting factor test was carried out on fresh concrete while compressive strength test was carried out on 150mm concrete cubes after 7, 14 and 28 days curing in water. The results revealed that the Compacting factor decreased as the percentage replacement of OPC with SDA increased. The compressive strength of the hardened concrete also decreased with increasing OPC replacement with SDA. It is recommended that studies on long term strength and durability be carried out to ascertain more facts about the suitability of the use of SDA as a pozzolan in concrete. KEYWORDS: Concrete, Saw Dust Ash, Compacting factor, Compressive Strength
I. INTRODUCTION
Portland cement as an ingredient in concrete is one of the main construction materials widely used especially in developing countries. The increasing demand for cement is expected to be met by partial cement replacement (Coutinho, 2003). The search for alternative binder or cement replacement materials led to the discovery of potentials of using industrial by-products and agricultural wastes as cementitious materials. If these fillers have pozzolanic properties, they impart technical advantages to the resulting concrete and also enable larger quantities of cement replacement to be achieved (Hossain, 2003). Studies by Arikan, (2004) and Turanli et al. (2004) indicate that substantial energy and cost savings can result when industrial by-products are used as a partial replacement for the energy intensive Portland cement. The presence of mineral admixtures from agricultural waste is also known to impart significant improvement in workability and durability of concrete. Although, technological and economic benefits are the main reasons for the use of mineral additions, Genezzini et al. (2003) observed that the prevention of environment contamination by means of proper waste disposal is an added advantage. The use of industrial and agricultural by-product in cement production is an environmental friendly method of disposal of large quantities of materials that would otherwise pollute land, water and air. Some of the waste products which possess pozzolanic properties and which have been studied for use in blended cements include fly ash (Wang et al., 2008), Silica fume (Lee et al., 2005), Volcanic ash (Hossain, 2005), Rice husk ash (Akeke et al.., 2013; Rajput et al., 2013), Corn Cob Ash (Raheem et al., 2010; Raheem and Adesanya, 2011).Saw dust is a waste material resulting from the mechanical milling or processing of timber into various shapes and sizes. The dust is usually used as domestic fuel. The resulting ash known as Saw Dust Ash (SDA) is a form of pozzolan. Saw dust is in abundance in Nigeria and other parts of the world. The need to convert this waste product into a construction product is the focus of this study.Elinwa and Ejeh (2004) considered the effect of the incorporation of waste incineration fly ash (SWIFA) in cement pastes and mortar. Cheah and Ramli (2011) investigated the implementation of wood waste ash as a partial cement replacement material in the production of structural grade concrete and mortar. Elinwa et al. (2008) assessed the fresh concrete properties of self-compacting concrete containing Saw Dust Ash. Elinwa and Mahmoodb (2002) considered ash from timber waste as cement replacement material. This research work examined the use of Saw Dust Ash as partial replacement for Ordinary Portland Cement in concrete. It invoved the determination of workability and compressive strength of the concrete at different level of replacement.
II. MATERIALS AND METHODS
Materials Saw Dust Ash (SDA):The Saw Dust used was obtained from Iree, Nigeria. After collection, the sawdust was openly heated. The ash was ground to the required level of fineness and sieved through 600μm sieve in order to remove any impurity and larger size particles.
2. Use Of Saw Dust Ash As Partial Replacement...
www.ijesi.org 37 | Page
Coarse Aggregate :The granite used for this research work was 12mm size. It was sourced from a quarry in Igbajo in Nigeria Fine Aggregate : The sand used for this research work was sourced from Iree, Osun state, Nigeria. The impurities were removed and it conformed to the requirements of BS 882 (1992). Cement : The cement used was Ordinary Portland Cement. It was sourced from Iree, Osun State, Nigeria and it conformed to the requirements of BS EN 197-1: 2000. Water : The water used for the study was obtained from a free flowing stream. The water was clean and free from any visible impurities. It conformed to BS EN 1008 (2002) requirements. Batching and mixing of materials : Batching of materials was done by weight. The percentage replacements of Ordinary Portland cement (OPC) by Saw Dust Ash (SDA) were 0%, 5%, 10%, 15%, 20%, 25% and 30%. The 0% replacement was to serve as control for other samples. Concrete Mix Design : The concrete used in this research work was made using Binder, Sand and Gravel. The concrete mix proportion was 1:2:4 by weight. Casting of samples :Cubic specimens of concrete with size 150 x 150 x 150 mm were cast for determination of all measurements. Seven mixes were prepared using different percentages of 0, 5, 10, 15, 20, 25 and 30 SDA. The concrete was mixed, placed and compacted in three layers. The samples were demoulded after 24 hours and kept in a curing tank for 7, 14 and 28 days as required. The Compacting Factor apparatus was also used to determine the compacting factor values of the fresh concrete in accordance with BS 1881: Part 103 (1983). Testing of samples :The compressive tests on the concrete cubes were carried out with the COMTEST Crushing Machine at The Sammya Construction Company, Osogbo, Nigeria. This was done in accordance with BS 1881: Part 116 (1983). The sample was weighed before being put in the compressive test machine. The machine automatically stops when failure occurs and then displays the failure load.
III. RESULTS AND DISCUSSIONS
Results of compacting factor test on fresh concrete samples The results obtained from the compacting factor test on fresh concrete samples are given in Table I. Table I: Compacting factor values of SDA concrete
Percentage replacement of SDA (%)
Compacting Factor values
0
0.91
5
0.89
10
0.88
15
0.87
20
0.86
25
0.86
30
0.85
The table indicates that the compacting factor values reduce as the SDA content increases. The compacting factor values reduced from 0.91 to 0.85 as the percentage SDA replacement increased from 0% to 30%. These results indicate that the concrete becomes less workable (stiff) as the SDA percentage increases meaning that more water is required to make the mixes more workable. The high demand for water as the SDA content increases is due to increased amount of silica in the mixture. This is typical of pozzolan cement concrete as the silica-lime reaction requires more water in addition to water required during hydration of cement (Bui et al. 2005). Bulk Densities of Concrete Cubes
3. Use Of Saw Dust Ash As Partial Replacement...
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The Bulk Densities of the Concrete Cubes cast at various days of curing are shown in Table II and Figure 1. Table II. Bulk Densities of Concrete Cubes with various percentages of SDA
Saw Dust Ash Replacement (%)
BulkDensity(g/cm3)
7 days
14 days
28 days
0
2.32
2.37
2.43
5
2.27
2.29
2.31
10
2.21
2.22
2.25
15
2.19
2.20
2.22
20
2.19
2.20
2.20
25
2.18
2.18
2.19
30
2.17
2.18
2.19
Figure 1: Effect of SDA content on Bulk Density of Concrete at different curing age The results of the bulk densities show that the bulk density reduces as the percentage SDA increases. This could be attributed to the increase in voids in the concrete cubes as the percentage SDA increases. However, the bulk densities increase as the number of days of curing increase as the concrete cubes become denser. Results of Compressive Strength Tests on Concrete Cubes : The results of the compressive strength tests on concrete cubes are shown in Table III and Figure 2 Table III: Compressive Strength of Concrete Cubes with various percentages of SDA
Saw Dust Ash Replacement (%)
Compressive Strength (N/mm2)
7 days
14 days
28 days
0
17.51
21.60
29.15
5
17.23
17.85
21.02
10
16.89
16.96
20.64
15
14.38
15.87
19.05
20
10.59
11.63
13.56
25
9.35
9.83
12.42
30
7.02
7.61
10.19
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Figure 2: Effect of SDA content on Compressive Strength of concrete at different curing age The results of the compressive strength of concrete cubes show that the compressive strengths reduced as the percentage SDA increased. However, the compressive strengths increased as the number of days of curing increased for each percentage SDA replacement.It is seen from Table III that for the control cube, the compressive strength increased from 17.51 N/mm2 at 7 days to 29.15 N/mm2 at 28 days (i.e. about 66% increment). The 28 day strength was above the specified value of 25N/mm2 for grade 25 concrete (BS 8110, 1997) as shown in Table 4. The strength of the 5% replacement by sawdust ash showed increase in compressive strength from 17.23 N/mm2 at 7 days to 21.02 N/mm2 at 28 days (22% increment).The 28 day strength was above the specified value of 20N/mm2 for grade 20 concrete (BS 8110, 1997) as shown in Table 4. The strength of the 10% replacement by sawdust ash showed increase in compressive strength from 16.89 N/mm2 at 7 days to 20.64 N/mm2 at 28 days (22% increment).The 28 day strength was above the specified value of 20N/mm2 for grade 20 concrete (BS 8110, 1997) as shown in Table IV.The strength of the 15% replacement by sawdust ash showed increase in compressive strength from 14.38 N/mm2 at 7 days to 19.05 N/mm2 at 28 days (32% increment).The 28 day strength was above the specified value of 15N/mm2 for light weight concrete (BS 8110, 1997) as shown in Table 4. Table IV: Recommended grade of concrete (BS 8110, 1997)
Grade
Characteristic strength
Concrete class
7 10
7.0 10.0
Plain concrete
15
15.0
Reinforced concrete with lightweight aggregate
20 25
20.0 25.0
Reinforced concrete with dense aggregate
30
30.0
Concrete with post tensioned tendons
40 50 60
40.0 50.0 60.0
Concrete with pre tensioned tendons
IV. CONCLUSIONS
From the investigations carried out, the following conclusions can be made: The optimum addition of SDA as partial replacement for cement is in the range 0-15%. The compacting factor values of the concrete reduced as the percentage of SDA increased. The Bulk Densities of concrete reduced as the percentage SDA replacement increased. The Compressive Strengths of concrete reduced as the percentage SDA replacement increased.
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V. RECOMMENDATIONS
The following are recommended from this study: The use of local materials like SDA as pozzolans should be encouraged in concrete production. Similar studies are recommended for concrete beams and slab sections to ascertain the flexural behaviour of lightweight concrete made with this material. Durability studies of concrete cubes made with SDA as partial replacement for cement should be carried out. REFERENCES
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