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.
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
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.
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.
Evaluation of durability properties of recycled aggregate concrete incorporat...IEI GSC
Presentation on Evaluation of durability properties of recycled aggregate concrete incorporating flyash and silica fume by Parth Patel, Guided by Dr Urmil Dave & Prof Tejas Joshi, Nirma University, Ahmedabad at #33NCCE 33rd National Convention of Civil Engineers at #IEIGSC
An Experimental Investigation on Strength Characteristics of Concrete with Pa...ijsrd.com
One of the approaches in improving the durability of concrete is to use blended cement materials such as fly ash, silica fume, slag and more recently, metakaolin. By changing the chemistry and microstructure of concrete, pozzolans reduce the capillary porosity of the cementitious system and make them less permeable to exterior chemical sources as well as reducing the internal chemical incompatilities such as alkali-silica reaction. The concrete industry is known to leave an enormous environmental footprint on Planet Earth. First, there are the sheer volumes of material needed to produce the billions of tons of concrete worldwide each year. Then there are the CO2 emissions caused during the production of Portland cement. Together with the energy requirements, water consumption and generation of construction and demolition waste, these factors contribute to the general appearance that concrete is not particularly environmentally friendly or compatible with the demands of sustainable development. Thus, use of these supplementary cementitious materials can reduce the effects of cement causing severe environmental impact. This study presents the results of different mechanical properties of concrete such as compressive strength, split tensile strength and flexural concrete by partially replacing cement with metakaolin and silica fume. The replacement of metakaolin is varied from 10%, 15%, 20% and 25% and silica fume from 6%, 8% and 10%. The property of concrete in fresh state that is the workability is also studied during the present investigation. The optimum doses of silica fume and metakaolin in combination were found to be 6% and 15% (by weight) respectively, when used as part replacement of ordinary Portland cement.
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
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.
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.
Evaluation of durability properties of recycled aggregate concrete incorporat...IEI GSC
Presentation on Evaluation of durability properties of recycled aggregate concrete incorporating flyash and silica fume by Parth Patel, Guided by Dr Urmil Dave & Prof Tejas Joshi, Nirma University, Ahmedabad at #33NCCE 33rd National Convention of Civil Engineers at #IEIGSC
An Experimental Investigation on Strength Characteristics of Concrete with Pa...ijsrd.com
One of the approaches in improving the durability of concrete is to use blended cement materials such as fly ash, silica fume, slag and more recently, metakaolin. By changing the chemistry and microstructure of concrete, pozzolans reduce the capillary porosity of the cementitious system and make them less permeable to exterior chemical sources as well as reducing the internal chemical incompatilities such as alkali-silica reaction. The concrete industry is known to leave an enormous environmental footprint on Planet Earth. First, there are the sheer volumes of material needed to produce the billions of tons of concrete worldwide each year. Then there are the CO2 emissions caused during the production of Portland cement. Together with the energy requirements, water consumption and generation of construction and demolition waste, these factors contribute to the general appearance that concrete is not particularly environmentally friendly or compatible with the demands of sustainable development. Thus, use of these supplementary cementitious materials can reduce the effects of cement causing severe environmental impact. This study presents the results of different mechanical properties of concrete such as compressive strength, split tensile strength and flexural concrete by partially replacing cement with metakaolin and silica fume. The replacement of metakaolin is varied from 10%, 15%, 20% and 25% and silica fume from 6%, 8% and 10%. The property of concrete in fresh state that is the workability is also studied during the present investigation. The optimum doses of silica fume and metakaolin in combination were found to be 6% and 15% (by weight) respectively, when used as part replacement of ordinary Portland cement.
DURABILITY STUDIES OF GGBS AND METAKAOLIN BASED GEOPOLYMER CONCRETE Ijciet 08...IAEME Publication
The objective of this research work was to produce a carbon dioxide emission free cementious
material. The geopolymer concrete is such a vital and promising one. In this study, geopolymer is
prepared from ‘Ground Granulated Blast Furnace Slag’ (GGBS) a powder from grinding the byproduct
of slag waste from blast furnace of steel plants and metakaolin from industry. The Alkaline
liquids used in this study for the polymerization process are the solutions of sodium hydroxide
(NaoH) and sodium silicate (Na2Sio3).A 8 Molarity and 10 Molarity solutions was taken to prepare
the mix. The cube compressive strength was calculated for different mixes. The cube specimens are
taken of size 150 mm x 150 mm x 150 mm. Ambient curing of concrete at room temperature was
adopted. In total 180 cubes were casted for their compressive strength at age of 28 days
respectively. The test data indicate that on exposure to 5% Sodium Sulphate, Sulphuric Acid and
Sodium Chloride, the losses in weight, and strength of geopolymer concrete (GPC) are
significantly much less than those for cement concrete. Thus the geopolymer concrete is considered
to be an environmentally pollution free construction material.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
An Experimental Study on Durability of Concrete Using Fly Ash & GGBS for M30 ...IJERD Editor
Concrete when subjected to severe environments its durability can significantly decline due to
degradation. Degradation of concrete structures by corrosion is a serious problem and has major economic
implications. In this study, an attempt has been made to study the durability of concrete using the mineral
admixtures like Fly Ash & Ground Granulated Blast Furnace Slag (GGBS) for M30 grade concrete.Cube
Specimens were casted and are immersed in normal water, sea water, H2SO4 of various concentrations and were
tested after 7 days, 28 days & 60 days.
Experimental Study on Durability Characteristics of High Performance Concrete...theijes
High performance concrete (HPC) is developed gradually over the last 15 years with respect to production of concrete with higher and higher strength. To enhance the properties such as durability, strength, workability, economy has increased due to the usage of mineral admixtures in making high performance concrete. The scope of the present study is to investigate the effect of mineral admixtures and by-products towards the performance of HPC. An effort has been made to concentrate on the mineral admixture of silica fume towards their pozzolanic reaction and industrial by-product of bottom ash and steel slag towards their hydration reaction can be contributed towards their strength and durability properties. The strength characteristics such as compressive strength, tensile strength and flexural strength were investigated to find the optimum replacement of mineral admixture and by-product admixture. HPC with mineral admixture of silica fume at the replacement levels of 0%, 5%, 10%, 15% & 20% were studied at the age of 28 days and industrial by-products of bottom ash and steel slag aggregate at the replacement level of 10%, 20%, 30%, 40% & 50% were studied at the age of 28 days. There were a total of 15 mixes created with different material contents. Out of 14 were HPC mixes and 1 were conventional concrete mixes. Finally strength has enhanced with the mix of silica fume can replaced by cement with 5% and bottom ash and steel slag can replaced by fine and coarse aggregate with 10% can be achieved higher strength when compared with other percentage of mixes. The combination mixes can be classified as binary and ternary mixes. Binary mixes involved combinations of silica fume and bottom ash (SF+BA), silica fume and steel slag aggregate (SF+SSA), bottom ash and steel slag aggregate (BA+SSA) and Ternary mixes involved combination of three materials such as silica fume, bottom ash and steel slag aggregate (SF+BA+SSA) in High performance concrete. The investigation revealed that the combined use of silica fume, bottom ash and steel slag aggregate improved the mechanical properties of HPC and thus there 3 materials may use as a partial replacement material in making HPC. The durability studies such as acid resistance, salt resistance, sulphate resistance & water absorption were conducted. From the experimental investigation, it was observed that mineral admixture of silica fume and industrial by-products of bottom ash & steel slag aggregate plays a vital role in improving the strength and durability parameter itself.
An Experimental Investigation on Strength Behavior of Concrete by Replacing N...ijsrd.com
Concrete is one of the most widely used construction material in the world. Destruction of concrete structure due to natural calamities like earthquake, tsunami or by the bombardment, it has became a major problem in finding place for dumping the concrete debris particularly in urban areas. This paper deals with the study of strength of concrete incorporating Recycled Aggregate concrete. The main objectives of this investigation is to find out up to what percentage the Natural Coarse Aggregate (N.C.A) can be replaced by R.C.A in the concrete mix and to find out the extra quantity of cement to be added for each percentage replacement by R.C.A to achieve its target mean strength A series of test were carried out to determine the compressive strength, split tensile strength, flexural strength with and without recycled aggregates. Natural coarse aggregates in concrete were replaced with 0%, 20%, 40%, 60%, 80% and 100% of crushed concrete coarse aggregate. For the strength characteristics, the result showed a gradual decrease in compressive strength, split tensile strength, flexural and modulus of elasticity as the percentage of recycled aggregate is increased.
Experimental Study on Partial Replacement of Cement by Flyash and GGBSijsrd.com
This paper presents a laboratory investigation on optimum level of Fly ash and Ground Granulated Blast Furnace Slag (GGBS) as a partial replacement of cement to study the strength characteristics of concrete. Portland cement was partially replaced by 5%, 6%, 7%, 8%, 9%, 10% of GGBS and Fly ash by 20%, 40%, 60% respectively. The water to cementations materials ratio was maintained at 0.45 for all mixes. The strength characteristics of the concrete were evaluated by conducting Compressive strength test, Splitting Tensile strength test and Flexural strength test. The compression strength test were conducted for 7days and 28days of curing and split tensile strength test and flexural strength test were conducted for 28days of curing on a M25 grade concrete. The mix proportion M25 was found to be 1:1.36:2.71.The test results proved that the compressive strength, split tensile strength and flexural strength of concrete mixtures containing GGBS and Fly ash increases as the amount of GGBS and Fly ash increase. After an optimum point, at around 9% of GGBS and 40% of Fly ash of the total binder content, the further addition of GGBS and fly ash does not improve the compressive strength, split tensile strength and flexural strength.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
EFFECT OF SILICA FUME ON RHEOLOGY AND MECHANICAL PROPERTY OF SELF COMPACTING ...IAEME Publication
The usage of an extensive group of industrial mineral residues (silica fume and fly ash) and other products significantly increases the rheological performance of concrete. This research is supposed to take a look at Rheology and Strengthened Properties of Self Compacting Concrete with Silica fume. This examination commenced with 4 groups of Self Compacting Concrete changed with diverse probabilities of Silica fume (5%, 10%,15%, and 20%). The rheological properties of self-compacting concrete are investigated experimentally using the slump flow diameter, the U box test, the V funnel test, and the L box test. Compressive strength and flexural strength are the strengthened properties experimentally examined. In this study, we observed the suitable percent of silica fume, which offers advanced rheological characteristics of Self Compacting Concrete as equated to Conventional Self Compacting Concrete. Our experimental results show, by the replacing 15% of silica fume with the weight of cement will increase both Rheological Properties and strengthened Properties of SCC.
EXPERIMENTAL INVESTIGATION OF DURABILITY TEST ON POLYMER CONCRETE(PCAshik97
Polymer concretes are a type of concrete that use polymers to replace lime-type cements as a binder.
The polymer is used in addition to portland cement to form Polymer Cement Concrete (PCC).
The composites do not contain hydrated cement phase,although Portland cement used as an aggregate or filler.
EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF POLYMERCONCRETEAshik97
The high amount of epoxy resin cause not only the high cost of monomer in Polymer concrete but also some drawbacks when sustainable development for repair works is considered.
The production of cement increases the content of CO2, which impacts on global warming. In this respect, using the chemical(monomer) can be an attractive alternative.
Elimination of Water in Polymer concrete tends to have best scope in the water scarce Areas
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.
We looked at the data. Here’s a breakdown of some key statistics about the nation’s incoming presidents’ addresses, how long they spoke, how well, and more.
My books- Hacking Digital Learning Strategies http://hackingdls.com & Learning to Go https://gum.co/learn2go
Resources at http://shellyterrell.com/emoji
DURABILITY STUDIES OF GGBS AND METAKAOLIN BASED GEOPOLYMER CONCRETE Ijciet 08...IAEME Publication
The objective of this research work was to produce a carbon dioxide emission free cementious
material. The geopolymer concrete is such a vital and promising one. In this study, geopolymer is
prepared from ‘Ground Granulated Blast Furnace Slag’ (GGBS) a powder from grinding the byproduct
of slag waste from blast furnace of steel plants and metakaolin from industry. The Alkaline
liquids used in this study for the polymerization process are the solutions of sodium hydroxide
(NaoH) and sodium silicate (Na2Sio3).A 8 Molarity and 10 Molarity solutions was taken to prepare
the mix. The cube compressive strength was calculated for different mixes. The cube specimens are
taken of size 150 mm x 150 mm x 150 mm. Ambient curing of concrete at room temperature was
adopted. In total 180 cubes were casted for their compressive strength at age of 28 days
respectively. The test data indicate that on exposure to 5% Sodium Sulphate, Sulphuric Acid and
Sodium Chloride, the losses in weight, and strength of geopolymer concrete (GPC) are
significantly much less than those for cement concrete. Thus the geopolymer concrete is considered
to be an environmentally pollution free construction material.
RESIDUAL COMPRESSIVE STRENGTH OF TERNARY BLENDED CONCRETE AT ELEVATED TEMPERA...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in the concrete manifests in the form of cracking and
spalling of the concrete surface.
An Experimental Study on Durability of Concrete Using Fly Ash & GGBS for M30 ...IJERD Editor
Concrete when subjected to severe environments its durability can significantly decline due to
degradation. Degradation of concrete structures by corrosion is a serious problem and has major economic
implications. In this study, an attempt has been made to study the durability of concrete using the mineral
admixtures like Fly Ash & Ground Granulated Blast Furnace Slag (GGBS) for M30 grade concrete.Cube
Specimens were casted and are immersed in normal water, sea water, H2SO4 of various concentrations and were
tested after 7 days, 28 days & 60 days.
Experimental Study on Durability Characteristics of High Performance Concrete...theijes
High performance concrete (HPC) is developed gradually over the last 15 years with respect to production of concrete with higher and higher strength. To enhance the properties such as durability, strength, workability, economy has increased due to the usage of mineral admixtures in making high performance concrete. The scope of the present study is to investigate the effect of mineral admixtures and by-products towards the performance of HPC. An effort has been made to concentrate on the mineral admixture of silica fume towards their pozzolanic reaction and industrial by-product of bottom ash and steel slag towards their hydration reaction can be contributed towards their strength and durability properties. The strength characteristics such as compressive strength, tensile strength and flexural strength were investigated to find the optimum replacement of mineral admixture and by-product admixture. HPC with mineral admixture of silica fume at the replacement levels of 0%, 5%, 10%, 15% & 20% were studied at the age of 28 days and industrial by-products of bottom ash and steel slag aggregate at the replacement level of 10%, 20%, 30%, 40% & 50% were studied at the age of 28 days. There were a total of 15 mixes created with different material contents. Out of 14 were HPC mixes and 1 were conventional concrete mixes. Finally strength has enhanced with the mix of silica fume can replaced by cement with 5% and bottom ash and steel slag can replaced by fine and coarse aggregate with 10% can be achieved higher strength when compared with other percentage of mixes. The combination mixes can be classified as binary and ternary mixes. Binary mixes involved combinations of silica fume and bottom ash (SF+BA), silica fume and steel slag aggregate (SF+SSA), bottom ash and steel slag aggregate (BA+SSA) and Ternary mixes involved combination of three materials such as silica fume, bottom ash and steel slag aggregate (SF+BA+SSA) in High performance concrete. The investigation revealed that the combined use of silica fume, bottom ash and steel slag aggregate improved the mechanical properties of HPC and thus there 3 materials may use as a partial replacement material in making HPC. The durability studies such as acid resistance, salt resistance, sulphate resistance & water absorption were conducted. From the experimental investigation, it was observed that mineral admixture of silica fume and industrial by-products of bottom ash & steel slag aggregate plays a vital role in improving the strength and durability parameter itself.
An Experimental Investigation on Strength Behavior of Concrete by Replacing N...ijsrd.com
Concrete is one of the most widely used construction material in the world. Destruction of concrete structure due to natural calamities like earthquake, tsunami or by the bombardment, it has became a major problem in finding place for dumping the concrete debris particularly in urban areas. This paper deals with the study of strength of concrete incorporating Recycled Aggregate concrete. The main objectives of this investigation is to find out up to what percentage the Natural Coarse Aggregate (N.C.A) can be replaced by R.C.A in the concrete mix and to find out the extra quantity of cement to be added for each percentage replacement by R.C.A to achieve its target mean strength A series of test were carried out to determine the compressive strength, split tensile strength, flexural strength with and without recycled aggregates. Natural coarse aggregates in concrete were replaced with 0%, 20%, 40%, 60%, 80% and 100% of crushed concrete coarse aggregate. For the strength characteristics, the result showed a gradual decrease in compressive strength, split tensile strength, flexural and modulus of elasticity as the percentage of recycled aggregate is increased.
Experimental Study on Partial Replacement of Cement by Flyash and GGBSijsrd.com
This paper presents a laboratory investigation on optimum level of Fly ash and Ground Granulated Blast Furnace Slag (GGBS) as a partial replacement of cement to study the strength characteristics of concrete. Portland cement was partially replaced by 5%, 6%, 7%, 8%, 9%, 10% of GGBS and Fly ash by 20%, 40%, 60% respectively. The water to cementations materials ratio was maintained at 0.45 for all mixes. The strength characteristics of the concrete were evaluated by conducting Compressive strength test, Splitting Tensile strength test and Flexural strength test. The compression strength test were conducted for 7days and 28days of curing and split tensile strength test and flexural strength test were conducted for 28days of curing on a M25 grade concrete. The mix proportion M25 was found to be 1:1.36:2.71.The test results proved that the compressive strength, split tensile strength and flexural strength of concrete mixtures containing GGBS and Fly ash increases as the amount of GGBS and Fly ash increase. After an optimum point, at around 9% of GGBS and 40% of Fly ash of the total binder content, the further addition of GGBS and fly ash does not improve the compressive strength, split tensile strength and flexural strength.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
EFFECT OF SILICA FUME ON RHEOLOGY AND MECHANICAL PROPERTY OF SELF COMPACTING ...IAEME Publication
The usage of an extensive group of industrial mineral residues (silica fume and fly ash) and other products significantly increases the rheological performance of concrete. This research is supposed to take a look at Rheology and Strengthened Properties of Self Compacting Concrete with Silica fume. This examination commenced with 4 groups of Self Compacting Concrete changed with diverse probabilities of Silica fume (5%, 10%,15%, and 20%). The rheological properties of self-compacting concrete are investigated experimentally using the slump flow diameter, the U box test, the V funnel test, and the L box test. Compressive strength and flexural strength are the strengthened properties experimentally examined. In this study, we observed the suitable percent of silica fume, which offers advanced rheological characteristics of Self Compacting Concrete as equated to Conventional Self Compacting Concrete. Our experimental results show, by the replacing 15% of silica fume with the weight of cement will increase both Rheological Properties and strengthened Properties of SCC.
EXPERIMENTAL INVESTIGATION OF DURABILITY TEST ON POLYMER CONCRETE(PCAshik97
Polymer concretes are a type of concrete that use polymers to replace lime-type cements as a binder.
The polymer is used in addition to portland cement to form Polymer Cement Concrete (PCC).
The composites do not contain hydrated cement phase,although Portland cement used as an aggregate or filler.
EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF POLYMERCONCRETEAshik97
The high amount of epoxy resin cause not only the high cost of monomer in Polymer concrete but also some drawbacks when sustainable development for repair works is considered.
The production of cement increases the content of CO2, which impacts on global warming. In this respect, using the chemical(monomer) can be an attractive alternative.
Elimination of Water in Polymer concrete tends to have best scope in the water scarce Areas
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.
We looked at the data. Here’s a breakdown of some key statistics about the nation’s incoming presidents’ addresses, how long they spoke, how well, and more.
My books- Hacking Digital Learning Strategies http://hackingdls.com & Learning to Go https://gum.co/learn2go
Resources at http://shellyterrell.com/emoji
32 Ways a Digital Marketing Consultant Can Help Grow Your BusinessBarry Feldman
How can a digital marketing consultant help your business? In this resource we'll count the ways. 24 additional marketing resources are bundled for free.
Study: The Future of VR, AR and Self-Driving CarsLinkedIn
We asked LinkedIn members worldwide about their levels of interest in the latest wave of technology: whether they’re using wearables, and whether they intend to buy self-driving cars and VR headsets as they become available. We asked them too about their attitudes to technology and to the growing role of Artificial Intelligence (AI) in the devices that they use. The answers were fascinating – and in many cases, surprising.
This SlideShare explores the full results of this study, including detailed market-by-market breakdowns of intention levels for each technology – and how attitudes change with age, location and seniority level. If you’re marketing a tech brand – or planning to use VR and wearables to reach a professional audience – then these are insights you won’t want to miss.
Artificial intelligence (AI) is everywhere, promising self-driving cars, medical breakthroughs, and new ways of working. But how do you separate hype from reality? How can your company apply AI to solve real business problems?
Here’s what AI learnings your business should keep in mind for 2017.
EFFECT OF SILICA FUME ON RHEOLOGY AND MECHANICAL PROPERTY OF SELF COMPACTING ...IAEME Publication
The usage of an extensive group of industrial mineral residues (silica fume and fly ash) and other products significantly increases the rheological performance of concrete. This research is supposed to take a look at Rheology and Strengthened Properties of Self Compacting Concrete with Silica fume. This examination commenced with 4 groups of Self Compacting Concrete changed with diverse probabilities of Silica fume (5%, 10%,15%, and 20%). The rheological properties of self-compacting concrete are investigated experimentally using the slump flow diameter, the U box test, the V funnel test, and the L box test. Compressive strength and flexural strength are the strengthened properties experimentally examined. In this study, we observed the suitable percent of silica fume, which offers advanced rheological characteristics of Self Compacting Concrete as equated to Conventional Self Compacting Concrete. Our experimental results show, by the replacing 15% of silica fume with the weight of cement will increase both Rheological Properties and strengthened Properties of SCC.
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.
Effect of silica fume on the strength of cement mortareSAT Journals
Abstract
The replacement of sand/cement by certain percentage of silica fumes, resulted in the improvement in compressive strength of the mortar. Silica fumes to the highly pozzolanic materials because it consists essentially of silica in non- crystalline form with a high specific surface. It is used to improve the mechanical properties of the concrete. The main objective of this paper is to study the effect of silica fume on the compressive strength of mortar. Three proportions of mixes viz mix 1:3, mix 1:4 and mix 1:6 with different percentages of silica fumes replacement with sand/cement were used. The maximum increase in strength at the age of 28 days when sand is replaced by 15% of silica fume has been observed as 40% and in case of cement replaced with 15% of silica fume, the observed increase in compressive strength of mortar comes out to be 28%.
A quantitative cost analysis shows that with the replacement of cement and sand by silica fume, the in cost is more when sand is replaced and it is less when cement is replaced.
Keywords: pozzolanic, silica fumes, non- crystalline, compressive strength
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...idescitation
ndustrial byproducts such as Silica Fume (SF) and Fly Ash (FA) can be utilized
to enhance the strength and water permeability characteristics of High Performance
Concrete (HPC). The utilization of these industrial by products is becoming popular
throughout the world because of the minimization of their potential hazardous effects on
environment. This paper investigates the individual effects of Silica Fume and Fly Ash as a
partial replacement of Ordinary Portland Cement (OPC) on water permeability,
compressive strength, split tensile strength and flexural tensile strength of High
Performance Concrete (HPC). To investigate these properties of concrete, the total
investigation was categorized into two basic test groups - SF Group for Silica Fume and FA
Group for Fly Ash. Seven types of mix proportions were used to cast the test specimens for
both groups. The replacement levels of OPC by Silica Fume were 0%, 2.5%, 5%, 7.5%,
10%, 15% and 20% where replacement levels of OPC by Fly Ash were 0%, 5%, 10%, 15%,
20%, 25% and 30%. 1% super-plasticizer was used in all the test specimens for high
performance (i.e., high workability at lower water-binder ratio) and to identify the sharp
effects of Silica Fume and Fly Ash on the properties of concrete. Water-binder ratio was
kept 0.42 for all cases and the specimens were tested at ages of 7, 14 and 28 days.10% Silica
Fume and 20% Fly Ash showed the lowest water penetration depth of 11mm and 15 mm
respectively. 7.5% Silica Fume and 10% Fly Ash were found to be optimum for maximum
compressive strength, maximum split tensile strength as well as maximum flexural tensile
strength.
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Nowadays high strength and high performance
concrete are widely used in many civil engineering
constructions. To produce them it is required to reduce the
water/powder ratio and increase the binder content.
Superplasticizers are commonly used to achieve the
workability. Silica fume is one of the popular pozzolanas used
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Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
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I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
"Impact of front-end architecture on development cost", Viktor Turskyi
Hl3513071310
1. Debabrata Pradhan et al Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1307-1310
RESEARCH ARTICLE
www.ijera.com
OPEN ACCESS
Effects of Silica Fume in Conventional Concrete
Debabrata Pradhan*, D. Dutta**
* (Lecturer, Civil Engineering Department, A.J.C.Bose Polytechnic, Berachampa, North 24 Parganas, West
Bengal, India)
** (Asst Professor, Camellia School of Engineering & Technology, Barasat, Kolkata,West Bengal, India)
ABSTRACT
The production of tailor made high strength and high performance concrete are made by incorporating silica fume
into the normal concrete and it is a routine one in the present days. The mix proportioning is intricate and the design
parameters are increased due to the incorporation of silica fume in conventional concrete. The aim of this paper is to
look into the different mechanical properties like compressive strength, compacting factor, slump of concrete
incorporating silica fume. In this present paper concrete incorporating silica fume are cast for 5 (five) mixes to
perform experiments. Different percentages of silica fume are used for cement replacement in order to carry out
these experiments at a single fixed water-cementitious materials ratio keeping other mix design parameters constant.
The cement replacement level by silica fume was 0%, 5%, 10%, 15% and 20% for a constant water-cementitious
materials (w/cm) ratio for 0.50. 100 and 150 mm cubes are used to determine the compressive strengths for all
mixes at the age levels of 24 hours, 7 and 28 days. Besides the compressive strengths other properties like
compacting factor, slump of concrete are also determined for five mixes of concrete.
Keywords - Silica fume, High strength concrete, High performance concrete, Strength. Slump.
I.
INTRODUCTION
Silica Fume Is A By-Product Derived During
The Production Of Elemental Silicon Or An Alloy
Containing Silicon And It Is Very Fine Non-Crystalline
Silica Produced In Electric Arc Furnaces As Defined By
The American Concrete Institute (ACI). Many
Researchers Made Extensive Experiments Around The
World And Observed That The Incorporation Of Silica
Fume In Concrete Improves The Different Mechanical
Properties Like Concrete Strengths, Modulus Of
Elasticity, Durability, Corrosion Protection, Chemical
And Abrasion Resistance. But No Unique Conclusion
Regarding The Optimum Percentages Of Cement
Replacement By Silica Fume Is Obtained, Although
Some
Researchers
Have
Reported
Different
Replacement Levels [1, 2 And 3]. Bhanja And Sengupta
[4, 5 And 6] Investigated The Effect Of Silica Fume On
The Compressive And Tensile Strength Of High
Performance Concrete (HPC) And Developed
Mathematical Model Using Statistical Methods To
Predict The 28-Days Compressive Strength Of Silica
Fume Concrete With Water- Cementitious Material
(W/Cm) Ratios Ranging From 0.3 To 0.42 And Cement
Replacement Percentages By Silica Fume From 5 To 30.
The Authors Observed That Optimum Cement
Replacement Percentage By Silica Fume Is Not Constant
At All Water-Binder Ratios But Depends On Water
Content Of Mix. The Authors Also Reported That
Compressive Strength Of Silica Fume Concrete Depends
On W/Cm, Total Cementitious Material Content And
Cement-Admixture Ratio. Song Et Al. [7] Predicted The
Diffusivity Procedure Of High Strength Concrete Based
On A Microstructure Model And Key Factors Which
Influence The Diffusivity Are As Water-To-Binder
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Ratio, Silica Fume Replacement ratio, and degree of
hydration and reported that incorporation of silica fume
reduce the diffusivity and makes the microstructure of
concrete denser. Mazloom et al. [8] surveyed the effects
of different levels of silica fume on fresh and mechanical
properties of high-strength concrete and evaluated that
the various properties like compressive strength, secant
modulus of elasticity, strain due to creep, shrinkage,
swelling and moisture movement are improved. Rao [9]
experimented to investigate the influence of silica fume
on various properties of cement pastes and mortars like
air content, specific gravity, normal consistency of
cement, and workability of mortar with different silica
fume contents and showed that incorporation of silica
fume lead the significant change in the behavior of
cement pastes and mortars. Katkhuda*1, Hanayneh2
and Shatarat1 experimented to investigate the isolated
effect of silica fume on compressive, tensile and flexure
strengths on high strength lightweight concrete and
showed that the compressive, tensile and flexure
strengths increased with silica fume incorporation but
the optimum replacement percentage is not constant
because it depends on the water–cementitious material
(w/cm) ratio of the mix [10]. To obtain the high strength
concrete rounded shape and smaller sizes (10 mm and
5mm) of aggregates should be used than other shape and
sizes respectively [11]. Higher percentage of super
plasticizer would be used in silica fume concrete for
higher percentage of cement replacement by silica fume
to overcome the adverse effect on workability [12, 13].
In this paper our endeavor is made to inspect the
different mechanical properties like compressive
strength, permeability, porosity, density, modulus of
elasticity, compacting factor, slump of
concrete
1307 | P a g e
2. Debabrata Pradhan et al Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1307-1310
incorporating silica fume considering a single watercementitious material ratio of 0.50.
II.
EXPERIMENTAL INVESTIGATION
A. MATERIALS
CEMENT
The cement used is Ordinary Portland Cement
of ACC brand of 43 grade in the present study which
surpasses BIS Specifications (IS 8112-1989) on
compressive strength levels.
FINE AGGREGATE
Locally available River sand i.e. natural sand as
per IS: 383-1970 is used. The bulk density of sand is
2610 kg/m3. The properties of fine aggregate are shown
in tabular form in Table 1.
Table 1: Properties of fine aggregate
Sl. No.
Property
Result
1.
Specific Gravity
2.61
2.
Fineness modulus
3.10
3.
Grading zone
II
Table 2
SILICA FUME- CHEMICAL & PHYSICAL
ANALYSIS REPORT
Sl.no.
1
2
3
4
5
6
7
Sl.no.
1
CHEMICAL
ANALYSIS
SO2
SO3
CL
Total Alkali
Moisture Content
Loss of ignition
pH
ANALYSIS
95.00 %
0.18 %
0.12 %
0.66%
0.16%
1.92%
7.90%
Oversize - % retained on
45 m sieve (wet sieved)
1.13%
Density – (specific
gravity)
2.27
Bulk Density – (per
ASTM) 187.91 kg/m3
11.73 lb/ft3
4
Specific Surface Area (by
BET)*
22.21 m2/kg
5
ANALYSIS
3
COARSE AGGREGATE
Crushed aggregate used is conforming to IS:
383-1970. The size, specific gravity and fineness
modulus of coarse aggregate are used as 12.5 mm, 2.83
and 6.28 respectively.
PHYSICAL TESTS
2
SILICA FUME (GRADE 920 D)
Silica fume used is conforming to ASTM- C
(1240-2000) and it is supplied by “ELKEM
INDUSTRIES” is named Elkem – micro silica 920 D.
The cement is partially replaced by silica fume. The
properties of silica fume are shown in Table 2. In
support of particle morphology with elemental existence
a Scanning Electron Microscopy (SEM) and EDAX
Spectrum have been reported in Figure 1 and Figure 2
respectively.
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Accelerated Pozzo;anic
Activity Index with
Portland Cement
134.90%
*As per manufacturers manual
SUPER PLASTICIZER
In this experimentfor improvement of the
workability of concrete, super plasticizer- CONPLASTSP 430 in the form of sulphonated Naphthalene
polymers conforming to IS: 9103-1999 and ASTM 494
type F is used. Conplast SP 430 has been specially
formulated to impart high range water reductions up to
25% without loss of workability or to produce high
quality concrete of lower permeability. The properties
of super plasticizer are shown in Table 3.
Table 3: Properties of super plasticizer
Sl.no. PHYSICAL TESTS
ANALYSIS
1
Specific Gravity
1.224
2
Chloride content
NIL
3
Air entrainment
11.73 lb/ft3
*As per manufacturers manual
MIX PROPORTIONING
In this experiment the mix of concrete is
designed as per the guidelines specified in I.S. 102621982 though some restriction is obligatory by restricting
the amount of cementitious material content is equal to
450 Kg/m3. The Table 4 shows mix proportion of
concrete (Kg/m3):
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1308 | P a g e
3. Debabrata Pradhan et al Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1307-1310
W/cm
Cement(
Kg/m3)
450
0.50
III.
Fine Aggregate
(Kg/m3)
599.290
Table 4: Mix Proportioning
Coarse Aggregate
Water (Kg/m3)
3
(Kg/m )
1050.080
225
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Compacting
factor
0.821 – 0.880
TEST RESULTS AND DISCUSSION
Table 5: Compressive strength of cube
W/cm
Cementitious
material
(Kg/m3)
% of
MA
(SF)
Compressive Strength (MPa)
150 mm cubes
100 mm cubes
%
of
SP
Slump
(mm)
CF
0
28
days
45.35
24
Hrs.
22.33
7
days
32.33
28
days
47.67
0.00
30,30,30
0.821
19.41
35.26
48.00
22.50
37.00
55.70
0.25
25,22,24
0.835
10
27.26
36.30
51.85
27.70
37.00
58.00
0.60
20,21,20
0.850
15
30.37
38.22
52.15
32.23
39.27
56.00
0.90
20,22,24
0.843
20
450
7
days
30.67
5
0.50
24
Hrs.
16.59
34.67
39.41
54.33
36.35
40.00
57.40
1.20
30,30,28
0.880
In this present paper experiments are
performed for 5 (five) mix of concrete incorporating
undensified silica fume. As smaller size of coarse
aggregate have exposure of larger surface, better
bonding of coarse aggregates with paste matrix at the
interfacial zone is occurred due to which smaller size
of coarse aggregate (i.e. 12.5 mm) is used in the
experimentations. Subsequently higher strength is
obtained at the interfacial zone between coarse
aggregate and paste matrix therefore; strength in
concrete is higher than control concrete (i.e. concrete
without silica fume) as the interfacial zone is denser.
Various cement replacement percentages by silica
fume are used to carry out these experiments at a
single constant water-cementitious materials ratio
while other mix design parameters are kept constant.
The cement replacement percentages by
silica fume are 0%, 5%, 10%, 15% and 20% for
water cementitious materials ratio 0.40. Compressive
strengths are determined at age levels of 24 hours, 7
days and 28 days for 100 mm and 150 mm cubes for
all mixes. Experiments are also performed to
determine the results of other properties like
compacting factor and slump for five mixes of
concrete. It is observed from experimental results
that compressive strengths for all replacement levels
of cement by silica fume (i.e. at 5 %, 10%, 15% and
20%) is higher than control concrete (i.e. concrete
without silica fume) at all ages (i.e. at 24 hours, 7
days and 28 days).
Experimental results provide evidence that
compressive strengths of 100 mm cubes are higher
than 150 mm cubes at all age levels and cement
replacement levels by silica fume. It is found that the
maximum compressive strength is obtained at 20%
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cement replacement by silica fume. Higher
compressive strength at 28 days of about 54.33MPa
for 150 mm cube and 57.40 MPa for 100 mm cube
are obtained at 20% cement replacement by silica
fume. But in control concrete (i.e. concrete without
silica fume) 28 days compressive strength is about
45.35 MPa for 150 mm cube and 47.67 MPa for 100
mm. It is observed that 28 days compressive strength
is increased near about by 20% for 150 mm cubes
and 60% for 100 mm cubes than control concrete i.e.
without silica fume. For workability, compacting
factor and slump value ranges from 0.82 to 0.88 and
20 to 50mm respectively. The value of slump showed
the mixes are cohesive in nature.
IV.
CONCLUSION
The optimum compressive strength is
obtained at 20% cement replacement by silica fume
at all age levels (i.e. at 24 hours, 7 and 28 days).
Slump value may be increased by increasing the
dosages of superplasticizer without hampering the
strength for further investigation but the ranges of
compacting factor from 0.82 to 0.88 and slump value
from 20 to 50mm are also good for using concrete in
the field in control system. Higher compressive
strength resembles that the concrete incorporated
with silica fume is high strength concrete (HSC) as
per IS code recommendations. It is reported that
improved pore structures at transition zone of silica
fume concrete led to it as high performance concrete
but durability tests are yet to be surveyed. During the
testing of cubes at 28 days the failure plane of cubes
cut the aggregates but not along the inter facial zone
which is concluded that the interfacial zone attained
1309 | P a g e
4. Debabrata Pradhan et al Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1307-1310
much higher strength than control concrete i.e.
concrete without silica fume.
www.ijera.com
Reactivity, ACI Materials Journal, 90( 2),
1993, 143 - 151.
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