The Experts below are selected from a list of 19881 Experts worldwide ranked by ideXlab platform
C S Poon - One of the best experts on this subject based on the ideXlab platform.
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properties of self compacting concrete prepared with recycled glass aggregate
Cement & Concrete Composites, 2009Co-Authors: Shicong Kou, C S PoonAbstract:Abstract The effects of recycled glass (RG) cullet on fresh and hardened properties of self-compacting concrete (SCC) were investigated. RG was used to replace river sand (in proportions of 10%, 20% and 30%), and 10 mm granite (5%, 10% and 15%) in making the SCC concrete mixes. Fly ash was used in the concrete mixes to suppress the potential alkali-silica reaction. The experimental results showed that the slump flow, blocking ratio, air content of the RG–SCC mixes increased with increasing recycled glass content. The compressive strength, tensile splitting strength and Static Modulus of elasticity of the RG–SCC mixes were decreased with an increase in recycled glass aggregate content. Moreover, the resistance to chloride ion penetration increased and the drying shrinkage of the RG–SCC mixes decreased when the recycled glass content increased. The results showed that it is feasible to produce SCC with recycled glass cullet.
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influence of fly ash as cement replacement on the properties of recycled aggregate concrete
Journal of Materials in Civil Engineering, 2007Co-Authors: Shicong Kou, C S Poon, D ChanAbstract:The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties. This paper tries to address the deficiency of the use of recycled aggregates by systematically presenting results on the influence of incorporating Class F fly ash on concrete properties. In this study, two series of concrete mixtures were prepared with water-to-binder (W/B) ratios of 0.45 and 0.55. The recycled aggregate was used as 0, 20, 50, and 100% by weight replacements of natural aggregate. In addition, fly ash was used as 0, 25, and 35% by weight replacements of cement. The results showed that the compressive strengths, tensile strengths, and Static Modulus of elasticity values of the concrete at all ages decreased as the recycled aggregate and the fly ash contents increased. Further, an increase in the recycled aggregate content decreased the resistance to chloride ion penetration and increased the drying shrinkage and creep of concrete. Nevertheless, the use of fly ash as a substitute for...
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influence of steam curing on hardened properties of recycled aggregate concrete
Magazine of Concrete Research, 2006Co-Authors: C S Poon, D ChanAbstract:The effects of steam curing on the hardened properties of recycled aggregate concrete were investigated. In this study, two series of concrete mixtures with water/cement ratios of 0·55 and 0·45 were prepared. Recycled aggregates were used as 0, 20, 50 and 100% by volume replacements of natural coarse aggregate in the concrete mixtures. The concrete specimens underwent standard water-curing and steam-curing regimes. The test results showed that the strength of concrete decreased as the recycled aggregate content increased. An initial steam-curing regime increased the one-day strength of the concrete, but the corresponding 28- and 90-day strengths decreased. Furthermore, steam curing reduced the Static Modulus of elasticity of concrete compared with that of the water cured concrete. However, the negative effect of steam curing diminished as the recycled aggregate content increased. Moreover, steam curing decreased the drying shrinkage and increased the resistance against chloride ion penetration of the recy...
Ravi K Sharma - One of the best experts on this subject based on the ideXlab platform.
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mechanical and durability properties of waste rubber fiber concrete with and without silica fume
Journal of Cleaner Production, 2016Co-Authors: Trilok Gupta, Sandeep Chaudhary, Ravi K SharmaAbstract:Abstract Availability of natural sand conforming to required standards for use in concrete is diminishing day by day and is severely affecting the construction industry. On the other hand, disposal of used rubber tyres is an environmental, health and esthetic problem as its recycling is extremely difficult. In this paper, a systematic experimental investigation is carried out on concrete with rubber fibers (obtained by grinding waste rubber tyres) as partial replacement of fine aggregates, to evaluate the compressive strength, density, water permeability, Static Modulus of elasticity, dynamic Modulus of elasticity and chloride diffusion. Rubber fibers have been used with three different water–cement ratios (0.35, 0.45 and 0.55). Six levels of rubber fibers contents (0, 5, 10, 15, 20 and 25%) as partial replacement of sand and three levels of silica fume (0, 5 and 10%) as partial replacement of cement have been considered. Microstructure analysis of rubber fiber sample by scanning electron microscope and Energy dispersive X-ray analyzer has been carried out. Compressive strength, Static and dynamic Modulus of elasticity of waste rubber tyre fiber concrete are found to decrease with the increase in the replacement level of fine aggregates by rubber fibers.
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assessment of mechanical and durability properties of concrete containing waste rubber tire as fine aggregate
Construction and Building Materials, 2014Co-Authors: Trilok Gupta, Sandeep Chaudhary, Ravi K SharmaAbstract:Abstract Now a day’s natural sand is becoming scarcer and costlier due to its non-availability. Waste rubber tire as fine aggregates can be an economical and sustainable alternative to river sand. In this study attempt has been made to utilize waste rubber tire as partial replacement of fine aggregate in the form of rubber ash and rubber ash with rubber fibers (combined form) with three w/c ratios. Workability, compressive strength, flexural strength, density, water absorption, abrasion resistance, carbonation depth, Static Modulus of elasticity, dynamic Modulus of elasticity and chloride ion penetration of rubber ash concrete and modified concrete (10% rubber ash and varied percentage of rubber fibers) have been obtained. Micro-structural study using XRD, EDAX and SEM has also been carried out in this work. It has been shown that flexural strength of rubber ash concrete decreases with the increase of percentage of rubber ash whereas flexural strength of modified concrete is increased with the increase of the percentage of rubber fibers content. The abrasion resistance, carbonation depth, Modulus of elasticity and chloride ion penetration of rubber ash concrete and modified concrete were also affected by addition of rubber ash and rubber fibers in concrete.
Climent Molins - One of the best experts on this subject based on the ideXlab platform.
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relationship between the Static and dynamic elastic Modulus of brick masonry constituents
Construction and Building Materials, 2020Co-Authors: Nirvan Makoond, Albert Cabane, Luca Pela, Climent MolinsAbstract:Abstract Different brick masonry typologies have been and are still widely used in construction worldwide. Despite being a fundamental deformation property, experimentally determining the Static elastic Modulus in compression for brick masonry constituents remains a challenging task. Static Modulus estimates usually show much larger dispersion than those involved in determining the dynamic elastic Modulus. Although the Static property is preferred for common structural verifications, the relationship between the two is yet to be well understood. In light of the above, this paper provides an empirical expression to estimate the Static elastic Modulus of brick masonry constituents from its dynamic counterpart.
Sherif H Altersawy - One of the best experts on this subject based on the ideXlab platform.
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recycled glass as a partial replacement for fine aggregate in self compacting concrete
Construction and Building Materials, 2012Co-Authors: Esraa Emam Ali, Sherif H AltersawyAbstract:Abstract Glass has been indispensable to man’s life due to its properties, including pliability to take any shape with ease, bright surface, resistance to abrasion, reasonable safety and durability. Waste glass creates serious environmental problems, mainly due to the inconsistency of waste glass streams. With increasing environmental pressure to reduce solid waste and to recycle as much as possible, the concrete industry has adopted a number of methods to achieve this goal. Self-Compacting Concrete (SCC) may lead to evolution of a more quality controlled concrete, assuring a better workability and avoiding human errors with regard to mixing and workability issues. On the other hand, it resolves the problem of noise and vibration during installation. The object of this research work is to study the effect of using recycled glass waste, as a partial replacement of fine aggregate, on the fresh and hardened properties of Self-Compacting Concrete (SCC). A total of 18 concrete mixes were produced with different cement contents (350, 400 and 450 kg/m3) at W/C ratio of 0.4. Recycled glass was used to replace fine aggregate in proportions of 0%, 10%, 20%, 30%, 40%, and 50%. The experimental results showed that the slump flow increased with the increase of recycled glass content. On the other hand, the compressive strength, splitting tensile strength, flexural strength and Static Modulus of elasticity of recycled glass (SCC) mixtures were decreased with the increase in the recycled glass content. The results showed that recycled glass aggregate can successfully be used for producing self-compacting concrete.
Shicong Kou - One of the best experts on this subject based on the ideXlab platform.
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properties of self compacting concrete prepared with recycled glass aggregate
Cement & Concrete Composites, 2009Co-Authors: Shicong Kou, C S PoonAbstract:Abstract The effects of recycled glass (RG) cullet on fresh and hardened properties of self-compacting concrete (SCC) were investigated. RG was used to replace river sand (in proportions of 10%, 20% and 30%), and 10 mm granite (5%, 10% and 15%) in making the SCC concrete mixes. Fly ash was used in the concrete mixes to suppress the potential alkali-silica reaction. The experimental results showed that the slump flow, blocking ratio, air content of the RG–SCC mixes increased with increasing recycled glass content. The compressive strength, tensile splitting strength and Static Modulus of elasticity of the RG–SCC mixes were decreased with an increase in recycled glass aggregate content. Moreover, the resistance to chloride ion penetration increased and the drying shrinkage of the RG–SCC mixes decreased when the recycled glass content increased. The results showed that it is feasible to produce SCC with recycled glass cullet.
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influence of fly ash as cement replacement on the properties of recycled aggregate concrete
Journal of Materials in Civil Engineering, 2007Co-Authors: Shicong Kou, C S Poon, D ChanAbstract:The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties. This paper tries to address the deficiency of the use of recycled aggregates by systematically presenting results on the influence of incorporating Class F fly ash on concrete properties. In this study, two series of concrete mixtures were prepared with water-to-binder (W/B) ratios of 0.45 and 0.55. The recycled aggregate was used as 0, 20, 50, and 100% by weight replacements of natural aggregate. In addition, fly ash was used as 0, 25, and 35% by weight replacements of cement. The results showed that the compressive strengths, tensile strengths, and Static Modulus of elasticity values of the concrete at all ages decreased as the recycled aggregate and the fly ash contents increased. Further, an increase in the recycled aggregate content decreased the resistance to chloride ion penetration and increased the drying shrinkage and creep of concrete. Nevertheless, the use of fly ash as a substitute for...