The Experts below are selected from a list of 23328 Experts worldwide ranked by ideXlab platform
M.m. Reda - One of the best experts on this subject based on the ideXlab platform.
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Durability of Styrene-Butadiene latex Modified Concrete
Cement and Concrete Research, 1997Co-Authors: F.a. Shaker, Amr S. El-dieb, M.m. RedaAbstract:The durability of reinforced Concrete structures represents a major concern to many investigators. The use of latex Modified Concrete (LMC) in construction has urged researchers to review and investigate its different properties. This study is part of a comprehensive investigation carried on the use of polymers in Concrete. The main objective of this study to investigate and evaluate the main durability aspects of Styrene-Butadiene latex Modified Concrete (LMC) compared to those of conventional Concrete. Also, the main microstructural characteristics of LMC were studied using a Scanning Electron Microscope (SEM). The SEM investigation of the LMC showed major differences in its microstructure compared to that of the conventional Concrete. The LMC proved to be superior in its durability compared to the durability of conventional Concrete especially its water tightness (measured by water penetration, absorption, and sorptivity tests), abrasion, corrosion, and sulphate resistance.
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Evaluation of the corrosion resistance of latex Modified Concrete (LMC)
Cement and Concrete Research, 1997Co-Authors: S.h. Okba, Amr S. El-dieb, M.m. RedaAbstract:In recent years, various reinforced Concrete structures worldwide have suffered rapid deterioration. Therefore, durability of Concrete structures especially those exposed to aggressive environments is of great concern. Many deterioration causes and factors have been investigated. Corrosion of steel reinforcement was found to be one of the major deterioration problems. Penetration of chloride ions is one of the main causes which induces corrosion. The objective of this study is to evaluate the corrosion resistance of latex Modified Concrete (LMC) compared to conventional Concrete using an accelerated corrosion cell. The corrosion cell proved to be a good and simple method to evaluate the durability of Concretes especially with respect to chloride ion penetration, and the protection of reinforcement against corrosion. The LMC proved to be superior in its corrosion resistance compared to conventional Concrete, which recommends its use in structures exposed to severe aggressive environments.
Baoshan Huang - One of the best experts on this subject based on the ideXlab platform.
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rubber Modified Concrete improved by chemically active coating and silane coupling agent
Construction and Building Materials, 2013Co-Authors: Qiao Dong, Baoshan HuangAbstract:In the study, a new approach was employed to improve the performance of rubber Modified cement Concrete by developing a cementitious coating layer around rubber particles with silane coupling agent. To validate the effectiveness of the approach, coated and uncoated rubber Modified Concrete were evaluated through laboratory experiments. The compressive strength, split tensile strength, chloride ion resistance, and energy absorption capability were characterized through laboratory tests for Concrete containing different contents of crumb rubber. The results show that the compressive and split tensile strength of the Concrete incorporating coated rubber improved by 10–20%, compared to Concrete with uncoated rubber. Although Concrete with uncoated rubber exhibited lower chloride ion resistance than control Concrete without rubber, Concrete with coated rubber could maintain chloride ion resistance similar to that of control Concrete. The energy absorption capability of Concrete was also improved through the cementitious layer developed using silane coupling agent.
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Development of waste tire Modified Concrete
Cement and Concrete Research, 2004Co-Authors: Michael A. Stubblefield, John Eggers, Gregory Garrick, Christopher Abadie, Baoshan HuangAbstract:Abstract In this study, waste tire Modified Concrete was investigated experimentally. Two types of waste tire configurations were evaluated. One was in the form of chips, or particles, and the other was in the form of fibers. For the waste tire chip Modified Concrete, surface treatment by saturated NaOH solution and physical anchorage by drilling a hole at the center of the chips were also investigated. For the waste tire fiber Modified Concrete, fibers with various aspect ratios were utilized. A hybrid fiber reinforcement using waste tire fiber and polypropylene (PP) fiber was also investigated. The effect of waste tire resources (car tires or truck tires) on the strength and stiffness was evaluated. A total of 10 batches of Concrete, which yielded sixty φ152.4×304.8 mm cylinders, were prepared. Compressive strength, compressive modulus of elasticity, Poisson's ratio, and split tensile strength tests were conducted on the prepared samples. Ways to further recover the lost strength and stiffness of waste tire Modified Concrete were discussed based on the test results.
Mohammad Ismail - One of the best experts on this subject based on the ideXlab platform.
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Strength and Durability Characteristics of Polymer Modified Concrete Incorporating Vinyl Acetate Effluent
Advanced Materials Research, 2013Co-Authors: Ainul Haezah Noruzman, Mohammad Ismail, Muhammad Aamer Rafique Bhutta, Taliat Ola Yusuf, Ibrahim A. Shehu, I. O. HassanAbstract:Waste generation from surface coating industries brings about worsening of the environmental scenery and human health in the world. The production of these wastes is detrimental to surrounding areas in landfill or dumping spaces, therefore necessary action is required to minimize the unpleasant situation. This research is aimed at using waste generated from the manufacture of paint known as vinyl acetate effluent as an admixture in Concrete. The material is rinse water taken from the cleaning process reactor. Concrete of 0% vinyl acetate effluent cured in water with those of 2.5%, 5%, 10% and 20% by weight of cement were produced and cured using Japanese standard. The specimens were tested for compressive strength, splitting tensile strength and durability at 3, 7 and 28 days. Findings show that incorporating of 2.5% of Vinyl acetate effluent improves strength properties of Concrete. Higher resistance of water absorption and sulfate conditions were observed in polymer Modified Concrete. The study has shown that incorporating vinyl acetate effluent in producing polymer Modified Concrete could bring lights of using the waste material for sustainable and environmental preservations.
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Performance of natural rubber latex Modified Concrete in acidic and sulfated environments
Construction and Building Materials, 2012Co-Authors: Bala Muhammad, Mohammad IsmailAbstract:Abstract Deterioration of Concrete due to chemical aggression is a serious menace to the two major properties of Concrete; strength and durability. Hence, precautionary measures towards curtailing chemical attack on Concrete could be of great importance. This paper reports experimental findings regarding performance of natural rubber latex (NRL) Modified Concrete in acidic as well as sulfated environments. Normal and Modified Concretes were developed and subjected to two simulated aggressive curing mediums; 5% sulfuric acid (H 2 SO 4 ) and 2.5% sodium sulfate (Na 2 SO 4 ). Latex/water ratio was varied from 0% to 20%. Concrete phases were studied through SEM. In addition, capacities in moisture ingress, being the main gateway to chemical attack on Concrete was also investigated through water absorption test. Results have shown that inclusion of appropriate quantity of latex into Concrete plays a significant role in curbing attack from H 2 SO 4 and Na 2 SO 4 . For instance, considering Na 2 SO 4 alone, strength gain in the Modified Concrete was 86.2% higher than the corresponding value in normal Concrete within a period of 84 days. However, physical observations revealed a high volume change associated with latex in the Modified specimens subjected to H 2 SO 4 which suggests attack by acidic agents on hydrocarbon substances.
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Influence of non-hydrocarbon substances on the compressive strength of natural rubber latex-Modified Concrete
Construction and Building Materials, 2012Co-Authors: Bala Muhammad, Mohammad Ismail, Muhammad Aamer Rafique Bhutta, Zaiton Abdul-majidAbstract:Inclusion of polymeric substances into hydraulic cement Concrete has made a tremendous impact towards improving its performance properties. However, polymers to be included into Concrete should neither cause damage to its mechanical capacities nor to its durability characteristics. This article reports experimental findings regarding influence of non-hydrocarbon substances present in natural rubber latex (NRL) on the compressive strength of NRL-Modified Concrete. Six selected clonal latexes were chemically analyzed for thirteen compositional parameters each. The latexes are used in making Modified Concretes and specimens obtained from these Concretes were given both moisture and dry curing treatments for effective cement-hydration and latex-film formations respectively. Eventually, Concretes Modified with latexes containing higher non-hydrocarbon substances especially volatile fatty acids (VFA) and zinc were observed to suffer significant compressive strength losses. Indeed, 12.4% loss in compressive strength was recorded against Concrete Modified with the latex having the highest contents of VFA and zinc. However, 2% and 4% increase in the strength over normal Concrete were observed in relation to two of the latexes investigated.
Gregory Garrick - One of the best experts on this subject based on the ideXlab platform.
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Waste tire fiber Modified Concrete
Composites Part B: Engineering, 2004Co-Authors: Gregory Garrick, John Eggers, Christopher Abadie, Michael A. Stubblefield, Su-seng PangAbstract:Abstract It is well known that waste tire chip Modified Concrete has very high toughness. However, its strength and stiffness are reduced significantly. Sometimes, the strength and stiffness are so low that the Modified Concrete cannot be used as structural materials. In this paper, waste tires were used in the form of fibers and waste tire fiber Modified Concrete was developed. A total of 42 ∅ 152.4 mm by 304.8 mm (6 in. by 12 in.) cylinders were prepared to conduct compressive strength, split tensile strength, and modulus of elasticity tests. Among them, six cylinders were prepared without waste tires, and six samples were prepared using waste tire chips. They were used as controls in this study. The remaining 30 samples were prepared using waste tire fibers with various lengths and stiffness. The test results show that, while the strength and stiffness of the Concrete Modified with waste tire fibers were still lower than those without waste tires, they were higher than those with waste tire chips. A two-phase composite model was also developed and a finite element analysis was conducted on this model. The analysis results show that the stress concentration in waste tire fiber Modified Concrete is lower than that in waste tire chip Modified Concrete. Using stiffer and thinner waste tire fibers can further reduce stress concentrations.
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Development of waste tire Modified Concrete
Cement and Concrete Research, 2004Co-Authors: Michael A. Stubblefield, John Eggers, Gregory Garrick, Christopher Abadie, Baoshan HuangAbstract:Abstract In this study, waste tire Modified Concrete was investigated experimentally. Two types of waste tire configurations were evaluated. One was in the form of chips, or particles, and the other was in the form of fibers. For the waste tire chip Modified Concrete, surface treatment by saturated NaOH solution and physical anchorage by drilling a hole at the center of the chips were also investigated. For the waste tire fiber Modified Concrete, fibers with various aspect ratios were utilized. A hybrid fiber reinforcement using waste tire fiber and polypropylene (PP) fiber was also investigated. The effect of waste tire resources (car tires or truck tires) on the strength and stiffness was evaluated. A total of 10 batches of Concrete, which yielded sixty φ152.4×304.8 mm cylinders, were prepared. Compressive strength, compressive modulus of elasticity, Poisson's ratio, and split tensile strength tests were conducted on the prepared samples. Ways to further recover the lost strength and stiffness of waste tire Modified Concrete were discussed based on the test results.
Michael A. Stubblefield - One of the best experts on this subject based on the ideXlab platform.
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Waste tire fiber Modified Concrete
Composites Part B: Engineering, 2004Co-Authors: Gregory Garrick, John Eggers, Christopher Abadie, Michael A. Stubblefield, Su-seng PangAbstract:Abstract It is well known that waste tire chip Modified Concrete has very high toughness. However, its strength and stiffness are reduced significantly. Sometimes, the strength and stiffness are so low that the Modified Concrete cannot be used as structural materials. In this paper, waste tires were used in the form of fibers and waste tire fiber Modified Concrete was developed. A total of 42 ∅ 152.4 mm by 304.8 mm (6 in. by 12 in.) cylinders were prepared to conduct compressive strength, split tensile strength, and modulus of elasticity tests. Among them, six cylinders were prepared without waste tires, and six samples were prepared using waste tire chips. They were used as controls in this study. The remaining 30 samples were prepared using waste tire fibers with various lengths and stiffness. The test results show that, while the strength and stiffness of the Concrete Modified with waste tire fibers were still lower than those without waste tires, they were higher than those with waste tire chips. A two-phase composite model was also developed and a finite element analysis was conducted on this model. The analysis results show that the stress concentration in waste tire fiber Modified Concrete is lower than that in waste tire chip Modified Concrete. Using stiffer and thinner waste tire fibers can further reduce stress concentrations.
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Development of waste tire Modified Concrete
Cement and Concrete Research, 2004Co-Authors: Michael A. Stubblefield, John Eggers, Gregory Garrick, Christopher Abadie, Baoshan HuangAbstract:Abstract In this study, waste tire Modified Concrete was investigated experimentally. Two types of waste tire configurations were evaluated. One was in the form of chips, or particles, and the other was in the form of fibers. For the waste tire chip Modified Concrete, surface treatment by saturated NaOH solution and physical anchorage by drilling a hole at the center of the chips were also investigated. For the waste tire fiber Modified Concrete, fibers with various aspect ratios were utilized. A hybrid fiber reinforcement using waste tire fiber and polypropylene (PP) fiber was also investigated. The effect of waste tire resources (car tires or truck tires) on the strength and stiffness was evaluated. A total of 10 batches of Concrete, which yielded sixty φ152.4×304.8 mm cylinders, were prepared. Compressive strength, compressive modulus of elasticity, Poisson's ratio, and split tensile strength tests were conducted on the prepared samples. Ways to further recover the lost strength and stiffness of waste tire Modified Concrete were discussed based on the test results.