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Title |
Influence of Water-Binder Ratio and Expansion Admixture on Mechanical Properties of Strain-Hardening Cement-Based Composite with Hybrid Steel and Polyethylene Fibers
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Keywords |
팽창재 ; 섬유보강 시멘트 복합체(SHCC) ; 역학적 특성 직접인장 ; 압축 ; expansion admixture ; strain-hardening cement-based composite(SHCC) ; mechanical properties ; direct tension ; compression |
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Abstract |
Hybrid SHCC is being researched actively for its excellent performance in controlling macro and micro cracks using macro and micro fibers, respectively. However, a significant autogenous shrinkage of SHCC is expected since it possesses high unit cement volume in its mix proportion, resulting in autogenous shrinkage cracks. Therefore, this study was performed to evaluate mechanical property of shrinkage-reducing type hybrid SHCC mixed together with steel fiber and PE fiber with excellent micro/macro crack controlling performance. In order to evaluate mechanical property of shrinkage-reducing type hybrid SHCC, replacement ratios of 0% and 10% of expansive admixture and water to binder ratios of 0.45, 0.3, and 0.2 were considered as variables. Then, shrinkage, compressive, flexural, and direct tensile tests were performed. The test results showed that mix proportion with W/B 0.3 significantly improved mechanical performance by using 10% replacement of expansive admixture.
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