Influence of zeolite internal curing on shrinkage-creep-cracking behavior of ECC and tensile property of rebar reinforced ECC
Xuan Zheng, Shengzhe Gao, Kefan Liu, Fangzheng Wang, Zhongzhen Wu
Abstract
In this study, calcined zeolite particles were used as internal curing agent to replace quartz sand in Engineered Cementitious Composites (ECC), the influences of zeolite internal curing on shrinkage, creep and cracking behavior of ECC were experimentally investigated, and tensile property of rebar reinforced ECC were also investigated. High strength ECC specimens with water-binder ratio of 0.19 were prepared, and the zeolite replacements were controlled as 30%. Shrinkage and relative humidity test, steel ring restraint test, and uniaxial tension test were conducted on the specimens. The test results show that, 1) the shrinkage of ECC could be significantly reduced by zeolite internal curing, but the drying shrinkage of SAC ECC could not be reduced; 2) the decrease of relative humidity caused by environment drying can be alleviated more significantly in OPC ECC, and the creep performance of OPC ECC can be improved more evidently in middle age; 3) internal curing of zeolite can enhance multiple cracking and tensile strain hardening of ECC; 4) the cracking load, yielding load and yielding strain of reinforced ECC member can be improved by zeolite internal curing.