Abstract

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Author(s):: GAO Shu-ling; SHI Hong-fei; WANG Xiao-wei; 1.School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Civil Engineering Technology Research Center of Hebei Province, Hebei University of Technology, Tianjin 300401, China

Abstract:: In order to study the (salt) frozen resistance with initial crack of polyvinyl alcohol-engineered cementitious composites (PVA-ECC), the antifreeze performance of PVA-ECC with two kinds of different initial crack were studied by rapid freeze-thawing experiment in fresh water environment and chlorine salt environment respectively. The influence of different crack height, fly ash content and freeze-thaw cycle times on the frozen resistance of PVA-ECC were analyzed and compared, and the influence mechanism of the factors were analyzed. The results show that the antifreeze performance of PVA-ECC is poorer in chlorine salt environment and surface spalling is serious. Fly ash content has a great influence on the antifreeze performance of PVA-ECC. The higher the fly ash content is, the worse the antifreeze performance of PVA-ECC is. Before 125 times freeze-thaw cycle, effect of crack height on the mass loss is great in fresh water environment. The longer the crack, the mass loss rate is greater. After 125 times freeze-thaw cycle, effect of crack height on the mass loss is not obvious. During the entire freeze-thaw cycle process, whether in fresh water environment or in chlorine salt environment, the longer the crack, the dynamic elastic modulus reduces more and the frost resistance is poorer.