Freeze-thaw durability of concrete: Ice formation process in pores

被引:186
作者
Cai, H [1 ]
Liu, X [1 ]
机构
[1] Tsing Hua Univ, Dept Civil Engn, Beijing 100084, Peoples R China
关键词
D O I
10.1016/S0008-8846(98)00103-3
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Freeze-thaw durability of concrete is of great importance to hydraulic structures in cold areas. Study of ice formation process in concrete pores is necessary to evaluate the damages in concrete caused by freezing. In this paper, freezing of pore solution in concrete exposed to a freeze-thaw cycle is studied by following the change of concrete electrical conductivity with freezing temperatures. Concretes were subjected to freeze-thaw cycles with temperature varying between -0 degrees C and -20 degrees C. In the freezing process, the changing rate of concrete electrical conductivity obviously decreases at about -10 degrees C, indicating that more pore solution in concrete freezes above -10 degrees C than below -10 degrees C. According to Powers' static hydraulic pressure hypothesis, it is thought that frost damage mainly occurs between 0 degrees C and -100 degrees C. To ordinary concrete, frost damages below -10 degrees C are negligible. (C) 1998 Elsevier Science Ltd.
引用
收藏
页码:1281 / 1287
页数:7
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