Freeze-thaw durability of concrete: Ice formation process in pores
Freeze-thaw durability of concrete: Ice formation process in pores
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DOI：
10.1016/s0008-8846(98)00103-3
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发表时间：
1998-09-01
影响因子：
11.4
通讯作者：
Liu, X
中科院分区：
文献类型：
--
作者：
Cai, H;Liu, X
混凝土的冻融耐久性对于寒冷地区的水工建筑物具有重要意义。研究混凝土孔隙中的冰形成过程对于评估冻结对混凝土造成的损害是必要的。本文通过跟踪混凝土电导率随冻结温度的变化来研究暴露于冻融循环的混凝土中孔隙溶液的冻结。将混凝土在-0℃~-20℃温度范围内进行冻融循环。冻结过程中，在-10℃左右，混凝土电导率变化率明显减小，表明-10℃以上混凝土中的孔隙溶液冻结数量多于-10℃以下。根据Powers静水压假说，认为冻害主要发生在0℃~-100℃之间。对于普通混凝土，-10℃以下冻害主要发生在-10℃以下。可以忽略不计。 (C) 1998 爱思唯尔科学有限公司。
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.