关键词: 引气混凝土;水胶比;孔结构;抗渗性

Abstract: Aimed at the cast-in-place concrete in western cold and saline soil area,the effects of different water-binder ratio on the pore structure parameters and impermeability of air-entraining concrete at low temperature(3 ℃).The results show that with the increase of water-binder ratio, the porosity and the spacing factor of the air-entraining concrete show an increasing trend, under the condition of low temperature curing, the porosity and the spacing factor are larger than the standard curing conditions;under the conditions of low temperature curing, the main pore size distribution of concrete is obviously higher than that under the standard curing condition and the impermeability of concrete is less than that under the standard curing condition;with the increase of water-binder ratio,the resistance to chloride ion permeability decreased, the larger water-binder ratio increase, and the faster the impermeability decrease.The electric flux and chloride migration coefficient of concrete show a high positive and negative correlation with the parameters of concrete pore structure(porosity, spacing factor, pore size distribution).

Key words: air-entraining concrete;water-binder ratio;pore structure;impermeability