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采用ASTM法测试了不同阴极NaCl溶液浓度(质量分数,下同)条件下的混凝土6h电通量,分析了氯盐浓度对混凝土中氯离子渗透系数的影响规律并探讨了其中的作用机理.结果发现:氯盐浓度对氯离子渗透系数的影响存在峰值,在一定浓度范围内可用上凸型二次多项式来表示;对混凝土耐久性破坏最严重的危险氯盐浓度范围为4.0%~6.0%;当氯盐浓度大于9.0%时,混凝土中的氯离子渗透系数反而保持在较低水平.
The 6h electric flux of concrete with different cathodic NaCl concentrations (mass fraction, the same below) was tested by ASTM method and the influence of chloride concentration on chloride ion permeability coefficient in concrete was analyzed and the mechanism of action was discussed. It is found that the influence of chloride concentration on the chloride ion permeability coefficient has a peak, which can be expressed by a convex quadratic polynomial in a certain concentration range. The concentration of dangerous chloride salt with the most serious damage to durability of concrete is 4.0% -6.0% When the chloride concentration is more than 9.0%, the concrete chloride ion permeability coefficient instead remains at a low level.