砂浆在盐冻条件下的氯离子侵蚀

Chloride attack in mortar under salt freezing condition

通过自由氯离子滴定试验以及氯离子扩散深度试验,研究了盐冻损伤对普通砂浆氯离子扩散性能的影响。结果表明,在30 d内的同等氯离子侵蚀时间下,盐冻周期为2、3 d的试件要比1 d的扩散系数和表面氯离子浓度大。同时回归分析表明,氯离子扩散系数与盐冻循环次数,以及每个盐冻周期包含的天数之间分别具有明显的非线性关系。

The influence of damage caused by salt-freezing on the performance of chloride diffusion of mortar is studied by the experiments of free chloride concentration titration and chloride diffusion depth.Test results show that within 30 days, the specimens undergoing the cycle including 2 days or 3 days have larger diffusion coefficient and surface chloride concentration than that undergoing the cycle including 1 day.Meanwhile ,regression analysis showed that there was a obvious nonlinear relationship between the diffusion coefficient of chloride ions and the number of cycles of salt freezing, as well as the number of days in each salt freezing period separately.