干湿循环次数对氯离子扩散系数的影响

研究了4种混凝土干湿循环次数与氯离子扩散系数的关系.通过测定各混凝土在盐湖卤水-干湿循环环境下的氯离子含量,应用三维扩散理论模型计算氯离子扩散系数.结果表明:各混凝土的氯离子扩散系数(Dcx)与干湿循环次数呈幂指数函数关系,Dcx值与干湿循环次数、粉煤灰和矿渣的掺量呈正相关关系;与硅灰的掺量呈负相关关系.

Influence of Dry-wet Cycles on Chloride Diffusion Coefficient

The relationship between wet-dry cycles and chloride diffusion coefficient was investigated by using four different concretes. Chloride diffusion coefficient was estimated by applying the model of three-dimensional diffusion with the chloride contents of the concrete at different wet-dry cycles. The result showed that there existed the positive power function relation between the chloride diffusion Coefficient of concrete (Dcx) with wet-dry cycles, the value of Dcx had a typical positive correlation with wet-dry cycles, fly ash or slag addition amount, and the content of silica fumes was negatively correlated with it.