单向荷载及冻融循环对氯离子渗透性的影响

摘要

采用快速氯离子电迁移法(RCM法)测定了不同单向荷载、冻融循环次数和养护龄期条件下C30高性能混凝土的氯离子扩散系数,研究了氯离子扩散系数与各影响因素之间的函数关系.结果表明:单向荷载、冻融循环次数和养护龄期均对氯离子渗透性能产生显著影响.氯离子扩散系数与单向荷载加载等级之间近似呈二次多项式函数关系,与冻融循环次数之间近似呈线性函数关系,与养护龄期之间近似呈幂函数关系.%The chloride diffusion coefficients of C30 high performance concrete subjected to different unilateral load and freeze-thaw cycle number at different curing age were measured by electro-migration(RCM) tests. The function relations of chloride diffusion coefficients with different factors were established. The test results indicate that unilateral load, freeze-thaw cycle number and curing age have significantly influence on chloride permeability in concrete. The relationship between chloride diffusion coefficients and load grade, freeze-thaw cycle number and curing age is nearly suitable to quadratic polynomial, linear and power function relation respectively.