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利用自然浸泡试验,研究了不同养护龄期的矿渣混凝土在不同暴露时间下的氯离子表观扩散系数,分析了养护龄期对氯离子表观扩散系数的影响.将表观扩散系数看作暴露时间内即时扩散系数的积分平均值,将得到的表观扩散系数转换为即时扩散系数,推导出养护龄期与即时扩散系数时间依赖性常数的关系.结果表明,混凝土中氯离子表观扩散系数随着养护龄期的增加而减小,且减小幅度逐渐减缓;养护龄期与表观扩散系数成幂函数关系.即时扩散系数的时间依赖性常数随着养护龄期的增加而增加,且增加幅度逐渐减小;即时扩散系数时间依赖性常数与养护龄期符合平方根关系.
The natural diffusion test was used to study the apparent diffusion coefficient of chloride ion at different curing ages and the effect of curing age on the apparent diffusion coefficient of chloride ion was analyzed.The apparent diffusion coefficient The instantaneous diffusion coefficient in time is converted into the instantaneous diffusion coefficient, and the relationship between the curing time and the instantaneous diffusion coefficient time-dependent constant is derived.The results show that the apparent diffusion coefficient With the increase of curing age, the decreasing rate decreases gradually, and the age of curing is exponentially exponential with the apparent diffusion coefficient.The time-dependent constant of instantaneous diffusion coefficient increases with the increase of curing age The increase rate decreases gradually; the instantaneous diffusion coefficient time-dependent constant and curing age square root relationship.