养护龄期对混凝土氯离子扩散系数时间依赖性的影响  

Influence of curing age on time dependence of chloride diffusion coefficient of concrete

作　　者：宋鲁光[1,2] 孙伟[1,2] 高建明[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点试验室,南京211189

出　　处：《东南大学学报（自然科学版）》2015年第6期1151-1154,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623200);国家自然科学基金资助项目(51278096)

摘　　要：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 chloride apparent diffusion coefficients at different immersion time in slag with different curing ages were studied through natural immersion tests. The influence of the curing age on chloride apparent diffusion coefficients was analyzed. And the apparent diffusion coefficient was considered as the integral mean of the instantaneous diffusion coefficients during the testing period, and the obtained apparent diffusion coefficient was transferred to the instantaneous diffusion coefficients. The relationship between the curing age and the constant of time dependence of the instantaneous diffusion coefficient was derived. The experimental results show that the chloride apparent diffusion coefficient decreases with the increase of the curing age and the decrease rate slows down gradually. There is a power function relationship between the apparent diffusion coefficient and the curing age. The constant of time dependency of the instantaneous diffusion coefficient increases with the increase of the curing age and the increase rate slows down gradually. There is a square root relationship between the constant of time dependency of the instantaneous diffusion coefficient and the curing age.

关 键 词：混凝土 表观扩散系数 即时扩散系数 时间依赖性 养护龄期 

分 类 号：TU528[建筑科学—建筑技术科学]