中文摘要：

测定了不同龄期和冻融循环后C30、C35、C40高性能混凝土中氯离子扩散系数,模拟我国北方寒冷地区海洋环境,利用Fick定律计算了100年混凝土保护层厚度。结果表明：冻融循环对混凝土劣化和龄期对混凝土损伤的修复对氯离子渗透性能起到双重影响,导致氯离子扩散系数与标养28 d时氯离子扩散系数产生较大差别,采用标养28 d时氯离子扩散系数计算的混凝土保护层厚度明显偏大。

英文摘要：

The chloride diffusion coefficients of C30、C35、C40 high performance concrete subjected to different freezing-thawing cycles at different ages were measured.The marine environment of the Sea area in the north of China was stimulated to calculate the thickness of concrete protective layer in 100 years using the FICK＇s law.The results indicate that concrete deterioration due to freezing-thawing cycles and reparation of damage with age have double influence on chloride permeability,which causes the chloride diffusion coefficient quite different from that after 28 days standard curing.The thickness of concrete protective layer calculated using the cholide diffusion coefficent after 28 days standard curing exhibits a higher value.