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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。
The chloride ion diffusion coefficients of C30, C35, C40 high performance concrete at different ages and freeze-thaw cycles were measured to simulate the marine environment in cold regions of northern China. The thickness of concrete cover was calculated by Fick’s law for 100 years. The results show that the freeze-thaw cycle has the dual effect on the chloride ion permeability by the deterioration of concrete and age damage on concrete, resulting in a large difference between the chloride ion diffusion coefficient and the chloride ion diffusion coefficient at 28 d. The thickness of concrete cover calculated by chloride ion diffusion coefficient was obviously larger at 28 d.