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。
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.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第18期41-44,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(50479059)
关键词
冻融循环
高性能混凝土
氯离子扩散系数
混凝土劣化
混凝土保护层
freezing-thawing cycles
high performace concrete
chloride diffusion coefficient
concrete deterioration
concrete protective layer
