冻融环境下混凝土中氯离子传输特性研究  

Study on Chlorion Migration in Concrete Under Freeze-thaw Environment

作　　者：高德军[1,2] 涂晓慧 姚惠芹[3] 高军 GAO Dejun;TU Xiaohui;YAO Huiqin;GAO Jun(Key Laboratory of Disaster Prevention&Mitigation of Hubei Province,China Three Gorges Univ.,Yichang 443002,China;College of Civil&Architecture,China Three Gorges Univ.,Yichang 443002,China;College of Hydraulic Environmental Engineering,China Three Gorges Univ.,Yichang 443002,China)

机构地区：[1]湖北省防灾减灾重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2021年第4期62-65,98,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(51809153)。

摘　　要：冻融损伤和氯盐侵蚀是寒区海洋环境中混凝土耐久性失效的主要原因.通过模拟寒区海洋环境,设计满足一定抗冻要求的引气混凝土,围绕冻融循环次数对混凝土氯离子扩散系数的影响和冻融后氯离子在混凝土中的传输特性进行了试验研究.结果表明:氯离子扩散系数随冻融循环次数的增长呈指数型上升;冻融后混凝土表层氯离子质量分数随侵蚀时间的增长也呈指数型变化.基于研究结果,提出了预测冻融环境下混凝土中氯离子传输进程的仿真分析方法.Freeze thaw damage and chloride corrosion are the main reasons for the durability failure of concrete in marine environment in cold regions. In this paper, air-entrained concrete with certain frost resistance grade was designed to simulate the characteristics of the cold marine environment in North China. The influence of freeze-thaw cycles on chloride diffusion coefficient of concrete and the transmission characteristics of chloride ion in concrete after freeze-thaw were studied. The results show that the chloride diffusion coefficient increases exponentially with the increase of freeze-thaw cycles, and the chloride concentration on concrete surface changes exponentially with the increase of corrosion time. Based on the research results, a simulation analysis method is proposed to predict the chloride ion transport process in concrete under freeze-thaw environment.

关 键 词：冻融损伤 氯离子 扩散 混凝土 试验研究 

分 类 号：TU43[建筑科学—岩土工程]