Chloride Ion Transport in Concrete of Ballastless Track under Fatigue Loading
REN Juanjuan1,2,3, DU Wei2,3, DENG Shijie2,3, FENG Xiang4
1. School of Traffic and Transportation Engineering，Changsha University of Science and Technology，Changsha 410114，China; 2. School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China; 3. MOE Key Laboratory of High-Speed Railway Engineering，Southwest Jiaotong University，Chengdu 610031，China; 4. Guangzhou Metro Design and Research Institute Co.，Ltd.，Guangzhou 510220，China
Abstract：The chloride ion penetration resistance of concrete structure of ballastless track under fatigue load is one of the main factors affecting its service performance. In order to analyze the variation of chloride ion transport in concrete under fatigue load，the bending fatigue loading test of concrete specimens immersed in chloride solution was carried out. A two-field coupling model based on the structural mechanics field and the chloride transport field was then established with COMSOL finite element software to simulate the chloride diffusion behavior in concrete. The results show that when the erosion time is 2 d，the chloride ion diffusion depths corresponding to the stress levels of 0.3，0.5，and 0.7 are 7，11 and 16 mm，respectively，which indicates that the chloride diffusion depth in concrete increases with an increase in fatigue stress level. The chloride ion concentration calculated by the two-field coupling finite element model is basically consistent with the experimental test results，which proves that the model is reasonable. What’s more，the diffusion depth of chloride in concrete increases with the erosion time，and the relationship between them can be described well by a unary quadratic polynomial.
任娟娟, 杜威, 邓世杰, 凤翔. 疲劳荷载下无砟轨道混凝土中氯离子传输研究[J]. 西南交通大学学报, 2021, 56(3): 510-516.
REN Juanjuan, DU Wei, DENG Shijie, FENG Xiang. Chloride Ion Transport in Concrete of Ballastless Track under Fatigue Loading. Journal of SouthWest JiaoTong University, 2021, 56(3): 510-516.
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