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Study on Time-varying Diffusion Model of Chloride Ion in Concrete Under Multi Factor Coupling

XU Lin-lin;ZHOU Shuang-xi;China Railway 18th Bureau Third Engineering Co., Ltd.;School of Civil Engineering and Architecture, East China Jiaotong University;  
Based on Fick's second law and considering the influences of time-varying, chloride binding effect,ambient temperature, concrete deterioration and relative humidity on chloride ion diffusion coefficient, and combining with the initial boundary conditions, 1D, 2D and 3D modified chloride ion diffusion theoretical models were established. By simulating the multi-dimensional diffusion of chloride ion in concrete, the effects of different service life, water-binder ratio and admixture content on chloride ion diffusion were compared and analyzed, and the accuracy of the model was demonstrated through engineering examples and experiments.
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