Chloride Diffusion and Its Model of Shotcrete Lining Structure with Salt-frost Degradation
WANG Jiabin1, WANG Bin1, ZHANG Kaifeng2, LI Heng1
1 School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China; 2 China West Construction North Co., Ltd., Xi’an 710065, China
Abstract: Chloride diffusion of shotcrete lining structure about highway tunnel in marine environment after salt-frost degradation (3.5wt% NaCl solution) were studied by using solid-liquid extraction and potential method. Meanwhile, the influence factors of chloride ion diffusion on salt-frost degradation, mixture parameter and formed method were analyzed. Then, the chloride ion diffusion model was established based on Fick second law. Salt-frost degradation accelerated chloride ion diffused into shotcrete. Shotcrete with small water-binder ratio and low fly ash replacement had lower chloride content and diffusion coefficient. Steel fiber had little effect on improving salt-frost resistance of shotcrete. Chloride content and ion diffusion coefficient of normal concrete were significantly higher than those of shotcrete. Finally, the chloride diffusion model of shotcrete was established, which considering the environmental temperature and capillary pores humidity, salt-frost damage degree and shotcrete mixture parameters.
王家滨, 王斌, 张凯峰, 李恒. 盐冻损伤喷射混凝土衬砌结构氯离子扩散及其模型[J]. 材料导报, 2020, 34(16): 16055-16061.
WANG Jiabin, WANG Bin, ZHANG Kaifeng, LI Heng. Chloride Diffusion and Its Model of Shotcrete Lining Structure with Salt-frost Degradation. Materials Reports, 2020, 34(16): 16055-16061.
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