Abstract: For the concrete structure exposed to chloride environment, the corrosion effect of chloride under the effect of external temperature is very complex, which affects the corrosion process of reinforcement and durability of concrete structures. Therefore, based on the lattice Boltzmann method, the double distribution functions are applied to describe the temperature evolution of concrete and the concentration evolution of chloride respectively, and a numerical model of chloride erosion concrete is established considering the time varying effect of temperature. On this basis, the chloride erosion mechanism and service life of concrete are discussed considering the effects of water-cement ratio, saturation and temperature difference between day and night. The results show that the diffusion coefficient of chloride increases with the increase of water-cement ratio, which intensifies the erosion effect of chloride. The higher the saturation of concrete is, the faster the diffusion rate of chloride is, which reduces the service life of concrete, and the trend tends to be stable when the saturation is more than 75%. In addition, the greater the temperature difference between day and night, the more significant the effect on the diffusion coefficient, but the effect of temperature difference between day and night on the service life of concrete is not obvious.
张跃, 申林方, 王志良, 董武书. 考虑温度时变效应氯离子侵蚀混凝土的格子Boltzmann数值模型[J]. 材料导报, 2021, 35(16): 16035-16041.
ZHANG Yue, SHEN Linfang, WANG Zhiliang, DONG Wushu. Lattice Boltzmann Model of Chlorine Ion Erosion on Concrete Considering the Time Varying Effect of Temperature. Materials Reports, 2021, 35(16): 16035-16041.
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2021, Vol. 35 
