考虑温度时变效应氯离子侵蚀混凝土的格子Boltzmann数值模型

doi:10.11896/cldb.20060213

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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.

Key words： lattice Boltzmann method chloride ion erosion time varying effect of temperature service life

Published: Online: 2021-09-07

CLC number:

TU528

Fund:National Natural Science Foundation of China (11962008,51668028).

About author: Yue Zhang, is a master's degree student in Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology. He has been mainly engaged in research on erosion and durability of cement-based materials.
Linfang Shen, is an associate professor in Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology. She received her Ph. D. in geotechnical engineering from Wuhan Institute of Rock and Soil mechanics, Chinese Academy of Sciences in June 2010.Since 2010, she has been mainly engaged in the research of seepage and dissolution of rock fracture, presided over two National Natural Science Foundation projects, two basic research projects in Yunnan province, and one Chinese Postdoctoral Science Foundation project. She has published more than 20 articles in important journals at home and abroad.

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Cite this article:

ZHANG Yue,SHEN Linfang,WANG Zhiliang, et al. Lattice Boltzmann Model of Chlorine Ion Erosion on Concrete Considering the Time Varying Effect of Temperature[J]. Materials Reports, 2021, 35(16): 16035-16041.

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http://www.mater-rep.com/EN/10.11896/cldb.20060213 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16035

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