SIMULATION OF CHLORIDE ION TRANSPORT AND EROSION IN FRACTAL POROUS MEDIA UNDER MULTI-FIELD COUPLING

Ming Ji, Guannan Liu, Boming Yu, >hu Liu and Gaojie Cheng
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Ming Ji: Key Laboratory of Deep Coal Resource Mining, China University of Mining & Technology, Ministry of Education, Xuzhou 221116, P. R. China
Guannan Liu: ��Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, P. R. China‡State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Boming Yu: �Vebleo Fellow, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
>hu Liu: ��State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Gaojie Cheng: ��State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

FRACTALS (fractals), 2023, vol. 31, issue 09, 1-13

Abstract: Concrete is an important part of submarine building structure, which is eroded by hydrostatic pressure and chloride ion. In this study, concrete is regarded as a dually-porous structure composed of pores and fractures. Considering hydrostatic pressure and fractal characteristics of concrete structure, a fractal model is established for chloride ion diffusion under the dual drive of concentration and pressure. Considering the effective stress caused by water pressure in pores of concrete, a fluid–solid model for chloride ion migration is proposed. The fluid–solid coupling fractal model for chloride ion migration was verified by comparing with the experimental data. The numerical simulation results show that: (1) the influence of fractal dimension on the chloride ion diffusion coefficient and chloride ion concentration is nonlinear; (2) compared with low hydrostatic pressure, high hydrostatic pressure has more significant effects on chloride ion concentration and diffusion coefficient; (3) when the effective stress and water pressure in pores are not considered, the diffusion coefficient of chloride ion is always a constant.

Keywords: Chloride Ion Diffusion; Concrete Pore Structure; Hydrostatic Pressure; Fractal Dimension (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1142/S0218348X23501128

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