Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete

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Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete

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[1]JIN Libing,WANG Zhenhao,WU Tian,et al.Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete[J].Journal of Zhengzhou University (Engineering Science),2024,45(02):121-128.[doi:10.13705/j.issn.1671-6833.2024.02.012]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 02 Page number: 121-128 Column: Public date: 2024-03-06

Title:: Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete

Author(s):: JIN Libing; WANG Zhenhao; WU Tian; XIE Zhiheng; ZHOU Pin; School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China

Keywords:: concrete; sulfate attack; stress level; ion diffusion model; mesoscopic model; numerical simulation

CLC:: TU528

DOI:: 10.13705/j.issn.1671-6833.2024.02.012

Abstract:: In view of the damage to the durability of concrete structures caused by the coupled effects of loading and sulfate attack in coastal and saline soil environments, a numerical model for the sulfate ion diffusion in compressed concrete was proposed. Firstly, based on Fick′s second law, a theoretical diffusion model of sulfate ions in concrete under loading was established by considering the relationship between stress and concrete porosity. Secondly, a three-phase mesoscopic convex polygonal stochastic aggregate model of concrete containing cement mortar, interfacial transition zone, and natural aggregate was established by a self-programmed program, which enabled the mesoscopic simulation of sulfate ions diffusion in compressed concrete. Finally, the validity of the theoretical and mesoscopic models was verified by comparative analysis with the experiment results of full immersion of compressed concrete in a sulfate solution. Then the ion diffusion and damage process of compressed concrete specimens with different water-cement ratios in sulfate solutions of different concentrations were numerically analyzed. The findings indicate that the sulfate ion concentration at the same depth gradually decreased as the compressive stress level increased. The effects of sulfate concentration and the water-cement ratio on sulfate ion diffusion were more evident than with compressive stress. The extent to which compressive stress inhibited ion diffusion was influenced more by the water-cement ratio than by the sulfate concentration. Reducing the water-to-cement ratio appropriately made the compressed concrete more resistant to the sulfate attack.

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Last Update: 2024-03-08