干湿交替下损伤劣化混凝土内硫酸根离子二维传输行为的数值模拟

doi:10.11896/cldb.24010080

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Abstract The sulphatic service environment with repetitive wetting-drying alternations will bring about severe impact to concretes' durability, so it is of great importance to study the transport mechanism of corrosive ions in concrete subjected to that working condition. Based on the transport mechanism of sulfate ions in unsaturated concrete, a 2D transport-reaction model of sulfate in concrete prism under repetitive wetting-drying alternation was established. In the model, the ion consumption caused by chemical reactions and the influence of chemical damage on ion diffusivity were taken into account. The alternating direction implicit scheme of finite difference method was used to numerically solve the transport model. The model validation was carried out by MATLAB programming, and the calculated results coincided well with the experimental data. On this basis, a numerical simulation was performed to investigate the transport behavior of water and sulfate ions in the unsaturated concrete prism under marine tidal circumstance. The results indicated that, water does not simply evaporate into environment at the drying stage, but is simultaneously transported to the surface layer and the interior of prism. The sulfate ion concentration exhibits a decreasing trend from surface to centre, which is similar to that under continuous immersion, and there is no obvious boundary between ion convection and diffusion zones inside the prism.

Key words： repetitive wetting-drying alternation concrete sulfate ion transport-reaction model numerical solution

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TB321

Fund:Natural Science Foundation of China (52308262),‘Chunhui Plan' Collaborative Research Project of Ministry of Education (HZKY20220199),Ningbo Natural Science Foundation (2023J176),National College Student Innovation and Entrepreneurship Training Program Project (202311058013), Research Project of Department of Education of Zhejiang Province (Y202456336).

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	Articles by authors
	YIN Guangji
	SHAN Ziqi
	WEN Xiaodong
	SHAO Jingjing
	TANG Yujuan
	WANG Nan

Cite this article:

YIN Guangji,SHAN Ziqi,WEN Xiaodong, et al. Numerical Simulation on 2D Transport Behavior of Sulfate Ions in Deteriorated Concrete Under Repetitive Wetting-Drying Alternations[J]. Materials Reports, 2024, 38(19): 24010080-6.

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http://www.mater-rep.com/EN/10.11896/cldb.24010080 OR http://www.mater-rep.com/EN/Y2024/V38/I19/24010080

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