Diffusion model of sulfate ions in concrete based on pore change of cement mortar and its application in mesoscopic numerical simulation

Sulfate attack is a major cause of the deterioration of concrete structures. Accurately predicting the temporal and spatial distribution of sulfate ions in concrete is the basis for revealing the mechanism of concrete performance deterioration caused by sulfate attack. In this article, based on the...

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Bibliographic Details
Published inStructural concrete : journal of the FIB Vol. 23; no. 6; pp. 3786 - 3803
Main Authors Zhuang, Yang, Liu, Xinrong, Zhou, Xiaohan, Du, Libing
Format Journal Article
LanguageEnglish
Published Weinheim WILEY‐VCH Verlag GmbH & Co. KGaA 01.12.2022
Wiley Subscription Services, Inc
Subjects
Cement
cement mortar
Concrete deterioration
Concrete structures
Corrosion
Diffusion
diffusion model
Ion concentration
Mathematical models
mesoscopic model
Mortars (material)
Performance degradation
Spatial distribution
sulfate attack
volume fraction of damage
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Summary:Sulfate attack is a major cause of the deterioration of concrete structures. Accurately predicting the temporal and spatial distribution of sulfate ions in concrete is the basis for revealing the mechanism of concrete performance deterioration caused by sulfate attack. In this article, based on the pore change caused by sulfate damage to cement mortar, a diffusion model of sulfate ions in cement mortar considering changes in surface concentration was established. Furthermore, a two‐dimensional mesoscopic concrete model composed of cement mortar, coarse aggregate, the intrafacial transition zone (ITZ) and macroscopic defects, which can reflect the real aggregate shape, was constructed to study the diffusion of sulfate ions in concrete. The correctness of the model is verified with existing experimental data, and the model is further studied. The results show the following. (1) The average value of the calculation results of multiple sets of models can be used to eliminate the influence of the randomness of the construction of the two‐dimensional mesoscopic concrete model. (2) With increasing stone content, the corrosion depth increases, but the average concentration at a given location decreases. (3) With increasing sulfate solution concentration and water‐cement ratio, the sulfate ion concentration and the corrosion depth in concrete increase.
Bibliography:Funding information
National Natural Science Foundation for Young Scientists of China, Grant/Award Number: 52104076; Science and Technology Foundation of the Department of Transportation of Zhejiang Province, China, Grant/Award Number: 2020028
Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors’ closure, if any, approximately nine months after the print publication.
ISSN:1464-4177
1751-7648
DOI:10.1002/suco.202100760