Coupled Transport of Sulfate and Chloride Ions With Adsorption Effect: A Numerical Analysis

In the marine environment, reinforced concrete will suffer from chloride ion erosion and sulfate ion erosion at the same time. However, most scholars only study the interaction mechanism between chloride ion and sulfate ion, and the consideration of physical adsorption and chemical combination cause...

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Bibliographic Details
Published inFrontiers in materials Vol. 7
Main Authors Xu, Jun, Mo, Rui, Wang, Penggang, Zhou, Jiguo, Dong, Xiaojin, She, Wei
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 17.09.2020
Subjects
chemical binding
coupled transport
free chloride ion
mathematical model
physical adsorption
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Summary:In the marine environment, reinforced concrete will suffer from chloride ion erosion and sulfate ion erosion at the same time. However, most scholars only study the interaction mechanism between chloride ion and sulfate ion, and the consideration of physical adsorption and chemical combination caused by hydration products is not perfect. Based on the law of conservation of mass, this study integrates the relationship between porosity and hydration time, the weakening of chemical binding of sulfate ions to chloride ions into the mathematical model, establishes the coupling transport model of sulfate and chloride, and verifies the rationality of the model by comparing with the measured data. And then, the physical adsorption and chemical binding of chloride ions under the action of sulfate ions were quantitatively analyzed. It is found that chemical binding is dominant and sulfate ion will reduce the chemical binding effect of chloride ion. With the decrease of the initial water/cement ratio, the diffusion depth of free chloride ion will also decrease.
ISSN:2296-8016
2296-8016
DOI:10.3389/fmats.2020.536517