Numerical study on the chemical and electrochemical coupling mechanisms for concrete under combined chloride-sulfate attack

Journal article (2023)

Authors

Z. Meng Shanghai Jiao Tong University, Materials and Environment - CEG
Qing feng Liu Shanghai Jiao Tong University
Neven Ukrainczyk Technische Universität Darmstadt
Song Mu Jiangsu Research Institute of Building Science
Yufei Zhang University of Macau
Geert De Schutter Universiteit Gent
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2023 Z. Meng, Qing feng Liu, Neven Ukrainczyk, Song Mu, Yufei Zhang, Geert De Schutter
DOI: https://doi.org/10.1016/j.cemconres.2023.107368
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Cementitious materials exposed to marine and saline environments are commonly threatened by a combined attack of sulfate and chloride ions. This study developed a numerical framework to investigate two combined coupling mechanisms of 1) coupled solid-liquid chemical reactions for competitive chloride-sulfate attack and 2) electrostatic multi-ion coupling effect on reactive-transport mechanisms. Various chemical reactions including sulfate attack with anhydrous calcium aluminates, secondary precipitation of expansive minerals, competitive binding, and calcium leaching have been quantified. The electrostatic potential caused by multi-ions coupling was solved according to constitutive electrochemical laws. After model validation, the chemical coupling mechanisms for solid-liquid reactions during competitive chloride-sulfate binding were investigated. On this foundation, the influence of electrostatic multi-ionic coupling effects on ionic transport and its interaction with chemical coupling were disclosed. It was found that neglecting multi-ions coupling effect would result in an underestimated chemical coupling strength in competitive chloride-sulfate binding.

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