Numerical Simulation of Concrete Sulfate Attack Behavior under Temperature Influence
LI Zhaoguang
WANG Yan
GUO Bingbing
HONG Mengshu
NIU Ditao
Abstract：A reactive-transport model of concrete under sulfate attack was constructed on the basis of Fick's diffusion law and the principle of minimum of Gibbs free energy of the system.The numerical solution of the model was achieved using a sequential non-iterative method by coupling COMSOL and GEMS software through Matlab interface program.The space-time distribution patterns of phase composition,porosity,and all elements and multi ion in sulfate-erosion concrete,considering calcium dissolution under the influence of temperature,were investigated.The results show that the loss of S-containing solid phases caused by concrete expansion and cracking is responsible for the existence of peaks in the S element distribution;due to the poor high-temperature stability of expansive corrosion products,the porosity near the concrete erosion surface decreases with increasing temperature;compared to the mass loss caused by expansion and cracking at 23℃,the mass loss of concrete under high-temperature conditions is mainly attributed to the decrease in the initial pH of the pore solution,resulting in the decomposition of hydration products.
Keywords：sulfate attackreactive-transport modeltemperature influencenumerical simulation
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 315-322 )