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<p>Understanding and mitigating concrete fracture deterioration under non-uniform corrosion is essential to extending the lifespan of structural materials. This paper introduces an innovative electrochemical–chemical–mechanical phase field model to simulate and predict precipitation-induced cracking in concrete. The model uniquely integrates multiple coupled processes: electrochemical reactions, precipitation-induced pressure, transformation of distinct precipitations, concrete cracking, and porosity variations due to both precipitation and cracking. Through an automatic coupling of corrosion-precipitation-damage-diffusion mechanisms, the model captures the complex interactions where porosity changes dynamically with rust precipitation and cracking, impacting the diffusion coefficient and thus influencing fracture behavior. Rust-induced eigenstrain is correlated with precipitation volume fractions, and a phase-field-regularized cohesive zone model effectively describes concrete fracture evolution. Validated against experimental data, the model shows strong accuracy and provides insights through parametric studies on the impact of reaction rate constants, filling coefficients, and oxygen diffusion coefficients on cracking patterns. This model developed is made freely available at <a href="https://github.com/XuruiFang96">https://github.com/XuruiFang96</a> to facilitate further research and practical applications.</p>

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Electrochemical–chemical–mechanical phase field model for non-uniform corrosion-induced cracking considering the rust precipitation

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Xurui Fang,
  • Zichao Pan,
  • Rujin Ma,
  • Airong Chen

摘要

Understanding and mitigating concrete fracture deterioration under non-uniform corrosion is essential to extending the lifespan of structural materials. This paper introduces an innovative electrochemical–chemical–mechanical phase field model to simulate and predict precipitation-induced cracking in concrete. The model uniquely integrates multiple coupled processes: electrochemical reactions, precipitation-induced pressure, transformation of distinct precipitations, concrete cracking, and porosity variations due to both precipitation and cracking. Through an automatic coupling of corrosion-precipitation-damage-diffusion mechanisms, the model captures the complex interactions where porosity changes dynamically with rust precipitation and cracking, impacting the diffusion coefficient and thus influencing fracture behavior. Rust-induced eigenstrain is correlated with precipitation volume fractions, and a phase-field-regularized cohesive zone model effectively describes concrete fracture evolution. Validated against experimental data, the model shows strong accuracy and provides insights through parametric studies on the impact of reaction rate constants, filling coefficients, and oxygen diffusion coefficients on cracking patterns. This model developed is made freely available at https://github.com/XuruiFang96 to facilitate further research and practical applications.