This paper presents an electro-chemo-physical model for analyzing long-term chloride-induced reinforcement corrosion in concrete structures. The integration of electrochemical and thermodynamic analyses enables the proposed model to capture the influence of simultaneous reactions within concrete on the corrosion process. The model is validated against experiments, where the necessity of considering the complicated reactions within concrete in long-term corrosion modeling is underscored. Building upon experimental observations and numerical explorations, a potential corrosion acceleration effect resulting from Friedel's salt dissolution in a longer term of corrosion propagation is discovered. Thereafter, a new qualitative model for describing the reinforcement depassivation process in concrete is proposed, along with discussions on governing mechanisms. From a computational perspective, the study also identifies hematite and magnetite as thermodynamically stable rusts under different concentrations of Fe2+ and O2. The proposed model and discoveries are poised to contribute significantly to scientifically robust predictions of deterioration and remaining service life for aging reinforced concrete structures.

中文翻译：

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用于混凝土反应系统内长期钢筋腐蚀的电化学物理分析


本文提出了一种电化学物理模型，用于分析混凝土结构中长期氯化物诱导的钢筋腐蚀。电化学和热力学分析的集成使所提出的模型能够捕捉混凝土内同时反应对腐蚀过程的影响。该模型在实验中进行了验证，其中强调了在长期腐蚀建模中考虑混凝土内部复杂反应的必要性。基于实验观测和数值探索，发现了 Friedel 盐溶解在较长期腐蚀传播中产生的潜在腐蚀加速效应。此后，提出了一种新的定性模型来描述混凝土中的钢筋去钝化过程，并讨论了控制机制。从计算的角度来看，该研究还将赤铁矿和磁铁矿确定为不同浓度 Fe2+ 和 O2 下的热力学稳定锈。所提出的模型和发现有望为对老化钢筋混凝土结构的劣化和剩余使用寿命的科学稳健预测做出重大贡献。