Abstract Reinforcement corrosion is one of the most frequent durability problems among ageing concrete structures. Macrocell corrosion is greatly affected by both concrete properties and the steel-concrete interfacial conditions. Inaccurate interpretations of these characteristics lead to unrealistic estimations of early corrosion propagation. Carbonation-induced macrocell corrosion, including the impact of structural defects formed by concrete casting, is addressed in this study. The non-uniform corrosion cell created due to the progressive carbonation of concrete is numerically obtained by combining chemophysical modelling and multiscale homogenisation. The macrocell corrosion under material non-uniformity is then studied by electrochemical modelling based on finite element method. The developed method is first validated against reported experiments to further initiate an in-depth discussion on the significance of material non-uniformity on corrosion modelling either with or without structural defects. The present study is particularly important for advancing the service life monitoring and assessment of ageing concrete structures.

中文翻译：

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混凝土不均匀和结构缺陷下的钢腐蚀建模

摘要 钢筋腐蚀是老化混凝土结构中最常见的耐久性问题之一。宏电池腐蚀受混凝土性能和钢-混凝土界面条件的影响很大。对这些特性的不准确解释导致对早期腐蚀传播的估计不切实际。本研究讨论了碳化引起的宏电池腐蚀，包括混凝土浇筑形成的结构缺陷的影响。由于混凝土逐渐碳化而产生的非均匀腐蚀单元是通过结合化学物理建模和多尺度均质化来数值获得的。然后通过基于有限元方法的电化学建模研究材料非均匀性下的宏电池腐蚀。开发的方法首先根据报告的实验进行验证，以进一步深入讨论材料不均匀性对腐蚀建模的重要性，无论是否存在结构缺陷。本研究对于推进老化混凝土结构的使用寿命监测和评估尤为重要。