Abstract Numerical simulation of chloride diffusion through high-performance binding systems such as limestone-calcined clay cement (LC3) and its comparison to control and fly ash modified concretes is discussed. The simulation framework considers the pore structure of concrete, the concentration-dependence of diffusion coefficient, and Freundlich binding. The LC3 concrete and the companion fly ash concrete exhibit similar service lives (~8× control mixture), despite the LC3 system having a reduced clinker factor than the fly ash concrete (~0.5, as opposed to 0.7). The diffusion model is augmented with a scalar isotropic damage variable that accounts for random distribution of microcracks under fatigue loading (e.g., in a bridge deck). The impact of damage on service life at different stress levels, for the different concretes is elucidated. The modeling approach can be used to evaluate the influence of binder composition and damage on effective service life of chloride-exposed concrete structures, thereby aiding in binder selection.

中文翻译：

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粉煤灰和石灰石煅烧粘土水泥 (LC3) 混凝土中氯化物扩散的模拟以及损坏对使用寿命的影响

摘要 讨论了氯化物通过石灰石煅烧粘土水泥 (LC3) 等高性能粘结系统扩散的数值模拟及其与控制和粉煤灰改性混凝土的比较。模拟框架考虑了混凝土的孔隙结构、扩散系数的浓度依赖性和 Freundlich 结合。LC3 混凝土和配套粉煤灰混凝土的使用寿命相似（~8 倍对照混合物），尽管 LC3 系统的熟料系数比粉煤灰混凝土（~0.5，而不是 0.7）低。扩散模型增加了一个标量各向同性损伤变量，该变量解释了疲劳载荷下微裂纹的随机分布（例如，在桥面板中）。阐明了不同混凝土在不同应力水平下损坏对使用寿命的影响。