Abstract The transport of chloride ions in concrete structures is not only due to diffusion but also to the advective effects of water movements and capillarity, mostly present with wet-dry cycles. These last two phenomena are currently very poorly modelled. A new system based on optical fibres was previously developed to measure the free chloride concentration in the pore solution without damaging the material. This work aims at developing a numerical model simulating the reactive transport of chloride ions by capillarity in a cementitious material, which considers the diffusion of chloride ions and water transport by capillarity, as well as the chloride adsorption by the material with chemical interaction. It led to the analysis of the main phenomena occurring during a capillarity test. In a larger perspective, this study improves the current understanding of the durability of concrete structures exposed to severe environmental conditions.

中文翻译：

---

模拟毛细管效应对胶凝材料中氯离子的反应传输

摘要 氯离子在混凝土结构中的迁移不仅是由于扩散，而且是由于水运动和毛细作用的平流效应，主要表现为干湿循环。后两种现象目前的建模非常差。之前开发了一种基于光纤的新系统，可以在不损坏材料的情况下测量孔隙溶液中的游离氯化物浓度。这项工作旨在开发一个数值模型，模拟胶结材料中毛细管作用对氯离子的反应传输，该模型考虑了氯离子的扩散和毛细管作用下的水传输，以及材料对氯离子的吸附与化学相互作用。它导致了对毛细管测试期间发生的主要现象的分析。从更大的角度来看，