The diffusion of chloride ions in hardened cement paste (HCP) under steady-state conditions and accounting for the highly heterogeneous nature of the material is investigated. The HCP microstructures are obtained through segmentation of X-ray images of real samples as well as from simulations using the cement hydration model CEMHYD3D. Moreover, the physical and chemical interactions between chloride ions and HCP phases (binding), along with their effects on the diffusive process, are explicitly taken into account. The homogenized diffusivity of the HCP is then derived through a least square homogenization technique. Comparisons between numerical results and experimental data from the literature are presented.

中文翻译：

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来自微观分析和结合效应的硬化水泥浆中氯化物的扩散率

研究了氯离子在稳态条件下在硬化水泥浆 (HCP) 中的扩散并解释了材料的高度异质性。HCP 微观结构是通过对实际样品的 X 射线图像进行分割以及使用水泥水化模型 CEMHYD3D 进行模拟获得的。此外，明确考虑了氯离子和 HCP 相（结合）之间的物理和化学相互作用，以及它们对扩散过程的影响。然后通过最小二乘均质化技术推导出 HCP 的均质化扩散率。数值结果与文献中的实验数据进行了比较。