Abstract Conceptual analysis is performed to examine the effects of pore features on the water continuity in unsaturated porous systems. The roles of pore features in relative chloride diffusion coefficient (Drc) of mortar specimens at various degrees of water saturation (Sw) were studied based on mercury intrusion porosimetry and resistivity tests. It is found that the role of pore structure in the Drc-Sw relationship is a result of its effect on the water continuity. Porosity and tortuosity are not relevant to the Drc-Sw relationship. A finer pore size distribution or lower pore connectivity tends to result in a lower Drc. The pore size effect on the Drc is pronounced primarily at high Sw, while the Drc is dominated by the pore connectivity at low Sw. Cement mortar with a higher water-to-binder ratio shows larger chloride diffusion at high relative humidity levels but smaller chloride diffusion at low relative humidity levels.

中文翻译：

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不饱和氯化物扩散对胶凝材料孔隙结构的依赖性

摘要 进行概念分析以检查孔隙特征对非饱和多孔系统中水连续性的影响。基于压汞孔隙率和电阻率测试，研究了孔隙特征在不同水饱和度 (Sw) 下砂浆试样的相对氯离子扩散系数 (Drc) 中的作用。研究发现，孔隙结构在 Drc-Sw 关系中的作用是其影响水连续性的结果。孔隙度和曲折度与 Drc-Sw 关系无关。更精细的孔径分布或更低的孔隙连通性往往会导致更低的 Drc。孔径对 Drc 的影响主要在高 Sw 时显着，而 Drc 在低 Sw 时由孔隙连通性主导。