This study aimed to develop a method for the reasonable prediction of chloride ingress into concrete under unsaturated conditions. To achieve this, the connectivity of both the pore networks and the water paths in hardened cement paste were investigated and modeled in the existing numerical analytical system. Previous measurement results for the continuous porosity in hardened cement paste were reorganized, and the relationship between the total porosity and continuous porosity was clarified and formulated as the pore connectivity. In addition, the connectivity of the liquid water in unsaturated pore structures was formulated referring to previous numerical studies, suggesting that the connectivity of the liquid water decreases at a lower degree of saturation. Furthermore, by calculating the chloride transport considering the pore connectivity and the liquid water connectivity under unsaturated conditions, the chloride penetration into unsaturated concrete, including an airborne chloride environment, could be reproduced more realistically than was previously possible.

本研究旨在开发一种在不饱和条件下合理预测氯化物进入混凝土的方法。为了实现这一点，在现有的数值分析系统中研究和模拟了硬化水泥浆体中孔隙网络和水路的连通性。重新整理了以往硬化水泥浆体连续孔隙率的测量结果，阐明了总孔隙率与连续孔隙率之间的关系，并将其表述为孔隙连通性。此外，参考先前的数值研究，不饱和孔隙结构中液态水的连通性被公式化，表明液态水的连通性在较低的饱和度下降低。此外，