The moisture transport performance of concrete is a vital factor that affects its durability, and this performance is closely related to the pore structures of the porous materials. In this study, water content profiles of capillary absorption were obtained using X-ray computed tomography technology. Based on the Lucas–Washburn equation, an inverse model was established to deduce the pore size distribution from the water content profiles. The feasibility of the proposed method was demonstrated using a size distribution model of the cement samples with different water-to-cement ratios. The obtained results were compared with the cumulative pore size distribution measured by mercury intrusion porosimetry, which indicated that the two methods exhibited satisfactory consistency.

混凝土的水分输送性能是影响其耐久性的重要因素，并且该性能与多孔材料的孔结构密切相关。在这项研究中，使用X射线计算机断层扫描技术获得了毛细吸收的含水量分布图。基于Lucas-Washburn方程，建立了一个逆模型，以从含水量分布图推断出孔径分布。使用不同水灰比的水泥样品的尺寸分布模型证明了该方法的可行性。将所得结果与通过压汞法测得的累积孔径分布进行了比较，表明这两种方法表现出令人满意的一致性。