Mercury intrusion porosimetry (MIP) is a vital method for assessing the pore structure of cement-based porous materials (CBPMs), but its applicability remains to be clarified. Herein we employed X-ray computed tomography (X-CT) to trace the entrapped mercury in two hardened cement pastes (HCPs) after MIP tests to reassess the method for pore structure characterization. Four different maximum pressures were employed in the MIP tests. Results show that the maximum intrusion pressure had no significant influences on the threshold pore sizes, but impacted the mean pore sizes that were linked to the pore intervals. X-CT can measure the mercury drops entrapped in macro pores. A pore model with the pore structure of thick chamber connected with thin throats was proposed to associate the links between the MIP and X-CT data. The combined uses of MIP and X-CT provide new insights in better understanding MIP results and the possibility for quantitative pore structure characterization of CBPMs.

汞侵入孔隙率法（MIP）是评估水泥基多孔材料（CBPM）孔结构的重要方法，但其适用性尚待阐明。在本文中，我们使用X射线计算机断层扫描（X-CT）来跟踪MIP测试后在两种硬化水泥浆（HCP）中截留的汞，以重新评估孔结构表征方法。在MIP测试中采用了四个不同的最大压力。结果表明，最大侵入压力对阈值孔径没有显着影响，但会影响与孔径间隔相关的平均孔径。X-CT可以测量残留在大孔中的汞滴。提出了一种具有厚腔室与薄喉相通的孔隙结构的孔隙模型，以关联MIP和X-CT数据之间的联系。