¹H NMR is a powerful technique for characterizing the microstructure of cement pastes; however the analysis of the data poses significant challenges. This work presents a comparative analysis of the microstructure evolution in cement pastes using ¹H NMR relaxometry, MIP and thermoporometry. We developed and implemented a cumulative T₂ distribution to improve the reproducibility and robustness of the results obtained from the CPMG raw data. Although NMR and thermoporometry measured similar pore sizes, MIP measured considerable deviations at pores>10 nm for matured white cement pastes, but blends with slag were more comparable. Nevertheless, deviations were observed in the blends when the degree of slag hydration was low. These discrepancies are attributed to the C/(A + S) ratio of C–S–H which decreases with slag hydration. The findings suggest that the pore refinements typically measured with MIP for blended cement compared to reference Portland cement may be an artefact of sample preconditioning.

¹ H NMR 是表征水泥浆体微观结构的一项强大技术；然而，数据分析提出了重大挑战。^{这项工作使用1} H NMR 弛豫测定法、MIP 和热孔隙测定法对水泥浆体的微观结构演变进行了比较分析。我们开发并实施了累积 T ₂分布，以提高从 CPMG 原始数据获得的结果的再现性和稳健性。尽管 NMR 和热孔隙测定法测量的孔径相似，但 MIP 测量熟化白水泥浆体的孔径 >10 nm 时存在相当大的偏差，但与矿渣的混合物更具可比性。然而，当炉渣水化程度较低时，在混合物中观察到偏差。这些差异归因于 C-S-H 的 C/(A + S) 比率，该比率随着炉渣水化而降低。研究结果表明，与参考波特兰水泥相比，通常使用 MIP 测量的混合水泥的孔隙细化可能是样品预处理的人为因素。