Abstract The recent paper “Dynamic microstructural evolution of hardened cement paste during first drying monitored by 1H NMR relaxometry” authored by I. Maruyama et al. is discussed. Besides the observed transformation of relatively thin gel pores into interlayer pores, it is worth noting that the coarse gel pores and inter-hydrate pores become coarser during drying. Additionally, interlayer pores simultaneously contract during drying at beyond 40% RH. The drying shrinkage of cement-based material may be physically rooted in the remarkable contraction of C-S-H gel, which is also responsible to the considerably lower specific surface area accessible to nitrogen than that to water.

中文翻译：

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I. Maruyama、T. Ohkubo、T. Haji 等人对论文“通过 1H NMR 弛豫测量法监测的首次干燥过程中硬化水泥浆的动态微观结构演变”的讨论。

摘要 I. Maruyama 等人最近发表的论文“通过 1H NMR 弛豫测量监测的首次干燥过程中硬化水泥浆的动态微观结构演变”。进行了讨论。除了观察到相对较细的凝胶孔转变为层间孔外，值得注意的是，粗凝胶孔和水合物间孔在干燥过程中变得更粗。此外，层间孔隙在超过 40% RH 的干燥过程中同时收缩。水泥基材料的干燥收缩可能源于 CSH 凝胶的显着收缩，这也是氮可进入的比表面积远低于水的比表面积的原因。