In the sol–gel science, the influence of chemical aging on the fundamental water permeability remains open regarding to the durability performance of cement-based material. To reveal the pure effect of chemical aging, the water permeability and related micro-structural characteristics are measured on water-saturated mature mortars, whose aging is accelerated through heat treatment under water. It is found that, the chemical aging increases the volumetric porosity and coarsens the pore structure to a notable extent, which enlarge water permeability by 2.6–4.9 times. Based on the pore structure obtained through the low-field proton NMR technique, the water permeability is predicted by the Katz–Thompson theory with satisfactory accuracy, quantitatively confirming the direct effects of chemical aging on water permeability. Physically, because of the polymerization and rearrangement of C–S–H gel, cement mortars undergo substantial changes with enlarging radii for both interlayer and gel pores, slightly decreasing interlayer space but remarkably enlarging gel pore space.

在溶胶-凝胶科学中，关于水泥基材料的耐久性能，化学老化对基本透水性的影响仍然是未知的。为了揭示化学老化的纯净效果，在水饱和的成熟砂浆上测量了水渗透性和相关的微观结构特征，这些砂浆通过在水中进行热处理来加速老化。结果发现，化学时效会显着增加体积孔隙率并使孔结构粗化，从而使水渗透率提高2.6-4.9倍。基于通过低场质子NMR技术获得的孔隙结构，通过Katz-Thompson理论以令人满意的精度预测了水渗透率，定量地证实了化学老化对水渗透率的直接影响。身体上