A new insight into the interfacial transition zone (ITZ) in cement mortar specimens (CMSs) that is influenced by cement fineness is reported. The importance of cement fineness in ITZ characterizations such as morphology and thickness is elucidated by backscattered electron images and by consequences to the compressive (F_c) and flexural strength (F_f), and porosity at various water/cement ratios. The findings indicate that by increasing the cement fineness the calcium silicate hydrate formation in the ITZ is favored and that this can refine the pore structures and create a denser and more homogeneous microstructure. By increasing cement fineness by about 25% of, the ITZ thickness of CMSs was reduced by about 30% and F_c was increased by 7%–52% and F_f by 19%–40%. These findings illustrate that the influence of ITZ features on the mechanical strength of CMSs is mostly related to the cement fineness and ITZ microstructure.

报告了对受水泥细度影响的水泥砂浆试样 (CMS) 中的界面过渡区 (ITZ) 的新见解。水泥细度在 ITZ 表征（例如形态和厚度）中的重要性通过背散射电子图像以及对抗压强度 ( F _c ) 和抗弯强度 ( F _f ) 以及各种水/水泥比下的孔隙率的影响得到阐明。研究结果表明，通过增加水泥细度，有利于在 ITZ 中形成水合硅酸钙，这可以细化孔隙结构并产生更致密和更均匀的微观结构。通过将水泥细度提高约 25%，CMS 的 ITZ 厚度减少了约 30%，F _c增加了 7%–52%，F _f增加了 19%–40%。这些发现表明，ITZ 特性对 CMSs 机械强度的影响主要与水泥细度和 ITZ 微观结构有关。