The purpose of this study is to improve the interfacial performance between the concrete and polymer cement mortar (PCM) by using nano-SiO₂. This study examined the bond properties of the inclusion of nano-SiO₂ in the PCM based on splitting-tensile tests. In addition, the bonding mechanism was investigated with SEM. The results demonstrate that the inclusion of 2% nano-SiO₂ in the PCM is beneficial to compressive strength and microstructure so as to obtain good interfacial bond strength as a repair layer mortar. The results also show that the increase in the surface roughness, the improvement of substrate concrete strength, vertical casting, and wet saturated interface state facilitate bond strength and change the failure mode of nano-SiO₂ PCM/concrete composite specimens. At that time, the interfacial strength is predominantly influenced by the interface roughness and the old concrete strength through one-way analysis of variance. The results of SEM present that the interface of nano-SiO₂ PCM/concrete composite specimen is more compact than that of the PCM/concrete composite specimen due to the transformation of harmful Ca(OH)₂ into more C-S-H gels and the formation of a better polymer film structure at the interface. As a result, mixing nano-SiO₂ into PCM accompanied by adopting effective treatment method of surface and higher compressive strength of substrate concrete is significantly beneficial to bond strength.

这项研究的目的是通过使用纳米SiO ₂来改善混凝土和聚合物水泥砂浆（PCM）之间的界面性能。这项研究基于分裂拉伸试验，研究了PCM中纳米SiO ₂夹杂物的结合性能。另外，用SEM研究了键合机理。结果表明，在PCM中包含2％的纳米SiO ₂有利于抗压强度和微观结构，从而获得良好的界面粘结强度，作为修补层砂浆。结果还表明，表面粗糙度的增加，基材混凝土强度的提高，垂直浇铸和湿饱和界面状态的提高有利于粘结强度并改变纳米SiO ₂的破坏方式PCM /混凝土复合标本。当时，通过单向方差分析，界面强度主要受界面粗糙度和旧混凝土强度的影响。扫描电镜的结果表明，由于有害的Ca（OH）₂转化为更多的CSH凝胶并且形成了CSH凝胶，纳米SiO ₂ PCM /混凝土复合样品的界面比PCM /混凝土复合样品的界面更致密。界面处的聚合物膜结构更好。结果，将纳米SiO ₂混合到PCM中，同时采用有效的表面处理方法和更高的基层混凝土抗压强度，对粘结强度有明显的好处。