关键词: 界面;多尺度;偶联剂;水泥;树脂

Abstract: In order to investigate the characteristics of the interface between cement matrix and transparent resin and the modification effect of coupling agent on the interface from multi-scale level, the resin-cement interface was treated with the silane coupling agent A-151 and aluminate coupling agent, respectively.The bonding strength, micro-hardness, microscopic morphology and chemical reaction of resin-cement interface were characterized by the macro, meso and micro scale with the tensile and oblique shear, micro-hardness, fourier transform infrared spectroscopy and environmental scanning electron microscopy tests.The results show that in the macroscopic aspect, silane coupling agent A-151 and aluminum coupling agent can significantly improve tensile and oblique shear bond strength of interface between transparent resin and cement matrix,the 28 d strength at least increased by 73%and 40%.In the mesoscopic aspect,the coupling agent significantly improves the interface micro-hardness of resin-cement,especially in the -10-10 μm range,which reduces the resin performance weakened region thickness up to 100 μm.In the microscopic aspect, the silane coupling agent A-151 and aluminate coupling agent react with hydroxyl(OH)in calcium silicate hydrate(CSH)to form Si-O-Si and Al-O-Si bond,respectively.Two coupling agents can make the interface cement paste and transparent resin tightly integrated to form a whole.The interface adhesion is greatly improved.

Key words: interface;multi-scale;coupling agent;cement;resin