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采用掺入电石渣压蒸和低温煅烧法对石英岩粉进行表面改性,利用X射线衍射、扫描电镜和能谱分析等测试方法对表面改性石英岩粉的矿物组成、表面形貌、元素组成进行表征,测定了掺表面改性石英岩粉水泥浆体的抗压强度和自收缩性能;通过扫描电镜和压汞仪研究了掺表面改性石英岩粉水泥浆体的微观结构.结果表明:压蒸和低温煅烧改性石英岩粉体的表面分别生成了具有胶凝性的托勃莫来石和β-C_2S,增加了石英岩粉表面的胶凝性,改善了石英岩粉与水泥基体的界面结构,从而降低了水泥浆体的孔隙率和自收缩,提高了掺表面改性石英岩粉水泥浆体的早期强度.
The surface modification of quartzite powder was carried out by the incorporation of carbide slag autoclave and low temperature calcination method. The mineral composition, surface morphology, elemental composition of the surface modified quartzite powder were characterized by X-ray diffraction, scanning electron microscopy and energy spectrum analysis. The microcosmic structure of cement slurry with surface modified quartzite powder was studied by scanning electron microscopy and mercury porosimetry.The results show that : The surface of the modified and low temperature calcined modified quartzite powders are respectively formed with gelation titanic and β-C 2 S, which increase the gelation of the quartzite powder surface and improve the compatibility between the quartzite powder and the cement matrix Interface structure, thereby reducing the porosity and self-shrinkage of cement paste, and improving the early strength of the surface-modified quartzite cement paste.