基于粉料粒径变化的超硫酸盐水泥力学性能研究

摘要

Effect of slag, gypsum and cement clinker particle diameters on the mechanical property of super sulphated cement (SSC) are studied. In order to obtained some relevant methods of improving SSC mechanical strength, the powder particle size distribution and microstructure of SSC specimens are analyzed by laser particle size analyzer and scanning electron microscope (SEM). The results show that the most remarkable factor of powder to influence SSC mechanical strength is slag particle diameter, there exists opposite change trend between them. The specimens 28 days compressive strength with slag surface area 545m2/kg increased 31.8% to the surface area 227m2/kg. The gypsum surface area range from 350m2/kg to 450m2/kg is favorable, no grind or too much both have adverse effect on mechanical strength. Cement clinker particle diameter has a relatively slight effect on the mechanical strength, grinding surface area to 350m2/kg can meet the requirements of SSC mechanical strength.%研究了超硫酸盐水泥(简称SSC)胶凝材料体系中矿粉、石膏和水泥熟料的粒径变化对其力学性能的影响，借助激光粒度分析仪和扫描电子显微镜分别分析粉料粒度分布和SSC试件的微观形貌，得出从粉料粒径角度提高SSC力学强度的相关方法。研究表明，矿粉粒径对力学强度影响最为明显，随着矿粉粒径变小，力学强度呈现增大的变化趋势。矿粉比表面积为545m2/kg的试件相对于比表面积为227m2/kg的试件28d抗压强度增加31.8%；石膏粉磨至比表面积为350~450m2/kg比较适宜，不磨或粉磨时间过长对力学强度均有不利影响；水泥熟料粒径对力学强度影响相对较小，粉磨至比表面积高于350m2/kg就可以满足SSC的配制强度要求。