石粉对水泥净浆流变性能的影响研究

Study on the Effect of Stone Powder on Rheological Properties of Cement Paste

为探究石粉对水泥基材料工作性能和凝结硬化的影响,开展了不同岩性石粉对水泥净浆流动度和凝结时间影响的试验研究,分析了掺石粉水泥净浆的流变性能及触变性经时变化特性,分析了石粉亚甲蓝值(MB值)对水泥净浆工作性能的影响规律。研究表明:水泥净浆流动度随着石粉MB值的增大而减小,水泥净浆的塑性粘度和屈服应力与石粉MB值存在较好的线性相关性;石灰石等碳酸盐类石粉的加入可缩短水泥净浆的凝结时间,花岗岩等硅酸盐类石粉的加入会延长水泥净浆的凝结时间。

Experimental studies were carried out on the influence of workability and setting time with the use of different lithology stone powder in cement-based materials.The time-dependent rheological properties and thixotropy of cement paste with stone powder were analyzed.The influence of methylene blue value(MB value)of stone powder on the workability of cement paste was also studied.The results show that the fluidity of cement paste decreases with the increase of the MB value of stone powder,and the plastic viscosity and yield stress of cement paste have a good linear correlation with the MB value of stone powder.The use of carbonate stone powders such as limestone can shorten the setting time of cement paste,while the silicate stone powders such as granite can prolong the setting time of cement paste.