水泥-石灰石粉浆体流变和结构建立相关性研究

通过RHEOLAB QC型旋转黏度计测试水泥-石灰石粉浆体动、静态屈服应力,探究了水泥-石灰石粉浆体流变和结构建立之间的相关性.结果表明:水泥浆体的流变与其结构建立紧密相关,流变是特定时间点的动态结构建立特征,其衰减速率反映结构建立性能,水泥浆体流变性能发展呈现Roussel线性增长;随石灰石粉掺量增加,水泥浆体流变性能的衰减速率先增加后减小;动态过程会弱化水泥-石灰石粉浆体的结构建立,相较于动态结构建立,石灰石粉对水泥浆体静态结构建立的促进作用更加明显;水泥-石灰石粉浆体静态结构建立呈Perrot指数增长,随动态过程的增加,其后的水泥-石灰石粉浆体静态结构建立速率先增加后减小;动态过程较长且石灰石粉掺量小于20%时,有利于水泥浆体的流变和结构建立;动态过程较短且石灰石粉掺量达30%时,有利于水泥浆体的流变和结构建立.

Study on Correlation between Rheology and Structural Buildup of Cement Ground Limestone Paste

The dynamic and static yield stress of cement ground limestone paste was tested by RHEOLAB QC rotary viscometer, and the correlation between the rheological and structural buildup of them was explored. The results show that the rheology of cement paste is closely related to its structural buildup, and the rheology is the dynamic structure of cement paste at a specific time point, and the attenuation of dynamic rheological properties reflects the structural buildup. The rheological properties of cement paste show a Roussel linear growth process, and the attenuation rate of rheological properties of cement paste first increase and then decrease after adding limestone powder. The dynamic process weakens the structural buildup of the cement ground limestone paste. Comparing with the dynamic structure, The effect of ground limestone on the static structural buildup of cement paste is more obvious. Increase of the static structural buildup of cement ground limestone paste shows a Perrot exponentially growth. With the increase of dynamic process, the rate of static structural buildup of cement ground limestone paste first increases and then decreases. When the dynamic process is longer, and the ground limestone content is less than 20%, it is beneficial to the rheological and structural properties of the cement paste. When the dynamic process is shorter, and the ground limestone content is 30%, it is beneficial to the rheological and structural properties of the cement paste.