摘要
试验采用Rheolab QC型旋转黏度计测试了掺纳米CaCO_3的水泥-石灰石粉浆体的流变曲线,应用Herschel-Bulkley流变模型对其剪切应力-速度(τ-γ)曲线进行拟合,得到浆体的动态屈服应力、稠度系数和流变指数,并用触变环面积表征浆体的触变性。结果表明:随石灰石粉掺量的增加,水泥-石灰石粉浆体的动态屈服应力逐渐减小,稠度系数增大,触变性先增大后减小;纳米CaCO_3未改变水泥-石灰石粉浆体的流变类型都呈现出剪切稀化行为;随纳米CaCO_3掺量的增加,水泥-石灰石粉浆体动态屈服应力和稠度逐渐增大,触变性减小,纳米CaCO_3使水泥-石灰石粉浆体流变性能变差,但使其稳定性增强。
The rheological curves of the cement-ground limestone paste were determined by Rheolab QC rotation viscometer.Dynamic yield stress,consistency coefficient and rheological index of the paste were obtained by fitting the measuredτ-γcurves based on Herschel-Bulkley model and thixotropy was characterized by the area of thixotropic hysteresis loop.The results indicate that：with the increase of ground limestone content,dynamic yield stress decreases gradually,consistency coefficient increases,while thixotropy increases and then decreases.The addition of nano-CaCO3 has little effect on the rheological type of the cement-ground limestone paste and they both present a shear thinning behavior.With the increase of nano-CaCO3 content,dynamic yield stress and consistency coefficient increase gradually,while thixotropy decreases.The addition of nano-CaCO3 results in a poor rheological properties of the cement-ground limestone pastes but enhances its stability.
作者
肖佳
周书会
王大富
彭扬轩
范波
XIAO Jia;ZHOU Shuhui;WANG Dafu;PENG Yangxuan;FAN Bo(School of Civil Engineering,Central South University,Changsha 410075,China;Communication and Signal Construction Corporation Limited,Changsha 410005,China;School of Civil Engineering,Shangqiu Institute of Technology,Shangqiu 476000,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2018年第8期2185-2190,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51278497)
