纳米CaCO<sub>3</sub>对水泥-石灰石粉浆体流变作用

肖佳; 周书会; 王大富; 彭扬轩; 范波

doi:10.13801/j.cnki.fhclxb.20171124.001

纳米CaCO₃对水泥-石灰石粉浆体流变作用

1.
中南大学土木工程学院, 长沙 410075;
2.
通号建设集团有限公司, 长沙 410005;
3.
商丘工学院土木工程学院, 商丘 476000

基金项目: 国家自然科学基金（51278497）

详细信息

通讯作者:
肖佳,博士,教授,博士生导师,研究方向为高性能混凝土、新型建筑材料E-mail:jiaxiaog2007@163.com

中图分类号: TU523
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出版历程
- 收稿日期: 2017-08-14
- 修回日期: 2017-11-07
- 刊出日期: 2018-08-14

Rheological properties of cement-ground limestone paste with nano-CaCO₃

1.
School of Civil Engineering, Central South University, Changsha 410075, China;
2.
Communication and Signal Construction Corporation Limited, Changsha 410005, China;
3.
School of Civil Engineering, Shangqiu Institute of Technology, Shangqiu 476000, China

摘要

摘要: 试验采用Rheolab QC型旋转黏度计测试了掺纳米CaCO₃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CaCO₃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CaCO₃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CaCO₃使水泥-石灰石粉浆体流变性能变差，但使其稳定性增强。
- 纳米CaCO₃ /
- 石灰石粉 /
- 动态屈服应力 /
- 稠度系数 /
- 触变性
Abstract: 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 measured τ-γ curves 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.
- nano-CaCO₃ /
- ground limestone /
- dynamic yield stress /
- consistency coefficient /
- thixotropy

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