论文部分内容阅读
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 curve of cement-limestone slurry with nano-CaCO_3 was tested by Rheolab QC rotary viscometer. The τ-γ curve was fitted by Herschel-Bulkley rheological model to obtain the dynamic yield stress of slurry, Consistency coefficient and rheological index, and thixotropy area is used to characterize the thixotropy of the slurry. The results show that the dynamic yield stress of cement-limestone slurry decreases with the increase of limestone powder content, and the consistency coefficient increases and the thixotropy first increases and then decreases with the increase of the limestone powder content. The nano-CaCO_3 does not change the rheology of cement-limestone slurry Type, all exhibited shear thinning behavior. With the increase of the content of nano-CaCO 3, the dynamic yield stress and consistency of cement-limestone slurry gradually increased, and the thixotropy decreased. The nano-CaCO_3 improved the rheological properties of cement-limestone slurry Worse, but to enhance its stability.