石灰石粉细度对水泥浆体流变性能的影响

Effects of Ground Limestone Fineness on the Rheological Property of Cement Pastes

关键词:  石灰石粉  细度  浆体结构  流变性能

Key words:  ground limestone  fineness  paste structure  rheological property

摘要:

为研究石灰石粉细度对水泥浆体流变特性的影响，选用旋转黏度计测定了水泥石灰石粉浆体流变性能，采用Herschel Bulkley模型对浆体流变曲线进行拟合得到相关流变参数.结果表明：随石灰石粉细度增加，水泥浆体结构新建能和稠度减小，动态屈服应力增大；增加石灰石粉细度会减小水泥浆体的触变性，延缓水泥浆体触变性的发展，促进水泥浆体瞬时结构恢复能力；随测试时间增加，水泥石灰石粉浆体结构新建能减小，稠度和动态屈服应力增大.

Abstract:

Effects of ground limestone fineness on cement pastes were studied and the rheological properties of cement ground limestone pastes were determined through the rotating viscometer. The related rheological parameters were obtained by fitting paste rheological curves based on Herschel Bulkley model. The results show that new building energy and consistency decreases with the growth of ground limestone fineness, while dynamic yield stress increases at the same time. The growth of ground limestone fineness reduces the thixotropy of cement paste and slows the progression, and promotes the instantaneous structure recovery capability of cement paste. New building energy of cement ground limestone pastes decreases with test time, while consistency and dynamic yield stress increase.