水泥石灰石粉浆体颗粒群特性与流变性能关系

Relationship between Particle Characteristics and Rheological Properties of Cement Limestone Powder Pastes

关键词:  石灰石粉  粒径分布  堆积密度  水膜厚度  流变性能

Key words:  limestone powder  particles size distribution  packing density  water film thickness  rheological property

摘要:

采用RHEOLAB QC型旋转黏度计测定水泥石灰石粉浆体的流变性能，研究了颗粒群特性（粒径分布和堆积密度）与浆体流变性能的关系，并在此基础上探究了颗粒水膜厚度与浆体流变性能的关系.结果表明：石灰石粉掺入水泥浆体中使颗粒分布变广，颗粒堆积状态得以改善；粒径分布系数与浆体屈服应力、稠度的线性相关性不高，相关系数仅为060061和069962；颗粒堆积密度与浆体屈服应力、稠度呈负线性相关，相关系数分别为083058和084654；颗粒堆积密度与浆体流变性能的相关性高于粒径分布系数；颗粒水膜厚度与浆体流变性能不呈简单线性关系，其中对于掺细度411m2/kg石灰石粉的水泥浆体，其屈服应力和稠度减小，颗粒水膜厚度增大；对于掺细度807、1007m2/kg石灰石粉的水泥浆体，其屈服应力和稠度减小，颗粒水膜厚度先增后减，出现了屈服应力、稠度和颗粒水膜厚度同时减小的现象.

Abstract:

Yield stress and consistency of cement limestone powder pastes were measured by RHEOLAB QC rotational viscometer. The relationship between particle size distribution, packing density and rheological properties was studied. The results show that the addition of limestone powder makes the particle distribution wider and improvement of the state of particle accumulation. The linear correlation between particle size distribution coefficient and yield stress and consistency is not close, the correlation coefficient is only 060061 and 069962 The correlation coefficient between the packing density and the yield stress and consistency is 083058 and 084654, which is closer than that of the particle size distribution coefficient. The relationship between water film thickness and rheological properties cannot be described by linear function, among which the yield stress and consistency of the cement paste with 411m2/kg limestone powder are decreased and the water film thickness is increased. The yield stress and consistency of the cement paste adding limestone fineness powder of 807, 1007m2/kg decrease, the water film thickness first increases and then decreases, and the yield stress, consistency and water film thickness decrease simultaneously.