中文摘要：

采用Rheolab QC型旋转黏度计研究了水泥–粉煤灰–石灰石粉复合浆体的流变性能,分析了不同粉体含量以及石灰石粉颗粒粒径对复合浆体屈服应力、塑性黏度以及触变性的影响。结果表明：复合浆体中石灰石粉掺量增大或颗粒粒径减小,浆体屈服应力、塑性黏度和触变性均增大;随剪切速率增大,水泥–粉煤灰–石灰石粉复合浆体发生显著的剪切稀化现象,随后塑性黏度渐趋稳定,掺入石灰石粉后,提高了浆体由剪切稀化向塑性黏度逐渐稳定时需要的剪切速率;在水泥–粉煤灰体系浆体中掺入质量分数为20%～40%石灰石粉能够显著改善浆体的流变性能,提高浆体的稳定性。

英文摘要：

The rheological properties of compound pastes with cement–fly ash–limestone powder were determined by a rotation viscometer （mode Rheolab QC）. The influences of the content and particle size of limestone powder on the yield stress, plastic viscosity and thixotropy of the compound pastes were investigated. The results show that the yield stress, plastic viscosity and thixotropy increase with the increase of limestone powder content and the decrease of particle size of limestone powder in the compound pastes. The cement–fly ash–limestone compound pastes appeared a shear thinning behavior when the shear rate increased. The plastic viscosity of pastes became stable when the shear rate further increased. The addition of limestone powder could cause the compound pastes from shear thinning to stable with the increased shear rate. The addition of 20%–40% （in mass） limestone powder could improve the rheological properties and the stability of the cement-fly ash pastes.