石灰石粉对水泥浆体水化特性及流变性能的影响

利用微量热仪和旋转黏度计，从掺量和细度两方面研究了石灰石粉对水泥浆体水化特性和流变性能的影响.从水化放热速率和放热量角度分析了石灰石粉对水化特性的影响，从紧密堆积理论和固体颗粒体积分数两个角度分析石灰石粉对流变性能的影响.结果表明：石灰石粉可以促进体系的水化进程，且石灰石粉细度越大，促进作用越明显.石灰石粉掺量增大导致水泥含量减少，所以体系第二放热峰峰值和总放热量随石灰石粉掺量的增大而减小.随着石灰石粉掺量或细度的增加，复合体系中固体颗粒的体积分数逐渐增大，粒径分布模数减小，且体系的粒度分布曲线逐渐接近于最密堆积的理想分布曲线.复合体系的屈服应力和塑性黏度随石灰石粉掺量的增大而减小，随石灰石粉细度的增大而增大.
The influence of limestone powder on the hydration characteristics and rheological properties of cement was studied from two aspects of content and fineness by micro calorimeter and rotational viscometer. The influence of limestone powder on the system hydration was analyzed through the rate of hydration heat evolution and hydration heat， while the influence of limestone powder on the rheological properties was analyzed from two angles of close packing and particle volume fraction. The results show that limestone powder can promote the system hydration process， and the greater fineness of limestone powder results in the more obvious promoting effect. The addition of limestone powder leads to the decrease of cement content， so the second exothermic peak and total heat of the system decrease with the increase of limestone powder content. With the increase of limestone powder content or fineness， the volume fraction of solid particles increases gradually， the particle size distribution modulus decreases， and the particle size distribution curve of composite system is close to the ideal distribution curve gradually. The yield stress and plastic viscosity of composite systems decrease with the increase of limestone powder content， but increase with the increase of limestone powder fineness.