颗粒间作用力对水泥-石灰石粉浆体屈服应力的影响机制  

Effect of Interparticle Forces on Yield Stress of Cement-Ground Limestone Pastes

作　　者：肖佳[1] 韩凯东 张泽的 田承宇 徐勇[2] XIAO Jia;HAN Kaidong;ZHANG Zedi;TIAN Chengyu;XU Yong(School of Civil Engineering, Central South University, Changsha 410075, China;China Hydropower Engineering Bureau 8 Co., Ltd., Changsha 410004, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中国水利水电第八工程局有限公司,湖南长沙410004

出　　处：《建筑材料学报》2020年第6期1259-1264,共6页Journal of Building Materials

基　　金：中南大学研究生科研创新项目(2020zzts625)。

摘　　要：通过RHEOLAB QC型旋转黏度计测试了水泥石灰石粉浆体的屈服应力,采用EDLVO理论定量分析了浆体颗粒间作用力,探究了颗粒间作用力对浆体屈服应力的影响机制.结果表明:颗粒间的范德华力是主要的远程力,而在近程时静电力和水合作用力也具有重要作用;浆体总颗粒间作用力的差异主要由颗粒表面间距决定;当D-F拟合度增加时,总颗粒间作用力表现为排斥力先增后减,屈服应力先减后增.The yield stress of cement-ground limestone pastes was tested by RHEOLAB QC viscometer,and the interparticle force was quantitatively analyzed by EDLVO theory,and the influence of interparticle forces on the yield stress of pastes was investigated.The results show that with the increase of separation distance,the Van Der Waals force between particles decreases at a quadratic rate while the electrostatic force and hydration force decrease at an exponential rate.The difference of total interparticle force is mainly determined by the separation distance.When D-F fitting degree increases,the repulsive force in total interparticle forces first increases and then decreases,and the yield stress first decreases and then increases.

关 键 词：石灰石粉 颗粒间作用力 屈服应力 颗粒表面间距 

分 类 号：TU528.01[建筑科学—建筑技术科学]