天然火山灰-水泥-粉煤灰复合浆体流变性能  

Rheological Properties of Natural Pozzolan-Cement-Fly Ash Composite Slurry

作　　者：侯悦悦 曾晓辉[1] 龙广成[1] 谢友均[1] 肖丙辰 辜英晗 东怀正 潘自立[2] 赵万强[2] 杨江凡 HOU Yueyue;ZENG Xiaohui;LONG Guangcheng;XIE Youjun;XIAO Bingchen;GU Yinghan;DONG Huaizheng;PAN Zili;ZHAO Wanqiang;YANG Jiangfan(School of Civil Egineering,Central South University,Changsha 410083,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Tibet Railway Construction Co.,Ltd.,Lhasa 850000,China)

机构地区：[1]中南大学土木工程学院,长沙410083 [2]中铁二院工程集团有限责任公司,成都610031 [3]西藏铁路建设有限公司,拉萨850000

出　　处：《材料导报》2022年第19期93-98,共6页Materials Reports

基　　金：国家自然科学基金(52078490)。

摘　　要：采用C-LTD80 QC型旋转粘度计研究了天然火山灰-水泥-粉煤灰复合浆体的流变行为,分析了天然火山灰掺量对浆体屈服应力、塑性粘度以及触变性的影响,并采用Zeta电位仪探索其作用机理。结果表明:天然火山灰-水泥-粉煤灰复合浆体流变可分区段用Bingham模型及Herschel-Bulkley模型模拟;天然火山灰粒径分布跨度大,颗粒形状不规则,且密度小于水泥,等质量代替会增加浆体固相体积分数;天然火山灰使水泥浆体Zeta电位降低,浆体中粒子间静电作用力减弱,粒子更易相互吸附黏聚。而粉煤灰颗粒呈球状且表面光滑,使水泥浆体Zeta电位降低,粒子不易相互吸附黏聚。因此天然火山灰-水泥-粉煤灰复合浆体的屈服应力、塑性黏度和触变性随着天然火山灰掺量增加而增加,随粉煤灰的掺量增加而降低。C-LTD80 QC rotary viscometer and Zeta were used to study the rheological behavior of natural pozzolan-cement-fly ash composite slurry.The effect of natural pozzolan content on the yield stress,plastic viscosity and thixotropy of the slurry were analyzed.On the other hand,the mechanism of action was explored by Zeta potential meter.The results show that the rheology of natural pozzolan-cement-fly ash composite slurry can be simulated by the Bingham model and the Herschel-Bulkley model together.Natural pozzolan has a large particle size distribution and irregular particle shape,and its density is less than cement.When equal mass is replaced,it will increase the volume fraction of the solid phase of the slurry;natural pozzolan reduces the Zeta potential of the cement slurry and weakens the electrostatic force between the particles in the slurry.The particles are easier to adsorb,cohesive with each other.The fly ash particles are spherical and have a smooth surface,which reduces the Zeta potential of the cement paste,and the particles are not easy to adsorb and agglomerate each other.Therefore,the yield stress,plastic viscosity and thixotropy of natural pozzolan-cement-fly ash composite slurry increase with the increase of natural pozzolan content,and decrease with the increase of fly ash content.

关 键 词：天然火山灰 天然火山灰-水泥-粉煤灰复合浆体 流变 ZETA电位 

分 类 号：TU528.45[建筑科学—建筑技术科学]