掺纳米偏高岭土水泥浆体的触变性研究  

Study on thixotropy of cement paste mixed with nano-metakaolin

作　　者：张利民 张云升 张宇 ZHANG Limin;ZHANG Yunsheng;ZHANG Yu(The First Branch of Gansu Road and Bridge Construction Group Co.,Ltd.,Lanzhou 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]甘肃路桥建设集团有限公司第一分公司,甘肃兰州730050 [2]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《混凝土与水泥制品》2023年第7期13-17,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(52208249,U21A20150);甘肃省高等教育科技创新基金项目(2022CYZC-25)。

摘　　要：研究了纳米偏高岭土(Metakaolin,以下简称MK)对新拌水泥浆体絮凝结构及触变性的影响,通过测试水泥浆体的流变性能,获取了随时间变化的流变指标(屈服应力、黏度和触变性),测试了不同纳米MK掺量(0、1%、2%、3%)水泥浆体的水化热。此外,基于统计方法,确定了不同纳米MK掺量水泥浆体的絮凝结构重建速率。结果表明:适量的纳米MK(1%~2%)能显著提高水泥浆体的絮凝结构重建速率,并有效改善水泥浆体的触变性。The effect of metakaolin(hereinafter referred to as MK)on the thixotropy of cement paste and the reconstruction rate of the flocculation structure of fresh cement paste were studied.By testing the rheological properties of cement paste,the rheological indexes(yield stress,viscosity and thixotropy)that change with time were obtained,and the hydration heat of cement paste with different nano-MK content(0,1%,2%,3%)was tested.In addition,statistical methods were utilized to determine the flocculation structure reconstruction rate of cement paste with different nano-MK content.The results indicate that appropriate content of nano-MK(1%~2%)can significantly improve the flocculation structure reconstruction rate of cement paste,and effectively enhances the thixotropy of cement pastes.

关 键 词：偏高岭土 新拌水泥浆体 触变性 絮凝结构 

分 类 号：TV423[水利工程—水工结构工程]