Internal Curing Mechanism of Sepiolite in Cement Paste  

作　　者：许晨席 王彩辉 LI Wenhao SUN Kaili ZHANG Guangxing SUN Guowen KONG Lijuan XU Chenxi;WANG Caihui;LI Wenhao;SUN Kaili;ZHANG Guangxing;SUN Guowen;KONG Lijuan(Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment,Shijiazhuang,050043,China;China State Construction Technical Center,Beijing,101300,China;China Railway 18th Bureau Group Co.Ltd,Tianjin,300222,China)

机构地区：[1]Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment,Shijiazhuang,050043,China [2]China State Construction Technical Center,Beijing,101300,China [3]China Railway 18th Bureau Group Co.Ltd,Tianjin,300222,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第4期857-864,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Natural Science Foundation of China(No.51408380);the Science and Technology Plan of He Bei Province(No.E2021210033);the Scientific and Technological Development Funds of the Central Government Shall Guide Local(No.216Z3801G)。

摘　　要：In order to explore the internal curing mechanism of sepiolite in cement-based materials,the effects of sepiolite on the water consumption of standard consistency,setting time,viscosity,strength,pore structure characteristics,micro-hardness characteristics and two-dimensional surface characteristics of cement paste were studied,respectively.The experimental results show that the water consumption of standard consistency increases linearly with the increase of sepiolite content.The setting time and viscosity are also lengthened and increased with the addition of sepiolite,respectively.When the content of sepiolite exceeds 5%,the strength of the specimen increases significantly.The BET results show that the pore structure of the interfacial transition zone(ITZ)in hardened cement paste(HCP)with sepiolite is optimized after curing for28 d and its pore volume content with below 10 nm is decreased,especially for the specimen with a lower watercement ratio.The characteristics of microhardness and strength of specimens have the same law.Backscattered electron image(BSE-IA)shows that the ITZ of the specimen with sepiolite is denser and the unhydrated cement particles are less than the reference specimen.

关 键 词：SEPIOLITE cement paste internal curing 

分 类 号：TQ172.1[化学工程—水泥工业]