Study on Properties of Nano-SiO2 Blended Cement Pastes for Grouting Soil Nailing
PAN Xiaoyan
ZHANG Guangxing
ZHANG Yanqing
GAO Yongliang
Abstract：Nano-SiO2 blended cement pastes for grouting soil nailing were produced,using hydrophilic nano-SiO2 powders and P · Ⅰ 42.5 cement as raw materials.Bleeding height,slump extension and strength of cement pastes containing different contents of nano-SiO2 powders were measured.Microstructures and composition of nano-SiO2 blended cement pastes at different ages were investigated by X-ray diffractometry(XRD) and thermal gravity-differential thermal analysis(TG-DTA).The results show that bleeding height and slump extension of cement pastes decreased with increasing nano-SiO2 content.By blending nano-SiO2 powders into cement pastes,the flexural strength and compressive strength of hardened cement pastes are enhanced,especially at later age.The optimum nano-SiO2 content is 1.0％-2.0％.Nano-SiO2 blended cement pastes contain less Ca(OH)2 and more C-S-H gel than pure cement paste.
Keywords：nano-SiO2cementgrouting soil nailing
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 255-260 )