Research on the preparation and properties of ultra-early strength grouting material
LIU Rui
LI Xiuling
BU Tongxing
ZHU Zhendong
Abstract：To study the preparation of ultra-early strength grouting material without external early-strength additives to meet the 6h compressive strength of not less than 30 MPa,sulfur-aluminate cement(SAC)was used to replace part of the ordinary Port-land cement,and the optimal content of SAC was explored.On this basis,the one-factor test and orthogonal test of silica fume,mi-crobeads and redispersible emulsion powder were carried out to study the effects on the fluidity,and physical properties of ultra-early strength grouting material,as well as SEM micro-mechanism analysis.The test results show that:with the increase of SAC dop-ing,the flexural and compressive strength of ultra-early strength grouting material were first increased and then decreased,and the optimal doping is 35％;on this basis,single doping of silica fume,microbeads and redispersible emulsion powder,the flexural and compressive strength of ultra-early strength grouting material were first increased and then decreased,with the optimal doping of sili-ca fume at 7.5％,the optimal doping of microbeads at 1％,and the optimal doping of redispersible emulsion powder at 1％.For the orthogonal test of silica fume,microbeads and redispersible emulsion powder,the optimal content of the three is 5％,5％and 0.5％,respectively;through SEM characterization of microscopic features,when hydrated for 6h,the cementitious material also has high den-sification and compactness,which meet the compressive strength requirement of 30 MPa.
Keywords：ultra-early strengthgrouting materialflexural strengthcompressive strengthmicroscopic characteristic
Publication Date：2024-10-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 8-13 )