Influence of Coal Gangue on Properties of Coal-Based Solid Waste Geopolymer Grouting Materials
SHI Qizhen
ZHOU Mei
BAI Jinting
ZHANG Kai
LI Dong
Abstract：To clarify how coal gangue(CG)content affects the properties of geopolymer grouting materials,geopolymer grouting material prepared from coal-based solid waste such as CG was selected as the research object.The influence of CG content on the rheological and mechanical properties of coal based solid waste geopolymer grouting materials(CGGM)was systematically studied,and the microstructure of stone body was analyzed by microscopic testing methods such as mercury intrusion porosimetry(MIP),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and scanning electron microscopy(SEM).The results indicate that the stability of CGGM slurry is improved by CG,CGGM slurry is typical viscosity time-varying power-law type fluid,and the fluidity,setting time and compressive strength of CGGM decrease with the increase of coal gangue content.When coal gangue content is 50%(accounting for the precursor),compressive strengths of stone bodies at 3 days and 28 days reaches 2.97 MPa and 8.89 MPa,respectively.CG mainly plays the role of micro aggregate and provides nucleation sites for calcium silicate hydrate(C-S-H)gel in the early stage,and polymerization occurrs in the later stage.Strength is mainly attributed to crystals and gels such as ettringite(AFt),C-S-H,and calcium(sodium)aluminosilicate hydrate(C-(N)-A-S-H).
Keywords：coal ganguegeopolymer grouting materialrheological propertycompressive strengthmicrostructure
Publication Date：2025-08-30
Online Publishing Date：2025-09-05(First online date of this platform, not the publication date of the document)
Pages：8( 717-724 )