Abstract: Aiming at the demand for green,low-carbon and high-performance materials in deep mine grouting engineer ing,an all-solid waste grouting material system with carbide slag (CS) and red mud (RM) as synergistic activators and blast furnace slag (GGBS) and fly ash (FA) as precursors was developed.The properties of fluidity,setting time and compressive strength were systematically tested,and the types of hydration products,pore structure characteristics and microstructure evolu tion of the materials were revealed by means of X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR), mercury intrusion porosimetry (MIP) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) .The re sults show that under the condition of CS-RM synergistic excitation,the constructed all-solid waste grouting material system has good construction workability and mechanical properties under normal temperature curing conditions,and the 28 d compressive strength can reach 13.90 MPa.The microscopic analysis shows that the system forms a cementation structure dominated by C (A) -S-H gel,with a concentrated pore size distribution and a dense microstructure.The mechanism analysis shows that the rapid release of alkaline components from carbide slag can form a synergistic excitation effect with the active components in red mud,promote the dissolution and recombination of active Si and Al in the precursor,and then generate continuously distributed cementitious products,thereby constructing a dense and stable structural system.The research reveals the internal mechanism of preparing high-performance grouting materials by multi-source solid waste synergistic excitation,which can provide theoreti cal basis and technical reference for green grouting and solid waste resource utilization in deep mine engineering.

Key words: carbide slag,red mud,injecting paste material,hydration mechanism