Mechanism of Microbial-Assisted Gelling of Solid Waste-Based Gelling Materials
Aiming at the problem of weak gelling effect of solid waste-based gelling materials in filling mining,microbial induced calcite precipitation(MICP)was introduced to improve the gelling effect,and the effects of microbial inoculation,pH value,and curing time of the specimens were analyzed through orthogonal tests.Combined with the uniaxial compression test to prove the feasibility of the MICP technology in the filling mining.The mechanism of MICP in the filling body was investigated by X-ray diffraction,thermogravimetric analysis,and scanning electron microscope test.The conclusions are obtained as follows.Microbial-assisted gelling technology is feasible in filling mining,and the average compressive strength of the filling body samples cured for 3 d and 7 d is increased by 25.1％and 34.9％,respectively.The optimal pH value of MICP-assisted gelling is 9.The MICP can promote the hydration reaction,increase the content of ettringite and other substances in the filling body,and improve the compressive strength of the filling body.The research results provide a theoretical basis for the application of microbial-assisted gelling under similar conditions,and lay a foundation for the application of MICP technology in the field of filling mining.
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