Optimization of Mix Proportion for Special Cement-Based Materials Used in Coal Mines

Aiming at the problem of high cost of filling materials in the coal mining process, a cement-based high-water material is proposed, and cement is used as the basic cementing material for high-water materials in coal mines. The type of cement is determined by single-factor test, and the orthogonal test design is used as the dependent variable. According to the test results, the mathematical model of the water bleeding rate is obtained by using the response surface analysis method. Combined with the two-factor correlation analysis, the influence of different single factors and two factors on the water bleeding rate is determined. The factors that are more related to the water-cement ratio, fly ash content, and thickener ratio are determined. The mathematical model of strength is established by using the response surface test design with these three factors as independent variables.