Ratio Optimization of Slag-Based Solid Waste Cementitious MaterialBased on Response Surface Method

Abstract

Abstract: In order to promote the high-value application of iron and steel smelting waste slag,the cementitious material of solid waste was prepared from blast furnace slag,steel slag and desulfurized gypsum,and the ratio optimization of mine filling slurry was carried out.On the basis of exploring the physical and chemical properties of the test raw materials,with the aid of Box-Behnken in the Design-Expert software,17 sets of proportioning tests were designed.Taking steel slag,lime and desulfurized gypsum content as independent variables,and 28 d compressive strength of the backfill as the response value,a response surface polynomial regression model was constructed,and the influence mechanism of independent variable single factor and interaction on the strength performance of backfill based on variance analysis and response surface analysis was studied.The results show that the strength of backfill is highly sensitive to the response of a single factor,and has a strong significant effect on the interaction between factors.The order of significance of single factor is the content of lime,desulphurizing gypsum and steel slag.The interaction between steel slag and lime content is the decisive factor affecting the strength performance of backfill,followed by the interaction between lime and desulfurized gypsum content,and the interaction between steel slag and desulfurized gypsum is the least.The optimum parameters are steel slag content of 40%,lime content of 6%,desulfurization gypsum content of 12% and slag content of 42% (both are mass fraction).Under this parameter,the strength of backfill at 28 d is 4.03 MPa,and the relative error of parallel verification test is 2.83%,which confirmes the accuracy and scientificity of response surface method in optimizing the ratio of all-solid waste cementitious material.

Key words: blast furnace slag, cementitious material, response surface method, regression model, interaction, compressive strength, optimal mix proportion

CLC Number:

TD853

LIU Shulong, LI Gongcheng, LIU Guolei, WANG Fagang, WANG Jie, QI Zhaojun, YANG Jiguang. Ratio Optimization of Slag-Based Solid Waste Cementitious MaterialBased on Response Surface Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 187-193.

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