Optimization of Grouting Material Proportion of Coal Gangue Geopolymer Based on Response Surface Methodology
ZHOU Mei1,2,*, BAI Jinting1,2, GUO Lingzhi1,2, ZHANG Yuzhuo2,3
1 College of Civil Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China 2 Liaoning Provincial Key Laboratory of Coal Gangue Resource Utilization and Energy-saving Building Materials, Fuxin 123000, Liaoning, China 3 College of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Abstract: Coal gangue geopolymer grouting material (CGGM) was prepared with mechanically activated coal gangue, fly ash and cement as main materials, sodium silicate, sodium hydroxide and desulfurization gypsum as activator ligands. The Box-Behnken design of response surface methodology was used to study the effects of coal gangue powder content, sodium silicate modulus and content on the fluidity, setting time and compressive strength of CGGM and reveal the formation mechanism of strength. The regression model was constructed to explore the influence of various factors and their interaction, and the optimal ratio of comprehensive performance was obtained. The results show that the three factors have a significant influence on each response value, and there are some interaction items. Each factor and the response value show a quadratic polynomial model, and the regression coefficient R2 of each model is greater than 0.99. The rationality and fitting of the model are good. The micro-aggregate effect of coal gangue powder and fly ash has a certain contribution to the early strength. With the prolongation of age, the polymerization reaction occurs between them under the action of activator ligand, producing C-(N)-S-A-H gel, etc. Therefore, the formation of CGGM strength mainly comes from C-S-H, AFt and C-(N)-S-A-H. When the coal gangue powder content is 40%, the sodium silicate modulus and content are 1.6 and 12.2%, and the performance of CGGM basically meets the control requirements of mine high-pressure water damage.
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2023, Vol. 37 
