Study on the Workability of Highly Doped Coal Gangue Filling and Grouting Materials in Vacuum Mining Area
To alleviate the environmental pollution caused by coal gangue stacking and improve the uti-lization rate of coal gangue,it is considered to adopt high doping of coal gangue to configure the grou-ting material for filling the hollow area.For this reason,orthogonal comparison tests were conducted on the solid phase mass ratio,additives and gangue dosage of filling grouting materials in the hollow zone.A systematic study of the interrelationship between the main physical and mechanical character-istics of the slurry was performed to reveal the influence of mineral admixture,additives,and gangue aggregate dosage on the physical and mechanical properties of high dosage gangue filling grouting ma-terials.The test results show that after the gangue admixture is raised to 100%,it not only increases the compressive strength at the age of 28 d,but also has no obvious deterioration effect on the other properties of the slurry.When 5%calcium carbide slag is added to the slurry mixed with gangue,there is no obvious gain effect on the performance of the slurry,but the slurry mixed with 5%water glass can further improve the strength of the hardened body.With the increase in the content of gyp-sum,the initial solidification time of the slurry is shortened,the flow degree and water precipitation rate decreased,and the compressive strength decreased.The 1%polycarboxylic acid water-reducing agent obviously improves the flow degree of the slurry,but at the same time increases the water ab-sorption rate of the material,and a serious segregation phenomenon of the grouting material is also observed in the process of measuring the setting time.
coal ganguegrouting filling methodsolid-phase mass ratioadditives
万方数据
维普
