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以机械研磨和化学激发相结合的方法提高钢渣和矿渣的胶凝活性,利用脱硫石膏、氯化钙、电石渣等助剂合理调控水化产物,强化水化过程,开发了一种以钢渣、矿渣为主要成分的全尾砂充填专用胶凝材料。胶凝材料适宜的物料配比为,钢渣35.5%、矿渣35.5%、硅酸盐水泥10%、矿物调控剂19%,胶凝材料28 d抗压强度达到29.47 MPa。适当调整物料配比,可以得到满足不同采空区充填要求的胶凝材料:胶凝材料与尾砂比为1∶5~1∶10,料浆浓度为70%,充填体28 d,抗压强度达1.0~2.8 MPa。借助XRD、SEM对胶凝材料水化产物和强度调控机理进行了分析,结果表明,对胶凝体系强度起到关键作用的物质为水化C-S-H凝胶和不同类型的高水产物(如AFt)。调控剂的合理搭配,强化了钢渣、矿渣水化过程,优化了水化产物构成。
The combination of mechanical grinding and chemical excitation increases the gelation activity of steel slag and slag, and utilizes the additives such as gypsum, calcium chloride and carbide slag to control the hydration products reasonably and strengthen the hydration process. Slag as the main component of the tailings filling special cementitious materials. The suitable material ratio of cementitious material is 35.5% of steel slag, 35.5% of slag, 10% of Portland cement and 19% of mineral regulating agent, and the compressive strength of cementitious material reaches 29.47 MPa at 28 days. Appropriate adjustment of the material ratio can be achieved to meet the requirements of different gob filling material: cementitious material and the ratio of tailings sand 1:5 ~ 1:10, the slurry concentration of 70%, filling 28 d, compression Intensity of 1.0 ~ 2.8 MPa. The results of XRD and SEM showed that the hydration products and strength regulation mechanism of cementitious materials were analyzed. The results showed that the materials which play key roles in the strength of the gelling system are CSH hydrogels and different types of high water products (such as AFt) . Regulator with the reasonable, and strengthen the steel slag, slag hydration process, optimizing the composition of hydration products.