钢渣微粉浆体材料的活性激发及其充填性能研究

Study on Activation and Filling Performance of Steel Slag Powder Slurry Material

为解决采空区充填成本高、钢渣堆存污染环境等问题,以宏观与微观相结合的方法探究了激发剂对钢渣微粉的活性激发程度,同时分析了激活后钢渣微粉浆体复合材料在采空区充填方面工作性能的影响。钢渣微粉活性经物理与化学相结合的方法激发后,标准稠度用水量、凝结时间、净浆和胶砂试块的抗压强度等性能均有大幅度提升,XRD、SEM分析发现激活后的钢渣微粉经水化后方镁石、石膏衍射峰强度减弱,生成大量C-S-H、钙矾石(Aft)和水化硅酸钙凝胶,同时材料表面空隙减少,致密度提高。此外通过配合比试验确定了激活后钢渣微粉浆体复合材料的配比为CFB粉煤灰∶钢渣微粉∶矿渣粉∶脱硫石膏=65∶20∶10∶5,激发剂掺量为0.75%,并利用采空区裂缝和水下固结模拟试验考察了材料的实际工作性能。综合分析表明材料的各项性能指标均满足采空区的充填要求。

In order to make solutions to the high cost for filling the mined-out area and the pollution caused by the storage of steel slag, this paper studied the activation degree of activator on steel slag powder by means of macro and micro methods, and analyzed the influence of the activated steel slag powder slurry composite material on the filling performance in the mine-out area. After activating the steel slag powder by physical and chemical methods, relevant properties were greatly improved. From the XRD and SEM analysis results, it can be found that,after hydrating the activated steel slag, the diffraction peak intensity of magnesite and gypsum decreased, the surface voids decreased and the density increased. Focusing on the activated steel slag powder slurry composite material, its ratio was determined by the mixing ratio test, and its actual working performance was examined by simulation tests, which showed that all the performance indicators of the material met the filling requirements of the mined-out area.