赤泥-高炉矿渣-钢渣三元体系注浆材料试验研究

为解决地下工程灾害治理中大量消耗水泥造成的环境污染、造价高等问题,本文基于协同理论制备了赤泥-高炉矿渣-钢渣基三元体系全固废类注浆材料,系统研究了钢渣对赤泥-高炉矿渣二元体系工作性能、力学强度的作用规律,并结合X射线衍射、傅里叶变换红外光谱、扫描电镜、压汞仪等微观测试手段分析其作用机理。试验结果表明：钢渣对赤泥-高炉矿渣二元体系力学强度具有提升作用,当其掺量为10%时,28 d抗压强度可达12.78 MPa,增幅为59.84%。钢渣经机械粉磨和高温活化后,其协同作用可进一步提高,随着钢渣粒度的减小,浆液结石体力学强度逐渐增强；随着活化温度提升,结石体力学强度呈先增加后减小的趋势。钢渣在10%最优掺量下,活化温度为700 _^oC,粒径为200目时,赤泥-高炉矿渣-钢渣基注浆材料结石体的力学强度最优,28 d强度达到15.1MPa。此外,钢渣的掺入还可以促进赤泥-高炉矿渣基浆液的凝结,凝结时间缩短,浆液的流动性降低。微观分析表明：钢渣可参与赤泥-高炉矿渣体系的水化反应,而且钢渣微粒在浆液结石体中具有充填效应,使结石体更加密实,进而提高结石体力学强度；此外,在高温条件下,钢渣中生成钙芒硝,硅酸二钙,硅酸三钙,铝酸钙胶凝矿物,可促进钙矾石和水合铝酸钙的生成,对强度具有提升作用。

Experimental Study on Grouting Material of Red Mud-blast Furnace Slag-steel Slag Ternary System

In order to solve the problems of environmental pollution and high cost caused by a large amount of cement consumed in the treatment of underground engineering disasters, this paper prepared the red mud- blast furnace slag- steel slag based ternary system solid waste grouting materials based on the synergetic theory, and systematically studied the effect of steel slag on the working performance and mechanical strength of the red mud- blast furnace slag binary system, combined with X-ray diffraction and Fourier transform infrared light. The mechanism was analyzed by means of spectrum, SEM and mercury porosimetry. The results show that the steel slag can enhance the mechanical strength of the binary system of red mud- blast furnace slag. When the content of steel slag is 10%, the compressive strength can reach 12.78 MPa in 28 days, with an increase of 59.84%. After mechanical grinding and high temperature activation, the synergistic effect of steel slag can be further improved. With the decrease of steel slag particle size, the physical strength of slurry paste matrix gradually increases; with the increase of activation temperature, the physical strength of stone first increases and then decreases. When the activation temperature is 700 _^oC and the particle size is 200 mesh, the mechanical strength of the stone body of red mud blast furnace slag steel slag based grouting material is the best, and the strength reaches 15.1MPa in 28 days. In addition, the addition of steel slag can also promote the setting of red mud blast furnace slag based slurry,