【摘要】 为解决石灰激发矿渣-钢渣胶凝体系工作性能较差、早期强度较低的问题，将石灰-硫酸钠按摩尔比1∶1组成复合激发剂对矿渣-钢渣胶凝体系进行激发。对比分析在石灰、石灰-硫酸钠两种激发剂下矿渣-钢渣胶凝体系抗压强度、工作性能的异同，并利用X射线衍射仪（XRD）等探究硫酸钠对石灰-矿渣-钢渣胶凝体系水化特征的影响。结果表明：用水胶比为0.4、摩尔比为1∶1的石灰-硫酸钠激发矿渣-钢渣胶凝体系的3 d和28 d抗压强度分别为28.7 MPa和36.5 MPa,较石灰单独激发矿渣-钢渣胶凝体系分别提升155.3%、14.8%,新拌浆体的流动度可提升44.2%,硫酸钠的加入缩短了石灰-矿渣-钢渣胶凝体系的凝结时间；石灰-矿渣-钢渣胶凝体系的水化产物主要为C—（A）—S—H凝胶、方解石、水化碳铝酸钙以及Ca（OH）₂;随着硫酸钠的加入，胶凝体系的傅里叶红外光谱中增加S—O振动谱带，水化碳铝酸钙生成量减少并向钙矾石转化，胶凝体系中水化产物明显增加且相互搭结交错，填充结石体孔洞，使结石体内部更加致密，进而提高矿渣-钢渣胶凝体系的抗压强度；研究成果可为新型低碳胶凝材料的制备以及钢渣的资源化利用提供参考。更多还原

【Abstract】 In order to solve the problem of poor working performance and low early strength of the lime-activated slag-steel slag cementitious system, the slag-steel slag cementitious system was activated with a composite exciter composed of lime to sodium sulfate with the molar ratio of 1∶1. The similarities and differences of compressive strength and workability of slag-steel slag cementitious system under two activators of lime and lime-sodium sulfate were compared and analyzed. X-ray diffraction（XRD） and other testing methods were employed to investigate the influence of sodium sulfate on the hydration characteristics of the lime-slag-steel slag cementitious system. The results show that the 3 d and 28 d compressive strengths of the lime-sodium sulfate activated slag-steel slag cementitious system with a water-binder ratio of 0.4 and a molar ratio of 1∶1 are 28.7 MPa and 36.5 MPa respectively, which are 155.3% and 14.8% higher than those of lime-activated slag-steel slag cementitious system. The fluidity of the fresh slurry can be increased by 44.2%. The addition of sodium sulfate can shorten the setting time of lime-slag-steel slag cementitious system. The hydration products of lime-slag-steel slag cementitious system are mainly C—（A）—S—H gel, calcite, hydrated calcium aluminate and Ca（OH）₂. With the addition of sodium sulfate, the S—O vibration band is increased in the Fourier infrared spectroscopy of the cementitious system, and the amount of hydrated calcium aluminate production decreases and transforms to calcium alumina. The hydration products in the cementitious system are significantly increased and interlocked with each other to fill the pores of the stone body and make the inside of the stone body denser, thus improving the compressive strength of the slag-steel slag cementitious system. The research findings can provide a reference for the preparation of new low carbon cementitious materials and the resource utilization of steel slag.更多还原