硫酸钠调控石灰激发矿渣-钢渣胶凝体系性能研究  

Study on performance of lime-activated slag-steel slag cementitious system regulated by sodium sulfate

作　　者：王营 顾晓薇[1] 刘剑平 胥孝川[1] 王青[1] WANG Ying;GU Xiaowei;LIU Jianping;XU Xiaochuan;WANG Qing(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China;School of Architecture&Civil Engineering,Shenyang University of Technology,Shenyang 110027,Liaoning,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]沈阳工业大学建筑与土木工程学院,辽宁沈阳110027

出　　处：《建筑科学与工程学报》2025年第2期122-130,共9页Journal of Architecture and Civil Engineering

基　　金：“十三五”国家重点研发计划项目(2019YFC1907202);沈阳市科技局社会治理专项项目(22-322-3-02)。

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。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.

关 键 词：硫酸钠 石灰-矿渣-钢渣胶凝体系 抗压强度 工作性能 水化反应特征 

分 类 号：TU526[建筑科学—建筑技术科学]