钢渣基低碳胶凝材料的制备及其性能研究  

Preparation and Properties Study of Steel Slag-based Low Carbon Cementitious Materials

作　　者：叶雁飞 申振伟 李明阳 任晓健[3] 彭健文 高天赐 马伟克 张浩 YE Yanfei;SHEN Zhenwei;LI Mingyang;REN Xiaojian;PENG Jianwen;GAO Tianci;MA Weike;ZHANG Hao(Baowu Environmental Technology(Zhanjiang)Resources Recycling Co.,Ltd.,Zhanjiang 524000,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,China;Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215628,China;School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243032,China;Key Laboratory of Metallurgical Emission Reduction&Resources Recycling,Ministry of Education,Maanshan 243002,China)

机构地区：[1]宝武环科(湛江)资源循环利用有限公司,广东湛江524000 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]江苏永钢集团有限公司,江苏张家港215628 [4]安徽工业大学建筑工程学院,安徽马鞍山243032 [5]冶金减排与资源综合利用教育部重点实验室,安徽马鞍山243002

出　　处：《金属矿山》2024年第12期307-312,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:U23A20605);中国宝武低碳项目(编号:BWLCF-202202);马鞍山市农村与社会发展项目(编号:2022KN-13);安徽省新时代育人质量工程项目(编号:2023qygzz016)。

摘　　要：为实现降碳增效目标,提高工业固废的资源化利用率,以钢渣微粉、S95矿粉、粉煤灰、脱硫石膏等工业固废为原材料制备一种新型钢渣基低碳胶凝材料,探究钢渣基低碳胶凝材料的适宜配方,依据《混凝土用复合掺合料》(JG/T 486—2015)、《水泥胶砂强度检验方法(ISO法)》(GB/T 17671—2021)测试胶砂试件的力学性能,采用X射线衍射(XRD)、差热分析(TG-DTA)、扫描电子显微镜(SEM)等测试方法表征钢渣基低碳胶凝材料胶砂试件的组成及结构,揭示钢渣基低碳胶凝材料胶砂试件的水化机理。结果表明,普通硅酸盐水泥与钢渣基掺合料5∶5配比下,试件的力学性能均低于水泥与钢渣基掺合料7∶3配比下;在水泥与钢渣基掺合料7∶3配比下,胶砂试件活性指数均高于《混凝土用复合掺合料》(JG/T 486—2015)中一级的力学性能;钢渣基低碳胶凝材料最佳配比为水泥与600目钢渣基掺合料7∶3配比下,其胶砂试件养护28 d的抗压强度为47.47 MPa,活性指数为100.8%;胶砂试件早期由针棒状AFt提供骨架强度,后期AFt持续生成,并进一步增长增粗,填充于C—S—H中,彼此包裹,相互支撑,进而提高了钢渣基低碳胶凝材料胶砂试件的力学性能。In order to achieve carbon reduction and efficiency improvement,and improve the resource utilization rate of industrial solid waste,a new type of steel slag-based low-carbon cementitious material was prepared by using industrial solid waste such as steel slag powder,S95 slag powder,fly ash and desulfurization gypsum as raw materials.The suitable formula of steel slag-based low-carbon cementitious material was explored.The mechanical properties of mortar specimens were tested according to composite admixture for concrete(JG/T 486—2015)and cement mortar strength test method(ISO method)(GB/T 17671—2021).The composition and structure of steel slag-based low-carbon cementitious material mortar specimens were characterized by X-ray diffraction(XRD),differential thermal analysis(TG-DTA)and scanning electron microscopy(SEM),and the hydration mechanism of steel slag-based low-carbon cementitious material mortar specimens was revealed.The results show that the mechanical properties of the specimens at the ratio of 5∶5 of ordinary Portland cement and steel slag-based admixture are lower than those at the ratio of 7∶3 of cement and steel slag-based admixture.Under the ratio of cement to steel slag-based admixture of 7∶3,the activity index of mortar specimens is higher than the first-level mechanical properties of composite admixture for concrete (JG/ T 486-2015). The optimum ratio of steel slag-based low-carbon cementitious material is 7∶3 of cement and 600 mesh steel slag-based admixture. The compressive strength of the mortar specimen cured for 28 days is 47. 47 MPa,and the activity index is 100. 8%. In the early stage,the skeleton strength of the mortar specimen is provided by the needle-like AFt,and the AFt continue to generate in the later stage,and further grow and thicken,fill in the C-S-H, wrap and support each other,thereby improving the mechanical properties of the steel slag-based low-carbon cementitious mate-rial mortar specimen.

关 键 词：钢渣微粉 水泥胶砂 胶凝活性 力学性能 低碳 

分 类 号：TD989[矿业工程—选矿]