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
叶雁飞 1申振伟 2李明阳 2任晓健 3彭健文 4高天赐 4马伟克 4张浩5
作者信息
- 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. 安徽工业大学冶金工程学院,安徽 马鞍山 243032;安徽工业大学建筑工程学院,安徽 马鞍山 243032;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
- 折叠
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.
Abstract
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 ac-cording 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 ad-mixture 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 com-posite 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Key words
steel slag powder/cement mortar/gelling activity/mechanical properties/low carbon引用本文复制引用
出版年
2024
NETL
NSTL
万方数据