维普
万方数据
废弃加气混凝土基胶凝材料协同锂渣制备充填料的研究
Study on the Preparation of Cemented Paste Backfill from Waste Aerated Concrete Cementitious Materials Combined with Lithium Slag
张凯帆 1王晓军 1王长龙 2胡凯建 1白云翼 3陈辰 4付兴帅3
作者信息
- 1. 江西理工大学资源与环境工程学院,江西赣州 341000
- 2. 河北工程大学土木工程学院河北省建筑工程低碳建造与韧性提升重点实验室,河北邯郸 056038;武汉科技大学国家环境保护矿冶资源利用与污染控制重点实验室,武汉 430081
- 3. 河北工程大学土木工程学院河北省建筑工程低碳建造与韧性提升重点实验室,河北邯郸 056038
- 4. 核工业井巷建设集团有限公司,浙江湖州 313001
- 折叠
摘要
针对工业固体废弃物堆存量大、资源化利用率低的问题,本工作尝试以废弃加气混凝土(WAC)、钢渣、矿渣、脱硫石膏、水泥为复合胶凝材料(CCMs),锂渣为细骨料,制备全尾砂绿色矿井充填料.采用粒度分析、力学性能测试、X射线衍射(XRD)及扫描电镜(SEM)等手段研究了WAC活性、充填料性能及CCMs水化机理.结果表明,粉磨40 min的WAC比表面积达到655 m2/kg,其28 d活性指数为81.43％.当CCMs配合比为m(WAC)∶m(钢渣)∶m(矿渣)∶m(脱硫石膏)∶m(水泥)=20∶15∶38∶7∶20、充填料中m(CCMs)∶m(锂渣)=1∶7、料浆质量浓度为83％、m(NaCl)∶m(CCMs)=0.01,充填料3、28 d抗压强度分别为1.7、3.0 MPa.充填料用CCMs的主要水化产物为C-S-H凝胶、Ca(OH)2、钙矶石(AFt)、Friedel 盐.
Abstract
In order to solve the problems of large stock and low utilization rate of industrial solid wastes,this work made a sound attempt to prepare full-tailing green backfill using waste aerated concrete(WAC),steel slag(SS),slag(S),desulfurization gypsum(DG),cement©as composite cementitious materials(CCMs),and lithium slag(LS)as fine aggregates.It investigated the WAC's activity,backfill performance,and CCMs's hydration mechanism by means of particle size analysis,mechanical properties test,XRD,and SEM.The results showed that the WAC grinded for 40 min had a specific surface area of 655 m2/kg and a 28 d activity index of 81.43％.The backfill prepared by using the CCMs with mixing proportion of m(WAC)∶m(SS)∶m(S)∶m(DG)∶m©=20∶15∶38∶7∶20 and by adopting a m(CCMs)∶m(LS)=1∶7,the mass concentration of backfill slurry is 83％,and a m(NaCl)∶m(CCMs)=0.01 achieved 3 and 28 d compressive strengths of 1.7 and 3.0 Mpa,respectively.It was revealed that the hydration products of the CCMs were mainly C-S-H gel,Ca(OH)2,ettringite(Aft)and Friedel salt.
关键词
废弃加气混凝土(WAC)/复合胶凝材料(CCMs)/锂渣/矿井充填料/水化产物Key words
waste aerated concrete(WAC)/composite cementitious materials(CCMs)/lithium slag(LS)/mine backfill/hydration product引用本文复制引用
出版年
2025