Study on the Preparation of Cemented Paste Backfill from Waste Aerated Concrete Cementitious Materials Combined with Lithium Slag
ZHANG Kaifan1, WANG Xiaojun1,*, WANG Changlong2,3,*, HU Kaijian1, BAI Yunyi2, CHEN Chen4, FU Xingshuai2
1 School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 2 Hebei Province Key Laboratory for Low-Carbon Construction and Resilience Enhancement of Construction Engineering, School of Civil Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 3 State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China 4 Nuclear Industry Shaft Construction Group Co., Ltd., Huzhou 313001, Zhejiang, China
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 (C) 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(C)=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.
张凯帆, 王晓军, 王长龙, 胡凯建, 白云翼, 陈辰, 付兴帅. 废弃加气混凝土基胶凝材料协同锂渣制备充填料的研究[J]. 材料导报, 2025, 39(2): 23120264-8.
ZHANG Kaifan, WANG Xiaojun, WANG Changlong, HU Kaijian, BAI Yunyi, CHEN Chen, FU Xingshuai. Study on the Preparation of Cemented Paste Backfill from Waste Aerated Concrete Cementitious Materials Combined with Lithium Slag. Materials Reports, 2025, 39(2): 23120264-8.
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