废弃加气混凝土基胶凝材料协同锂渣制备充填料的研究

doi:10.11896/cldb.23120264

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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.

Key words： waste aerated concrete (WAC) composite cementitious materials (CCMs) lithium slag (LS) mine backfill hydration product

Published: 25 January 2025 Online: 2025-01-21

CLC number:

TD853.3

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	Articles by authors
	ZHANG Kaifan
	WANG Xiaojun
	WANG Changlong
	HU Kaijian
	BAI Yunyi
	CHEN Chen
	FU Xingshuai

Cite this article:

ZHANG Kaifan,WANG Xiaojun,WANG Changlong, et al. Study on the Preparation of Cemented Paste Backfill from Waste Aerated Concrete Cementitious Materials Combined with Lithium Slag[J]. Materials Reports, 2025, 39(2): 23120264-8.

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https://www.mater-rep.com/EN/10.11896/cldb.23120264 OR https://www.mater-rep.com/EN/Y2025/V39/I2/23120264

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