The effect of stone waste on the properties of cemented paste backfill using alkali-activated slag as binder

•The novel APB containing SW was proposed.•The effect of SW on the hydration evolution of APB was investigated.•APB samples with SS/SH ratio of 1 exhibited the best mechanical performance.•The formation of gaylussite, pirssonite, and thermonatrite was discussed. The decorative stone processing gener...

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Bibliographic Details
Published in:Construction & building materials 2021-05, Vol.283, p.122686, Article 122686
Main Authors: Zhang, Shiyu, Ren, Fengyu, Zhao, Yingliang, Qiu, Jingping, Guo, Zhenbang
Format: Article
Language:English
Subjects:
Alkali-activated slag
Hydration products
Microstructure
Paste backfill
Stone waste
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Summary:•The novel APB containing SW was proposed.•The effect of SW on the hydration evolution of APB was investigated.•APB samples with SS/SH ratio of 1 exhibited the best mechanical performance.•The formation of gaylussite, pirssonite, and thermonatrite was discussed. The decorative stone processing generates a large amount of stone waste, which is associated with several environmental problems. This paper investigated the potential utilization of the stone waste (mainly containing calcite and dolomite) in the alkali-activated slag based paste backfill (APB). The effects of stone waste fineness, solid mix proportion and sodium hydroxide to sodium silicate ratio (SH/SS) on the fresh and hardened APB were experimentally studied at 7- and 28-day curing time. Results showed that ultra-fine portion (
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2021.122686