Abstract
Tailing and waste rock-cemented filling is an effective way to solve the problem solid waste in mines. In this paper, the effects of waste rock content and cement-sand ratio on the properties of tailing-waste rock-cemented filling materials and cemented backfill were analyzed based on the single-factor multi-level experimental design method. The results show that with the increase of waste rock content, the fluidity of the filling slurry increases first and then decreases, the bleeding rate increased gradually, and the compressive strength of the backfill increases first and then decreases. When the waste rock content is 60% and the cement-sand ratio is 1:4, the cemented backfill has higher compressive strength. With the increase of waste rock content, the interface failure area between waste rock particles and cementitious matrix under loading gradually increases, the crack extension is more complex, and the acoustic emission (AE) ringing count is higher. Microstructural analysis showed that the main hydration products in the cemented backfill were calcium silicate hydrated (C-S-H) gels, ettringite (AFt), and calcium hydroxide (Ca(OH)2). Because there is more content of hydration products, the microstructure of the cemented backfill was denser and the compressive strength was higher. Based on the results of uniaxial compression tests, the damage constitutive model of cemented backfill with different waste rock contents and cement-sand ratios was established, which could provide guidance for the design and safety production of phosphate rock filling engineering.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the Key Research and Development Plan of Hubei Province (no. 2020BCA082) and National Natural Science Foundation of China (no. 51804224).
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Guan Chen: conceptualization, methodology, original draft preparation, review and editing. Nan Yao: methodology, review and editing, funding acquisition. Yicheng Ye: conceptualization, reviewing and editing, funding acquisition. Fanghui Fu: methodology, original draft preparation. Nanyan Hu: original draft preparation, review and editing. Zhen Zhang: conceptualization, methodology.
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Chen, ., Yao, N., Ye, Y. et al. Study on mechanical properties and damage characteristics of cemented waste rock-tailing backfill. Environ Sci Pollut Res 30, 102181–102197 (2023). https://doi.org/10.1007/s11356-023-29532-3
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DOI: https://doi.org/10.1007/s11356-023-29532-3