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The research explores the use of coal gangue as a sustainable backfill material in mining to support environmental initiatives.

June 13, 2026GelsOpen Access

Collaborative Bearing Mechanism of Sustainable Coal Gangue Geopolymer Gel Backfill–Rock Combination Under Compression

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Randomized trial examines compressive strength in geopolymer gel backfill, suggesting improvements for green mining.

The research explores the use of coal gangue as a sustainable backfill material in mining to support environmental initiatives.
Conducted uniaxial compression tests on coal gangue geopolymer gel backfill–rock combinations.
Evaluated effects of fine gangue content, mass concentration, and binder content.
Utilized digital image correlation and acoustic emission techniques to assess strain and damage.
Compressive strength increased by 33.2% at 40% fine coal gangue content compared to 20% content.
Compressive strength and elastic modulus peaked at 86% mass concentration and 32% binder content, respectively.
Damage evolution showed three stages, with brittle shear fractures dominating specimen failure.

Zhang et al. (2026) studied this question.

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