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This study aims to investigate the weakening of CO 2 -fly ash-based backfill (CFBF) material in cation water. Weakening is determined in an order of Na +  &gt; Ca 2+  &gt; Mg 2+  by slake durability and mechanical properties analysis. Na +  damages the microstructure of CFBF through the ion exchange phenomenon, causing the ejection of tetrahedral calcium. In Ca 2+  and Mg 2+  water, N-M-A-S-H gel is precipitated and filled in openings via a two electrical-layer mechanism, which mitigates the materials from further deterioration. On this basis, the suitable cation type and concentration range are proposed as criteria to implement CFBF in mine-water affected backfill coal mining.

Durability of CO 2 -fly ash-based backfill materials in cation water deterioration