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<p>The ratio of aggregates to cementitious materials in cemented backfill is of significant engineering importance for enhanced ground pressure control. This study investigates the strength characteristics of cemented backfill bodies utilizing different backfill aggregates and novel phosphogypsum-based cementitious materials (NPGS). The hydration mechanism during cementation is analyzed, alongside exploratory research into optimizing NPGS proportions. The principal findings are: (i) The full tailings as the backfill aggregate has the lowest strength, the full tailings + rod milling sands aggregate has the highest strength, and the maximum strength is 0.59&#xa0;MPa, when the ratio of full tailing sand to rod milling sands is 3:7; (ii) When the maximum strength, the proportions of quicklime, NaOH and phosphogymsum are 6%, 2% and 50%, respectively. As the proportion of each component increases and decreases, the strength decreases. (iii) Among the NPGS, quicklime and phosphogymsum are used as activators to promote the hydration process, NaOH is used as an early strength agent to promote the hydration reaction by increasing the OH<sup>−</sup> concentration of the slurry, the hydration reaction is promoted and the hydration hardening process is accelerated.</p>

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Effect of backfill aggregates on mechanical behaviour of cemented backfill using novel phosphogymsum based cementitious mateirlas

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月1日

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  • Fusong Dong,
  • Shenghua Yin,
  • Xiaobing Yang,
  • Yaobin Qi

摘要

The ratio of aggregates to cementitious materials in cemented backfill is of significant engineering importance for enhanced ground pressure control. This study investigates the strength characteristics of cemented backfill bodies utilizing different backfill aggregates and novel phosphogypsum-based cementitious materials (NPGS). The hydration mechanism during cementation is analyzed, alongside exploratory research into optimizing NPGS proportions. The principal findings are: (i) The full tailings as the backfill aggregate has the lowest strength, the full tailings + rod milling sands aggregate has the highest strength, and the maximum strength is 0.59 MPa, when the ratio of full tailing sand to rod milling sands is 3:7; (ii) When the maximum strength, the proportions of quicklime, NaOH and phosphogymsum are 6%, 2% and 50%, respectively. As the proportion of each component increases and decreases, the strength decreases. (iii) Among the NPGS, quicklime and phosphogymsum are used as activators to promote the hydration process, NaOH is used as an early strength agent to promote the hydration reaction by increasing the OH− concentration of the slurry, the hydration reaction is promoted and the hydration hardening process is accelerated.