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<p>To promote the further application of the new magnesium slag-based complete solid waste backfill material (MFG-CTB), this paper studies the effects of curing temperature and age on the mechanical properties, deformation characteristics, and pore structure characteristics of MFG-CTB through methods such as uniaxial compression tests, MIP, and SEM. On this basis, a correlation analysis between the pore structure and compressive strength was conducted, and a strength prediction model for MFG-CTB was constructed. The results show that increasing the curing temperature can effectively improve the compressive strength of MFG-CTB at different ages, and the improvement range first increases and then decreases with the increase of curing temperature. However, it will prolong the closure time of pores and cracks in MFG-CTB, weaken its plastic deformation capacity, and the post-peak bearing capacity first increases and then decreases with the rise in temperature. The pore structure characteristics of MFG-CTB generally show refined pore size and increased structural complexity with the increase of curing temperature, which is beneficial to the improvement of the strength of the backfill, and this is also verified in the quantitative analysis of the pore structure. However, when the curing temperature exceeds 35&#xa0;°C, the improvement effect on the pore structure of MFG-CTB is not apparent. The compressive strength of MFG-CTB is negatively correlated with pore characteristic parameters and positively correlated with the pore fractal dimension, among which the average pore size, capillary pore fractal dimension, and gel pore volume have the highest correlation with compressive strength. The MFG-CTB compressive strength prediction model established based on this has a better prediction effect than traditional models.</p>

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Analysis of Correlation between Pore Structure and Compressive Strength of Magnesium Slag-Based Tailings Cemented Backfill: Effects of Different Temperatures and Ages

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Xiaobing Yang,
  • Yaobin Qi,
  • Xi Wang,
  • Shenghua Yin,
  • Wei Chen,
  • Jian Yang,
  • Baohang Lu

摘要

To promote the further application of the new magnesium slag-based complete solid waste backfill material (MFG-CTB), this paper studies the effects of curing temperature and age on the mechanical properties, deformation characteristics, and pore structure characteristics of MFG-CTB through methods such as uniaxial compression tests, MIP, and SEM. On this basis, a correlation analysis between the pore structure and compressive strength was conducted, and a strength prediction model for MFG-CTB was constructed. The results show that increasing the curing temperature can effectively improve the compressive strength of MFG-CTB at different ages, and the improvement range first increases and then decreases with the increase of curing temperature. However, it will prolong the closure time of pores and cracks in MFG-CTB, weaken its plastic deformation capacity, and the post-peak bearing capacity first increases and then decreases with the rise in temperature. The pore structure characteristics of MFG-CTB generally show refined pore size and increased structural complexity with the increase of curing temperature, which is beneficial to the improvement of the strength of the backfill, and this is also verified in the quantitative analysis of the pore structure. However, when the curing temperature exceeds 35 °C, the improvement effect on the pore structure of MFG-CTB is not apparent. The compressive strength of MFG-CTB is negatively correlated with pore characteristic parameters and positively correlated with the pore fractal dimension, among which the average pore size, capillary pore fractal dimension, and gel pore volume have the highest correlation with compressive strength. The MFG-CTB compressive strength prediction model established based on this has a better prediction effect than traditional models.