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<p>To enhance the mining efficiency of coalbed methane, this study investigated the influence of nanomaterials on the sealing performance of cement-based and fly-ash-cement-based systems. The results indicate that a moderate dosage of nano-silica (NS) and nano-metakaolin (NMK) can effectively regulate the setting time, bringing it closer to an optimal range. The compressive strength of the cementitious materials increased significantly with higher NS and NMK content. This improvement is attributed to the enhanced densification of the material’s internal structure. A notable synergistic effect between NS, NMK, and fly ash substantially improved the compressive strength of fly-ash cement, especially its long-term strength. The underlying microscopic mechanism was analyzed using x-ray diffraction (XRD), thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM).The incorporation of nanomaterials did not generate new hydration products. Instead, it promoted the hydration process and increased matrix densification. In the fly-ash system, it facilitated the interaction between fly ash and cement hydration products, strengthened the interfacial transition zone, and improved the overall material performance. Compared to conventional mining sealing materials, the developed materials demonstrated superior gas extraction efficiency and long-term stability, showing significant potential for engineering applications.</p>

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Effects of Nano-Silica and Nano-metakaolin on the Properties of Cement-Based Mining Hole Sealing Materials and their Applications

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Lin Zhang,
  • Yi PingZhang,
  • Xingjia Liu,
  • Shuqi Xu,
  • Xingjie Wu

摘要

To enhance the mining efficiency of coalbed methane, this study investigated the influence of nanomaterials on the sealing performance of cement-based and fly-ash-cement-based systems. The results indicate that a moderate dosage of nano-silica (NS) and nano-metakaolin (NMK) can effectively regulate the setting time, bringing it closer to an optimal range. The compressive strength of the cementitious materials increased significantly with higher NS and NMK content. This improvement is attributed to the enhanced densification of the material’s internal structure. A notable synergistic effect between NS, NMK, and fly ash substantially improved the compressive strength of fly-ash cement, especially its long-term strength. The underlying microscopic mechanism was analyzed using x-ray diffraction (XRD), thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM).The incorporation of nanomaterials did not generate new hydration products. Instead, it promoted the hydration process and increased matrix densification. In the fly-ash system, it facilitated the interaction between fly ash and cement hydration products, strengthened the interfacial transition zone, and improved the overall material performance. Compared to conventional mining sealing materials, the developed materials demonstrated superior gas extraction efficiency and long-term stability, showing significant potential for engineering applications.