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Volume 30 Issue 8
Aug.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(8): 1560-1572
Shuo Yang, Jiangyu Wu, Hongwen Jing, Xinguo Zhang, Weiqiang Chen, Yiming Wang, Qian Yin, and Dan Ma, Molecular mechanism of fly ash affecting the performance of cemented backfill material, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1560-1572. https://doi.org/10.1007/s12613-023-2658-x
Cite this article as:
Shuo Yang, Jiangyu Wu, Hongwen Jing, Xinguo Zhang, Weiqiang Chen, Yiming Wang, Qian Yin, and Dan Ma, Molecular mechanism of fly ash affecting the performance of cemented backfill material, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1560-1572. https://doi.org/10.1007/s12613-023-2658-x
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研究论文

粉煤灰对胶结充填材料性能影响的分子机理

  • 1)

    中国矿业大学深部岩土力学与地下工程国家重点实验室, 徐州 221116, 中国

  • 2)

    山东科技大学山东省矿山灾害预防控制重点实验室, 青岛 266590, 中国

  • 3)

    高性能土木工程材料国家重点实验室, 江苏省建筑科学研究院有限公司, 南京210008, 中国

  • 4)

    Department of Materials, University of Oxford, Parks Rd, Oxford, OX1 3PH, United Kingdom

  • 5)

    Department of Mechanical, Aerospace and Civil Engineering, School of Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom

  • 6)

    中国矿业大学矿业工程学院, 徐州 221116, 中国



  • 通讯作者:

    吴疆宇    E-mail: wujiangyu@cumt.edu.cn

    张新国    E-mail: zhangxg1229@163.com

文章亮点

  • (1) 研究了粉煤灰含量与养护时间对胶结充填材料宏观力学特性的影响。
  • (2) 再现了水化硅酸钙与粉煤灰组合分子结构的微观力学响应特征。
  • (3) 揭示了粉煤灰对胶结充填材料力学特性增强与劣化的分子机理。
  • 胶结充填材料面临的巨大挑战是难以同时保障其优异的力学特性和低成本。粉煤灰有可能解决这个问题，并进一步替代水泥，有利于低碳发展。然而，它对低水泥用量和低钙体系胶结充填材料的作用机制尚不清楚。因此，本研究进行了单轴压缩、X射线衍射（XRD）和扫描电子显微镜-能谱测试（SEM-EDS），以研究粉煤灰掺量对胶结充填材料力学特性和微观结构的影响。基于试验结果，构建了粉煤灰-水化硅酸钙的分子模型，以再现胶结充填材料的分子结构演变。分析了粉煤灰用量和钙/硅比（Ca/Si比）对胶结基质强度和破坏模式的影响，揭示了粉煤灰对水化硅酸钙的作用机制。结果表明，随着粉煤灰掺量的增大，胶结充填材料的强度先增加后降低，并导致粉煤灰颗粒周围的氢氧化钙衍射强度和Ca/Si比降低。XRD和SEM–EDS结果表明，粉煤灰影响下水化硅酸钙的Ca/Si比随着水化的进行而降低。粉煤灰-水化硅酸钙分子模型表明粉煤灰可以增强水化硅酸钙的硅链，以提高基质强度。然而，过量的粉煤灰将导致这种增强作用的弱化。此外，水分子间的氢键劣化也导致基质强度的降低。低Ca/Si比诱导水分子增加和与Ca2+结合离子键的减少。水分子之间的氢键不能承受高应力，导致强度降低。粉煤灰-水化硅酸钙分子模型的吸水率与粉煤灰用量和Ca/Si比呈负相关。最佳粉煤灰掺量和Ca/Si比的耦合作用导致了合适的吸水率，这进一步影响了煤灰-水化硅酸钙分子结构的失效模式。
    • Research Article

    Molecular mechanism of fly ash affecting the performance of cemented backfill material

    + Author Affiliations
      Abstract
    • The great challenge of cemented tailings backfill (CTB) is difficult simultaneously maintaining its excellent mechanical properties and low cost. Fly ash (FA) can potentially address this problem and further replace cement in favor of low carbon development. However, its mechanism on CTB with low cement dosage and low Ca system remains unclear. Consequently, this study conducted uniaxial compression, X-ray diffraction (XRD), and scanning electron microscopy (SEM)–energy dispersive spectrometer (EDS) tests to investigate the effect of FA dosage on the mechanical property and microstructure of CTB. A molecular model of FA-CSH was constructed to reproduce the molecular structure evolution of CTB with FA based on the test results. The influences of FA dosage and calcium/silica molar ratio (Ca/Si ratio) on the matrix strength and failure model were analyzed to reveal the mechanism of FA on calcium silicate hydrated (C–S–H). The results show that the strength of CTB increases initially and then decreases with FA dosage, and the FA supplement leads to a decrease in Ca(OH)2 diffraction intensity and Ca/Si ratio around the FA particles. XRD and SEM–EDS findings show that the Ca/Si ratio of C–S–H decreases with the progression of hydration. The FA-CSH model indicates that FA can reinforce the silica chain of C–S–H to increase the matrix strength. However, this enhancement is weakened by supplementing excessive FA dosage. In addition, the hydrogen bonds among water molecules deteriorate, reducing the matrix strength. A low Ca/Si ratio results in an increase in water molecules and a decrease in the ionic bonds combined with Ca2+. The hydrogen bonds among water molecules cannot withstand high stresses, resulting in a reduction in strength. The water absorption of the FA-CSH model is negatively correlated with the FA dosage and Ca/Si ratio. The use of optimal FA dosage and Ca/Si ratio leads to suitable water absorption, which further affects the failure mode of FA-CSH.
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