Volume 39 Issue 6
Dec.  2025
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Wang Jiale, Feng Bo, Wang Xuean, Zhou Yue. Properties of coal gangue grouting filling material modified by alkaline additives[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 930-938. doi: 10.20265/j.cnki.issn.1007-2993.2024-0355
Citation: Wang Jiale, Feng Bo, Wang Xuean, Zhou Yue. Properties of coal gangue grouting filling material modified by alkaline additives[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 930-938. doi: 10.20265/j.cnki.issn.1007-2993.2024-0355
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Properties of coal gangue grouting filling material modified by alkaline additives

doi: 10.20265/j.cnki.issn.1007-2993.2024-0355
  • 1.

    CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, Shaanxi, China

  • 2.

    China University of Mining and Technology, School of Mechanical and Electrical Engineering, Xuzhou 221116, Jiangsu, China

  • 3.

    Shanmei Hancheng Mining Sangshuping No.2 Well, Hancheng 715407, Shaanxi, China

  • 4.

    Shaanxi Guojiahe Coal Industry Co., Ltd., Baoji 721505, Shaanxi, China

  • Received Date: 2024-08-01
  • Accepted Date: 2025-04-09
  • Rev Recd Date: 2024-11-22
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • According to the problems of geological damage and collapse caused by coal mining, using coal gangue as the main component of mining filling materials can not only achieve large-scale processing of coal gangue, but also achieve the green and efficient management of the goaf. Coal gangue is used as one of the main materials, and the grouting filling material based on coal gangue is prepared under the modification of alkaline additives. The filling performance was analyzed from viscosity, bleeding rate, stone rate, setting time, and mechanical properties of the material. And the microscopical properties of the material were analyzed by XRD, TG-DSC, FT-IR, and SEM. Results show that C-S-H gel and C-(N)-A-S-H gel were formed in the grouting filling material, which brings bonding properties. The increase of the activator can effectively promote the secondary hydration of coal gangue and increase the formation of gel products. The performance of the grouting filling material is good when the coal gangue content is 70%, the activator content is 30%, and the water-cement ratio is 0.7. But the material is not conducive to long-distance pumping due to its high viscosity. The pumping performance of the slurry is good when the coal gangue content is 80%, the activator ratio is 20%, and the water-cement ratio is 1.0. The material has good slurry stability and mechanical properties, which can also reduce costs and achieve green and low-carbon effects.

     

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