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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (3): 845-857.

• Solid Waste and Eco-Materials • Previous Articles     Next Articles

Research Progress and Utilization Status Analysis of Concrete Prepared by Tailings

SHEN Yanjun1,2,3, BAI Zhipeng1,3, HAO Jianshuai1,3, LIAO Taichang4,5, LI Shuguang4,6,7, XU Hanhua8   

  1. 1. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China;
    2. Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China;
    3. Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China;
    4. Science and Technology Innovation Department, China Railway 20th Bureau Group Co., Ltd., Xi’an 710016, China;
    5. China Railway Construction Testing Co., Ltd., Xi’an 710016, China;
    6. Post-doctoral Research Workstation, China Railway 20th Bureau Group Co., Ltd., Xi’an 710016, China;
    7. R&D Center of Plateau Tunnel Construction Technology and Equipment, China Railway 20th Bureau Group Co., Ltd., Xi’an 710016, China;
    8. Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co., Ltd., Kunming 650051, China
  • Received:2020-11-22 Revised:2021-01-04 Online:2021-03-15 Published:2021-04-13

Abstract: At present, the use of tailings to prepare concrete has become a better way to realize the comprehensive recycling and utilization of tailings resource. The current situation of tailing slag discharge and comprehensive utilization was analysed to explore the resource utilization status of tailings as aggregates for concrete preparation. In addition, the research progress of different types of tailing slag for concrete gel materials, coarse and fine aggregates, and modified admixture sand was specifically clarified. Finally, the later development direction of tailings to replace natural building materials was prospected. The current research shows that when tailings partially replace concrete materials, the “volcanic ash effect” and “micro-aggregate effect” exerted by the secondary hydration of fine powder are the main reasons why the strength of tailings concrete is higher than that of ordinary concrete. Because of the small particles, tailings have a limited range of applications as concrete fine aggregates, but they have great potential as micro-powder filling materials or alternative gel materials. Tailings concrete takes advantages of the angularity and hydrophilicity of fine-grained tailings to increase the viscosity of concrete and facilitate the preparation of synthetic aggregates or tunnel shotcrete. The preparation of concrete from tailings greatly alleviates the shortage of building materials and solves the environmental problems caused by tailings stacking, providing a new idea for the development of green building materials in the future.

Key words: tailing, concrete preparation, research progress, comprehensive utilization, secondary hydration

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