INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Study on Proportioning and Performance of cemented Body from Multi-source Coal-based Solid Waste Based on RSM-BBD Experiment |
ZHAO Xinyuan1,2, YANG Ke1,2,3,*, HE Xiang1,2, WEI Zhen1,2, YU Xiang1,2, ZHANG Jiqiang1,2
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1 State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, Anhui, China 2 School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China 3 Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230000, China |
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Abstract In this work, the mix proportion of multi-source coal-based solid wastes such as desulfurization gypsum, gasification fine slag and furnace bottom slag was optimized by Box-Behnken Design (BBD) model in response surface methodology (RSM), the mechanical properties, pore structure, thermal stability, and microstructure of the cemented body with the optimal mix proportion were analyzed. The results showed that: (1) the content of gasification fine slag has the greatest influence on the one day strength of the cemented body, the content of desulfurization gypsum has the greatest influence on the three days and seven days strength of the cemented body, and the interaction of the two solid wastes has the most significant influence on the early strength of the cemented body, showing a negative effect; under the condition of mass ratio of 0.4∶1 between fly ash and coal gangue and mass concentration of 80%, the optimal mass mix proportion of desulfurization gypsum, gasification fine slag and furnace bottom slag is 0.2∶0.1∶0.1, and then the compression deformation and failure characteristics of the cemented body with the optimal mix proportion are analyzed. (2) The microscopic characteristics of the cemented body were studied. There are dense and narrow-necked closed pores in the cemented body, with pore diameter ranging from 5 nm to 3.7×105 nm and few micropores, mainly medium and large pores. The endothermic dehydration reaction of free water and crystal water occurs at 55—65 ℃ and 90—120 ℃, the removal of structural water and hydroxyl water and the decomposition of hydration products occur at 600—700 ℃, and the cumulative mass loss at 800 ℃ is about 8%. (3) The hydration reaction in cemented body is mainly cement, and there is no chemical reaction between coal-based solid wastes. The hydration products are a small amount of short rod-shaped ettringite phase and a thin layer of plush C-S-H gel; a small amount of Al3+ in ettringite is replaced by Si4+ and a small amount of SO42- is replaced by CO32-.
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Published: 10 May 2024
Online: 2024-05-13
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Fund:National Key Research and Development Project (2019YFC1904304), Research Project of Institute of Energy, Hefei Comprehensive National Science Center (21KZS217), Anhui Province University Graduate Research Project (YJS20210389). |
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