Full
Outline
To address the environmental issues caused by deep mine geothermal hazards and the accumulation of construction waste, waste foam concrete was used as a novel porous support material combined with solid paraffin to prepare phase change thermal storage materials. These materials were used to replace part of the coal gangue at different ratios (referred to as the phase change thermal storage material replacement ratio) as aggregates, and were mixed with cement and fly ash to prepare phase change thermal storage filling body. The microstructural properties of the phase change materials and the filling body were investigated using scanning electron microscopy, while the mechanical and thermal properties of the filling body with different phase change materials were examined. The results indicate that the prepared phase change thermal storage filling body exhibits an uniform and dense microstructure with excellent shape stability, maintaining a stable shape even at elevated temperatures. After comprehensively evaluating the mechanical properties, thermal characteristics, and material economy of the filling body, it is found that at a replacement ratio of 10％, although fluctuations can be observed in compressive strength, thermal storage coefficient, and thermal conductivity, the specific heat capacity has reached saturation. Therefore, controlling the replacement ratio at approximately 10％ is considered the optimal choice. In conclusion, the experimentally developed phase change thermal storage filling body not only meets the compressive strength requirements but also demonstrates excellent thermal conductivity and thermal storage capacity, offering a feasible material solution for geothermal regulation in deep mines and the resource utilization of solid waste.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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