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Outline
Aiming at the problem of high carbon emission and high cost of traditional cementitious material cement, a new type of cement-fly ash-carbonized steel slag ternary cementitious system (proportion of cement 40%, carbonated steel slag 30%, fly ash 30%) was proposed. Through the synergistic use of industrial solid waste, the goal of low carbon and low cost filling can be achieved. The results are concluded as follows. The reaction between CO2 and active minerals in carbonated steel slag achieves carbon fixation and performance optimization. The flowability of the filling slurry in the cement-fly ash-carbonated steel slag system is better than that in the cement system. The ball rolling effect of fly ash and the optimized gradation of fine particles of carbonated steel slag synergistically enhance the rheological properties of the slurry. Due to the rapid reaction rate of cement, the 3 d compressive strength ratio of cement-fly ash-carbonated steel slag-based backfill to cement-based backfill is 0.45 to 0.65, while fly ash undergoes sustained hydration in the later stage to form hydration gel, the 7 d and 28 d compressive strengths ratio is increased to more than 0.80. The production cost of cement-fly ash-carbonated steel slag system is 22% lower than that of cement system, and the carbon emission is reduced by 63.6%. Through the resource utilization of steel slag, the problems of solid waste storage, filling cost and carbon emission have been solved simultaneously, which provides an innovative technical path for the goal of carbon neutrality in mining industry.
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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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