Full
Outline
In order to study the strength formation mechanism of sulphoaluminate-based grouting backfill with different additions of fly ash under acidic environments, the early strength development and microstructure evolution of sulphoaluminate-based grouting backfills were characterized by uniaxial compression tests, XRD phase analysis, thermal analysis (TG) and MIP mercury porosimeter pore tests. The results show that when the addition of fly ash in the grouting backfill is 10%, the strength at 1 d of hydration is 11.05 MPa, and the strength at 7 d of hydration reaches 26.73 MPa. When the addition of fly ash is increased to 50%, the strength at 1 d of hydration is only 4.06 MPa, while the strength at 7 d of hydration is 10.05 MPa, which indicates that the strength loss caused by high addition of fly ash is obvious. Under the influence of acidic environment, the strength of grouting backfill of each ratio decreases. The strength loss of sample adding 10% fly ash is 17.60%, 19.36% and 21.42% respectively, and the strength of sample adding 50% fly ash is decreased by 21.01%, 28.89% and 39.45% respectively. High fly ash addition and acidic environment can increase the threshold pore size and porosity of the backfill, resulting in a decrease in the early strength of the backfill. In the actual grouting reinforcement, the negative effects of acidic environment and external additives on the setting rate of the cementitious system and the early strength of the backfill should be fully considered to ensure the grouting reinforcement effect of the coal roadway.
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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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