Full
Outline
The high content of phosphogypsum gel material has the disadvantages of weak gelling and low strength. Adding lime can improve the gelling and strength of phosphogypsum-based solid waste gel material. Phosphogypsum, steel slag and blast furnace slag were used as raw materials of cementitious materials, lime was used as activator, and tailings were used as aggregate to prepare backfill. The mechanical characteristics, pore characteristics and microstructure of backfill under different lime content were investigated. The fractal theory was introduced to explore the effect of lime on the pore characteristics of phosphogypsum-based solid waste cementitious backfill. The results show that a lime content of 2% increases the 7-day and 28-day strengths of the backfill by 133.33% and 95.83% respectively, which is the best lime content. Excessive lime generates excessive Ca(OH)2 crystals, which causes volume expansion and structural damage of the backfill, thereby reducing its strength. Lime has a significant effect on the small pores in the backfill, especially on the fractal dimension of the pores within 20-200 nm. The strength of the backfill decreases linearly with porosity, decreases exponentially with pore contents in the ranges of 20-100 nm and >200 nm, decreases quadratically with pore content in the range of 100-200 nm, and increases exponentially with the fractal dimension.
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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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