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Outline
Adding plastic expansion agent is an effective measure to improve the volume stability of mine grouting materials. By preparing mine grouting materials with plastic expansion agent, the influence of plastic expansion agent on its working performance, rheological properties, mechanical properties and volume stability was investigated. Then, the mechanism was elucidated through the analysis of pore structure and microscopic morphology. The results show that with the increase of plastic expansion agent content, the working performance and rheological property of the grouting materials are improved, the compressive strength and flexural strength decrease, the plastic expansion rate increases gradually at 3 h, but the influence on volume deformation is small in the middle and late stages. The total porosity and average pore size of the hardened slurry are increased significantly after the addition of plastic expansion agent. When the addition rate is higher than 0.12％, the proportion of capillary pores and large pores are increased more. Considering the performance parameter requirements of grouting materials, it is more suitable when the plastic expansion rate is in the range of 0.04％－0.08％.
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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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