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Outline
Compound portland-sulphoaluminate cement coal-based solid waste grouting material was prepared by using coal gangue and fly ash as raw materials, supplemented by portland cement and sulphoaluminate cement as cementitious materials. By adjusting the mass ratio of portland cement and sulphoaluminate cement, the effects of cement with different mass ratios on the mechanical properties and flow properties of grouting materials were studied. The pore size characteristics of grouting materials were analyzed by nuclear magnetic resonance, and the hydration products of grouting materials were analyzed by scanning electron microscope and energy spectrum. The results show that when the mass ratio of portland cement to sulphoaluminate cement is 3:7, the 28 d compressive strength and flexural strength of the specimen are 17.05 MPa and 5.00 MPa, respectively, the slump is 34.83 cm, the setting time is 174 min, and the comprehensive performance is the best. The main hydration product of the grouting material is C-A-S-H gel, which is mutually reinforced with the skeleton formed by gangue powder aggregate, fly ash, C-S-H gel, which effectively improves the strength of the specimen. The internal pore size of the grouting material is mainly distributed in 0−0.63 μm and 1−4 μm, and the pore size of 0.05−0.4 μm occupies the main position. The research results can provide some theoretical guidance for the development and engineering application of grouting materials.
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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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