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Outline
In order to study the mechanical properties and optimal ratio of carbon nanotube modified superfine cement-based grouting materials, carbon nanotubes, superfine cement, dispersant, defoamator and polyacrylate emulsion were used as raw materials based on three-factor and four-level orthogonal test. The water-cement ratio and the content of carbon nanotubes and polyacrylate emulsion were used as control factors. The viscosity, fluidity, setting time, uniaxial compressive strength and elastic modulus of the grouting slurry were tested. The influence of each factor on each index was determined through range analysis and variance analysis. The uniaxial compressive strength and elastic modulus were selected as the index for coupling, and the coupling value was analyzed by range, variance and multivariate linear regression analysis to obtain the optimal ratio and verify it. The results show that the uniaxial compressive strength and elastic modulus of the test block decrease with the increase of the water-cement ratio. With the increase of carbon nanotube content, the uniaxial compressive strength of the test block increases first and then decreases, and the elastic modulus shows a trend of increasing first, then decreasing and then increasing again. With the increase of polyacrylate emulsion content, the uniaxial compressive strength of the test block increases first and then decreases, and the elastic modulus shows a decreasing trend. After the uniaxial compressive strength and elastic modulus of the test block are normalized, the weight of 0.6:0.4 is added and coupled, and the optimal ratio of grouting materials is obtained by range and variance analysis. Through multivariate linear regression analysis and laboratory test verification, the optimal ratio is water-cement ratio of 0.6, carbon nanotubes content of 0.4%, polyacrylate emulsion content of 2.5%. The research results can provide a reference for the optimal ratio of carbon nanotube-modified superfine cement-based 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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