Full
LI Mengyuan (1988-), male, Ph.D., Assistant Researcher. E-mail: limengyu15@tsinghua.org.cn
Outline
The influences of sand ratio and paste aggregate ratio on fresh properties of high-fluidity concrete (HFC) were investigated. Two strength grades of HFC with different sand ratios and paste aggregate ratios were prepared. The fresh properties of HFC were investigated by rheological experiment, workability measurement and sliper test. The results show that the rheological properties and workability of HFC are related to the sand ratio and paste aggregate ratio. The yield stress and plastic viscosity of HFC and the lubrication layer initially firstly decrease and then increase with the increase of sand ratio. With the change of sand ratio of 6.38%, the variation range of yield stress of HFC can be up to about 27%, and the variation range of plastic viscosity can be up to about 78%. The yield stress and plastic viscosity of HFC and the lubrication layer gradually decrease with the increase of paste aggregate ratio. With the change of paste aggregate ratio of 16.07%, the variation range of yield stress of HFC can be up to about 331%, and the variation range of plastic viscosity can be up to about 204%. The varying tendency of workability of concrete is consistent with its rheological properties. A linear relationship between pumping pressure and quantity of flow for concrete predicted by sliper test shows the contribution of the lubrication layer to the process of pumping. The reliability of yield stress of the lubrication layer based on the sliper test is low.
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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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