ZHENG Xiaobo (1994-), male, Master, Engineer. E-mail: zhengxiaobo@cnjsjk.cn
The effect of metakaolin on rheological properties and fiber distribution in static state of ultra-high performance concrete (UHPC) paste with the same fluidity was investigated via rheological test, structural rebuilding rate test and image analysis technology, and the structural rebuilding rate was used to characterize the fiber dispersion properties. The results show that the yield stress of UHPC paste with the same fluidity is basically similar, but the apparent viscosity increases gradually with the increase of metakaolin content (i.e., 5%-10%), while the rheological behavior does not change. The addition of metakaolin can increase the structural rebuilding rate of UHPC paste, but the effect will weaken due to the increase of superplasticizers dosage. It is also indicated that the structural rebuilding rate is closely correlated to the fiber distribution. The higher the structural rebuilding rate is, the better the fiber dispersion will be.
| 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 |