CHENG Xiaowei(1977-), male, Ph.D., Professor. E-mail: chengxw@swpu.edu.cn.
Effects of cellulose fiber (CF) and modified cellulose fiber on the mechanical properties, energy evolution, crack propagation and interface failure of cement under dynamic load were investigated by splitting hopkinson pressure bar and high speed-high resolution camera technology. In the third period, the accumulation of specific energy will directly affect the compressive strength of the sample, and the sample with unmodified cellulose fiber (UCF) absorbs more energy and has better compressive strength than the sample with modified cellulose fiber (MCF) at the same fiber incorporation amount. Low-temperature plasma modification can introduce oxygen-containing groups on the surface of cellulose fiber, so that the interface between MCF and cement matrix is more closely bound. The result of this failure is since the modified cellulose fiber-oil well cement composite (MCF-OWC) has a lower compressive strength under dynamic load and a lower crushing degree after failure.
| 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 |