ZHANG Gaozhan (1981-), male, Ph. D, Associate Professor. E-mail: gaozhanzhang@126.com
An ultra-high performance concrete (UHPC) with high strength, low shrinkage, strong radiation shielding and impact resistance was prepared, and its performance formation mechanism was analyzed. The results show that the as-prepared low shrinkage radiation shielding UHPC has 28-d compressive strength of > 120 MPa, 28-d flexural strength of > 20 MPa, 180-d shrinkage rate of < 385×10-6, radiation shielding efficiency of 85% and energy consumption for dynamic impact cracking of 5 600 kJ/m3. The high performance of this UHPC is mainly due to the dense-packing design, interfacial strengthening effect of titanium-rich heavyweight slag sand and "pin structure", the combination of internal curing of titanium-rich heavyweight slag sand and shrinkage compensation of expansive agent, the radiation shielding effect of Ba and Fe elements in barite powder/sand, titanium-rich heavyweight slag sand and steel fiber, and the combining toughening effect of steel fiber and polymer fiber.
| 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 |