Full
GOU Hongxiang (1995-), male, Doctoral candidate. E-mail: ghx950823@163.com
Outline
Fine and short steel fiber was orientally distributed in the paste to prepare a ultra-high performance concrete (UHPC). The compressive strength, flexural strength, flexural tensile strength, and the interfacial bonding strength between steel fiber and UHPC matrix of the directionally distributed steel fiber UHPC (D-UHPC) and the disorderly distributed steel fiber UHPC (L-UHPC) at different volume contents of steel fiber were analyzed. The results demonstrate that the compressive strength of L-UHPC firstly increases and then decreases, and the compressive strength of D-UHPC continues to increase as the volume content of steel fiber increases. The flexural strength of both types of UHPCs improves with the increase of the volume content of steel fiber. At the same volume content of steel fiber, the flexural strength of D-UHPC is greater than that of L-UHPC. In the tensile fracture of the specimen, the crack width produced by D-UHPC is narrower than that of L-UHPC, and D-UHPC has more small cracks by dispersing and absorbing loads. The initial cracking deflection, ultimate tensile deflection, initial cracking strength, ultimate tensile strength, and toughness index of D-UHPC all increase, compared to that of L-UHPC at the same volume content of steel fiber. Increasing the embedding angle of the steel fiber decreases the peak value of the pull-out load and increases the deflection corresponding to the peak value of the load, thus indicating that the direction of the steel fiber affects the mechanical properties of UHPC.
30
8
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
