Full
FENG Zheng (1992-), male, Doctoral candidate. E-mail: fzllufr@163.com
Outline
The interfacial failure characteristic, tensile strength and tensile-strength ratio (the ratio of interfacial tensile strength of wet-joint specimen to that of monolithic specimen) of the ultrahigh performance concrete (UHPC) wet joints were investigated. The results indicate that all the UHPC wet-joint specimens exhibit the brittle failure. Compared to the specimens without steel fiber (the interfacial tensile strength is 2.24 MPa), UHPC wet-joint specimens with steel fiber show a better interfacial bond performance with the interfacial tensile strength of 6.64 MPa and the tensile-strength ratio of 68.6%. When the fiber volume fraction is no more than 2.5%, the interfacial tensile strength, tensile-strength ratio and interface fracture toughness of wet-joint specimens increase with increasing the fiber volume fraction, and the optimum fiber volume fraction is 2.5%. The long fibers have better performances than the short fibers in improving the interfacial tensile strength, tensile-strength ratio and interface fracture toughness of UHPC wet joints, and the profiled fibers perform better than the straight fibers. The ductility of the steel-rebar-reinforced wet-joint specimens is better than that of the unreinforced wet-joint specimens. Increasing the embedment length and interfacial reinforcement ratio is an efficient way to improve the ductility and interfacial tensile strength of UHPC wet joints. When the embedment length of the reinforcement is 6 times as the rebar diameter, the interfacial tensile strength of the wet joints is greater than that of monolithic UHPC. In addition, the simplified tensile stress-relative displacement models were proposed for the UHPC wet-joint interface at different fiber parameters.
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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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