Full
SU Jie (1979-), male, Ph. D., Associate Professor. E-mail: iamsujie@163.com
Outline
The flexural strength of ultra-high performance concrete prism specimens with three kinds of strength grades, two types of steel fibers and four groups of fiber contents was determined to investigate the effects of strength grade, steel fiber and fiber content on the flexural strength and its size effect of ultra-high performance concrete. The results show that the size effect of the flexural strength becomes more obvious as the strength grade increases. The scale effect of the flexural strength of the specimen with a strength grade of R160 is 1.26 times greater than that of the specimen with a strength grade of R120. The content of steel fiber has an effect on the size effect of the flexural strength. The larger the content of steel fiber is, the more pronounced the size effect will be. The flexural strength of specimens with straight fiber and hook fiber and strength grade of R120 at a fiber content 3% (volume fraction) is 71% and 78% greater than that of the specimens without steel fiber reinforcement, respectively. The size conversion factor for the flexural strength of ultra-high performance concrete with different strength grades was given. The calculation formulas for the size effect law of the flexural strength of ultra-high performance concrete were proposed.
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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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