| Autor: |
Bagher Shemirani, Alireza |
| Zdroj: |
Iranian Journal of Science and Technology. Transactions of Civil Engineering; June 2022, Vol. 46 Issue: 3 p2161-2172, 12p |
| Abstrakt: |
Numerous fibers combinations are used in the construction industry for improving the fracture resistance of hybrid fiber-reinforced concrete (HyFRC). In this paper, the effects of fiber combination on the mechanical properties of FRC are studied. For this purpose, different volume percentages of the added fibers with different compositions are used to investigate their influences on the fracture toughness and tensile strength of the concrete. Different fiber compositions including the steel, carbon and polypropylene of different volume ratios can be added to the concrete specimens for measuring their tensile strength and critical stress intensity factor of the samples containing preexisting cracks. Therefore, some concrete specimens are prepared by adding 1% carbon fibers and different ratios of steel and polypropylene fibers. The direct tensile testing machine and the indirect Brazilian tensile test apparatus are used to measure the tensile strength of the HyFRC specimens in the laboratory. Some specimens are also used to measure the fracture toughness (Mode I) of the HyFRC by using the novel compression-to-tensile load converting device implemented in the universal tensile testing machine. The novelty of this paper is to render a new approach for the measurement of tensile strength and fracture toughness of hybridized fiber-reinforced concrete (HyFRC) by adding different kinds of fibers. These experimental results show that by changing the ratios of the carbon, steel and polyethylene fibers the tensile strength and fracture toughness of HyFRC specimens change accordingly. |
| Databáze: |
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