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Title |
Effect of Hooked-end Steel Fiber Volume Fraction and Aspect Ratio on Flexural and Compressive Properties of Concrete
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Authors |
김동휘(Dong-Hui Kim) ; 장석준(Seok-Joon Jang) ; 김선우(Sun-Woo Kim) ; 박완신(Wan-Shin Park) ; 윤현도(Hyun-Do Yun) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.3.40 |
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Keywords |
강섬유보강 콘크리트; 후크형 강섬유; 형상비; 체적비; 휨; 압축 Steel fiber reinforced concrete (SFRC); hooked-end steel fiber; aspect ratio; volume fraction; flexure; compression |
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Abstract |
This study investigates the influence of hooked-end steel fiber volume fraction and aspect ratio on the mechanical properties, such as compressive and flexural performance, of concrete with specified compressive strength of 30MPa. Three types of hooked-end steel fibers with aspect ratios of 64, 67 and 80 were selected. The flexural tests of steel fiber reinforced concrete (SFRC) prismatic specimens were conducted according to EN 14651. The compressive performance of SFRC with different volume fractions (0.25, 0.50 and 0.75%) were evaluated through standard compressive strength test method (KS F 2405). Experimental results indicated that the flexural strength, flexural toughness, fracture energy of concrete were improved as steel fiber volume fraction increases but there is no unique relationship between steel fiber volume fraction and compressive performance. The flexural and compressive properties of concrete incorporating hooked-end steel fiber with aspect ratio of 64 and 80 are a little better than those of SFRC with aspect ratio of 67. For each SFRC mixture used in the study, the residual flexural tensile strength ratio defined in Model Code 2010 was more than the limit value to be able to substitute rebar or welded mesh in structural members with the fiber reinforcement.
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