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Title |
Shear Performance on SFRC Beam Using Recycled Coarse Aggregate
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Authors |
김성은(Seongeun Kim) ; 정재원(Jaewon Jeong) ; 김승훈(Seunghun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.189 |
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Keywords |
강섬유 ; 순환골재 ; 전단강도 ; 강섬유보강 콘크리트 Steel fiber ; Recycled coarse aggregate ; Shear strength ; SFRC |
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Abstract |
Degraded shear performance of reinforced concrete members with recycled coarse aggregate (RCA) compared to flexural strength is a problem. To address this, steel fibers can be used as concrete reinforcement material. In this study, the strength and deformation characteristics of SFRC beams using RCA were to be determined by shear tests. Major experimental variables include the volume fraction of steel fiber (0, 0.5%, 1%), the replacement rate of RCA (0%, 100%), and the shear span ratio (a/d = 1, 2). As a result of the experiment, the shear strength of the specimen increased as the rate of mixing steel fiber increased. For specimens with RCA and 1% steel fiber, the maximum shear strengths increased by 1.77 - 6.25% compared to specimens with normal coarse aggregate (NCA). On the other hand, at 0-0.5% steel fiber, the shear strengths of RCA specimens were reduced by 24.2% to 49.2% compared to NCA specimens. This indicates that reinforcement with 1% volume fraction of steel fiber greatly contributes to preventing shear strength reduction due to the use of RCA.
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