Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Bond Properties of CFRP Rebar in Fiber Reinforced High Strength Concrete with Surface Treatment Methods of Reinforcing Fibers

보강섬유의 표면처리에 따른 섬유보강 고강도콘크리트와 CFRP 보강근의 부착특성

  • Park, Chan-Gi (Dept. of Rural Construction Engineering, Kongju National University) ;
  • Won, Jong-Pil (Dept. of Civil and Environmental System Engineering, Konkuk University) ;
  • Cha, Sang-Sun (Dept. of Rural Construction Engineering, Kongju National University)
  • 박찬기 (공주대학교 지역건설공학) ;
  • 원종필 (건국대학교 사회환경시스템공학과) ;
  • 차상선 (공주대학교 지역건설공학)
  • Published : 2009.06.30
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Abstract

The effects of surface treatment method of reinforcing fiber on the bonding strength between carbon fiber reinforced polymer rebar (CFRP rebar) and high strength concrete have been evaluated in this study. The structural PVA fiber is coated with a proprietary hydrophobicoiling agent and crimped type polyolefin based structural synthetic fiber is deformed with a geometrical modification were used for the reinforcing fiber. The compressive tests have been performed to evaluate the strength property of high strength concrete depending on the surface treatment method of fiber. The bonding property between the high strength concrete and the CFRP rebar was evaluated by means of direct bonding test. The test results indicated that the surface treatment method of fiber effect on the bonding behavior of high strength concrete and CFRP rebar. Also, as the development and propagation of splitting cracks were controled by adding fibers into the high strength concrete, the bonding behavior, bond strength and relative bonding strength of CFRP rebar and high strength concrete were significantly improved.

본 연구에서는 CFRP 보강근과 고강도콘크리트의 부착강도에 미치는 보강섬유의 표면처리 방법의 효과를 평가하였다. 표면을 친수성 물질로 코팅된 구조용 PVA 섬유 및 기하학적 변형으로 변형된 절곡형 폴리올레핀계 구조용 합성섬유를 보강섬유로 사용하였다. 섬유의 표면처리 방법에 따른 고강도콘크리트의 강도특성을 평가하기 위하여 압축강도 실험을 실시하였다. 고강도콘크리트와 CFRP 보강근 사이의 부착특성은 직접 부착강도시험을 의하여 평가하였다. 시험 결과는 섬유의 표면처리 방법은 고강도콘크리트와 CFRP 보강근 사이의 부착거동에 영향을 미쳤다. 또한 고강도콘크리트에 섬유의 첨가는 할렬균열의 발생 및 성장을 조절함으로써 고강도콘크리트와 CFRP 보강근 사이의 부착거동, 부착강도 및 상대부착강도의 증가시켰다.

Keywords

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