콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제24권1호
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  • Pages.79-86
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  • 2012
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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DOI QR코드

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섬유보강 콘크리트에 묻힌 GFRP 보강근의 부착거동에 대한 섬유영향 평가

Influence Evaluation of Fiber on the Bond Behavior of GFRP Bars Embedded in Fiber Reinforced Concrete

  • 강지은 (성균관대학교 건설환경시스템공학과) ;
  • 김병일 (성균관대학교 건설환경시스템공학과) ;
  • 박지선 (한국건설기술연구원) ;
  • 이정윤 (성균관대학교 건설환경시스템공학과)
  • Kang, Ji-Eun (Dept. of Civil and Environmental System Engineering, Sungkyunkwan University) ;
  • Kim, Byoung-Ill (Dept. of Civil and Environmental System Engineering, Sungkyunkwan University) ;
  • Park, Ji-Sun ()Korea Institute of Construction Technology) ;
  • Lee, Jung-Yoon (Dept. of Civil and Environmental System Engineering, Sungkyunkwan University)
  • 투고 : 2011.11.12
  • 심사 : 2012.01.03
  • 발행 : 2012.02.29
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초록

이 연구에서는 콘크리트에 보강된 섬유의 종류 및 함유량이 FRP 보강근 부착강도에 미치는 효과를 조사하였다. 실험체는 3종류의 보강근과 구조용 강섬유, 절곡형 PP섬유와 친수성 PVA섬유를 사용하여 제작하였으며 직접부착 강도시험을 실시하여 부착강도를 평가하였다. 실험 결과 섬유의 종류 및 함유량에 따라 섬유보강 콘크리트와 보강근 사이의 부착강도에 영향을 미침을 알 수 있었다. 섬유의 가교효과로 인해 할렬균열을 제어함으로써 함유량이 증가함에 따라 부착강도가 증가하였으며, 연성 또한 증가하였다. 부착강도 및 연성증가 효과는 강섬유 > PVA섬유 > PP섬유 순으로 나타났다.

Though steel reinforcing bars are the most widely used tensile reinforcement, corrosion problems are encountered due to the exposure to aggressive environments. As an alternative material to steel, the fiber reinforced polymers have been used as reinforcement in concrete structures. However, bond strength of FRP rebar is relatively low compared to steel rebar. It has been reported that fibers in matrix can resist crack growth, propagation and finally result in an increase of toughness. In this study, high-strength concrete reinforced with structural fibers was produced to enhance interfacial bond behavior between FRP rebar and concrete matrix. The interfacial bond-behaviors were investigated from a direct pullout test. The test variables were surface conditions of GFRP bars and fiber types. Total of 54 pullout specimens with three different types of bars were cast for bond strength tests. The bond strength-slip responses and resistance of the bond failure were evaluated. The test results showed that the bond strength and toughness increased according to the increased fiber volume.

키워드

참고문헌

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