Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Bond Characteristics of Ultra High Performance Concrete

초고성능 콘크리트(UHPC)의 부착특성에 관한 연구

  • Kook, Kyung-Hun (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Shin, Hyun-Oh (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kwahk, Im-Jong (Korea Institute of Construction Technology) ;
  • Yoon, Young-Soo (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 국경훈 (고려대학교 건축사회환경공학부) ;
  • 신현오 (고려대학교 건축사회환경공학부) ;
  • 곽임종 (한국건설기술연구원) ;
  • 윤영수 (고려대학교 건축사회환경공학부)
  • Received : 2010.05.11
  • Accepted : 2010.08.20
  • Published : 2010.12.31
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Abstract

Ultra high performance concrete (UHPC), is characterized by its high compressive strength and advanced tensile behavior that is much superior to those of conventional concrete. In order to apply this new material in practice, the bond characteristics of UHPC were evaluated in this study. Pull-out tests between UHPC and deformed steel rebar were carried out according to the modified RILEM test method, and were verified by finite element analysis. From the test results showed that UHPC presents 5 to 10 times higher bond strength compared to normal strength concrete, this study suggested remarkably reduced development length and concrete cover comparing to existing specifications. The test results of 700 MPa high strength steel rebar demonstrated the applicability of high strength steel to UHPC. In addition, the transfer length measurements of seven-wire strand in UHPC specimens indicated that the transfer length limit set by the current design code is very conservative for UHPC.

초고성능 콘크리트(ultra high performance concrete, UHPC)는 종래의 보통 콘크리트와 다른 새로운 재료로써 높은 강도와 향상된 인성을 그 특징으로 한다. 이러한 새로운 재료의 활용을 위하여 이 연구에서 초고성능 콘크리트의 부착 성능을 평가하고자 하였다. 수정된 RILEM 방법을 사용하여 초고성능 콘크리트와 이형 철근의 인발실험(pull-out test)을 수행하였으며 보통 콘크리트와 비교하여 5~10배에 달하는 부착강도를 확인하여 기존의 설계 기준에 비하여 현저하게 감소한 정착길이와 피복 두께를 제안하였다. 700 MPa급 고장력 철근의 실험 결과의 비교로부터 초고성능 콘크리트에서 고강도 철근 활용의 유효성을 확인하였다. 강연선의 응력전달길이 측정실험을 통하여 현재 전달길이 기준이 UHPC의 경우 매우 보수적이라는 것을 확인하였다. 또한 유한요소해석을 통하여 실험 결과를 검증하였다.

Keywords

References

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  2. Flexural Bond Behavior of Rebar in Ultra-High Performance Concrete Beams Considering Lap-Splice Length and Cover Depth vol.08, pp.03, 2016, https://doi.org/10.4236/eng.2016.83013
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