Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Compressive Behavior of Hybrid Steel Fiber Reinforced Ultra-High Performance Concrete

하이브리드 강섬유 보강 초고성능 콘크리트의 압축거동

  • Lim, Woo-Young (Institute of Engineering Research, Seoul National University) ;
  • Hong, Sung-Gul (Dept. of Architecture & Architectural Engineering, Seoul National University)
  • Received : 2015.09.01
  • Accepted : 2015.12.09
  • Published : 2016.04.30
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Abstract

Uniaxial compression tests for ultra-high performance hybrid steel fiber reinforced concrete (UHPC) were performed to evaluate the compressive behavior of UHPC. The UHPC for testing contains hybrid steel fibers with a predetermined ratio using a length of 19 mm and 16 mm straight typed steel fibers. Test parameter was determined as a fiber volume ratio to investigate the effect of fiber volume ratio on the strength and secant modulus of elasticity. Test results showed that the compressive strength and elastic modulus of UHPC increased with increasing the fiber volume ratio. Based on the test results, the compressive strength and modulus of elasticity equations were proposed as function of the compressive strength of unreinforced and fiber reinforced UHPC, respectively. The simplified equations for predicting the mechanical properties of the UHPC were a good agreement with the test data. The proposed equations are expected to be applied to the SFRC and UHPC with steel fibers.

이 연구에서는 강섬유 혼입률에 따른 초고성능 강섬유 보강 콘크리트(UHPC)의 압축거동에 관한 연구를 수행하였으며, 실험결과를 바탕으로 강섬유 보강 콘크리트의 압축강도와 탄성계수를 제안하였다. 지름 100 mm, 높이 200 mm의 원주형 공시체에는 0, 0.5, 1.0, 1.5, 그리고 2%의 강섬유가 혼입되었다. 실험에 사용된 UHPC는 굵은골재를 사용하지 않았으며, 16 mm와 19 mm의 강섬유가 일정비율로 혼입된 하이브리드 강섬유가 사용되었다. 실험결과, UHPC의 압축강도와 탄성계수는 강섬유 혼입률에 따라 증가하는 경향을 보였다. 실험결과를 바탕으로 강섬유 보강 콘크리트의 압축강도와 탄성계수가 제안되었다. 강섬유 보강 콘크리트의 압축강도는 무보강 콘크리트의 압축강도의 함수로 제안되었으며, 탄성계수는 강섬유 보강 콘크리트의 압축강도의 함수로 제안하였다. 기존 실험값과 비교한 결과 제안된 압축강도와 탄성계수는 실험값을 비교적 잘 예측하는 것으로 나타났으며, 압축강도가 35~235 MPa인 강섬유 보강 콘크리트에 적용가능 할 것으로 판단된다.

Keywords

References

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