Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Structural Performance Evaluation of Steel Fiber-Reinforced Concrete Beams with Recycled Coarse Aggregates

순환골재를 사용한 강섬유보강 콘크리트보의 구조 성능 평가

  • Shin, Jae-Lin (Dept. of Architectural Engineering, Kumoh National Institute of Technology) ;
  • Kim, Woo-Suk (Dept. of Architectural Engineering, Kumoh National Institute of Technology) ;
  • Baek, Seung-Min (Dept. of Architectural Engineering, Kumoh National Institute of Technology) ;
  • Kang, Thomas H.-K. (Dept. of Architecture and Architectural Engineering, Seoul National University) ;
  • Kwak, Yoon-Keun (Dept. of Architectural Engineering, Kumoh National Institute of Technology)
  • Received : 2014.07.21
  • Accepted : 2015.03.25
  • Published : 2015.06.30
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Abstract

In this study, twenty four steel-fiber reinforced concrete (SFRC) beams using recycled coarse aggregates (RCA) were manufactured to examine the shear behavior of SFRC and to determine the beams' ultimate shear strengths. The RCA replacement ratio was fixed at 30%. The variables studied in this investigation are: (1) shear span-to-depth ratios (a/d) of 2, 3 and 4; (2) longitudinal reinforcement ratio (${\rho}$) of 0.008 and 0.0127; and (3) steel fiber volume fractions ($V_f$) of 0, 0.5, 0.75 and 1%. Test results were analyzed and then compared with the findings and proposals of various other researchers. Based on the test results, the more steel fiber volume fraction is increased, the large crack resistance and shear strength are exhibited. Most of the experimental data is higher than the theoretical value. Therefore, steel-fiber reinforced concrete beams using recycled coarse aggregates are suggested to be applied for building structures.

본 연구에서는 순환골재를 사용한 강섬유보강 콘크리트보의 전단거동을 알아보기 위하여 순환골재 치환율은 30 %로 고정하고, 전단경간비(a/d = 2, 3, 4), 인장철근비(${\rho}=0.8$, 1.27 %) 및 강섬유 혼입율($V_f=0$, 0.5, 0.75, 1%)을 변수로 한 총 24개의 강섬유보강 콘크리트보를 만들어 실험하였다. 또한 순환골재를 사용한 강섬유보강 콘크리트보의 전단강도를 여러 연구자들의 제안식과 비교 분석하였다. 즉, 순환골재를 사용한 강섬유보강 콘크리트보의 전단거동에 따른 전단내력을 분석하고, 강섬유보강 전단강도 제안식과 실험값을 비교하여 순환골재를 사용한 강섬유보강 콘크리트보의 사용가능성을 평가하고자 하였다. 대부분의 실험값이 제안식에 의한 이론값보다 높게 나타나 순환골재를 사용한 강섬유보강 콘크리트보를 구조부재로 사용하여도 무방하다고 판단된다.

Keywords

References

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  2. A Study on the Mechanical Properties of Para-aramid Fiber-Reinforced Concrete using Environment-Friendly Recycled Coarse Aggregates vol.9, pp.1, 2018, https://doi.org/10.11004/kosacs.2018.9.1.062