Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Fiber Orientation Impacts on the Flexural Behavior of Steel Fiber Reinforced High Strength Concrete

섬유의 방향성이 강섬유 보강 초고강도 콘크리트의 휨거동 특성에 미치는 영향

  • Kang, Su-Tae (Korea Institute of Construction Technology) ;
  • Kim, Yun-Yong (Dept. of Civil Engineering, Chungnam National University) ;
  • Lee, Bang-Yun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jin-Keun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • 강수태 (한국건설기술연구원 구조연구부) ;
  • 김윤용 (충남대학교 토목공학과) ;
  • 이방연 (한국과학기술원 건설 및 환경공학과) ;
  • 김진근 (한국과학기술원 건설 및 환경공학과)
  • Published : 2008.12.31
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Abstract

To evaluate the fiber orientation characteristics and estimate its effect on the flexural strength of steel fiber reinforced ultra high strength concrete with directions of concrete placing, we developed an image processing technique and carried out the flexural test to quantify the effect of fiber orientation characteristics on the flexural strength as well. The image processing technique developed in this study could evaluate quantitatively the fiber orientation property by the use of dispersion coefficient, the number of fibers in a unit area, and fiber orientation. It was also found that the fiber orientation characteristics were dependent on the direction of concrete placing. Fiber orientation characteristic was revealed to strongly affect the ultimate flexural strength, while hardly affecting the first cracking strength. Theoretical model for flexural strength was applied to compare with test results, which exhibited a good agreement.

이 연구에서는 강섬유 보강 초고강도 콘크리트의 타설방법에 따라 섬유의 방향성이 인장강도에 미치는 영향을 파악하고자 섬유의 방향성을 정량적으로 평가할 수 있는 이미지 프로세싱 기법을 개발하였으며, 개발한 기법을 적용하여 섬유의 방향성을 평가하였다. 또한 휨인장실험을 수행하여 섬유의 방향성이 균열발생강도 및 휨인장강도에 미치는 영향을 파악하였다. 이 연구에서 개발한 이미지 프로세싱 기법은 섬유 방향성 이외에 분산성 계수, 단위면적당 섬유의 개수 등, 분포 특성을 정량적으로 평가하고 있으며, 타설방법에 따라 섬유 분포 특성에 상당한 차이가 있음을 확인할 수 있었다. 그리고 섬유의 방향 분포특성은 강섬유 보강 초고강도 콘크리트의 균열발생강도에는 크게 영향을 미치지 않으나, 휨인장강도에 미치는 영향은 아주 큰 것으로 나타났으며, 이론적인 휨강도 모델식에 실제 섬유 방향성을 적용하여 예측한 결과, 실험 결과와 잘 일치하는 것으로 나타났다.

Keywords

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