Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Evaluation of flexural performance of high performance fiber reinforced cementitious composites according to fiber shape, aspect ratio and volume fraction

강섬유의 형상, 길이 및 혼입율에 따른 고성능 섬유보강 시멘트 복합체의 휨 특성 평가

  • Park, Gi-Joon (Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Jung-Jun (Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Sung-Wook (Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jang-Hwa (Korea Institute of Civil Engineering and Building Technology)
  • 박기준 (한국건설기술연구원 구조융합연구소) ;
  • 박정준 (한국건설기술연구원 구조융합연구소) ;
  • 김성욱 (한국건설기술연구원 구조융합연구소) ;
  • 이장화 (한국건설기술연구원 구조융합연구소)
  • Received : 2017.11.02
  • Accepted : 2017.12.08
  • Published : 2017.12.31
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Abstract

High-Performance Fiber-Reinforced Cement Composites (HPFRCC) has outstanding durability, and has attracted interest because of its ductility and development of strength, which allows a reduction of the self-weight of a structural member by substantially decreasing the cross section. Therefore, the present study aimed to improve the economic efficiency of HPFRCC by examining experimentally the flexural performance considering various characteristics of the steel fiber. To find an efficient fiber reinforcement method, the flexural performance was evaluated for different shapes, aspect ratios, and volume ratios of the steel fiber. Straight, hooked, and twisted fiber configurations were considered by adopting a fiber length longer than the usual 13 mm. The test results showed that HPFRCC reinforced by 19.5 nun-long straight fibers with a volume fraction of 1.5% shows better flexural performance than that reinforced by 13 mm-long straight fibers with a volume fraction of 2.0%. Consequently, HPFRCC with enhanced economic efficiency can be produced by adopting a reduced amount of steel fiber.

고성능 섬유보강 시멘트 복합체(High-Performance Fiber-Reinforced Cement Composites, HPFRCC)는 내구성 및 연성이 우수할 뿐만 아니라, 강도발현이 뛰어나 구조부재 적용 시 단면을 상당히 감소시켜 자중을 줄일 수 있는 재료로 관심을 받고 있다. 이에 본 연구에서는 HPFRCC에 사용 가능한 다양한 강섬유 종류 및 강섬유의 특성에 따라 휨 실험을 수행하였으며, 휨 성능 분석을 통해 효율적인 섬유보강 방법을 모색하여 경제성을 향상시키고자 하였다. 따라서 보다 효율적인 섬유보강 방법을 찾기 위해 기존길이 13 mm 보다 긴 강섬유를 소성 변형시킨 갈고리형 강섬유, 비틀림 강섬유를 사용하여 섬유의 모양(shape), 형상비(aspect ratio) 혼입율에 대한 휨 특성을 평가하고 분석하고자 하였다. 실험결과 HPFRCC에 일자형태를 가지는 길이 19.5 mm의 강섬유를 1.5%만큼 혼입할 경우 기존에 많이 사용되고 있는 길이 13 mm의 일자형 강섬유를 2.0% 혼입하였을 때 보다 뛰어난 휨 성능을 나타내었다. 따라서 섬유량을 줄여줄 수 있기 때문에 보다 경제성이 우수한 강섬유 보강 HPFRCC를 제조할 수 있을 것으로 판단되었다.

Keywords

Acknowledgement

Supported by : 국토교통과학기술진흥원

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