International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Evaluation of Mechanical Properties and Fiber Dispersing Characteristics of Fiber Reinforced Lean Concrete Using Fly Ash and Reject Ash

도로 기층 재료로 활용하기 위한 섬유보강 빈배합 콘크리트에 플라이애시와 리젝트애시를 사용한 경우 역학적 특성 및 섬유 분산성 분석

  • 장영재 (강원대학교 토목건설공학과) ;
  • 박철우 (강원대학교 토목공학과) ;
  • 박영환 (한국건설기술연구원 인프라구조연구실) ;
  • 유평준 (한국건설기술연구원 도로연구실) ;
  • 정우태 (한국건설기술연구원 인프라구조연구실) ;
  • 김용재 (한양대학교 건설환경공학부)
  • Received : 2012.03.20
  • Accepted : 2012.11.12
  • Published : 2013.02.15
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Abstract

PURPOSES: As pavement generally provides service shorter than an expected life cycle, maintenance cost increases gradually. In order to help extending the service life and reduce maintenance cost, a new multi-functional composite pavement system is being developed in Korea. METHODS: This study is a part to develop the multi-functional composite pavement and is to investigate the mechanical performances of fiber-reinforced lean concrete for pavement subbase. The inherent problem of fiber reinforced concrete is dispersion of fibers in concrete mix. This study additionally evaluated fiber dispersion characteristics with respect to different fiber types. RESULTS: From the test results, the compressive strengths of the concretes satisfied the required limit of 5MPa at 7days. The standard deviation of the measured number of fibers were lower in the order of nylon, steel fiber and polypropylene. CONCLUSIONS: Reject ash was shown to be satisfactory as a replacement material to Portland cement in lean concrete base. The fiber volume fraction is suggested to be 0.4% even though the fracture toughness did not vary significantly with respect to fiber types. However, fracture energy absorbed up to complete failure increased with the increased fiber volume fraction increment.

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References

  1. Kang, S. T., Park, J. J., Ryu, G. S., Koh, K. T., Kim, S. W., Lee, J. H., 2007, The Orientation and Dispersion of Steel Fiber in UHPC(Ultra High Performance Concrete), Proc. of Korea Concrete Institute, Vol.19, No.2, pp.749-752.
  2. Korea Institute of Construction Technology, 2009, Development of FRC Composite Pavement, Research Reports, KICT 2009-096,
  3. Sin, N. R., Jang, Y. J., Park, C. W., Kim, G. H., 2011, Strength Development of Roller Compacted Concrete with Respect to Compaction Levels, Proc. of Korea Concrete Institute, Vol.13, No.2, pp.61-62.
  4. Lee, C. H., Kim, Y. K., Kang, J. G., Park, C. W., Lee, S. W., 2011, A study on Construction Methods of Roller Compacted Concrete Pavement for Bike Roads, Journal of Korean Society of Road Engineers, Vol.13, No.2, pp.103-114.
  5. Jang, Y. J., Park, C. W., Park, Y. H., Jung, W. T., Choi, S. Y., Sin, N. R., 2011, Fracture Toughness Comparison of Fiber Reinforced Lean Concrete Incorporating Fly Ash or Reject Ash, Proc. of Korea Concrete Institute, Vol.23, No.2, pp.145-146.
  6. Choi, W. H., Park, C. W., Park, J. S., Jung W. T., Kim, S. W., Park, Y. H., 2011, Investigation of Flexural Toughness of Fiber Reinforced Lean Concrete for Road Subbase Material, Proc. of Korea Concrete Institute, Vol.23, No.1, pp.385-386.
  7. Choi, W. H., Park, C. W., Park, J. S., Jung, W. T., Jang, Y. J., 2011, Strength Development of Fiber Reinforced Lean Concrete for Subbase Material, Proc. of Korean Society of Road Engineers, pp.153-158.
  8. KOREA EXPRESSWAY CORPORATION, 2009, Highway construction provisions.