Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Flexural performance evaluation of SFRC with design strength of 60 MPa

TBM 터널 세그먼트용 60 MPa급 강섬유보강콘크리트의 휨성능 평가

  • Moon, Do-Young (Department of Civil Engineering, Kyungsung Univ.) ;
  • Kang, Tae-Sung (SAMPYO Construction & Engineering co. Ltd., R&D Department) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Gyu-Phil (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Bae, Gyu-Jin (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
  • 문도영 (경성대학교 토목공학과) ;
  • 강태성 (삼표건설, 연구개발팀) ;
  • 장수호 (한국건설기술연구원 Geo-인프라연구실) ;
  • 이규필 (한국건설기술연구원 Geo-인프라연구실) ;
  • 배규진 (한국건설기술연구원 Geo-인프라연구실)
  • Received : 2013.04.03
  • Accepted : 2013.05.10
  • Published : 2013.05.31
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Abstract

Based on Model Code 2010, flexural and residual strength, flexural toughness of SFRC with design strength of 60 MPa are evaluated. For comparisons, SFRC with design strength 40 MPa was tested. Distribution of steel fibers in crack surface of specimens was evaluated by visual inspection. The used steel fibers were hooked fibers with aspect ratio of 64, 67 and 80. In all specimens, mix ratio of steel fibers was 0.5% Vol. In results, only SFRC with the highest aspect ratio satisfied requirements specified in Model Code 2010. The results demonstrated that the use of high aspect ratio will provide enough flexural toughness for high strength concrete. Also, it is found that low slump of high strength concrete can help to enhance isotropic fiber distribution.

본 연구에서는 Model Code 2010에 제시된 실험방법에 근거하여 설계강도 60MPa의 강섬유보강 콘크리트의 휨강도와 잔존강도, 휨인성을 평가하였다. 비교를 위하여 설계강도 40MP의 강섬유보강 콘크리트도 실험하였다. 또한, 배합의 평가를 위하여 파괴된 시험체의 파괴면을 육안으로 관찰하여 강섬유의 분산도를 평가하였다. 본 실험에서 사용된 강섬유는 형상비 64, 67 및 80의 국내산 후크 강섬유이다. 강섬유 혼입률은 체적에 대하여 0.5%로 동일하다. 실험결과, 설계강도 60MPa에서는 형상비가 큰 강섬유가 혼입된 강섬유보강 콘크리트만이 Model Code 2010에서 제시된 요구성능을 만족하는 것으로 나타났다. 고강도 콘크리트에서는 큰 형상비의 강섬유가 심대한 균열에서 충분한 인성을 확보하는데 기여할 수 있는 것으로 판단된다. 또한, 섬유의 고른 분산도 확보를 위해서는 낮은 슬럼프가 유리한 것으로 나타났다.

Keywords

References

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