Flexural performance evaluation of SFRC with design strength of 60 MPa

Do-Young Moon; Tae-Sung Kang; Soo-Ho Chang; Gyu-Phil* Lee; Gyu-Jin Bae

doi:10.9711/KTAJ.2013.15.3.175

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2013 Vol.15, Issue 3 Next Page

Flexural performance evaluation of SFRC with design strength of 60 MPa TBM 터널 세그먼트용 60 MPa급 강섬유보강콘크리트의 휨성능 평가

31 May 2013. pp. 175-186

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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.

Keywords

Flexural Strength

SFRC

Fiber Distribution

High Strength

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.

키워드

휨강도

강섬유 보강콘크리트

섬유분산

고강도

References

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 15
No :3
Pages :175-186
Received Date : 2013-04-03
Revised Date : 2013-04-26
Accepted Date : 2013-05-10
DOI :https://doi.org/10.9711/KTAJ.2013.15.3.175

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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