Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Effects of Aggregate Size and Fiber Volume Fraction on Flexural Properties of Steel Fiber Reinforced Concrete (SFRC)

골재크기 및 섬유혼입률에 따른 강섬유 보강 콘크리트의 휨 성능

  • Received : 2014.06.17
  • Accepted : 2015.01.26
  • Published : 2015.02.28
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Abstract

This paper describes the effect of aggregate size and fiber volume fraction on flexural properties of steel fiber reinforced concrete(SFRC) with specified compressive strength of 60 MPa. Maximum aggregate size used was 8 and 20mm, and steel fiber volume fraction was 0, 0.5, 1, 1.5, 2% in volume basis, in this study. Flexural properties studied include first-crack strength, flexural strength and toughness index of hardened SFRC. For this purposes, three prisms ($100{\times}100{\times}400mm$) form each mixture were made and tested under four points bending on the span length 300 mm. Test results indicated that flexural strength and toughness of SFRC were improved with increasing the volume fraction. Especially, specimens with aggregate size of 8mm were reported higher improvement in flexural toughness index than those with 20mm. This phenomenon are remarkable that fiber dispersion is improved with smaller aggregate size. Also the optimum volume fraction of SFRC was presented for that with 1.5% volume fraction. Based on test results and available literatures, flexural strength prediction model was established from compressive strength, volume fraction and aspect ratio of steel fiber. The model existed a good correlation between measured data.

Keywords

Acknowledgement

Supported by : 국토교통과학기술진흥원

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