Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Evaluation on Toughness Index of Lightweight Aggregate Concrete with Microsteel Fibers

마이크로 강섬유가 혼입된 경량골재 콘크리트의 인성지수 평가

  • Lee, Hye-Jin (Department of Architectural Engineering, Kyonggi University) ;
  • Kim, Hak-Young (Department of Architectural Engineering, Kyonggi University) ;
  • Yang, Keun-Hyeok (Department of Architectural, Kyonggi University) ;
  • Lee, Young-Ho (Department of Architecture, Tongwon University)
  • Received : 2022.03.13
  • Accepted : 2022.05.24
  • Published : 2022.07.30
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Abstract

This study aimed to estimate the effect of the volumetric fraction(Vf) and shape of microsteel fibers on improving the toughness of lightweight aggregate concrete (LWAC). For LWAC mixes designed at the targeted compressive strength of 40 MPa, Vf of hooked-end steel fibers varied up to 1.0% at an interval of 0.25%, beyond which combination of hooked-end and straight steel fibers were applied up to Vf of 1.5%. The compressive and flexural toughness indices(Ic&T150) determined from the prepared LWAC specimens were assessed with respect to fiber reinforcing index(𝛽f) and compared with those compiled from the previous normal-weight concrete (NWC) reinforced with the conventional steel fibers. microsteel fiber reinforced LWAC specimens exhibited Ic and T150 values similar to those of conventional steel fiber-reinforced NWC when 𝛽f was less than 1.0. Meanwhile, LWAC specimens reinforced with hybrid hooked-end and straight microsteel fibers at 𝛽f exceeding 1.05 exhibited higher Ic and T150 values than conventional steel fiber-reinforced NWC. This implies that the use of hybrid hooked-end and straight microsteel fibers is promising in improving the ductility of LWAC.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 22NANO-C156177-03).

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