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http://dx.doi.org/10.5659/JAIK.2022.38.7.255

Evaluation on Toughness Index of Lightweight Aggregate Concrete with Microsteel Fibers  

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)
Publication Information
Journal of the Architectural Institute of Korea / v.38, no.7, 2022 , pp. 255-262 More about this Journal
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
microsteel fiber; lightweight aggregate concrete; compressive toughness; flexural toughness;
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Times Cited By KSCI : 1  (Citation Analysis)
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