| Title |
Evaluation on Toughness Index of Lightweight Aggregate Concrete with Microsteel Fibers |
| Authors |
이혜진(Lee, Hye-Jin) ; 김학영(Kim, Hak-Young) ; 양근혁(Yang, Keun-Hyeok) ; 이영호(Lee, Young-Ho) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.7.255 |
| Keywords |
마이크로 강섬유; 경량골재 콘크리트; 압축 인성; 휨 인성 |
| Abstract |
This study aimed to estimate the effect of the volumetric fraction( ? ) 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, ? 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 ?
of 1.5%. The compressive and flexural toughness indices( ?& ) determined from the prepared LWAC specimens were assessed with respect
to fiber reinforcing index(? ) and compared with those compiled from the previous normal-weight concrete (NWC) reinforced with the
conventional steel fibers. microsteel fiber reinforced LWAC specimens exhibited ? and values similar to those of conventional steel
fiber-reinforced NWC when ? was less than 1.0. Meanwhile, LWAC specimens reinforced with hybrid hooked-end and straight microsteel
fibers at ? exceeding 1.05 exhibited higher ? and 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. |