|
Title |
Effects of Steel Fiber Strength and Aspect Ratio on Mechanical Properties of High-Strength Concrete
|
|
Authors |
정권영(Gwon Young Jeong) ; 장석준(Seok Joon Jang) ; 김용철(Yong Cheol Kim) ; 윤현도(Hyun Do Yun) |
|
DOI |
https://doi.org/10.4334/JKCI.2018.30.2.197 |
|
Keywords |
고성능 강섬유 ; 고강도 콘크리트 ; 파괴에너지 ; 휨 성능 ; 노치 보 high-performance steel fiber ; high-strength concrete ; fractural energy ; flexural performance ; notched beam |
|
Abstract |
Steel fiber is mainly used to delay the crack progression and to improve the post-peak behavior of concrete. In high-strength concrete, however, the reinforcing effect of fiber is reduced by the higher fracture energy at the cracking stage. In this study, the effects of tensile strength (ft) and aspect ratio (l/d) of steel fiber on the compressive and flexural performance of high strength concrete were investigated. For this purpose, six different steel fiber reinforced concrete (SFRC) mixtures were designed and mixed with specified compressive strength of 80 MPa. Three types of hooked-end steel fibers with different l/d and ft were added into high strength concrete at fiber volume fractions (Vf) of 0.5 and 1.0 %. From the compressive test results of high strength SFRC, it was found that the addition of steel fibers does not significantly affect the compressive strength of high strength concrete with a lower Vf of 0.5 %. However, the inclusion of 1.0 % steel fibers slightly enhances the compressive strength of high strength concrete. The results of flexural tests indicated that the increase in the volume fraction and aspect ratio and tensile strength of steel fiber improve the flexural performance of high strength concrete. The addition of hooked-end steel fiber with higher tensile strength and aspect ratio can improve the flexural performance, such as flexural strength and toughness, of high strength concrete without sacrificing the workability due to the increasing fiber volume fraction.
|