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Title |
Effets of Steel Fiber Contents on Flexural Creep Behavior of High-Strength Concrete
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Authors |
임성훈(Seong-Hoon Lim) ; 김동휘(Dong-Hwi Kim) ; 윤현도(Hyun-Do Yun) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.2.111 |
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Keywords |
휨 크리프; 후크형 강섬유; 4점 가력; 고강도 콘크리트; 균열개구 flexural creep; hooked-end steel fiber; four-point bending test; high-strength concrete; crack opening |
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Abstract |
In this paper, the flexural creep behavior of hooked-end steel fiber reinforced high-strength concrete was evaluated to investigate the steel fiber content influence on long-term behavior of flexural members. An experimental program consisted of nine prismatic beam specimens with dimensions of 150 × 150 × 600mm reinforced with different contents of steel fiber (0, 0.75 and 1.5% at the volume fraction). To introduce flexural creep loading to notched prismatic beam specimens, a four-point bending test setup was used. The sustained load with 40% of the flexural strength was applied by means of a lever system and controlled by a load cell for 90 days. During sustained loading, crack mouth opening displacement (CMOD) was monitored. Conventional flexural test after creep tests were carried out to evaluate the residual capacity of each specimen. Test results showed that steel fiber content has a significant effect on the flexural creep behavior of high-strength concrete and long-term flexural load with 40% of flexural strength doesn’t generate negative effects on the residual capacity of steel fiber reinforced high-strength concrete.
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