Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation on the Impact Resistant Performance of Fiber Reinforced Concrete by High-Velocity Projectile and Contacted Explosion

고속비상체 충돌 및 접촉폭발에 의한 섬유보강 콘크리트의 내충격 성능 평가

  • Nam, Jeong-Soo (Dept. of Architectural Engineering, Chungnam National University) ;
  • Kim, Hong-Seop (Dept. of Architectural Engineering, Chungnam National University) ;
  • Lee, In-Cheol (Dept. of Architectural Engineering, Chungnam National University) ;
  • Miyauchi, Hiroyuki (Dept. of Architectural Engineering, Chungnam National University) ;
  • Kim, Gyu-Yong (Dept. of Architectural Engineering, Chungnam National University)
  • Received : 2012.10.09
  • Accepted : 2013.01.02
  • Published : 2013.02.28
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Abstract

In this study we experimentally evaluated an impact resistant performance of fiber reinforced concrete in the moment of explosion by high-velocity projectile with emulsion explosive. To assess the impact resistance, we conducted the impact test of high-velocity projectile which reaches an impact speed of 350 m/s and the experiment of contact exploding emulsion explosive. As a result, bending and tensile performance depending on type of PVA, PE fiber (polyvinyl alcohol fiber, polyethylene fiber) and steel fiber affects destruction of rear side in the form of spalling. Destroying the backside of the concrete compressive strength compared to suppress the bending and tensile performance is affected. In addition, the experiment shows that the destruction patterns of concrete specimen producted by high velocity impact and contact explosion are significantly similar. Therefore, it is possible to predict the destruction patterns of specimens in the situation of contact explosion by high-velocity projectile.

이 연구는 고속비상체의 충돌 및 에멀젼 폭약에 의한 폭발조건에서 섬유보강 콘크리트의 내충격 성능을 실험적으로 평가하는 것으로 목적으로 하였으며, 고속 충격시험은 비상체의 충돌속도는 약 350 m/s이며, 폭발실험은 시험체 표면에 폭약을 접촉시킨 상태에서 실시하였다. 그 결과, PVA, PE 및 강섬유의 혼입에 의한 섬유보강 콘크리트 시험체의 휨인장성능 증가는 고속충격 및 접촉폭발에 의한 배면파괴를 억제시켰다. 콘크리트의 내충격 성능에 있어서 배면파괴 억제는 압축강도에 비하여 휨인장성능의 영향을 크게 받는 것으로 나타났다. 또한, 고속충돌 및 접촉폭발에 의해 발생하는 콘크리트 시험체의 파괴패턴은 매우 유사한 것을 알 수 있었으며, 고속비상체에 의한 충돌실험을 통해 접촉폭발상황에 대한 시험체의 파괴패턴의 유추가 가능할 것으로 판단된다.

Keywords

References

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