It is a well known that concrete is strong for compression and weak for tension. For reinforcing the weakness and improving the performance about concrete, various methods are used. Fiber reinforced concrete that is one of them has been investigated in this study. The function of fiber in concrete is to improve the stress strain relation and toughness, crack control. It’s applied from normal strength concrete to ultra-high performance concrete. But it is essential to disperse fiber uniformly and to prevent aggregation of fiber in concrete, in order that fiber reinforced concrete show the sufficient performance. The various properties of fiber affect the essential properties, for instance, length and diameter of fiber, source, etc. So, this study evaluated the ultra-high performance concrete with mixed in composite fiber.

1. 서 론
  1.1 연구의 배경 및 목적
 2. 실 험
  2.1 실험계획 및 방법
  2.2 사용재료
  2.3 섬유특성
 3. 실험결과
  3.1 슬럼프 플로우
  3.2 압축강도
  3.3 휨강도
 4. 결 론
 REFERENCES

• 김승기(금오공과대학교 건축공학과 박사과정, Ph.D Student, Department of Architecture Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Kim, Seung-Ki
• 최정호(한국섬유개발연구원 책임연구원, Senior Research, Practical Textile Research Team, Korea Textile Development Institute, Daegu, Korea) | Choi, Jeong-Ho
• 서동찬(미성폴리머 팀장, Team Leader, Research & Development Department., MI SUNG POLYMER, Gimhae, Korea) | Seo, Dong-Chan
• 이승한(금오공과대학교 산학협력단 팀장, Team Manager, Industry-academy Cooperation Foundation, Kumoh National Institute of Technology, Gumi, Korea) | Lee, Seung-Han
• 김우석(금오공과대학교 건축학부 교수, Professor, School of Architecture, Kumoh National Institute of Technology, Gumi, Korea) | Kim, Woo-Suk Corresponding author
• 한상묵(금오공과대학교 토목공학과 교수, Professor, Department of Civil Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Han, Sang-Mook