Recently, redevelopment and reconstruction projects have caused problems such as depletion of natural aggregates, and the use of recycled aggregate is being reevaluated as an optimal alternative. Therefore, in this study, the mechanical and deformation characteristics of Environment-Friendly Recycled Coarse Aggregate (here after, EFRCA) concrete reinforced with para-aramid fiber with high strength and high elasticity are examined. The experimental main parameters were EFRCA replacement ratio (0, 30 and 50%) and para-aramid fiber volume fraction (0, 0.75 and 1.0%). Experimental results show that the EFRCA concrete has lower compressive strength than plain concrete. However, compared with the natural aggregate, the EFRCA concrete, which exhibited low material properties, showed almost the same performance as plain concrete, such as increased flexural strength and improved ductility by incorporating para-aramid fibers. Through the experiment, it is considered that the most suitable para-aramid volume fraction is 0.75%. Based on these results, the experimental results related to the performance degradation of EFRCA concrete containing para-aramid fibers are secured and basic data for determining the reuse possibility and reinforcement method of structures are presented.

1. 서 론
 2. 기존 실험연구 고찰
  2.1 순환굵은골재 치환율에 따른 콘크리트의 강도특성
  2.2 순환굵은골재 콘크리트에 대한 섬유보강 효과
 3. 실 험
  3.1 실험계획
  3.2 사용재료 및 재료특성
  3.3 배합설계
  3.4 실험방법
 4. 실험결과 및 분석
  4.1 공시체 파괴형
  4.2 압축강도
  4.3 쪼갬인장강도
  4.4 휨강도
 5. 결 론
 REFERENCES

• 이헌석(금오공과대학교 건축공학과 박사과정, Ph.D Student, Department of Architecture Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Lee, Heon-Seok
• 김승기(금오공과대학교 건축공학과 박사과정, Ph.D Student, Department of Architecture Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Kim, Seung-Ki
• 이형주(금오공과대학교 건축공학과 박사과정, Ph.D Student, Department of Architecture Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Lee, Hyung-Joo
• 아지모프 엘리욧(금오공과대학교 건축공학과 석사과정, Master Student, Department of Architecture Engineering, Kumoh National Institute of Technology, Gumi, Korea) | Azimov, Elyorjon
• 김우석(금오공과대학교 건축학부 조교수, Professor, School of Architecture, Kumoh National Institute of Technology, Gumi, Korea) | Kim, Woo-Suk Corresponding author