Concrete using recycled aggregate instead of natural aggregate reduces environmental waste and is a future oriented material. However, use of the structure is limited to negative recognition of recycled aggregate quality. In this study, 50 MPa concrete was developed using recycled aggregate. In order to verify the possibility of using as a column member, we aimed to confirm the compressive behavior of RCFT (Recycled Concrete Filled Tube) columns filled with concrete using recycled aggregate. Circular type steel pipe was used, and concrete strength (30, 40, 50MPa) and mixing ratio were the experimental parameters. Through 72 specimen compression tests, 50MPa strength of recycled aggregate concrete was confirmed and stable behavior of 9 RCFT columns was confirmed.

ABSTRACT
 1. 연구 배경 및 목적
 2. 순환골재 콘크리트 충전강관의 압축내력평가
 3. 순환골재 콘크리트 배합 및 RCFT압축실험
  3.1 순환골재 콘크리트 배합과 50MPa 강도 발현
  3.2 RCFT(Recycled aggregate concrete filledtube) 기둥압축실험
 4. 실험결과
  4.1 순환골재 콘크리트 강도 비교
  4.2 RCFT(Recycled Aggregate Concrete FilledTube) 기둥 내력 분석 및 좌굴형상
 5. 결론
 References

• 최원호(서울시립대학교 건축공학과) | Choi Won-Ho
• 김부규(서한종합건축사사무소) | Kim Bu-Kyu
• 송종욱(목양디자인그룹건축사사무소) | Song Jong-Wook
• 김선희(서울시립대학교 건축학부) | Kim Sun-Hee
• 최성모(서울시립대학교 건축학부) | Choi Sung-Mo