Recycled aggregate is a solution to reduce construction waste and to be environmentally friendly, but concrete using it has various disadvantages in terms of structure. Therefore, the interaction effect of the two materials can be expected by filling the cyclic aggregate concrete in the CFT column. Eighteen specimens were constructed to confirm the compressive behavior of RCFT (Recylced Concrete Filled Tube) columns, which can be applied to real buildings by making high strength concrete with recycled aggregate. Variable is the shape and thickness of steel pipe, concrete strength and mixing ratio, and coarse aggregate and fine aggregate are all used as recycled aggregate. A total of three recycled aggregate concrete preformulations were used to find the optimal mixing ratio and the compressive behavior was analyzed through the load - displacement curves of RCFT columns.

Abstract
 1. 서 론
  1.1 연구 배경 및 목적
  1.2 연구 내용 및 범위
 2. 선행 연구
  2.1 순환골재 콘크리트의 구조부재 적용
  2.2 순환골재 콘크리트의 강관충전 사용
 3. 순환골재 CFT기둥의 내력식
  3.1 KBC(Korea Building Code) 2016
  3.2 AISC (American Institute of SteelConstruction) 360-10
 4. 충전강관용 순환골재콘크리트 배합비 추출
  4.1 실험 계획
  4.2 순환골재 콘크리트의 강도와 유동성 확보
  4.3 실험 결과
 5. 순환골재 콘크리트충전강관 강관 기둥실험
  5.1 실험계획
  5.2 강재 재료시험결과
  5.3 순환골재 콘크리트 충전 강관기둥 기둥 압축실험 방법
  5.4 실험결과
 6. 분석 및 고찰
  6.1 충전강관용 50MPa 순환골재콘크리트 확보
  6.2 Compact단면을 가진 순환골재 콘크리트충전강관기둥의 압축내력 분석
  6.3 현행 설계식과 내력검토
 7. 결 론
 REFERENCES

• 최원호(서울시립대학교 건축공학과 석사과정) | Won-Ho Choi (Graduate Student, Department of Architectural Engineering, Unversity Of Seoul)
• 이재현(서울시립대학교 건축공학과 석사과정) | Jae-Hyun Lee (Graduate Student, Department of Architectural Engineering, Unversity Of Seoul)
• 박용필(아원구조엔지니어링 소장) | Yong-Pil Park (Progect Manager, Awon Structural Engineering)
• 김선희(서울시립대학교 건축학부 연구교수) | Sun-Hee Kim (PhD., Department of Architectural Engineering, Unversity Of Seoul)
• 최성모(서울시립대학교 건축학부 교수) | Sung-Mo Choi (Professor, Department of Architectural Engineering, Unversity Of Seoul) Corresponding author