Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Study on the Characteristics of Recycled Aggregate Concrete According to the Mixing Ratio of Recycled Fine Aggregate at Specific Concrete Strengths

설계기준강도별 순환 잔골재 혼합비율에 따른 순환골재 콘크리트 특성에 관한 연구

  • Sang-Hyuck, Yoon (Korea Institute of Civil engineering and Building Technology) ;
  • Sea-Hyun, Lee (Korea Institute of Civil engineering and Building Technology)
  • 윤상혁 (한국건설기술연구원 건축연구본부) ;
  • 이세현 (한국건설기술연구원 건축연구본부)
  • Received : 2022.10.04
  • Accepted : 2022.11.28
  • Published : 2022.12.30
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Abstract

In this study, the characteristics of recycled aggregate concrete according to the mixing ratio of recycled fine aggregate were analyzed by design strength to explore its use in the production of ready-mixed concrete. The results show that, depending on the ratio of recycled aggregate, the compressive strength is similar to that of normal concrete and does not deteriorate. Therefore, it is possible to achieve a strength similar to the target design strength. Furthermore, if the ratio of recycled fine aggregate for concrete is up to 25 % of the total aggregate amount (50 % of the to-tal fine aggregate), slump does not cause problems. Our findings show that the higher the de-sign standard strength, the greater the amount of powder, and management of slump reduction, unit quantity, and performance system is necessary. The obtained results show that recycled ag-gregate can be used for the production of ready-mixed concrete after adjusting its mixing ratio and concrete mix proportions.

순환 잔골재 혼합비율에 따른 압축강도는 설계기준강도별 보통콘크리트 대비 순환 잔골재 혼합비율에 따라 유사하거나 다소 낮은 강도 발현을 보였으며, 순환 잔골재 혼합비율이 증가할수록 압축강도는 감소하는 경향을 보였다. 재령일이 증가할수록 강도저하는 발생하지 않았으며, 설계기준강도 대비 강도 발현이 가능할 것으로 판단된다. 순환 잔골재 15 %, 20 %, 25 %로 혼합비율에 따른 순환골재 콘크리트의 길이변화 및 동결융해에 대한 내구특성은 보통콘크리트와 유사한 경향으로 나타났다. 콘크리트용 순환 잔골재의 비율은 총 골재량의 25 %(총잔골재의 50 %)까지 적용하면 슬럼프 및 공기량에 문제가 없을 것으로 판단되며, 설계기준강도에 따른 분체량과 단위수량 및 공기연행제량에 대한 관리가 필요할 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원 민간수탁사업(과제코드: 20210202-001) 지원에 의해 수행되었습니다. 이에 감사드립니다.

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