Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Study on Quality Improvement and Verification of Recycled Coarse Aggregate for Concrete Using an Impact Crusher with Radial Rotation

방사형 회전이 추가된 임팩트 크러셔를 이용한 콘크리트용 순환굵은골재 품질향상 및 검증 연구

  • 전덕우 (강원대학교 지역건설공학과) ;
  • 김용성 (강원대학교 지역건설공학과) ;
  • 전찬수 (한국건설기술연구원 건설시험인증본부) ;
  • 최원영 (한국건설기술연구원 건설시험인증본부) ;
  • 조원익 (금강개발 기술연구소)
  • Received : 2021.10.08
  • Accepted : 2022.06.06
  • Published : 2022.06.30
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Abstract

The purpose of this study is to develop an impact crusher with a radial rotating plate installed at the bottom, which is a shock absorber that can produce high-quality recycled coarse aggregate for concrete and to verify the effect of improving the quality performance of recycled coarse aggregate and its applicability through concrete tests. As a result, it showed improved quality in all items such as absolute dry density, absorption rate, abrasion resistance, Particle shape judgment rate, amount lost in the 0.08 mm sieve passing test, alkali aggregate reaction, clay mass, stability, and impurity content, and it was found to meet the criteria of recycled aggregate quality standards. In addition, the air volume and slump of concrete to which recycled coarse aggregate is applied meet all domestic standards. According to the test results of the compressive strength characteristics by age of concrete according to the mixing ratio of the recycled coarse aggregate, it was confirmed that the mixing ratio of the recycled coarse aggregate was applicable up to 60 %.

본 연구는 고품질의 콘크리트용 순환골재를 생산할 수 있는 타격 완충 장치인 방사형 회전판을 하단에 설치한 임팩트 크러셔를 개발하고 이를 이용하여 생산한 순환굵은골재의 품질성능 향상 효과 및 콘크리트 실험을 통해 적용 가능 여부를 검증하는 것을 목적으로 한다. 그 결과, 절대건조밀도, 흡수율, 마모감량, 입자모양판정실적률, 0.08 mm 체 통과량 시험에서 손실된 양, 알칼리골재반응, 점토덩어리량, 안정성, 이물질함유량 등 모든 항목에서 개선된 품질을 나타내었고 순환골재 품질기준에서 규정하는 기준에 부합하는 것으로 나타났다. 또한, 순환굵은골재를 적용한 콘크리트의 공기량 및 슬럼프는 국내 기준에 모두 부합하며 순환굵은골재의 혼입률에 따른 콘크리트의 재령별 압축강도 특성 실험 결과에 따라 순환굵은골재의 혼입률 60% 까지는 적용이 가능할 것으로 확인되었다.

Keywords

Acknowledgement

본 연구는 2022년도 한국건설기술연구원 평가인증사업의 지원해 의해 수행된 연구임(NO. 20220037-001).

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