Separation of Recycled Aggregates from Waste Concrete by Heavy Medium Separation

폐콘크리트에서 중액선별(重液選別)을 이용한 재생골재(再生骨材)의 선별(選別)

  • Lee, Myung-Gyu (Department of Resources Engineering, Dong-A University) ;
  • Kwon, Ki-O (Department of Resources Engineering, Dong-A University) ;
  • Gayabazar, Ganbileg (Department of Resources Engineering, Dong-A University) ;
  • Kang, Heon-Chan (Department of Resources Engineering, Dong-A University)
  • Published : 2007.10.27

Abstract

The recycled aggregates produced from waste concrete by crushing and granularity adjusting processes only can't be used for structural aggregates because they display low density and high abrasion rate by including lots of mortar and cement paste. However, the recycled aggregates include a lot of aggregates for concrete. Using the heavy medium separation method that is one of the specific gravity separation methods, about 45% of the waste concrete could be converted to the recycled aggregates.

폐콘크리트를 재활용하기 위하여 파쇄과정과 입도조절과정을 거쳐서 생산된 재생골재에는 모르타르나 시멘트페이스트가 많이 부착되어 있어 밀도가 낮고 흡수율이 높아 구조용 골재로 사용할 수 없는 실정이다. 그러나 생산된 재생골재 내에는 많은 양의 콘크리트용 재생골재가 포함되어 있으며 이들을 비중선별방법 중 중액선별을 통해 선별하여 콘크리트용 1종 재생골재를 약 45%정도를 생산할 수 있었다.

Keywords

References

  1. Sea-Hyun Lee, 2001: 재생골재의 재활용 활성화 방안, Journal of Korean Society of Road Engineers 3(1), pp. 96-102
  2. Kyoung-Rok Kong, Sung-Yul An, Heon-Chan Kang, 2004: The Characteristic Study by Particle size and Distribution of Recycled Aggregates, Proceedings of The Korean Institute of Resources Recycling 23, pp.133-137
  3. Kyoung-Rok Kong, Heon-Chan Kang, 2004: A Study on Application of Recycled Aggregate for Concrete,東亜大學校 附設 環境問題研究所 研究報告 第26巻 pp.1-9