Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Development of Flowable Backfill Material Using Waste Oyster Shell, Coal Ash, and Surplus Soil

굴패각, 석탄회 및 굴착잔토를 이용한 무다짐 처리공법용 뒷채움재 개발

  • Kim, Min-Jin (Department of Chemical & Biological Engineering and ERI) ;
  • Wang, Xue (Department of Chemical & Biological Engineering and ERI) ;
  • Lee, Je Joo (Samheung Construction Co. Ltd.) ;
  • Lee, Sang Ho (Samheung Construction Co. Ltd.) ;
  • Kim, Sung Bae (Department of Chemical & Biological Engineering and ERI) ;
  • Kim, Chang-Joon (Department of Chemical & Biological Engineering and ERI)
  • 김민진 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 왕설 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 이재주 (삼흥토건 주식회사) ;
  • 이상호 (삼흥토건 주식회사) ;
  • 김성배 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 김창준 (경상대학교 생명화학공학과 및 공학연구원)
  • Received : 2013.08.19
  • Accepted : 2013.09.30
  • Published : 2013.12.31
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Abstract

This study aimed to develop flowable backfill material using oyster shell, coal ash, and surplus soil. The high temperature (> $800^{\circ}C$) reaction was required to convert $CaCO_3$ to CaO. The solid specimens formed by pozzlanic reaction between CaO and coal ash showed low unconfined compressive strength. The effect of kaolin and blast furnace slag was also examined. It was found that CaO and coal ash could not be utilized due to high cost and low performance. The use of oyster shell without calcination ($CaCO_3$) was evaluated. The specimens composing of oyster shell and cement showed the higher unconfined compressive strength than that composing of coal ash and cement. However, use of oyster shell is limited in mortar due to the presence of salt. Addition of soil into oyster shell-coal ash-cement mixture satisfied the specification of flowable backfill material by optimizing their ratio.

본 연구의 목표는 폐자원인 굴패각과 석탄회, 굴착잔토를 이용하여 경제성 있는 무다짐용 유동성 뒷채움재를 개발하는데 있다. 굴패각을 생석회(CaO)로 전환하는데 고온($800^{\circ}C$ 이상)의 에너지가 필요하였지만, 생석회와 석탄회의 포즐란 반응에 의해 생성된 고화물 공시체의 일축압축강도는 높지 않았다. 생석회와 고령토 또는 고로슬래그의 반응 생성물 공시체의 압축 강도를 측정하였다. 실험결과로부터 포즐란 반응을 통한 고화물 생성은 경제성이 없는 것으로 판명되었다. 굴패각($CaCO_3$)과 석탄회를 잔골재 개념으로 그 사용 가능성을 검토하였다. 굴패각과 시멘트 혼합물이 석탄회와 시멘트 혼합물보다 높은 강도를 나타내었다. 굴패각에 포함된 염분으로 인하여 콘크리트에 혼입되는 굴패각 양을 제한하는 것을 고려한다면, 시멘트, 굴패각, 석탄회 혼합물이 좋은 뒷채움재로 사용될 수 있을 것으로 판단되었다. 추가적으로 흙을 첨가하는 경우 고화물의 일축압축강도가 감소하였지만 최적화된 혼합비에서 뒷채움재 기준(일축압축강도와 유동성)을 모두 만족하는 결과를 나타내었다. 본 연구결과는 시멘트, 굴패각, 석탄회, 굴착잔토의 배합비를 최적화함으로써 경제성 있는 뒷채움재를 개발할 수 있다는 것을 보여준다.

Keywords

References

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