Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Characteristics of Concrete Using Coal-By-product as Fine Aggregate

석탄 부산물인 경석을 잔골재로 사용한 콘크리트의 특성

  • In-Hwan Yang (Department of Civil Engineering, Kunsan National University) ;
  • Seung-Tae Jeong (Department of Civil Engineering, Kunsan National University) ;
  • Geun-Woo Park (Department of Civil Engineering, Kunsan National University) ;
  • Gyeong-Min Choi (Department of Civil Engineering, Kunsan National University)
  • 양인환 (군산대학교 토목공학과) ;
  • 정승태 (군산대학교 토목공학과) ;
  • 박근우 (군산대학교 토목공학과) ;
  • 최경민 (군산대학교 토목공학과)
  • Received : 2024.01.17
  • Accepted : 2024.02.01
  • Published : 2024.03.30
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Abstract

In this paper, an experimental study on the strengths and material properties of concrete manufactured by using coal gangue, as a fine aggregate was conducted. Experimental parameters included coal gangue aggregate contents as a replacement of fine aggregate by 50 % and 100 % (by volume) and fly ash contents. The water-binder ratio was fixed at 0.38. In addition, 30 % of the OPC binder was replaced with fly ash in some mixtures. Test of the unit weight, compressive, split tensile, and flexural tensile strength of concrete were performed and test results were analyzed. Unit weight, compressive strength, split tensile strength, and flexural tensile strength decreased as the coal recycled aggregates increased. In addition, TGA and SEM experiments, which are microstructure experiments, were conducted to analyze thermogravimetric analysis and ITZ by section.

본 논문에서는 석탄 부산물인 경석을 잔골재로 사용하여 제작한 콘크리트의 강도 및 물성 실험 연구를 수행하였다. 본 연구에서는 석탄 부산물 골재 함유량과 플라이애시 함유량을 실험변수로 고려하였다. 천연 잔골재의 50 %와 100 %(부피 기준)를 석탄 부산물로 치환하였고 물-바인더 비는 0.38로 고정하였다. 또한, 일부 배합은 OPC 바인더의 30 %를 플라이애시로 치환하여 콘크리트 시편을 제작하였다. 단위질량, 압축강도, 쪼갬인장강도 및 휨인장강도를 실험을 진행하고 실험결과 분석을 수행하였다. 플라이애시 바인더가 함유되고 천연 잔골재 대비 석탄 부산물 골재의 치환율이 증가할수록 콘크리트 단위질량, 압축강도, 쪼갬인장강도 및 휨인장강도는 감소하였다. 또한, 미세구조 실험인 TGA와 SEM 실험을 진행하여 구간별 열중량분석과 ITZ를 분석하였다.

Keywords

Acknowledgement

본 연구는 중소벤처기업부의 지역특화산업육성(1423369998)의 지원에 의한 연구입니다.

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