Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Properties of Fresh State and Characteristics of Shrinkage in Concrete Containing Low Fineness GGBFS

저분말도 고로슬래그 미분말을 혼입한 콘크리트의 굳지 않은 상태의 특성 및 수축 특성

  • Kim, Tae-Hoon (Department of Civil and Environmental Engineering, Hannam University) ;
  • Yoon, Yong-Sik (Department of Civil and Environmental Engineering, Hannam University) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Engineering, Hannam University)
  • 김태훈 (한남대학교 토목환경공학과) ;
  • 윤용식 (한남대학교 토목환경공학과) ;
  • 권성준 (한남대학교 토목환경공학과)
  • Received : 2019.08.28
  • Accepted : 2019.10.01
  • Published : 2020.03.30
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Abstract

GGBFS(Ground Granulated Blast Furnace Slag) is one of the most actively used mineral admixtures with excellent long-aged strength and chloride diffusion resistance. Unlike Standard covering GGBFS in Japan and the U.K., the domestic standard for GGBFS does not contain low fineness of GGBFS under 4000 grade. In this paper, several basic tests are carried out for the concrete with 3,000 grade GGBFS concrete and ternary blended concrete for reducing hydration heat by mixing 4,000 grade GGBFS and fly ash, such as fresh concrete properties, compressive strength, and shrinkage properties. The air content and slump between the ternary blended concrete and the concrete with low-fineness GGBFS showed the similar level, and the results of difference in setting time from them were less than 20 minutes, showing no significant difference. In the evaluation of compressive strength and shrinkage characteristics, the ternary blended concrete showed lower long-aged strength and higher shrinkage than the low-fineness GGBFS concrete.

고로슬래그 미분말은 뛰어난 장기 강도와 염해 저항성 등을 바탕으로 활발히 사용되는 혼화재들 중 하나이다. 국내 규격(KSF 2563)은 저분말도 GGBFS를 가지고 있는 일본 및 영국의 규격과는 다르게 3종의 GGBFS가 모두 고분말도에 포함된다. 본 연구에서는 4,000급 고로슬래그 미분말와 플라이애시를 혼입한 수화열 저감용 삼성분계 배합과 3,000급 GGBFS를 혼입한 배합의 굳지 않은 콘크리트 특성, 압축 강도, 수축 특성을 분석하였다. 수화열 저감용 삼성분계 배합과 저분말도 고로슬래그 미분말을 혼입한 배합 간에 공기량과 슬럼프는 동일한 값을 나타내었으며 초결 및 종결 시간의 경우 20분 내외의 결과를 나타내어 큰 차이가 나타나지 않았다. 압축 강도와 수축 특성 분석에서 삼성분계 배합은 저분말도 GGBFS를 혼입한 배합보다 더 낮은 장기 강도와 높은 수축량을 나타내었다.

Keywords

References

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