Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Reducing Hydration Heat of Mass Concrete by Applying Combination of Powdered Materials and CGS as Fine Aggregate

분체계 재료조합 및 석탄 가스화 용융 슬래그를 잔골재로 활용한 매스 콘크리트 수화열 저감

  • Park, Sang-Won (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Han, Jun-Hiu (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Han, Min-Cheol (Dept. of Architectural Engineering, Cheong ju University)
  • Received : 2023.12.11
  • Accepted : 2024.02.05
  • Published : 2024.04.20
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Abstract

In this study, to suggest an efficient method of using coal gasification slag(CGS), a byproduct from integrated gasification combined cycle(IGCC), as a combined fine aggregate for concrete mixture, the diverse performances of concrete mixtures with combined fine aggregates of CGS, river sand, and crushed sand were evaluated. Additionally, using CGS, the reduction of the hydration heat and the strength developing performance were analyzed to provide a method for reducing the heat of hydration of mass concrete by using combined fine aggregate with CGS and replacing fly ash with cement. The results of the study can be summarized as follows: as a method of recycling CGS from IGCC as concrete fine aggregate, a combination of CGS with crushed sand offers advantages for the concrete mixture. Additionally, when the CGS combined aggregate is used with low-heat-mix designed concrete with fly ash, it has the synergistic effect of reducing the hydration heat of mass concrete compared to the low-heat-designed concrete mixture currently in wide use.

본 연구는 분체계 재료조합 시멘트 및 CGS 잔골재 조합에 따른 콘크리트의 단열온도상승 시험결과를 통해 최적의 조합 비율을 도출하고, 이를 토대로 모의부재 시험 및 수화열 해석을 통하여 매스 콘크리트 구조물에서의 수화열 저감 성능에 대한 현장 적용성을 분석하였다. 분석결과 TBC+CGS 50%조합에서 콘크리트 중앙부와 표면부의 온도차이가 감소하며, 최고 온도 도달시간이 지연되어 시간경과에 따른 표면부 인장강도 증가로 온도응력에 따른 온도균열 발생을 저감시킬 수 있을 것으로 판단된다.

Keywords

References

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