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The Effective Control of Hot Weather Concreting by Optimum Mineral and Chemical Admixtures

혼화재 및 혼화제의 조절에 의한 서중 콘크리트의 효과적 관리

  • Lee, Dongyule (Department of Safety Engineering, Incheon National University) ;
  • Ham, Suyun (Department of Civil and Environmental Engineering, The University of Illinois at Urbana Champaign) ;
  • Oh, Taekeun (Department of Safety Engineering, Incheon National University)
  • 이동율 (인천대학교 안전공학과) ;
  • 함수윤 (일리노이주립대학교 토목공학과) ;
  • 오태근 (인천대학교 안전공학과)
  • Received : 2015.02.11
  • Accepted : 2015.03.19
  • Published : 2015.06.30

Abstract

The undesirable effects of elevated external temperatures at placement on the properties of the fresh and hardened concrete are discussed briefly, and the possible use of the mineral admixtures to mitigate them and the association with water-reducing and retarding admixtures in terms of the mix design which are critical for minimizing slump loss and entrained air loss are examined in this study. To investigate the effects of such the mineral and chemical admixtures on the fresh and hardened properties of concrete exposed to high temperature, a series of concrete mixtures subjected to the high temperature were carried out and then fresh and hardened properties of the mixtures were analyzed and evaluated. Based on the results, new guide lines concerning the appropriate admixtures for hot weather are suggested.

본 연구는 슬럼프 감소, 연행 공기 부족, 건조수축 균열, 강도감소 등 굳지 않은 콘크리트와 굳은 콘크리트의 성질에 대한 타설시 고온의 악영향에 대한 원인분석을 실시하고 이를 경감시키기 위한 감수제, 공기연행제, 지연제 등의 화학적 혼화제와 플라이 애쉬, 고로 슬래그 등의 무기질 혼화재의 다양한 적용이 검토되었다. 즉, 서중 콘크리트의 품질향상을 위한 다양한 콘크리트 배합이 설계되고 각 배합에서의 굳지 않은 콘크리트 및 굳은 콘크리트 에 대한 영향이 분석되고 몇 가지의 최적 배합이 도출되었다.

Keywords

References

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