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분말형 수축저감제와 플라이애쉬가 혼입된 콘크리트의 건조수축 거동

Drying Shrinkage Behaviors of Concrete with Powder Type Shrinkage Reducing Agent and Fly Ash

  • Min, Kyung-Hwan (Research Institute for Engineering & Technology, Chungcheong University) ;
  • Lee, Dong-Gyu (Research Institute for Engineering & Technology, Chungcheong University) ;
  • Jeong, Yong-Wook (Department of Civil Engineering, Chungcheong University)
  • 투고 : 2015.04.07
  • 심사 : 2015.05.07
  • 발행 : 2015.05.31

초록

본 연구에서는 콘크리트의 건조수축을 저감하기 위한 연구의 일환으로 분말형 수축저감제와 플라이애쉬를 활용한 콘크리트의 건조수축 특성에 관한 일련의 실험을 수행하였다. 수축저감제와 플라이애쉬로 각각 2% 및 20%씩 시멘트를 대체한 배합에 대해, 강도 실험과 수축실험을 실시하였다. 역학적 특성은 목표 강도를 획득하는 것으로 확인되었고, 비구속 수축실험 결과 수축저감제가 약 $200{\mu}{\varepsilon}$의 건조수축 감소 효과를 발생시키는 것으로 나타났다. 링테스트에서는 수축저감제를 적용한 배합은 인장크리프 효과로 인해 균열 발생시기가 약 2배 정도 증가하였다.

In this study, series of tests were performed for drying shrinkage characteristics of concrete with power type shrinkage reducing agent (SRA) and fly ash as a part of research to reduce drying shrinkage of concrete. Firstly, for the mechanical properties, a target strength was acquired securely. In the unrestraint shrinkage tests, the SRA decreased the drying shrinkage about $200{\mu}{\varepsilon}$. Lastly, in the ring tests, due to the tensile creep effect, the concrete with SRA showed the cracking times as much again as the concrete with ordinary Portland cement only did.

키워드

참고문헌

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