Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Comparison on Characteristics of Concrete Autogenous Shrinkage according to Strength Level, Development Rate and Curing Condition

콘크리트 강도, 발현 속도 및 양생조건에 따른 자기수축 특성 비교

  • Yang, Eun-Ik (Dept. of Civil Engineering, Gangneung-wonju National University) ;
  • Shin, Jung-Ho (Dept. of Civil Engineering, Gangneung-wonju National University) ;
  • Choi, Yoon-Suk (Dept. of Civil Engineering, Gangneung-wonju National University) ;
  • Kim, Myung-Yu (Dept. of Civil Engineering, Gangneung-wonju National University) ;
  • Lee, Kwang-Myong (Dept. of Civil and Environmental System Engineering, Sungkyunkwan University)
  • 양은익 (강릉원주대학교 토목공학과) ;
  • 신정호 (강릉원주대학교 토목공학과) ;
  • 최윤석 (강릉원주대학교 토목공학과) ;
  • 김명유 (강릉원주대학교 토목공학과) ;
  • 이광명 (성균관대학교 사회환경시스템공학과)
  • Received : 2011.06.30
  • Accepted : 2011.11.22
  • Published : 2011.12.31
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Abstract

In this study, autogenous shrinkage strain and prediction models of concrete specimens were compared with strength level and development rate. Also, concrete autogeneous shrinkage under various curing conditions was investigated. The results showed that autogeneous shrinkage increased as concrete strength increased. However, when the concrete strength was almost identical, the initial autogeneous shrinkage of OPC was larger than BFS, but the final autogeneous shrinkage of BFS was larger than OPC. Early wet curing reduced autogeneous shrinkage strain. Especially, when the early wet curing was applied for more than 24 hours, final autogeneous shrinkage was significantly reduced. The results showed that the existing EC2 models do not reflect concrete properties properly. Therefore, the revised model was proposed to better predict autogeneous shrinkage.

이 연구에서는 강도수준 및 강도발현 속도에 따른 콘크리트의 자기수축과 예측모델의 적용성을 비교하였고, 다양한 양생조건을 적용시켜 자기수축을 검토하였다. 연구 결과에 따르면 콘크리트가 강도가 증가할수록 자기수축이 증가하는 것으로 나타났다. 그러나 동일한 콘크리트 강도의 경우라도 강도발현 속도가 빠른 OPC의 경우 초기 자기수축은 크지만 최종 자기수축은 BFS의 경우가 더 큰 것으로 나타났다. 초기 습윤양생은 자기수축 저감에 영향을 미치며 특히 24시간 이상 습윤양생을 실시하면 최종 자기수축은 크게 감소하는 것으로 나타났다. 기존의 EC2모델은 콘크리트 특성을 적절히 반영하지 못하는 것으로 나타났으며 자기수축을 보다 효과적으로 예측할 수 있는 수정 모델식을 제안하였다.

Keywords

References

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