Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Properties of Autogenous Shrinkage according to Hydration Heat Velocity of High Strength Concrete Considering Mass Member

매스부재를 고려한 고강도콘크리트의 수화발열상승속도 조절에 따른 자기수축 특성

  • Koo, Kyung-Mo (Department of Architectural Engineering, Chungnam University) ;
  • Kim, Gyu-Yong (Department of Architectural Engineering, Chungnam University) ;
  • Hong, Sung-Hyun (Department of Architectural Engineering, Chungnam University) ;
  • Nam, Jeong-Soo (Department of Architectural Engineering, Chungnam University) ;
  • Shin, Kyoung-Su (Department of Architectural Engineering, Chungnam University) ;
  • Khil, Bae-Su (Research Institute of Technology, Tripod Co.)
  • Received : 2011.12.06
  • Accepted : 2012.06.18
  • Published : 2012.08.20
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Abstract

In this study, to reduce the hydration heat velocity (HHV) of high-strength mass concrete at early ages, phase change materials (PCM) that could absorb hydration heat were applied, and the changes in autogenous shrinkage were investigated, as well as the relationship between the hydration temperature and autogenous shrinkage. The acceleration of the cement hydration process by the PCM leads to an early setting and a higher development of the compressive strength and elastic modulus of concrete at very early ages. The function of PCM could be worked below the original melting point due to the eutectic effect, while the hydration temperature and HHV of high-strength mass concrete can be decreased through the use of the PCM. A close relationship was found between the hydration temperature and autogenous shrinkage: the higher the HHV, the greater the ultimate autogenous shrinkage.

본 연구에서는 초기재령에 있어 매스부재를 고려한 고강도콘크리트에 대해 수화발열상승속도를 저감시키기 위한 방안의 일환으로 열흡수성능이 있는 상전이물질을 사용하였다. 또한 수화발열상승속도의 조절에 의한 고강도콘크리트의 자기수축 특성 변화를 분석하고자 하였다. 그 결과, 상전이물질은 시멘트 수화반응을 촉진함으로서 초기재령에 빠른 응결시간과 높은 압축강도 발현을 나타냈다. 또한 수화열 및 수화발열상승속도를 저감시키고, 자기수축량을 감소시키는 결과를 나타내었다. 이를 통해 초기재령의 수화발열상승 속도의 조절에 의해 자기수축량의 저감이 가능하다고 판단된다.

Keywords

References

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