KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Autogenous Shrinkage Model of High Performance Concrete with Shrinkage Reduction Additive and Expansive Producing Admixture

수축저감제 및 팽창재가 혼입된 고성능콘크리트의 자기수축 모델에 관한 연구

Yoo, Sung-Won;Kim, Do-Gyum;Kho, Kyung-Taek;Jung, Sang-Hwa
유성원;김도겸;고경택;정상화

  • Published : 2004.11.30

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Abstract

The autogenous shrinkage of high-performance concrete is important in that it can lead the early cracks in concrete structures. The purpose of the present study is to explore the autogenous shrinkage of high-performance concrete with shrinkage reduction additivet and expansive producing admixture and to derive a realistic equation to estimate the autogenous shrinkage model of that. For this purpose, comprehensive experimental program has been set up to observe the autogenous shrinkage for various test series. Major test variables were the contents of shrinkage reduction additive and expansive producing admixture, and water-cement ratio was fixed with 30%. The flow rate, compressive strength, surface tension and autogenous shrinkage were measured for the specimens. The test results indicate that the test specimens have the properties of high-performance concrete. The autogenous shrinkage of high performance concrete (HPC) is found to decrease with increasing shrinkage reduction additive and expansive producing admixture. In case of combined use, the autogenous shrinkage is more reduction than in case of separate use. A prediction equation to estimate the autogenous shrinkage of HPC with shrinkage reduction additive and expansive producing admixture was derived and proposed in this study. The proposed equation show reasonably good correlation with test data on autogenous shrinkage of HPC with shrinkage reduction additive and expansive producing admixture.

고성능 콘크리트의 자기수축은 초기균열을 유도할 수 있기 때문에 내구성 측면에서 매우 중요하다. 이에 따라, 본 연구에서는 수축저감제 및 팽창재를 혼입한 고성능 콘크리트의 자기수축 특성에 대한 실험연구를 통해 적절한 예측모델을 제안하고자 하였다. 이를 위해 다양한 실험변수를 가진 시편에 대해 광범위한 실험을 수행하였다. 주요 실험변수는 수축저감제 및 팽창재 혼입률로 설정하였으며 물-시멘트비는 30%로 고정하였다. 콘크리트의 유동성, 압축강도, 표면장력 측정 및 자기수축 실험 등을 수행하였으며, 본 연구에 사용된 콘크리트 시편은 고성능 콘크리트의 범주에 들어가는 것으로 판단된다. 수축저감제 및 팽창재의 혼입량이 클수록 고성능 콘크리트의 자기수축 양은 감소하는 경향을 보였다. 또한, 두 가지 혼화재료를 병용하는 경우에는 자기수축을 저감하는데 더욱 효율적인 결과를 나타내었다 한편, 본 연구에서는 실험결과에 대한 회귀분석을 통해 수축저감제 및 팽창재를 혼입한 고성능 콘크리트의 자기수축 예측식을 제안하였으며, 제안된 자기수축 예측식은 실험결과와 비교적 일치하였다.

Keywords

References

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