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Prediction Model for Autogenous Shrinkage of High Strength Fly Ash Concrete
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 Title & Authors
Prediction Model for Autogenous Shrinkage of High Strength Fly Ash Concrete
Lee, Hoi-Keun; Lee, Kwang-Myong; Kim, Woo;
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 Abstract
Autogenous shrinkage, a significant contributor of early-age cracking of high strength concrete (HSC), must be avoided or minimized from an engineering point of view. Therefore, it is necessary to study how to reduce and to predict autogenous shrinkage with respect to tile control of early-age cracking. In this study, autogenous shrinkage of HSC with various water-binder ratio (W/B) ranging from 0.50 to 0.27 and fly ash content of 0, 10, 20, and 30% were investigated. Based on the test results, thereafter, a prediction model for autogenous shrinkage was proposed. Test results show that autogenous shrinkage increased and more rapidly developed with decreasing the W/B. Also, the higher fly ash contents, the smaller autogenous shrinkage. In particular, even if much autogenous shrinkage occurs at very early-ages, stress may not be developed while the stiffness of concrete is low. In order to consider the change of concrete stiffness, the transition time referred as stiffening threshold, was obtained by monitoring of ultrasonic pulse velocity evolution and considered in the autogenous shrinkage model. From a practical point of view, the proposed model can be effectively used to predict autogenous shrinkage and to estimate stress induced by autogenous shrinkage.
 Keywords
high strength concrete;autogenous shrinkage;prediction model;fly ash;ultrasonic pulse velocity;
 Language
Korean
 Cited by
1.
혼화재료 혼입에 따른 고성능 콘크리트의 자기수축 예측에 관한 연구,유성원;김도겸;고경택;정상화;

대한토목학회논문집, 2004. vol.24. 5A, pp.1111-1118
2.
플라이 애쉬 콘크리트의 압축 강도 및 내구 특성,김광수;장승엽;이광명;

대한토목학회논문집, 2004. vol.24. 4A, pp.703-711
3.
고로슬래그를 함유한 콘크리트의 자기수축 특성,이광명;권기헌;이회근;이승훈;김규용;

한국콘크리트학회논문집, 2004. vol.16. 5, pp.621-626 crossref(new window)
4.
초고성능 콘크리트의 자기수축 특성,김성욱;최성;이광명;박정준;

한국콘크리트학회논문집, 2011. vol.23. 3, pp.295-301 crossref(new window)
5.
분말형 수축저감제와 플라이애쉬가 혼입된 콘크리트의 건조수축 거동,민경환;이동규;최홍식;

한국산학기술학회논문지, 2015. vol.16. 5, pp.3535-3541 crossref(new window)
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