Computers and Concrete

  • 제3권2_3호
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  • Pages.103-122
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  • 2006
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

The coupling effect of drying shrinkage and moisture diffusion in concrete

  • Suwito, A. (Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder) ;
  • Ababneh, Ayman (Department of Civil and Environmental Engineering, Clarkson University) ;
  • Xi, Yunping (Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder) ;
  • Willam, Kaspar (Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder)
  • 투고 : 2005.08.26
  • 심사 : 2006.04.18
  • 발행 : 2006.04.01
⟨ 이전 논문 다음 논문 ⟩

초록

Drying shrinkage of concrete occurs due to the loss of moisture and thus, it is controlled by moisture diffusion process. On the other hand, the shrinkage causes cracking of concrete and affects its moisture diffusion properties. Therefore, moisture diffusion and drying shrinkage are two coupled processes and their interactive effect is important for the durability of concrete structures. In this paper, the two material parameters in the moisture diffusion equation, i.e., the moisture capacity and humidity diffusivity, are modified by two different methods to include the effect of drying shrinkage on the moisture diffusion. The effect of drying shrinkage on the humidity diffusivity is introduced by the scalar damage parameter. The effect of drying shrinkage on the moisture capacity is evaluated by an analytical model based on non-equilibrium thermodynamics and minimum potential energy principle for a two-phase composite. The mechanical part of drying shrinkage is modeled as an elastoplastic damage problem. The coupled problem of moisture diffusion and drying shrinkage is solved using a finite element method. The present model can predict that the drying shrinkage accelerates the moisture diffusion in concrete, and in turn, the accelerated drying process increases the shrinkage strain. The coupling effects are demonstrated by a numerical example.

키워드

참고문헌

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피인용 문헌

  1. Simulation of Humidity Fields in Concrete: Experimental Validation and Parameter Estimation vol.13, pp.4, 2015, https://doi.org/10.3151/jact.13.214
  2. Thermo–hygro–mechanical modelling of self-induced stresses during the service life of RC structures vol.33, pp.12, 2011, https://doi.org/10.1016/j.engstruct.2011.07.008
  3. Effect of aggregates and microcracks on the drying rate of cementitious composites vol.38, pp.10, 2008, https://doi.org/10.1016/j.cemconres.2008.03.015
  4. Literature Review of Coupled Temperature and Moisture Transfer in Concrete Structure vol.744-746, pp.1662-7482, 2015, https://doi.org/10.4028/www.scientific.net/AMM.744-746.1439
  5. Investigation of Tensile Creep of a Normal Strength Overlay Concrete vol.11, pp.6, 2018, https://doi.org/10.3390/ma11060993