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Computers and Concrete
  Volume 16, Number 5, November 2015 , pages 775-793
DOI: https://doi.org/10.12989/cac.2015.16.5.775
 


Study on moisture transport in concrete in atmospheric environment
Weiping Zhang, Fei Tong, Xianglin Gu and Yunping Xi

 
Abstract
    Moisture transport in concrete in atmospheric environment was studied in this paper. Based on the simplified formula of the thickness of the adsorbed layer, the pore-size distribution function of cement paste was calculated utilizing the water adsorption isotherms. Taking into consideration of the hysteresis effect in cement paste, the moisture diffusivity of cement paste was obtained by the integration of the pore-size distribution. Concrete is regarded as a two-phase composite with cement paste and aggregate, neglecting the moisture diffusivity of aggregate, then moisture diffusivity of concrete was evaluated using the composite theory. Finally, numerical simulation of humidity response during both wetting and drying process was carried out by the finite difference method of partialdifferential equation for moisture transport, and the numerical results well capture the trend of the measured data.
 
Key Words
    concrete; moisture transport; atmospheric environment; pore-size distribution
 
Address
Weiping Zhang, Fei Tong, Xianglin Gu and Yunping Xi: Department of Structural Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
 

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