Numerical Analysis of Moisture Influential Depth in Concrete During Drying-Wetting Cycles

被引：0

作者：

Li, Chunqiu ^{[1
]}

Li, Kefei ^{[1
]}

Chen, Zhaoyuan ^{[1
]}

机构：

[1] Key Laboratory of Structural Engineering and Vibration, Ministry of Education, Department of Civil Engineering, Beijing

来源：

Tsinghua Science and Technology | 2008年 / 13卷 / 05期

基金：

中国国家自然科学基金;

关键词：

concrete; drying-wetting cycles; durability; influential depth;

D O I：

10.1016/s1007-0214(08)70110-x

中图分类号：

学科分类号：

摘要：

The influential depth of moisture transport in a concrete surface subject to drying-wetting cycles was analyzed numerically. The moisture transport was described by a diffusion model with different diffusivities for drying and wetting. A finite difference scheme was developed to solve the partial differential equations. The influential depth was then investigated numerically for initially saturated and unsaturated concretes exposed to drying-wetting actions in marine environments using an equilibrium time ratio concept. The equilibrium time ratio was calculated numerically for a saturated condition and the moisture influential depth is shown to be a linear function of the square root of the drying time. However, this equilibrium time ratio does not exist for an unsaturated condition and the moisture influential depth depends on the initial saturation as well as the drying-wetting time ratio. The results indicate that this model gives more realistic predictions of moisture transport of in situ structural concrete and its durability. © 2008 Tsinghua University Press.

引用

页码：696 / 701

页数：5

共 18 条

[1]

Mehta P.K., Durability-critical issues for the future, Concrete International, 19, 7, pp. 27-32, (1997)

[2]

Cerny R., Rovnanikova P., Transport Processes in Concrete, (2002)

[3]

Wong S.F., Wee T.H., Swaddiwudhipong S., Et al., Study of water movement in concrete, Magazine of Concrete Research, 53, 3, pp. 205-220, (2001)

[4]

Meijers S.J.H., Bijen J.M.J.M., De Borst R., Fraaij A., Computational results of a model for chloride ingress in concrete including convection, drying-wetting cycles and carbonation, Materials and Structures, 28, 276, pp. 145-154, (2005)

[5]

Arfvidsson J., A new algorithm to calculate the isothermal moisture penetration for periodically varying relative humidity at the boundary, Nordic Journal of Building Physics, 2, (1999)

[6]

Cunningham M.J., Moisture diffusion due to periodic moisture and temperature boundary conditions-An approximate steady analytical solution with non-constant diffusion coefficients, Building and Environment, 27, 3, pp. 367-377, (1992)

[7]

Torrenti J.M., Granger L., Diruy M., Et al., Modeling concrete shrinkage under variable ambient conditions, ACI Materials Journal, 96, 1, pp. 35-39, (1999)

[8]

Janssen H., Blocken B., Carmeliet J., Conservative modelling of the moisture and heat transfer in building components under atmospheric excitation, International Journal of Heat and Mass Transfer, 50, 5-6, pp. 1128-1140, (2007)

[9]

Mainguy M., Coussy O., Baroghel-Bouny V., The role of air pressure in the drying of weakly permeable materials, Journal of Engineering Mechanics ASCE, 127, 6, pp. 582-592, (2001)

[10]

Coussy O., Poromechanics, (2004)

← 1 2 →