Water transport in concrete cover under different drying-wetting conditions

作者：Liu Peng; Song Li^*; Yu Zhiwu

来源：Journal of Central South University(Science and Technology), 2014, 45(8): 2830-2838.

• Characteristic curve
• Concrete cover
• Drying-wetting
• Isothermal adsorption curve
• Situ measurement
• Water transport
• Water transportation
• Wetting-drying

The law of water transport in concrete cover was investigated under different conditions including wetting, drying, wetting-drying, and the models of water transport in concrete cover were also deduced. Based on the laws of Fick's and Darcy's, the correlation of the water transport in concrete cover was discussed and the rationality of the model was proved by situ measurement. In addition, the feasibility of describing the moisture characteristic curve obtained from the BET isothermal adsorption curve was verified. The results show that the models of the water transport in concrete can be used to describe the change law of the water transportation under different conditions, but the diffusivity should be determined according to the conditions. The BET isothermal adsorption curve can be used to represent the characteristic curve obtained usually by traditional way, which provides a novel method to simplify the process. The equivalent diffusivities of the water in concrete differing from each others are caused by the difference of the hypothesis mechanism.

• 出版日期2014
• 单位中南大学