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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第8期    总第240期    2014年8月

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文章编号:1672-7207(2014)08-2830-09
不同干湿条件下混凝土表层内水分传输
刘鹏1, 2,宋力1,2,余志武1, 2

(1. 中南大学 土木工程学院,湖南 长沙,410075;
2. 中南大学 高速铁路建造技术国家工程实验室,湖南 长沙,410075
)

摘 要: 研究润湿、干燥和干湿交替条件下混凝土表层内水分传输规律,通过理论分析推导混凝土表层内水分传输模型。基于菲克定律和达西定律探讨混凝土表层内水分传输相关性,并利用实测结果验证所建模型的合理性;此外,还探讨采用BET等温吸附曲线构筑混凝土内水分特征曲线的可行性。研究结果表明:所建混凝土表层内水分传输模型可描述不同条件下混凝土内水分传输规律,但扩散系数取值需根据条件不同而定。采用等温吸附曲线获得混凝土内水分特征曲线与传统求解结果相似,从而为简化求解过程提供了新途径;所求解的混凝土内水分等效扩散系数不同是各传输模型假设机理不同造成的。

 

关键词: 混凝土;液岛;水蒸气;水分传输

Water transport in concrete cover under different drying-wetting conditions
LIU Peng1, 2, SONG Li1, 2, YU Zhiwu1, 2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China

Abstract: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.

 

Key words: concrete; liquid island; water vapor; water transport

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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