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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (10): 2010-2015    DOI: 10.3785/j.issn.1008-973X.2010.10.028
岩土工程、土木及建筑工程     
混凝土水分扩散表面因子理论模型与验证
彭智, 金南国, 金贤玉
浙江大学 土木工程学系,浙江 杭州 310058
Theoretical modeling and verification of concrete moisture diffusion surface factor
PENG Zhi, JIN Nan-guo, JIN Xian-yu
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
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摘要：

针对混凝土湿度场对混凝土结构耐久性、混凝土表面干缩应力以及干缩裂缝等的影响,研究混凝土湿度场中水分扩散表面因子这一关键因素.引入混凝土表面孔隙面积和孔隙中的水分扩散系数2个参数,推导混凝土湿度场的第3类边界条件.将混凝土表面水分对流扩散简化为不可压缩流体一维平板壁面对流传质问题,根据质量守恒和平板壁面对流传质理论,建立混凝土干燥过程水分扩散表面因子的理论模型以及模型的近似解.结果表明,理论模型和试验检测结果之间具有良好的相关性.
Abstract:

The moisture diffusion surface factor, the key parameter in moisture field forming, was studied in order to analyze the influence of concrete moisture field on the durability, surface shrinkage stress and shrinkage cracks of concrete. The third boundary condition of concrete moisture field was derived considering the pore areas of concrete surface and the pore moisture diffusion coefficient. The concrete surface moisture convection and diffusion processes were simplified as the convective mass transfer of incompressible fluid in onedimensional flat wall. A theoretical model on the moisture diffusion surface factor of concrete during the curing period was established based on the mass conservation and the flat wall convective mass transfer principle. An approximate solution of the model was provided. Simulation results agreed well with the theoretical model.
出版日期: 2010-10-01
:  TU 973  
基金资助:

国家“973”重点基础研究发展规划资助项目（2009CB623200）；国家自然科学基金资助项目（50838008）；高等学校博士学科点专项科研基金资助项目（20070335087）.
作者简介: 彭智（1984—），男，湖南常德人，硕士生，从事混凝土结构研究.E-mail: pengzhi0736@gmail.com
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引用本文:

彭智, 金南国, 金贤玉. 混凝土水分扩散表面因子理论模型与验证[J]. J4, 2010, 44(10): 2010-2015.

BANG Zhi, JIN Na-Guo, JIN Xian-Yu. Theoretical modeling and verification of concrete moisture diffusion surface factor. J4, 2010, 44(10): 2010-2015.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2010.10.028    或    http://www.zjujournals.com/eng/CN/Y2010/V44/I10/2010

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