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.
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.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2010年第10期2010-2015,共6页
Journal of Zhejiang University：Engineering Science
基金
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)
关键词
混凝土湿度场
水分扩散表面因子
理论模型
对流传质
环境因素
concrete moisture field
moisture diffusion surface factor theoretical model
convective mass transfer
environmental factor
