预应力混凝土结构的氯离子二维扩散理论  

Two-dimensional chloride ion diffusion theory for prestressed concrete structure

作　　者：刘荣桂[1] 陈妤[1] 曹大富[2] 

机构地区：[1]江苏大学理学院,江苏镇江212013 [2]扬州大学建筑科学学院,江苏扬州225009

出　　处：《江苏大学学报（自然科学版）》2009年第1期86-89,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50478089)

摘　　要：针对无限大的扩散介质,以综合考虑氯离子结合能力、氯离子扩散系数的时间依赖性和环境温湿度影响的实际预应力混凝土氯离子方程为基础,分别在常数和幂函数边界条件下,推导出二维氯离子扩散理论的齐次模型.同时根据常数边界条件,模拟氯离子在二维的扩散行为,满足实际的边界条件,模拟值与试验值吻合良好.通过试验发现氯离子扩散在相邻两个表面非稳步同时进行的特点,并且分别探讨了水胶比与应力水平对预应力混凝土结构氯离子扩散的影响.Assuming infinite diffusion medium, based on the diffusion equation for prestressed concrete structure, and accounting for the effects of concrete chloride binding capacity, time dependence of diffusion coefficients, temperature and moisture, models of chloride diffusion in two-dimensional infinite body with both power function and constant homogeneous boundary conditions were formulated. For constant homogeneous boundary, two-dimensional chloride diffusion was simulated, which proved to be in good agreement with the experimental results. The characteristic of non-stability and non-simultaneity for two-dimensional diffusion was discovered and the effects of both water-cement ratio and stress to chloride diffusion of prestressed concrete structure were discussed.

关 键 词：预应力混凝土结构 氯离子侵蚀 数值模拟 有限元 二维扩散 

分 类 号：TU528[建筑科学—建筑技术科学]