摘要
分析了海洋环境下氯离子在混凝土中的传输机理及其随机扩散过程.将扩散系数作为随机数,混凝土表面氯离子浓度、保护层厚度作为随机变量,建立混凝土中钢筋表面氯离子浓度分布的随机模型,推导出钢筋表面氯离子浓度的均值和方差.算例结果表明,该模型的计算值较传统的Fick扩散定律更接近试验值,可用于预测海洋环境下混凝土中钢筋表面的氯离子浓度.
The transportation mechanics and stochastic diffusion of chloride ions in concrete in the marine environment are analyzed. A stochastic model of the chloride ion concentration at steel-concrete interfaces is established with the chloride ion concentration at concrete surfaces and the thickness of concrete covers taken as random variables, and the chloride ion diffusion coefficient as a stochastic process. The mean value and variance of the chloride ion concentration at steel-concrete interfaces are obtained. The chloride ion concentration derived by this stochastic model shows better correlation with experimental data than that derived by the conventional Fick's second law. So, the stochastic model can be used to predict the chloride ion concentration at the steel-concrete interface in the marine environment.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期38-41,共4页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金资助项目(50079002)
关键词
海洋环境
混凝土
钢筋
氯离子浓度
浓度扩散
随机模型
marine environment
concrete
steel-concrete interface
chloride ion concentration
concentration diffusion
stochastic model
