在给定时间内,氯离子在混凝土中的扩散深度是有限的,因而当前基于半无限扩散域的Fick第二定律的解析解存在缺陷。利用等比级数研究建立了氯离子扩散和浓度分布的解析解,建立了氯离子扩散深度的解析表达式,同时也证明了氯离子扩散场计算长度的合理性。算例分析表明,提出的基于有限域的混凝土中氯离子扩散的解析解具有较高的精度,且计算简便。
The diffusion of chloride ion in concrete is limited to a certain distance in a specific period.However,the traditional analytical solu-tion based on the Fick's Second Law is defined in the semi-infinite diffusion domain.The geometric progression is employed to develop the analyt-ical solution of chloride ion diffusion and chloride profile in concrete.The analytical expression is defined for diffusion depth of chloride ion in concrete.The effectiveness of the computing length of chloride diffusion is verified.Examples are given to demonstrate the accuracy and conve-nience of the presented method.