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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结构微缺陷影响的实际混凝土氯离子扩散新方程为基础,在常数边界条件下,推导出一维、二维和三维氯离子扩散理论的齐次模型。同时,根据指数函数的边界条件,在理论上导出了一维氯离子扩散理论的非齐次模型,能满足混凝土结构工程的实际边界条件。最后论证了引进氯离子结合能力、氯离子扩散系数的时间依赖性和劣化效应系数等参数对于描述混凝土氯离子扩散行为的必要性,探讨了采用多维扩散理论模型的意义,并通过实验确定了混凝土的指数边界条件函数。结果表明,采用氯离子扩散理论非齐次模型有利于提高混凝土结构耐久性设计的安全性。
Aiming at infinite diffusion medium, based on the new chloride ion diffusion equation of concrete which is affected by the chloride ion binding ability, the time dependence of chloride ion diffusion coefficient and the effect of structural microdefects, under the constant boundary conditions, Homogeneous model of two - dimensional and three - dimensional chloride ion diffusion theory. At the same time, according to the boundary conditions of exponential function, a one-dimensional non-homogeneous model of chloride ion diffusion theory is derived in theory, which can meet the actual boundary conditions of concrete structure engineering. Finally, the necessity of introducing chloride ion binding ability, time dependence of chloride ion diffusion coefficient and coefficient of effect of deterioration to demonstrate the chloride ion diffusion behavior of concrete is demonstrated. The significance of using multidimensional diffusion theory model is discussed. Exponential boundary conditions function. The results show that the use of non-homogeneous chloride ion diffusion model is conducive to improving the durability of concrete structure design safety.