Research On Mathematical Model And Numerical Analysis Of Chloride Diffusionin Concrete Structure

The durability of reinforced concrete is one of the written topics in Civil Engineering. The corrosion of the Chloride is one of the most important factor that influence the durability of the concrete. Usually, the way of chloride ions into the concrete mostly include dffusion, permeation, capillary Action. Among them, the diffusion is the main way. Model and Numerical Analysis of Chloride Diffusion in Concrete Structure is discussed in this paper.Firstly, When the chloride ion diffusion coefficient is constant, it can be divided into two types, which are the same diffusion coefficient in the two direction and different diffusion coefficient in two different directions. The establishment of two models are based on ADI format, at the same time, the stability and the convergence of the model are also discussed in this paper. The results show that, the model is unconditionally stable and convergent, In addition, for the treatment of boundary conditions, the finite element model is also discussed in this paper.Secondly, the diffusion coefficient is not actually constant,it is influenced by the surrounding environment. In order to solve this problem,The ADI model of variable coefficient with time is established in this paper, Results show that the model is unconditionally stable.In addition,there will be cracks in concrete,the crack is also a factor that influences the durability of the concrete, Fractal model that can predict the crack was established in this paper. A new method that can determine the compression factor is put forward. It can be found by contrast that this method is effective. It can lay the foundation for the future research.