Abstract
Chloride diffusion-induced corrosion is a major factor that affects the durability of concrete structures. Thus, the study of chloride diffusion in concrete is important. In this study, a mesoscopic structure model is proposed and used to investigate chloride diffusion in concrete. The concrete is assumed to be a heterogeneous material composed of two phases of aggregate and mortar matrix. The aggregates are randomly distributed convex polygons. The chloride diffusion is assumed to occur only in the mortar matrix phase. The modified chloride diffusion coefficient in the mesoscale model is proposed. The effect of a single aggregate in chloride diffusion in concrete is analyzed. The present numerical model is validated on the basis of the experimental data. The influence of aggregate in the presented model, including aggregate random distribution form, aggregate content, and the validity of polygonal aggregate based on circle, is explored further. The simulation results indicate that the polygonal aggregate random distribution has a negligible influence on chloride diffusion in concrete, the polygonal aggregate content has a certain effect, and the presented mesoscale numerical model is an effect method for predicting the chloride diffusion in concrete.
Highlights
IntroductionChloride-induced reinforcement corrosion is a major cause of deterioration in reinforced concrete structures. is corrosion may result in serious damage to concrete structures and increased cost of repair and inspection [1, 2]. erefore, exploring the problem of chloride diffusion in concrete is important
Chloride-induced reinforcement corrosion is a major cause of deterioration in reinforced concrete structures. is corrosion may result in serious damage to concrete structures and increased cost of repair and inspection [1, 2]. erefore, exploring the problem of chloride diffusion in concrete is important.Considerable efforts have been made by using different methods to investigate various models to explain the diffusion behavior of chloride in heterogeneous concrete materials
It is seen that the effect of different sizes and shape aggregates is discriminating. e width of the diffusion path shrinks when the front of the diffusion meets the aggregate. e width of the diffusion path increases, and the rate of diffusion slows down when the front of the diffusion meets the center of the aggregate
Summary
Chloride-induced reinforcement corrosion is a major cause of deterioration in reinforced concrete structures. is corrosion may result in serious damage to concrete structures and increased cost of repair and inspection [1, 2]. erefore, exploring the problem of chloride diffusion in concrete is important. Adopting the real ITZ thickness in the FEM simulated method to study the chloride diffusivity behavior in concrete is difficult because of the limitation of the computation. E present study focuses on the influences of mesostructure parameters on chloride diffusivity in concrete, including aggregate distribution, shape, and content. Taking all these into account, to reveal the particulars of chloride diffusion in a heterostructural concrete, a simple two-phased structure model was constructed and used in this present article.
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