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Meso Numerical Simulation of Chloride Ion Diffusion in Concrete Based on Stochastic Convex Polygon Coarse Aggregate Model

Author(s): Yuanzhan Wang; Zhehui Zhou; Zhen Liu; Duo Wang

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Keywords: Concrete; Chloride ion diffusion; Meso numerical model; Interpolation sorting algorithm

Abstract: In the marine environment, the corrosion of steel in the reinforced concrete (RC) structure caused by chloride ion diffusion is one of the most significant factors affecting the durability of RC structures. Using physical model experiment method to explore the natural diffusion of chloride ion in concrete not only needs a lot of manpower, material resources, financial resources and time, but also is difficult to carry out long-term experimental research. Numerical simulation method is an efficient method to save a lot of physical experiment costs. In this paper, the concrete is regarded as a three-phase composite material composed of cement mortar, coarse aggregate and interfacial transition zone (ITZ) and a meso numerical model of chloride ion diffusion in concrete is established. Compared with the widely used extended convex algorithm, a more computationally efficient method, namely interpolation sorting algorithm, is proposed. This method can consider the influence of ITZ and generate convex polygon coarse aggregate randomly. The accuracy and reliability of the numerical model are verified by physical test, and the effect of coarse aggregate volume fraction on chloride ion diffusion was studied.


Year: 2020

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