Probability Distribution of Chloride Ion Concentration on Surface of Reinforcing Bar Based on Random Meso-Aggregate

Abstract

Abstract: Chloride ion erosion is one of the main factors leading to the durability failure of reinforced concrete (RC) structures. Thus, the study of the probability distribution of chloride ion concentration on the surface of reinforcing bar is of great significance to predict the service performance of marine engineering. By introducing the interface transition zone (ITZ) of random thickness, a concrete meso-model including aggregate, ITZ and mortar was established. Based on the theory of chloride ion diffusion, a meso-numerical model of chloride ion diffusion was established. The results show that the aggregate hinders the chloride ion diffusion and increases the chloride ion diffusion path. According to the statistical analysis of the chloride ion concentration on the surface of reinforcing bar surface by simulated 6 000 groups chloride ion diffusion, when the volume fraction of aggregate ratio is 40%, the chloride ion concentration on the reinforcing bar surface has a bimodal distribution and when aggregate ratio is lower than 40%, the chloride ion concentration on the reinforcing bar surface has a normal distribution. With the increase of aggregate ratio, the chloride iron concentration decreases and the coefficient of variation increases.

Key words: reinforced concrete, chloride ion erosion, numerical simulation, probability distribution, meso-concrete, interface transition zone

CLC Number:

TU528

CHEN Xuandong, RONG Hua, LIANG Miaomeng, YU Aiping, MING Yang. Probability Distribution of Chloride Ion Concentration on Surface of Reinforcing Bar Based on Random Meso-Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3593-3600.

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