Abstract
This paper reports an experimental work to investigate the pit corrosion of steel bars in chloride contaminated concrete. A total of 50 reinforcing steel bars with a length of 250 mm and a diameter of 14 mm were embedded in 10 concrete specimens, before they were subjected to accelerated corrosion. The geometric parameters of the corroded steel bars were then examined using 3D scanning method, before the characteristics of pitting corrosion of the corroded bars were analyzed accordingly. The results show that there is a weak correlation between the maximum pit depth and the mass loss rate. However, there is a strong correlation between the pitting factor and the mass loss rate. The relationship between the pitting factor and the mass loss rate has been developed as a reciprocal function.
Highlights
The corrosion of reinforcing steel is one of the principal causes of the deterioration of reinforced concrete structures, for those exposed to the marine environment
The irregular and uneven distribution of corrosion along the length of a reinforcing steel bar makes it difficult to determine the residual strength of the corroded steel bar more properly [2]
Numerous studies exist in the literature on the corrosion of reinforcing steel bars in concrete to examine the damage evolution of reinforcement and its effect on the load carrying capacity of the reinforced concrete structure [3,4,5,6,7]
Summary
The corrosion of reinforcing steel is one of the principal causes of the deterioration of reinforced concrete structures, for those exposed to the marine environment. Pitting corrosion is usually localized, and it significantly different from the average corrosion and causes the minimum cross section of a reinforcing bar. Based on the obtained data, they determined numerically the maximum pitting depth along the circumferential direction of bar section, the residual cross-sectional area, and the second moments of area of the corroded bars. The probability distribution of the residual cross-sectional area and the second moments of area of corroded bars were settled down via the statistical analysis. They did not present the probability distribution of the pitting depth and its correlation with other geometric parameters of corroded bars. The plain steel bars were adopted in more severely this tests to improve the accuracy of measurement for the defined research aim
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