Location

University of Jinan, Jinan City, Shandong, China

Event Website

http://icdcs2022.ujn.edu.cn/index.htm

Keywords

end effect; electrifying corrosion; electromagnetic numerical simulation; cathode; corrosion medium

Abstract

Corrosion of steel bars is the main durability problem of concrete structures, which seriously endangers the safety and service life of reinforced concrete (RC) structures. When studying such problems, the electrifying corrosion method is often used to obtain corroded components. How to effectively control the corrosion area of steel bars is the key to improve the applicability of the corrosion method. In this paper, experimental and electromagnetic numerical simulation methods are used to study the influence of cathode and corrosion medium coverage area along the longitudinal direction on the corrosion area of steel bar before concrete protective layer corrosion cracking. The results show that the numerical simulation method based on electromagnetism can be used to predict the corrosion area of reinforcement before concrete corrosion cracking. When the resistivity of corrosive medium is much lower than that of concrete, the wider the coverage area, the longer the corrosion area of reinforcement along longitudinal direction, the more prone the end effect is, and the change of cathode length has no obvious effect on the corrosion area of reinforcement along longitudinal direction when the corrosion medium coverage area is constant. Increasing the distance between the end of the corrosion medium coverage area and the end of the reinforcement can effectively avoid the end effect.

Share

COinS
 

End effect of corroded steel bar in concrete specimen during corrosion test by galvanostatic method

University of Jinan, Jinan City, Shandong, China

Corrosion of steel bars is the main durability problem of concrete structures, which seriously endangers the safety and service life of reinforced concrete (RC) structures. When studying such problems, the electrifying corrosion method is often used to obtain corroded components. How to effectively control the corrosion area of steel bars is the key to improve the applicability of the corrosion method. In this paper, experimental and electromagnetic numerical simulation methods are used to study the influence of cathode and corrosion medium coverage area along the longitudinal direction on the corrosion area of steel bar before concrete protective layer corrosion cracking. The results show that the numerical simulation method based on electromagnetism can be used to predict the corrosion area of reinforcement before concrete corrosion cracking. When the resistivity of corrosive medium is much lower than that of concrete, the wider the coverage area, the longer the corrosion area of reinforcement along longitudinal direction, the more prone the end effect is, and the change of cathode length has no obvious effect on the corrosion area of reinforcement along longitudinal direction when the corrosion medium coverage area is constant. Increasing the distance between the end of the corrosion medium coverage area and the end of the reinforcement can effectively avoid the end effect.

https://docs.lib.purdue.edu/icdcs/2022/partiii/4