Corrosion prediction models for steel bars in chloride-contaminated concrete: a review
Jin Xia, Jian Shen, Li Tian, Weiliang Jin
Abstract
Concern has been expressed in the recent decades about the corrosion prediction of concrete structures in a chloride environment. This paper summarises the corrosion prediction models developed for chloride-contaminated concrete, including both the empirical and electrochemical corrosion models. The definition methods of the steel de-passivation process for electrochemical models, such as anode–cathode ratio (A a /A c ), critical chloride concentration (C Cl,crit ), modification of anodic Tafel slope (β a ) or passive film resistance (R f ), are considered essential and discussed in detail. Furthermore, electrochemical parameters regarding the definition and selection in electrochemical models and experimental measurements are discussed. This study confirms that A a /A c and C Cl,crit have been generally used in recent years, and that the modifications of β a and R f related to free chloride concentration are technically feasible. In addition, the discreteness of electrochemical parameters in electrochemical models and experimental measurements are observed, and time-dependent characteristics of electrochemical parameters are scarcely presented in the existing literature.