Corrosion Characteristics and Corrosion Current Distribution of Steel Bar in Carbonated Concrete

Yong Sheng Ji; Jian Li Shen; Lei Wang; Cong Yu Xu

doi:10.4028/www.scientific.net/AMR.239-242.3371

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 239-242Corrosion Characteristics and Corrosion Current...

Corrosion Characteristics and Corrosion Current Distribution of Steel Bar in Carbonated Concrete

Abstract:

The corrosion characteristics of steel bar in concrete are decided by the corrosion current distribution along the circumference of the steel bar. It is a general assumption that carbonation lead to a general corrosion on the rebar. However, the destruction of a large number of specimens indicated that before corrosion cracking, the carbonation-induced corrosion mainly distributes on the surface of the steel bar facing the concrete cover. This paper examined the corrosion mechanism from fundamental electrochemical principles and experimental verification. It was illustrated that the macrocell corrosion must co-exist with microcell corrosion, both macrocell and microcell corrosion mechanisms could play significant roles, and the total corrosion could be underestimated if each of two is overlooked.

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Periodical:

Advanced Materials Research (Volumes 239-242)

Pages:

3371-3376

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.3371

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Online since:

May 2011

Authors:

Yong Sheng Ji, Jian Li Shen, Lei Wang, Cong Yu Xu

Keywords:

Carbonation, Corrosion Kinetics, Macrocell, Microcell, Steel Corrosion Characteristics

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