Corrosion Process of Steel Bar in Concrete in Full Lifetime

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Title: Corrosion Process of Steel Bar in Concrete in Full Lifetime

Author(s): Yingshu Yuan, Jianhua Jiang, and Tao Peng

Publication: Materials Journal

Volume: 107

Issue: 6

Appears on pages(s): 563-568

Keywords: chloride attack; corrosion rate; interfacial transition zone; time variation

DOI: 10.14359/51664042

Date: 11/1/2010

Abstract:
The corrosion current density of steel bar in concrete is measured during a corrosion process under the conditions of constant climate and chloride attack. The corrosion process shows the characteristics of the time-variant corrosion rate, and the four phases in the corrosion process are presented. The effects of the concrete water-cement ratio (w/c) on the variation of corrosion current densities are discussed, which shows that the influences of the variation of the corrosion current density and the cracking time are obvious. The mechanism analyses of the time-variation characteristics are carried out based on the microstructure of the interfacial transition zone (ITZ) between the steel bars and the concrete at different corrosion levels. The growth of the corrosion layer and the corrosion cracking are the main factors influencing the corrosion process. Finally, the time-dependent model of the corrosion rate variation and the corresponding model of the corrosion loss accumulation are presented.


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