Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 73, Issue -, Pages 214-221Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.09.103
Keywords
Time-dependent dominating factors; Steel rebar corrosion; Corrosion products; Cyclic drying and wetting
Categories
Funding
- National Science Foundation of China [51178455]
- Jiangsu Overseas Research & Training Program for University Prominent Young & Middle aged Teachers and Presidents, Ministry of Housing and Urban-rural Development of the People's Republic of China [2014-k4-015]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- NSFC
- ORTP
- MOHURD
- PAPD
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In this paper we quantified the corrosion rates of active steel in atmospheric environment, cyclic wetting and drying, and active steel and passive steel in saturated concrete. The microstructure of the interfacial transition zone between the corroded bar and the concrete was observed with an Electron Microscope. The time-dependent dominating factors in the rebar corrosion processes under different environmental conditions were explained by the polarization curves. Results indicate that the corrosion current (I-corr) of passive steel in concrete immersed in NaCl solution is low due to low oxygen availability. I-corr of the active steel in saturated concrete reaches the maximum because the corrosion product (FeOOH) on the steel surface acts as new strong cathodic depolarization agent. However, the corrosion process stops after FeOOH in corrosion layer is completely consumed. Furthermore, I-corr of active steel subjected to cyclic wetting and drying remains at a high level because of high concentrations of FeOOH and oxygen. The maximum I-corr corresponds to the area under cyclic wetting and drying. (C) 2014 Elsevier Ltd. All rights reserved.
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