期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 73, 期 -, 页码 214-221出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.09.103
关键词
Time-dependent dominating factors; Steel rebar corrosion; Corrosion products; Cyclic drying and wetting
资金
- 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
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据