Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 30, Issue -, Pages 516-521Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2011.12.044
Keywords
Chloride salt type; Chloride threshold level; Reinforcement corrosion; Simulated concrete pore solution
Categories
Funding
- Natural Science Foundation of China [50978085]
- Six Talent Peak Project (class A) of Jiangsu Province
- Fundamental Research Funds for the Central Universities [2009B15214]
- China Postdoctoral Science Foundation [20100481082, 201104544]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1002019B]
- Shenzhou Durability Center for Civil Engineering, Shenzhou University [SZDCCE11-03]
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The objective of this study is to examine the influence of chloride salt type on the threshold level for the corrosion of steel reinforcement in concrete. The experiment was carried out in two kinds of simulated concrete pore solutions, i.e. saturated Ca(OH)(2) solution and cement extract. KCl, NaCl, CaCl2 and MgCl2 were chosen as the sources of chloride to corrode the steel reinforcement. The initiation of pitting corrosion was detected by combining of the open-circuit potential (E-corr) with corrosion current density (I-corr), which was measured by electrochemical impedance spectroscopy (EIS). It has been found that the threshold level for the chloride salts with a same valent cation is identical in two solutions. However, the threshold level is changed with the cation valence of chloride salts, and the actual effect depends on the solutions. (C) 2011 Elsevier Ltd. All rights reserved.
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