A study of steel bar reinforcement corrosion in concretes with SF and SRH using electrochemical impedance spectroscopy

Materials Research

Fernanda Giannotti Da Silva²  Jefferson Benedicto Libardi Liborio¹ 

[1] ,University of São Paulo Department of Materials Engineering and Science São Carlos SP ,Brazil

关键词: high-performance concrete;    silica fume;    corrosion;    eletrochemical techniques;   

DOI  :  10.1590/S1516-14392006000200018

来源: SciELO

【 摘 要 】

Several electrochemical techniques can be used to monitor corrosion, among them are open circuit potential (OCP) and eletrochemical impedance spectroscopy (EIS). Monitoring OCP is the most typical procedure for routine inspection of reinforced concrete structures and can be easily carried out, however it only gives an approximate idea of the corrosion process. EIS is a more complete technique, which supplies information regarding the mechanism and kinetics of reaction electrochemistries, but only used in the laboratory. Based on these two techniques, this study is related to the steel corrosion in high-performance concrete with silica fume and silica from rice husk. The acceleration of the corrosion was carried out using immersion cycles in a 3.5% NaCl solution. As well as high compressive strength values, the addition of silica fume presented low corrosion risks and high impedance module values and significant increases of the concrete resistivity after 22 months of alternate immersion/drying cycles were obtained.

【 授权许可】

CC BY   
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