Electrochemical behavior of steel rebars in concrete with SF and SRH subjected to chloride attack

Author(s): F. G. da Silva, J. B. L. Liborio
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 421 - 430
Total Pages: 10
Language: English

Abstract: 
Several electrochemical techniques can be used to monitor corrosion, among them are open circuit potential (OCP) and electrochemical 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, 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 NaCl solution during 28 months. The parameters obtained from the impedance spectra simulation, including the maximum phase angle shift and polarization resistance, were used to characterize the rebar corrosion. The OCP measurements were confirmed by corrosion rate results and the corrosion protection performance provided by silica fume is better than provided by silica extracted from rice husk.

Keywords: durability, high-performance concrete, silica fume, silica from rice husk, electrochemical techniques.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00