Monitoring by electrochemical impedance spectroscopy of mortars subjected to ingress and extraction of chloride ions

•Reinforced mortar was monitored during the ingress and extraction of chloride.•EIS identified the moment of arrival of the chloride ions in the reinforcement region.•EIS identified the depassivation period of the steel.•EIS was able to monitor chloride extraction. Reinforcement corrosion is usually...

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Bibliographic Details
Published in:	Construction & building materials Vol. 242; p. 118001
Main Authors:	Melara, Everton K., Mendes, Adriane Z., Andreczevecz, Natália C., Bragança, Mariana O.G.P., Carrera, Gilberto T., Medeiros-Junior, Ronaldo A.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 10-05-2020
Subjects:	Corrosion Electrochemical properties Extraction of chloride ions Reinforcement Spectroscopy Extraction of chloride ions Reinforcement Spectroscopy Electrochemical properties Corrosion
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Summary:	•Reinforced mortar was monitored during the ingress and extraction of chloride.•EIS identified the moment of arrival of the chloride ions in the reinforcement region.•EIS identified the depassivation period of the steel.•EIS was able to monitor chloride extraction. Reinforcement corrosion is usually detected at advanced ages. Electrochemical analyses have been found to be efficient for the detection of corrosion phenomena at early age. This study sought to evaluate the use of electrochemical impedance spectroscopy (EIS) for the characterization of evidence of corrosion. For this purpose, reinforced mortar specimens were monitored, initially during exposure in a salt fog chamber for 150 days and subsequently during electrochemical chloride extraction. During these steps, complementary tests were performed to explain the results (scanning electron microscopy, chloride depth determination, corrosion potentials and chromatography of chloride ions). The results indicated that the EIS can identify important moments of chloride penetration in cementitious materials, such as the hydration of the material, the arrival of chloride ions in the reinforcement region, the depassivation period of the steel, the beginning of the corrosion process in the rebar and the monitoring of the chloride exit over time.
ISSN:	0950-0618 1879-0526
DOI:	10.1016/j.conbuildmat.2020.118001