Preparation and Electrochemical Characterization of Concrete Containing Microencapsulated Calcium Nitrate Corrosion Inhibitor

We present the preparation and inhibition behavior of rebar in the presence of calcium nitrate (CN)-containing microcapsules with concentrations of 0.50, 2.00, and 5.00 wt.% in concrete. From both open circuit potential (OCP) and electrochemical impedance spectroscopy spectra, it was found that an a...

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Bibliographic Details
Published in:MATEC web of conferences 2019, Vol.271, p.7009
Main Authors: Kim, Changkyu, Goldsberry, Reece, Karayan, Ahmad Ivan, Milla, Jose, Hassan, Marwa, Castaneda, Homero
Format: Article
Language:English
Subjects:
Beams (structural)
Calcium nitrate
Concrete
Corrosion
Corrosion inhibitors
Electrochemical analysis
Electrochemical impedance spectroscopy
Open circuit voltage
Passivity
Rebar
Reinforcing steels
Repair & maintenance
Repassivation
Spectrum analysis
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Summary:We present the preparation and inhibition behavior of rebar in the presence of calcium nitrate (CN)-containing microcapsules with concentrations of 0.50, 2.00, and 5.00 wt.% in concrete. From both open circuit potential (OCP) and electrochemical impedance spectroscopy spectra, it was found that an addition of microcapsules containing CN corrosion inhibitor into concrete beams successfully repassivated or maintained the passivity of the rebar when the concrete was cracked. This corrosion inhibitor repassivated the rebar by forming a passive layer on the rebar surface under the crack. This repassivation process was evident by an increase of OCP values to more positive values or by stable OCP values at around -100 mV vs SCE. An increase in phase angle after corrosion activation for the sample with 2.00 wt.% microcapsule clearly showed this repassivation process. The optimum concentration for maintaining the passivity on rebar in the cracked concrete was found to be 5.00 wt.%.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201927107009