Download PDFOpen PDF in browserPreparation and Electrochemical Characterization of Microcapsules Containing Calcium Nitrate in Self-Healing ConcreteEasyChair Preprint 770, version 25 pages•Date: February 10, 2019AbstractWe present the preparation and inhibition behavior of rebar in the presence of microencapsulated calcium nitrate (CN) with concentrations of 0.5, 2.0, and 5 wt.% in concrete. From both open circuit potential (OCP) and electrochemical impedance spectroscopy spectra, it was found that an addition of CN corrosion inhibitor-containing microcapsules into concrete beams successfully repassivated or maintained the passivity of the rebar when the concrete was cracked. This corrosion inhibitor healed the rebar by forming a passive layer on the rebar surface under the crack. This healing 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 CN C 2% clearly showed this healing process. The optimum concentration for maintaining the passivity on rebar in the cracked concrete was found to be 5 wt.%. Keyphrases: Concrete, Corrosion inhibition, EIS, calcium nitrate, microcapsules
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