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Distress (controlled surface breaks) was created on production samples of epoxy coated rebar and some were further subject to cathodic disbondment. Samples were cast in concrete and subjected to cyclic polarization and electrochemical impedance spectroscopy measurements.
Corrosion of epoxy coated rebar (ECR) in chloride exposed concrete can be enabled by theoxygen reduction cathodic reaction taking place on steel exposed by coating breaks. The totalcathodic current would be expected to increase if the reaction locus were to extend into crevicesformed at disbonded coating regions around coating breaks. To examine the possible amount ofthis effect distress in the form of controlled surface breaks was created on production samplesof ECR some of which were further subject to cathodic disbondment to create surroundingdisbonded regions around the breaks. The samples were cast in concrete specimens kept at~80% RH in air and fitted with electrodes to perform cyclic polarization (CYP) in the cathodicdirection and electrochemical impedance spectroscopy (EIS) measurements under open circuitconditions. Measurements performed initially and after 6 years of aging showed for thedisbonded specimens a moderately greater extent of cathodic current and greater effectiveelectrode area compared to that of the simply distressed specimens. Results will be presentedas well for experiments in progress where concrete moisture is elevated to increase theelectrolyte content in the disbondment crevice. The implications of the findings on the estimatedservice life of ECR structures will be quantitatively assessed.
Key words: Epoxy-coated reinforcement, cathodic disbondment, electrode area
An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
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A case study of a major CP system operating in Australia for 15 years and proposal of a series of changes to current practices which can be considered for implementation in the design, installation and monitoring stages of new impressed current cathodic protection systems in concrete.
In this paper, a new concept named CP by distributed sacrificial anodes (DSA) is presented. The main principle of CP by DSA is to convert cathode area to anode area by distributing anode mass over the surface of the equipment to be protected.