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51312-01728-Chloride Threshold Dependence on Potential in Reinforced Mortar

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Product Number: 51312-01728-SG
ISBN: 01728 2012 CP
Author: Andrea N. Sanchez
Publication Date: 2012
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A set of eight concrete slabs with an embedded steel rebar were exposed to a ponding regime under potentiostatic control. Two of the specimens were exposed at open circuit potential and three sets of duplicates were cathodically polarized at -200 -400 and -600 mV (SCE) respectively. Once corrosion starts the specimens were demolished and the chloride content at the rebar surface was determined and reported as the chloride threshold (CT) for that condition. The results are quantified as a parameter that describes the decade increase in CT per mV decrease in potential. The objective of this project is to provide additional assessment of the chloride threshold dependence on steel potential due to the fact that previous work data was only established for limited set of conditions. Preliminary tests provided useful results for part of the test specimen group tentatively confirming that for potentials more negative than -200 mV (SCE) the chloride threshold was greater as manifested by an increase in the time of initiation. The experimental findings are being supplemented by an updated survey of the recent literature data on chloride threshold dependence on steel potential.
A set of eight concrete slabs with an embedded steel rebar were exposed to a ponding regime under potentiostatic control. Two of the specimens were exposed at open circuit potential and three sets of duplicates were cathodically polarized at -200 -400 and -600 mV (SCE) respectively. Once corrosion starts the specimens were demolished and the chloride content at the rebar surface was determined and reported as the chloride threshold (CT) for that condition. The results are quantified as a parameter that describes the decade increase in CT per mV decrease in potential. The objective of this project is to provide additional assessment of the chloride threshold dependence on steel potential due to the fact that previous work data was only established for limited set of conditions. Preliminary tests provided useful results for part of the test specimen group tentatively confirming that for potentials more negative than -200 mV (SCE) the chloride threshold was greater as manifested by an increase in the time of initiation. The experimental findings are being supplemented by an updated survey of the recent literature data on chloride threshold dependence on steel potential.
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