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51314-4479-Temperature Effects on a Galvanic Anode - Steel in Concrete System

Picture for Temperature Effects on a Galvanic Anode - Steel in Concrete System
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Product Number: 51314-4479-SG
ISBN: 4479 2014 CP
Author: Margareth Dugarte
Publication Date: 2014
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TEMPERATURE EFFECTS ON A GALVANIC ANODE - STEEL IN CONCRETE SYSTEMM. Dugarte A.A. SagüésDepartment of Civil and Environmental Engineering Universidad del Norte km 5 Via Puerto Colombia Barranquilla Colombia.Department of Civil and Environmental Engineering University of South Florida 4202 East Fowler Ave. Tampa FL 33620 U.S.A.Temperature changes affect current delivery and electrochemical assessment of galvanic anode - steel in concrete systems. Interfacial corrosion processes are thermally activated and hence temperature dependent. In addition concrete resistivity varies with temperature with consequent change in any resistive polarization component that may be present. These effects have been recognized in the literature and incorporated in empirical correction factors. The present work aims to extend understanding of this issue. Electrode potentials and resistivity measurements were determined as a function of ambient and concrete temperature in outdoors reinforced concrete slabs where sacrificial point anodes were embedded to deliver protective current to the steel. An apparent activation energy HA was obtained which reflected the combined effect of all factors present and allowed for temperature-compensation of the electrode potential and concrete resistivity measurements. The results as well as those from previous investigations were examined to separate the influence of individual components and toward improving temperature-correction approaches. 
TEMPERATURE EFFECTS ON A GALVANIC ANODE - STEEL IN CONCRETE SYSTEMM. Dugarte A.A. SagüésDepartment of Civil and Environmental Engineering Universidad del Norte km 5 Via Puerto Colombia Barranquilla Colombia.Department of Civil and Environmental Engineering University of South Florida 4202 East Fowler Ave. Tampa FL 33620 U.S.A.Temperature changes affect current delivery and electrochemical assessment of galvanic anode - steel in concrete systems. Interfacial corrosion processes are thermally activated and hence temperature dependent. In addition concrete resistivity varies with temperature with consequent change in any resistive polarization component that may be present. These effects have been recognized in the literature and incorporated in empirical correction factors. The present work aims to extend understanding of this issue. Electrode potentials and resistivity measurements were determined as a function of ambient and concrete temperature in outdoors reinforced concrete slabs where sacrificial point anodes were embedded to deliver protective current to the steel. An apparent activation energy HA was obtained which reflected the combined effect of all factors present and allowed for temperature-compensation of the electrode potential and concrete resistivity measurements. The results as well as those from previous investigations were examined to separate the influence of individual components and toward improving temperature-correction approaches. 
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