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51315-6102-Cathodic Prevention for Reinforcing Steel in Cracked Concrete of Chloride Contaminated Structures

Picture for Cathodic Prevention for Reinforcing Steel in Cracked Concrete of Chloride Contaminated Structures
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Product Number: 51315-6102-SG
ISBN: 6102 2015 CP
Author: Margareth Dugarte
Publication Date: 2015
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Steel in concrete in marine service corrodes because chloride ions penetrating from the outside toward the steel eventually build up there to a critical threshold level CT that causes breakdown of the protective passive film on the steel surface. There is strong motivation and high potential benefit in developing alternative or supplemental corrosion management approaches that will serve to extend the life of new and existing structures while minimizing adverse impact. One technology that holds considerable promise to that end is Cathodic Prevention (CPrev). CPrev is based on the observation that the value of CT increases if the steel is polarized in the cathodic direction while still in the passive condition. This paper presents the findings from an ongoing investigation to determine the effectiveness of cathodic prevention on cracked concrete exposed to a marine environment. Experiments are being conducted on reinforced concrete blocks with controlled-width cracks placed along the length of a central reinforcing steel bar. A ponding area on top of each specimen allows for cyclic exposure to a 5% NaCl solution to imitate a marine environment. Crack widths ranging from 0.01 inch to 0.04 inch and polarization levels ranging from -330 mV to -540 mV (SCE) are used. Results suggest that cathodic prevention with moderate cathodic polarization levels may be of limited benefit in the presence of cracks aligned lengthwise to the rebar independent of the crack width. Testing revealed that polarization at potentials equal to or less negative than -330 mV SCE was insufficient to prevent corrosion initiation in cracks of any tested size (0.01 to 0.04 in wide). Polarization to -430 mV SCE prevented corrosion initiation at cracks up to 0.02 in wide and polarization a -540 mV SCE resulted in no corrosion initiation events for any crack size during the test interval.
Steel in concrete in marine service corrodes because chloride ions penetrating from the outside toward the steel eventually build up there to a critical threshold level CT that causes breakdown of the protective passive film on the steel surface. There is strong motivation and high potential benefit in developing alternative or supplemental corrosion management approaches that will serve to extend the life of new and existing structures while minimizing adverse impact. One technology that holds considerable promise to that end is Cathodic Prevention (CPrev). CPrev is based on the observation that the value of CT increases if the steel is polarized in the cathodic direction while still in the passive condition. This paper presents the findings from an ongoing investigation to determine the effectiveness of cathodic prevention on cracked concrete exposed to a marine environment. Experiments are being conducted on reinforced concrete blocks with controlled-width cracks placed along the length of a central reinforcing steel bar. A ponding area on top of each specimen allows for cyclic exposure to a 5% NaCl solution to imitate a marine environment. Crack widths ranging from 0.01 inch to 0.04 inch and polarization levels ranging from -330 mV to -540 mV (SCE) are used. Results suggest that cathodic prevention with moderate cathodic polarization levels may be of limited benefit in the presence of cracks aligned lengthwise to the rebar independent of the crack width. Testing revealed that polarization at potentials equal to or less negative than -330 mV SCE was insufficient to prevent corrosion initiation in cracks of any tested size (0.01 to 0.04 in wide). Polarization to -430 mV SCE prevented corrosion initiation at cracks up to 0.02 in wide and polarization a -540 mV SCE resulted in no corrosion initiation events for any crack size during the test interval.
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51318-11584-CATHODIC PREVENTION-PROTECTION OF STEEL IN CRACKED CONCRETE

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This work seeks to determine the performance of cathodic prevention (CPrev) and cathodic protection (CP) systems applied to cracked concrete in a simulated marine environment.
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