CP Criteria for Reinforced Concrete in Marine Exposure Zones

A marine environment may be characterized by tidal, submerged, and atmospherically exposed zones. Cathodic protection (CP) of reinforced concrete in the submerged zone may induce reducing conditions associated with immunity to corrosion characterized by negative steel potentials. In the atmospheric...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2000-05, Vol.12 (2), p.164-171
Main Authors: Glass, Gareth K, Hassanein, Alaa M, Buenfeld, Nick R
Format: Article
Language:English
Subjects:
Applied sciences
Building structure
Buildings. Public works
Cathodic protection
Chlorides
Civil engineering
Concentration gradient
Concretes
Construction (buildings and works)
Corrosion
Corrosion rate
Criteria
Current density
Decay
Drives
Drying
Durability. Pathology. Repairing. Maintenance
Electric potential
Exact sciences and technology
Exposure
Ions
Marine environments
Offshore structures
Passivity
Reinforced concrete
Reinforced concrete structure
Reinforcing steels
TECHNICAL PAPERS
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Summary:A marine environment may be characterized by tidal, submerged, and atmospherically exposed zones. Cathodic protection (CP) of reinforced concrete in the submerged zone may induce reducing conditions associated with immunity to corrosion characterized by negative steel potentials. In the atmospheric zone CP induces an improvement in the local environment at the steel, promoting steel passivity, which may be monitored using a potential decay criterion in relatively dry conditions. Many protective effects will persist following the interruption of the current, providing a basis for intermittent CP in the tidal zone. However, conventional criteria may not be reliable in this case. The importance of the current-induced improvement in the tidal zone environment provides justification for the use of a protection current density criterion. The integrated current densities required to arrest high initial corrosion rates are relatively low. Protection criteria may also be based on a positive trend in measured potentials indicative of passivating steel and the induced voltage drop through the concrete cover that drives the removal of chloride ions and sustains a high hydroxyl concentration gradient between the steel and the external environment.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)0899-1561(2000)12:2(164)