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07287 UTILITY OF SUBMERGED BULK GALVANIC ANODES FOR ABOVE WATERLINE REINFORCED CONCRETE ELEMENTS

Picture for 07287 UTILITY OF SUBMERGED BULK GALVANIC ANODES FOR ABOVE WATERLINE REINFORCED CONCRETE ELEMENTS
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Product Number: 51300-07287-SG
ISBN: 07286 2007 CP
Author: Wei Chu and William Hartt
Publication Date: 2007
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Reinforced concrete bridge substructures in Florida coastal waters have historically experienced deterioration as a consequence of embedded steel corrosion followed by concrete cracking and spalling. Galvanic anode cathodic protection (CP), as affected by thermally sprayed zinc for cast-inplace components and zinc mesh jackets for precast ones, has been employed to control this corrosion and extend useful service life. In either case, the CP systems include a submerged bulk zinc anode (SBA) to reduce current drain from the lower portion of the thermal spray or jacket components. To investigate the extent of any contribution of SBAs in protecting the above-waterline zone, two substructures were instrumented with SBAs only and monitored. In addition, the substructures and SBAs were modeled using Boundary Element Analysis, the results compared with the field measurements, and the utility of cp using SBAs alone projected.
Reinforced concrete bridge substructures in Florida coastal waters have historically experienced deterioration as a consequence of embedded steel corrosion followed by concrete cracking and spalling. Galvanic anode cathodic protection (CP), as affected by thermally sprayed zinc for cast-inplace components and zinc mesh jackets for precast ones, has been employed to control this corrosion and extend useful service life. In either case, the CP systems include a submerged bulk zinc anode (SBA) to reduce current drain from the lower portion of the thermal spray or jacket components. To investigate the extent of any contribution of SBAs in protecting the above-waterline zone, two substructures were instrumented with SBAs only and monitored. In addition, the substructures and SBAs were modeled using Boundary Element Analysis, the results compared with the field measurements, and the utility of cp using SBAs alone projected.
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