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Targeted Cathodic Protection Jackets for Marine Structures
Jason ChodachekVector Corrosion Technologies
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WHY CP MARINE PILE JACKETS?
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TYPES OF GALVANIC PILE JACKETS?
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WHAT TYPE OF JACKET TO SELECT? Exposure conditions: Saltwater• Tidal• Transitional / Splash• Atmospheric / Dry
Brackish Water• Tidal• Transitional / Splash• Atmospheric / Dry
FreshwaterDryland• Deicing Salts
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Underwater
Tidal Zone / Regular
Splash Zone / Periodic
Typical Pile ExposureAtmospheric Chlorides / Dry
All conditions can be corrosive!
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Exposure Conditions - Zinc Activation
• Zinc is stable at pH 6 to 12.5– Activation increases zinc activity
in concrete• Saltwater activated
– Chlorides are corrosive to zinc• Zinc Mesh Jackets• Zinc Wicking Jackets
• Alkali activated – High pH mortar (14+) is corrosive
to zinc• Alkali Activated Anodes
Concrete
Alkali-Activated
What does exposure conditions haveto do with jacket effectiveness?
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Zinc Mesh Jacket
• Tidal zone protection– Zinc mesh anode – Open bottomed FRP Jacket– Allows saltwater inside
Bulk Anode for underwater protection
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Zinc Mesh Jacket
Low Tide
High Tide
Wet Zone
Dry Zone
Saltwater enters open bottom of form and saturates the zinc mesh inside the jacket.
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Zinc Mesh Jacket
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Zinc Fabric / Wicking Jacket
• Tidal / Splash zone protection – Zinc Anodes wrapped in
wicking fabric– Open bottomed Jacket– Saltwater wicks upward– Modular Forms
Optional Bulk Anode for underwater protection
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Wicking Anode Jacket
Low Tide
High Tide
Wet Zone
Dry Zone
Saltwater enters open bottom of form and saturates the wicking anode.
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Wicking Anode Jacket
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Alkali ActivatedAnode Jacket
• Saltwater NOT required!– Alkali Activated Anodes used
to protect piles and columns in:
• Saltwater • Brackish water• Fresh water and• Dry land applications.
Use appropriate bulk anode for underwater protection when required.
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Alkali Activate Anode Jacket
Low Tide
High Tide
Wet Zone
NO Saltwater enters bottom.
Dry Zone
High Alkaline Mortar keepsZinc Anodes Activated
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Alkali Activate Anode JacketFlorida Keys Column Encasement
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Alkali Activate Anode JacketFlorida DOT – Dry / Atmospheric Exposure Condition
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Jacket Comparison – Performance Areas
MESH WICKING ALKALI
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Stay-in-Place Forms - Options
2 Piece Forms Modular
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Preformed 1 or 2 Piece
Stay-in-Place Forms2 Piece – FRP Clam Shell
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Stay-in-Place Forms - Modular
Modular Jacket Panel
“Jacket in a Box”
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Galvanic Jacket System OverviewModels and Recommended Use
HOW TO PICK THE CORRECT
PILE JACKET?
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Galvanic Jacket System OverviewModels and Recommended Use
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Jason ChodachekVector Corrosion Technologies