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Bulk Anode Advancements in Sacrificial Cathodic Protection Jackets

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Zinc Tidal CP jackets have been utilized to protect the splash zone of steel reinforced concrete piles against aggressive corrosion due to seawater exposure since the mid 1990’s. Galvanic CP jackets are installed on piles in the splash zone and provide galvanic current to the jacketed areas (Figure 1). The submerged portion of the pile that extends below the jacket is always exposed to seawater.

Product Number: 51323-19161-SG
Author: Matt Miltenberger, Sameer Telang, Jason Chodachek
Publication Date: 2023
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$20.00
$20.00

Galvanic cathodic protection (CP) jackets for reinforced concrete piling utilize a GFRP or PVC stay-in-place form in the tidal zone and a bulk anode in the constantly submerged zone. The stay-in-place form normally covers spall repairs and contains an anode embedded in the cement mortar. Below the stay-in-place form (Jacket), a bulk anode provides corrosion protection for the length of pile exposed below mean low water. Commonly, these bulk anodes are 48 lb. zinc hull anodes. Since the galvanic corrosion process releases zinc ions into the seawater, many marine biologists, owners and engineers question the environmental impact of introducing zinc ions into the marine environment. This paper evaluates the effectiveness and compatibility of using bulk aluminum anodes as an alternative to the traditional bulk zinc anode. Data on the performance and compatibility of aluminum bulk anodes with two types of tidal cathodic protection jackets will be presented. The aluminum bulk anodes are evaluated for compatibility with galvanic jackets using traditional expanded zinc mesh, and alkali-activated zinc anodes inside the jackets. The result of this trial demonstrates that environmentally friendly aluminum anodes can be used as an alternative to the bulk zinc anodes for marine tidal jacket protection.

Galvanic cathodic protection (CP) jackets for reinforced concrete piling utilize a GFRP or PVC stay-in-place form in the tidal zone and a bulk anode in the constantly submerged zone. The stay-in-place form normally covers spall repairs and contains an anode embedded in the cement mortar. Below the stay-in-place form (Jacket), a bulk anode provides corrosion protection for the length of pile exposed below mean low water. Commonly, these bulk anodes are 48 lb. zinc hull anodes. Since the galvanic corrosion process releases zinc ions into the seawater, many marine biologists, owners and engineers question the environmental impact of introducing zinc ions into the marine environment. This paper evaluates the effectiveness and compatibility of using bulk aluminum anodes as an alternative to the traditional bulk zinc anode. Data on the performance and compatibility of aluminum bulk anodes with two types of tidal cathodic protection jackets will be presented. The aluminum bulk anodes are evaluated for compatibility with galvanic jackets using traditional expanded zinc mesh, and alkali-activated zinc anodes inside the jackets. The result of this trial demonstrates that environmentally friendly aluminum anodes can be used as an alternative to the bulk zinc anodes for marine tidal jacket protection.

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