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06303 Thirty-three Year Study of Steel Pilings in Seawater

Product Number: 51300-06303-SG
ISBN: 06303 2006 CP
Author: Ashok Kumar, L. D. Stephenson
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Steel H-pilings are often used for foundation in coastal areas, however data on the long term field performance of pilings with coatings and cathodic protection have not been readily available. The results of a thirty-three year study of steel H-pilings in seawater will be presented. The pilings were installed in two locations: (1) thirty-one sets of 3 rows each at La Costa Island, Florida (average temperature of 24 C), and (2) twenty-five sets of 3 rows each at Buzzards Bay near Cape Cod Canal, Massachusetts (average temperature of 9 C). In each case, the performance of bare mariner steel or bare carbon steel piles was compared with coated piles or cathodically protected piles. The coating systems included vinyl systems, coal-tar epoxies, polyurethanes, polyester glass flake and flame sprayed aluminum or zinc. The cathodic protection systems included sacrificial zinc anodes and aluminum anodes. Pilings at La Costa Island were removed after 33 years of study. The pilings showed evidence of biofouling with marine organisms and had to be sandblasted to conduct final flange thickness measurements. Sacrificial anodes were efficacious for the immersed zone and tidal zone at both LaCosta and At Buzzard’s Bay. Coal-tar epoxy coatings and polyester glass flake coatings were top performers in the tidal zone and atmospheric zones. A strategy for dealing with corrosion of maritime structures is presented in the form of a flow chart, along with a risk-based analysis tool that may be applied to any scale of management, from that of a single pile to the management of a large portfolio of berths, maritime structures, and other assets.
Steel H-pilings are often used for foundation in coastal areas, however data on the long term field performance of pilings with coatings and cathodic protection have not been readily available. The results of a thirty-three year study of steel H-pilings in seawater will be presented. The pilings were installed in two locations: (1) thirty-one sets of 3 rows each at La Costa Island, Florida (average temperature of 24 C), and (2) twenty-five sets of 3 rows each at Buzzards Bay near Cape Cod Canal, Massachusetts (average temperature of 9 C). In each case, the performance of bare mariner steel or bare carbon steel piles was compared with coated piles or cathodically protected piles. The coating systems included vinyl systems, coal-tar epoxies, polyurethanes, polyester glass flake and flame sprayed aluminum or zinc. The cathodic protection systems included sacrificial zinc anodes and aluminum anodes. Pilings at La Costa Island were removed after 33 years of study. The pilings showed evidence of biofouling with marine organisms and had to be sandblasted to conduct final flange thickness measurements. Sacrificial anodes were efficacious for the immersed zone and tidal zone at both LaCosta and At Buzzard’s Bay. Coal-tar epoxy coatings and polyester glass flake coatings were top performers in the tidal zone and atmospheric zones. A strategy for dealing with corrosion of maritime structures is presented in the form of a flow chart, along with a risk-based analysis tool that may be applied to any scale of management, from that of a single pile to the management of a large portfolio of berths, maritime structures, and other assets.
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