10127 Rehabilitation of Historical Bridge Exhibiting Severe Corrosion Damage in Florida

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Product Number: 51300-10127-SG

ISBN: 10127 2010 CP

Author: Richard J. Kessler, Ivan R. Lasa, Mario A. Paredes

Publication Date: 2010

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The “Bridge of Lions” is a National Historic Landmark located in St. Augustine, Florida (the oldest continuously occupied European city in the U.S.). The bridge was built in the 1920's and uses a combination of structural steel and steel reinforced concrete to provide an arch type substructure with a Mediterranean styled deck. During its 80 plus years of service, the aggressive marine environment at the location has promoted severe corrosion induced damage throughout all its components. The most affected portions of the bridge are the structural steel girders and the substructure components in direct contact with the water.

In 2004, the Florida Department of Transportation awarded a contract to rehabilitate the bridge. The contract included among others: replacement of some bridge elements, impressed current cathodic protection on selected reinforced concrete elements that could not be replaced, and thermally applied zinc on steel girders and structural steel attachments. It is anticipated that the restoration work will be completed in 2010, but the corrosion control methods will be operational upon installation to avoid the onset of corrosion during the construction period.

This paper discusses the design and installation of the corrosion control measures as well as their initial performance.

KEYWORDS: bridge, cathodic protection, concrete, corrosion, E log I testing, metalizing, metallic coating, structural steel, titanium anode, thermal stray coating, zinc