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The Florida Department of Transportation (FDOT) spends over $50 million in steel bridge fabrication and shop painting annually. According to a recent Federal Highway Administration (FHWA) sponsored study by Appleman, approximately 7% of the cost of a steel bridge is budgeted for blast cleaning and primer application in most shops. FDOT knows that proper surface preparation and primer application are the best ways to assure long-term corrosion protection.
The Florida Department of Transportation (FDOT) spends over $50 million in steel bridge fabrication and shop painting annually. According to a recent Federal Highway Administration (FHWA) sponsored study by Appleman, approximately 7% of the cost of a steel bridge is budgeted for blast cleaning and primer application in most shops. FDOT knows that proper surface preparation and primer application are the best ways to assure long-term corrosion protection. To that end, FDOT has created a system whereby shops are qualified in accordance with the American Institute of Steel Construction (AISC) Shop Certification Program (SCP), and its fabricators are required to have the coveted designation as SSPC: The Society for Protective Coatings (SSPC) Painting Contractor Certification Programs (PCCP) Quality Procedure Three (SSPC-QP 3) Certification or the AISC Sophisticated Paint Endorsement (SPE). Only coating systems which have passed through the National Transportation Product Evaluation Program (NETPEP) testing protocol and met the FDOT criteria are specified.
The purpose of this study was to determine the actual service life of some commonly used bridge coating systems. A study authored by Gordon H. Brevoort and updated by KTA-Tator, Inc. in 1996 (1) provided a table of projected service life based largely on a survey of coating manufacturers. Are industry wide predictions of coating life accurate?
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Over 30 percent of the 607,000 bridges in the FHWA National Bridge Inventory have steel superstructures. Most of those are protected from corrosion damage by thin film coatings or paints. Those coatings have a finite life in relation to the steel they protect. Over time, they degrade, eventually requiring repair or replacement. When selecting this type of superstructure for a bridge, the operating agency incurs an obligation to maintain the coating on the steel to protect it from corrosion to obtain its full service life.
This paper describes a bridge coating operation and maintenance manual that was developed for the City of Vancouver which operates and maintains an inventory of 33 bridges with coated steel elements.