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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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Coating application on the exterior of ocean-going vessels and offshore platforms is normally very time sensitive, and frequently must be performed during times of high humidity, sweating hulls and daily rain showers. This paper will describe the use of solvent free, surface tolerant epoxies that can be applied to wet surfaces during times of very high relative humidity. Both the positive and negative aspects will be covered.
In November 2004 ISO 19840 was published to provide a consistent method for the measurement of coatings applied to structural steel for corrosion prevention. This new standard includes methods for the adjustment of gauges to take account of surface roughness, the designation of inspection areas and the use of acceptance criteria.