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A current state-of-the-art survey is presented with regard to painting of highway structural steel. A thorough literature review was conducted and an inspection and evaluation made of more than 4,000 paint exposure tests. Paint film thickness measurement studies were made. Specific recommendations are given for selecting typical paint systems on the basis of six environmental zones, which represent the range of severity of environment in which highway steel structures are located in the United States. Model specifications are suggested for surface preparation, application, material procurement, and paint system.
Cities and counties in Iowa have more than 8,890 steel bridges, most of which are painted with red lead paint. The Iowa Department of Transportation (Iowa DOT) maintains less than 35 bridges coated with red lead paint, including seven of the large border bridges over the Mississippi and Missouri Rivers. Because of the federal and state regulations for bridge painting, many governmental agencies have opted not to repaint, or otherwise maintain, lead paint coatings. Consequently, the paint condition on many of these bridges is poor, and some bridges are experiencing severe rusting of structural members. This research project was developed with two objectives: 1) to evaluate the effectiveness of preparing the structural steel surface of a bridge with high pressure water jetting instead of abrasive blasting and 2) to coat the structural steel surface with a moisture-cured polyurethane paint under different surface preparation conditions.
Highway engineers have for years been faced with the problem of selecting suitable materials and methods for painting steel bridge members. The need for documented evidence of performance under known conditions (vs) opinions and advertising claims is becoming increasingly important in view of rising labor and material costs, new developments in steel products and coatings, emphasis on safety and aesthetic considerations and the large number of structural steel members requiring protection, both in bridges and other appurtenances that are being incorporated into Interstate and other multi-lane highway facilities. In view of the needs and requirements for painting steel bridge members, this literature survey covers preferred paint systems including surface preparation, pretreatment, application methods, environmental exposure conditions, costs and economics, inspections and will be of value to highway administrators and engineers.