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Nanoparticles are being considered in the development of durable coating systems due to their beneficial electrical and mechanical properties. The present study aims to investigate the corrosion performance of a nanoparticle enriched zinc rich primer (NPE-ZRP) for structural steel in aggressive marine exposure.
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Financial resources for maintenance of coatings systems for owners of steel bridges are at a premium. Therefore, it is imperative to prioritize and choose the scope of services for maintenance painting of these structures in the most efficient manner. This paper will present the fundamental steps necessary for a detailed condition assessment of the existing coatings of steel bridges.
The FHWA 100-year coating study was initiated in August 2009. The objective of this study is to identify and evaluate coating materials that can provide 100 years of maintenance-free service life for steel bridges.
A two-year FHWA one-coat study was launched in November 2006 to evaluate various commercially available coating materials that can be applied as one-coat systems to new steel bridges. Seven one-coat systems, a 3-coat and a 2-coat control were selected and tested in three outdoor environments.
Bridge coatings have evolved significantly over the years, which has led to wide array of coating types for the bridge coatings community to choose from. This paper will briefly discuss the evolution of bridge coatings through time and will also discuss the most current systems deployed in the coating of structural steel bridges. The primary focus of this paper will be centered on one of the newer technologies available, polysiloxane.
Many bridge painting projects include steel repairs as part of the contract. Painting and steel repairs are performed by separate trades and often separate contractors. Even designers may see them as separate activities. However, steel repairs and coatings must work together and be installed as a system to perform as intended. This paper is a discussion about the process of installing steel repairs and painting a bridge at the same time.
The nuts of galvanized fasteners used on bridges are coated with a wax-based lubricant that contains a dye. Once installed, the fasteners are cleaned to remove the wax prior to painting. Cleaning is typically accomplished using a combination of solvents and hand tools, but questions are often raised as to how much residual dye on the surface is acceptable for painting.
Shop metallizing of weathering steel bridge girders for New Jersey Department of Transportation #24.08 Amtrak Bridge. Problems associated with metallizing weathering steel and practical solutions that resulted completing the project as specified.
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.
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.
A two-year Federal Highway Administration (FHWA) in-house study was launched in November 2006 to evaluate various coating materials that may be applied as one-coat systems to steel bridges. A total of eight test materials plus two control systems, a 3-coat and a 2-coat, were applied over near-white steel test panels (SSPC-SP10). Their performance has been evaluated for 20 months using electrochemical impedance spectroscopy, surface failure characterizations, rust creepage at scribe, pull-off adhesion, and changes of color and gloss.
Although bridge construction extends back thousands of years, steel bridge painting is in its infancy. The first iron bridge was built in 1779, and the first steel was used in a bridge in 1828. Coated bridges from the 19th century survive, raising the question, “Can coatings protect steel bridges for the next hundred years?” The author discusses how to achieve 100 years of service life using current materials and offers recommendations for improving steel bridge painting.