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A two-year FHWA in-house study was launched in November 2006 to evaluate various coating materials that can be applied as one-coat systems to steel bridges. A total of eight test materials plus a 3-coat system and a 2-coat control system were applied over near-white steel test panels (SSPC-SP10). Their performance is being monitored using electrochemical impedance spectroscopy, various surface failures, rust creepage at scribe, adhesion, and change of color and gloss.
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The effects of three blasting methods utilised for surface preparation upon the behavior of five organic coating systems are investigated. The blasting methods include dry blast cleaning, UHP and UHPAB. It is shown that pull-off strength, pull-off failure mode, and delamination are significantly affected by the surface preparation method.
Waterborne polyurethane coatings have been used in the bridge preservation market for years as an alternative to solvent borne systems but early technologies required the bridge coatings engineer to compromise on properties or durability. Additionally, many of these early products still contained high levels of VOC although touted as waterborne technology. New alternatives have evolved that address these issues and fit well into an overall sustainability plan.
This paper presents an overview of systems available in the market today, their health and safety characteristics, performance capabilities and delivery mechanisms. Installation technologies are analyzed on their energy efficiencies, environmental impact, performance result consistency, ease of use and cost. The goal was to identify currently available systems; analyze concerns and limitations with these systems; and provide a basis for material selection and installation practices to achieve long-term expectations; while maintaining the utmost protection of humans, animals and the environment
Rapid return-to-service, improved coating durability, and environmental concerns are major driving forces in today’s coating landscape. Coatings that are easier to handle, dry-faster, and last longer provide benefits that speed operation efficiencies and improve overall costs. Ambientcured coatings available today, that offer fast cure and weatherability, include polyurethanes, polyaspartics, waterborne acrylics, and polysiloxanes.
This paper will explore High-Performance Concrete Floor Coatings. It will include the basic characteristics of concrete as a floor substrate. We will examine the importance of preliminary inspection and surface preparation. We will discuss the basic generic types of coatings available and the selection of the appropriate system. We will conclude with an overview of the proper application of the coatings.
Cost effective and optimum pigment dispersion is the most important aspect of color and appearance of coatings. Brilliant hues and high chroma are achieved by a perfect pigment dispersion where primary pigment particles are achieved and are well stabilized in the finished paint. The dispersion process is very critical, very time consuming and cost-intensive, and consists of continuous reduction of the pigment agglomerates into smaller size aggregates, and finally into primary particles.
This presentation will outline the results and conclusions of a number of years of testing and experience in surface preparation for high-performance coatings. Testing has shown that there are a number of important surface preparation variables that are not routinely monitored and controlled on coating projects. These variables will be identified and guidance will be provided on appropriate treatment to achieve coating results.
There are many approaches for rehabilitating deteriorated concrete. The options challenge applicators, estimators, and engineers when executing rehab projects. Selecting the cost-effective approach requires understanding the concrete condition, available coating systems, and level of effort to repair and coat the concrete. A well written specification balances a level of detail that conveys the specifier’s intent with opportunities for contractor innovation to provide facility owners with the best value.
The choice of technologies is influenced by factors such as material cost, labor cost, regulatory conditions, surface preparation requirements, application conditions, time available for work, environmental exposure, warranties and expected lifetime of the coating. Older technologies such as alkyds may still perform adequately in some applications.
The tank painting process for the interior of a petroleum and/or water storage tank requires proper coating selection, product application and inspection in order to achieve long-term service life. The primary cause of early coating failures in a painting project is often related to an application issue. The use of coating systems and linings formulated with Optically Active Pigments (OAP) can help to ensure correct application and inspection of the tank linings.
The Federal Highway Administration, through its Innovative Bridge Research and Construction Program, requested research in the performance of paint coatings applied to bridges. The Maryland State Highway Administration tested two different, two ─ coat systems in a side-by-side comparison with its standard three ─ coat paint system consisting of organic zinc primer / epoxy polyamide intermediate / aliphatic urethane finish coat (currently the “State of the Art” system for most States).