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Selecting the most appropriate protective coating for the exterior of steel wind towers involves balancing the variables of production and protection to maximize profitability. The coating solution that maximizes production and protection while realizing a profitability that is equal to or greater than owner expectations is an organic zinc-rich epoxy primer and polyaspartic urethane topcoat.
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This paper describes concrete rehabilitation of the primary treatment process at the Fairfield-Suisun Sewer District Treatment Facility. The paper encompasses V&A’s initial concrete condition evaluation, coating specifications, and the warranty coating inspection. Notable items of discussion include coating selection, construction window, flow diversion schemes, and full-time coating inspection.
Life safety is the mantra of National Fire Protection Association (NFPA) 101 which is embraced by all in the fire protection industry. The approach to life safety has disseminated now into steel protection. Hot dipped galvanized members are being used more frequently in commercial buildings which require hourly ratings for fire protection.
This presentation will discuss current accelerated testing methods used to approve coatings used on wind tower foundations, towers and other related equipment. The presenter will discuss global coating standards used for system selection, and the presenter will provide potential system upgrades and efforts to allow for extending coating life expectancy to first major maintenance activity. Additional information on related experiences of other industries in environments such as onshore and offshore will be discussed.
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.
Corrosion and cavitation erosion on steel structures are problems and can have a huge impact on safety and economy. In order to prevent corrosion, protective coatings can be used as a barrier between the steel surface and the corrosive elements such as seawater or various liquid cargos. However, when coating systems fail the surface will be exposed to the environment with all consequences. From that perspective, the weakest link is the coating used to protect the steel.
The California Dept. of Transportation (Caltrans), Standard Green Finish Paint (PWB-172B) was introduced in February 2006 because of changes to Volatile Organic Carbon (VOC) regulations in the South Coast Air Quality Management District (SCAQMD). In 2014, Caltrans decided to update the coating formulation, seeking to provide better performance properties.
The construction of the new One World Trade Center (WTC) in New York includes exposed steel members and bolted splice plates. Accordingly, surface preparation and coating system selection for the bolt/washer/nut assemblies for the bolted connections was critical, since the splice plates would be visible. There was little published information on surface preparation and coating requirements for ASTM A 490 black bolts.
This paper describes the recoating of the interior primary and secondary structural steel of an atmospherically exposed building that houses a solid waste transfer station. The basic chemistry and the benefits of moisture cured polyurethane coatings in cold and humid climates are discussed.
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.
In contrast to the Hipster projected or “posed” image based solely upon appearance in lieu of substance, a company’s brand-image projected by paints & coatings requires performance derived from consistently sound chemistry and manufacturing. The protective paints and coatings on the façade of commercial buildings are a significant aspect of the image associated with the owner organization.
A new acrylic epoxy hybrid (AEH) water based dispersion has been developed for two-components coating applications for several years. This new AEH dispersion can be used to replace the conventional water based epoxy dispersions for concrete and metal coatings. The curing agent selection for the new AEH dispersion is critical for metal applications for both formulation stability and the performance such as corrosion resistance, water resistance and UV durability. This paper discusses the utility of using ζ-potential and water solubility in curing agent selection.