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The presentation will describe the frustrations and problems architects experience because of insufficient or non-existent standards governing architectural coating materials and practices. Areas where standards need to be written or upgraded will be named and discussed.
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This paper will discuss various considerations that should be weighed when writing a specification to line a concrete tank, secondary containment or industrial floor.
Many times, concrete coating projects are approached similarly to those of other paintable substrates, like steel or wood. The primary and sometimes only, focus is to provide a visibly clean and sound surface. More experienced design professionals will ensure that voids are filled, protrusions are ground to plane, and the correct surface profile is achieved. Once prepared, a serviceable coating system is applied (always as per the manufacturer’s recommendations) and no one looks back… unless there is a failure.
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.
Epoxy-based coating used in the ships and marine structures can be quickly degraded after only a short period of exterior exposure. The weathering defects such as discoloration, chalking and gloss reduction are originated from a photo-oxidation of aromatic group in the epoxy resin under the UV light. Weather resistance coatings such as polyurethane and polysiloxane require more work due to the short over-coating interval and low compatibility with primer coating layers.
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.
A new era of natural gas exploration is spreading across the continental United States and Canada. Through a technique called hydraulic fracturing (fracking), huge deposits of oil shale, like the Marcellus and Utica deposits that extend from the Appalachians and into Canada, are now producing enough gas to meet North America’s needs for the next 14 years. The boom in gas exploration has opened up new markets for pipeline and joint coating materials to provide corrosion protection.
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.