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When a project finally reaches the bidding stage, many of the owner’s questions and concerns regarding the project's outcome have been considered. However, given the ongoing effort to continually extend every assets useful service life, one important question that gets asked more and more is “How long is my coating system going to last?”
When a project finally reaches the bidding stage, many of the owner’s questions and concerns regarding the project's outcome have been considered. However, given the ongoing effort to continually extend every assets useful service life, one important question that gets asked more and more is “How long is my coating system going to last?” Unfortunately, the response an owner may receive can too often be delivered by an unqualified individual, be based on unknown or unreliable service environment information, or even worse yet, be given as a best guess. This paper offers a more reliable approach to providing an owner or specifier with a true anticipated service life for a protective coating system based on evaluating service life conditions, choosing appropriate industry standard surface preparation methods and selecting the proper material chemistries for a given service environment. Differing scenarios will be offered to provide real life examples.
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.
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High performance fluoropolymer resin systems for coatings applications have been commercially available for years. These technologies provide the owner a coating system that will far outperform other coatings in terms of exterior performance, most notably in chalk and fade retention. This paper will discuss the chemistry of the two primary types of fluoropolymer resins utilized in the protective and architectural coatings markets and explore the mechanisms by which they provide improved exterior durability. Additionally, the benefits of fluoropolymer coatings will be explored in specific applications.
The South Valley Sewer District, located outside of Salt Lake City, Utah, experienced severe degradation of the concrete substrate the Membrane Basins at the Jordan Basin WRF. The Bowen Collins & Associates designed facility initially opened for service in July of 2012. By 2017 the facility was showing significant effects of concrete deterioration from chemical attack, caused by citric acid and sodium hypochlorite used as a part of the cleaning procedures in the membrane basins.