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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.
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.
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Epoxy linings have long been the standard generic resin type when specifiers are selecting products for lining new steel potable water tanks or rehabilitating existing steel potable water storage tanks in North America. The one exception to this rule has been the Canadian potable water storage market. In Canada many specifiers have recognized the benefits offered by 100% Solids Elastomeric Polyurethane linings for 25+ years with admirable results.
High performance concrete coatings are frequently applied with a grade of texture to improve traction and safety. The finished texture is dependent upon the size and type of aggregate, application method and density, and the amount of topcoat applied over the texture. Defining the degree of texture within a specification and translating the description to installation has typically been left to individual interpretations.