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This presentation is designed to assist wastewater treatment plant maintenance superintendents effectively design and implement maintenance painting projects. Recommended practices are described for all project phases, from the initial corrosion survey, through cost estimating, specification preparation, bidding, project administration, field inspection, and OSHA, environmental compliance and plant operation considerations.
Liquid-applied protective linings are commonly used to protect concrete structures found within water and wastewater treatment facilities. There are a number of referenced industry standards and guidelines detailing the construction of new concrete, evaluation of existing concrete, and surface preparation of concrete. This paper provides recommendations based on industry standards and related publications, as well as drawn from practical experience for preparing concrete for immersion conditions or chemical containment service in water and wastewater treatment.
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Coatings maintenance projects are typically scheduled and selected based on ASTM rust grade, service environment - corrosion rate, coating condition and project visibility or aesthetics. There is something missing. That something is a risk-based assessment. This paper will demonstrate how to make a risk grid and accommodate this into condition assessment criteria for prioritizing and scheduling painting projects.
After 35 years or longer in service, the concrete infrastructure in wastewater collection systems and treatment plants has deteriorated due to various corrosion and physical degradation mechanisms. This paper reviews the major mechanisms that cause deterioration of concrete and protective coatings. Also, examples of infrastructure degradation are presented along with a discussion of the best diagnostic methods for condition assessment of concrete for the various mechanisms.