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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.
Computerized maintenance painting management programs are used to inventory painted items, maintain historical coating data, optimize the scheduling of painting activities, and develop budget estimates for the work. While the sophisticated programs are quite effective, their true benefit is not realized unless someone takes ownership of the program, updates the data every few years, and uses the wealth of planning information that is available.
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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.
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.