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Research conducted at OakRidge National Laboratories in Oak Ridge, TN, National Research Council Canada, and many other institutions around the world have shown that controlling airflow through the building envelope is more important and effective in reducing heat loss and moisture transport than controlling vapor diffusion.
Research conducted at OakRidge National Laboratories in Oak Ridge, TN, National Research Council Canada, and many other institutions around the world have shown that controlling airflow through the building envelope is more important and effective in reducing heat loss and moisture transport than controlling vapor diffusion. This research has demonstrated that air leakage through the building envelope has the ability to transport exponentially more moisture through the building envelope than occurs through water vapor migration. Controlling air flow has reduced problems such as corrosion, deterioration of wall components and the growth of mold. Other benefits are improved energy efficiency and indoor air quality.
Water leakage into exterior wall construction is one of the principal causes of damage and deterioration to facade materials and underlying construction. This paper discusses the basic approaches currently used to keep water out of buildings and their relationship to several common exterior wall systems.
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Recently, the advantages of thick film coatings and linings have led to uses in many different applications in the industrial, commercial and automotive markets. Although this polyurethane and polyurea materials have excellent physical properties, they are based on aromatic chemistry which is susceptible to damage from UV radiation and is not light stable.
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.