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This case study shows how the City of Virginia Beach addressed concrete tank foundation deterioration and steps taken to reduce future deterioration, including moisture control, impact of Alkali Silica Reaction, concrete analysis and proper surface preparation, coatings applications and inspection.
Inspection has always been a hot topic when it comes to coatings projects. There are some substrates that can be harder to specify due to not knowing without knowing which testing is relevant to specify and properly inspect the substrate and surface after it is coated. Concrete is probably the number one substrate that is confusing. This paper will dive into the testing that is relevant when specifying coatings for concrete tanks and structures. Whether it is how to properly check film build or whether or not an ASTM test is relevant, this paper will clear the waters and make specifying coatings for concrete tanks and structures easier.
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Cracks in a concrete substrate pose a challenge for coatings. Cracks that are not properly identified and addressed can lead to premature failure of the coating. This paper will discuss the forces that cause cracking in concrete structures, as well as crack types and repair techniques.
Reinforced concrete structures are subject to many types of deterioration. Many of these are visible; however, one that is not is the crevice corrosion that occurs internally at the reinforcing bars. To detect, mitigate and delay this type of insidious corrosion, a form of cathodic protection in the form of thermal sprayed coatings will be discussed. To implement this as a corrective action as well as a preventive action is the theme of this paper.