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In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified.
In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified. Traditional wet film thickness measurements used in coating / lining work may not readily apply to the polyurea technology. This is due to the unique characteristics of the polyurea technology, primarily the fast cure / set of the system. Other forms of cured film thickness measurement are then required for polyurea elastomeric coating / lining systems. These methods may either be destructive or non-destructive to the continuous membrane. Destructive methods used will require repair of that area tested. Non-destructive methods may require the use of highly expensive and delicate test equipment. But either way, monitoring applied film thickness is a part of quality and can help insure a successful polyurea coating / lining project. This paper will take a look at the various applied film thickness measurement techniques and how they relate to the polyurea elastomer coating / lining technology. Specifically, this paper will focus on ASTM D 6132: “Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage” and the new SSPC Paint Application Specification No. 9: Measurement of Dry Coating Thickness on Cementicious Substrates Using Ultrasonic Gages.
Concrete and other cementitious surfaces are porous materials that will allow water and soluble contaminants to penetrate the structure leading to degradation. The effects of degradation can include efflorescence, laitance and physical defects such as cracking and spalling. Waterproofing concrete can protect it from freeze/thaw cycles, increase chemical resistance, and provide protection to imbedded reinforcing steel.
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This paper will discuss various considerations that should be weighed when writing a specification to line a concrete tank, secondary containment or industrial floor.
Cementitious repair mortars are commonly used to rehabilitate deteriorated wastewater concrete infrastructure prior to the application of high-performance lining systems. Commonly such repair mortars receive a broom finish creating a “profiled” surface prior to the application of a spray applied protective lining system. Other recommendations require that that the cementitious mortars receive a blasted (mechanically profiled) surface to impart a mechanical profile prior to top coating with a similar lining system. In the following paper the authors summarize the results of an investigation to quantitatively assess adhesion of a protective lining when applied to a broom finish surface verses a blasted surface.