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As the author Robert M Pirsig stated, “Technology presumes there’s just one right way to do things, and there never is.” Whilst measuring coating thickness on concrete substrates is not new, the introduction of a new non-destructive thickness (NDT) gauge to measure coatings on concrete not only allows the user to evaluate the results obtained by existing instrumentation, but also provides an alternate non-destructive measuring solution - thereby increasing the industry’s confidence in the overall measurement technology.
As the author Robert M Pirsig stated, “Technology presumes there’s just one right way to do things, and there never is.” Whilst measuring coating thickness on concrete substrates is not new, the introduction of a new non-destructive thickness (NDT) gauge to measure coatings on concrete not only allows the user to evaluate the results obtained by existing instrumentation, but also provides an alternate non-destructive measuring solution - thereby increasing the industry’s confidence in the overall measurement technology. Ultrasonic measurement of DFT as defined in SSPC PA 9 requires an ultrasonic gauge that has a minimum accuracy within ± 5% - why? Is it because existing technology relies on the inspector knowing the expected thickness and adjusting the gauge accordingly or is it due to the performance of existing instrumentation? Recent advances in technology have led to gauges becoming more reliable and ensure that the user no longer needs to know the DFT before inspecting it. This paper looks at the current measurement techniques, the advances in NDT measurement technology, things to look out for when measuring the coating thickness on concrete substrates, how to accurately, reliably and confidently measure coatings on concrete according to ASTM D 6132 and SSPC PA 9 and how to more effectively manage the results.
Corrosion mitigation by the use of barrier coatings relies on polymers and other substances to minimize the permeation of corrosive agents to the substrate. To achieve good barrier properties, most protective coatings rely on high crosslinking density and special fillers to increase the tortuosity of the film. However, this approach usually leads to highly viscous and brittle coatings that take too long to cure. In contrast, flexible and tough coatings typically do not have the requisite barrier properties for enhanced corrosion prevention.
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The use of single component water based coatings for protection of metal substrates continues to grow due to their low odor, health and safety advantages, easy cleanup and environmental friendliness. Nevertheless, the challenge continues to find alternatives to the traditional chromate, zinc or similar heavy metal type corrosion inhibitors which tend to rely on passivation or sacrificial cathodic protection.
This group of authors, thinking outside the proverbial box, and with a mind to Shakespeare’s Macbeth, presented a paper at SSPC 2010 entitled “Hubble, Bubble, Tests and Trouble: The Dark Side of Misreading the Relevance of Coating Testing”. A challenge to the status quo of coatings performance testing, the paper boldly questioned much of the conventional wisdom surrounding coating testing and how that testing is interpreted.