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For years, accelerated weathering test equipment has been utilized to showcase performance of coatings as a means to justify changing to new and “better” materials. While an accelerated weatherometer is useful in confirming a material’s performance, the results can be misleading in certain situations, resulting in misguided decisions based on a marketing department’s zeal to secure additional sales.
For years, accelerated weathering test equipment has been utilized to showcase performance of coatings as a means to justify changing to new and “better” materials. While an accelerated weatherometer is useful in confirming a material’s performance, the results can be misleading in certain situations, resulting in misguided decisions based on a marketing department’s zeal to secure additional sales. This paper shares test results from two different accelerated methodologies prescribed by the American Society for Testing and Materials (ASTM) and compares those results to natural daylight exposure in an attempt to help set the facts straight on how to benefit from accelerated weathering to better understand long-term durability with respect to ultraviolet light exposure and help debunk myths regarding performance-based data driven solely by accelerated exposure results. Accelerated test selection will be discussed, as well as statistical validation for accelerated method preference to natural sunlight results.
In restoration cleaning of historic masonry, you usually know based on contaminants and building fabric what kind of cleaner will be effective on a dirty building. You’ll use one type of restoration cleaner for atmospheric staining, and another for biological soiling. You’ll have an idea, going in, what kind of restoration cleaner to at least try. Not having that kind of information, in my experience, is what makes paint removal from historic – or just old – masonry the most challenging branch of restoration cleaning.
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The polyurea technology is not new to pipelining work, with earlier basic applications dating back more than 15 years. Much of this work was either performed by hand spraying (large diameter pipe) or simple robotic systems for individual joint sections of pipe. Continued work over the years has proven that in-place pipelines can be commercially completed as well. More recent work has even shown that in addition to long, straight runs, robotic developments have allowed for lining both 45° and 90° radius bends in the pipeline system.
Explains why concrete floors need protective treatments, identifies two main categories of protective treatments, and recommends appropriate protective treatments based on purposes and finishes of concrete floors.