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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.
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. On most paint-removal projects you go in knowing something about the building. You usually know how old it is. You often know the substrate. And that’s about it.
The seismic retrofitting of the County of Placer/Foresthill Road Bridge included replacing the gusset plates at the bolted connection points on the structure. Newly fabricated connection plates were prepared in the steel fabrication shop by abrasive blast cleaning and applying an inorganic zinc-rich primer. Existing connection plates were removed and the surfaces beneath abrasive blast cleaned and primed on-site with an organic (epoxy) zinc-rich primer. The connections were slip-critical.
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Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile must be accurately assessed to ensure compliance with job or contract specifications. But is profile height alone (the most commonly measured parameter) a good indicator of long-term coating performance?
Quality Assurance/Quality Control (QA/QC), often referred to as inspection, is critical to the success of a protective coating or lining project. Several parties can and do get involved in inspection including the owner, specifier, third party inspector, general contractor, painting contractor, equipment supplier, and coating manufacturer.