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A five-year coatings research project was initiated by the Pennsylvania Department of Transportation in 1986 to evaluate the performance of an organic zinc rich coating system. The coating system consisted of a moisture cured urethane zinc rich primer, an epoxy intermediate, and an aliphatic polyester urethane finish coat. The system was applied to the Windgap Bridge located in McKees Rocks, Pennsylvania (near the City of Pittsburgh) in 1986 and 1987.
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In 1998, 10,000 square feet of epoxy, decorative quartz flooring was specified for a vivarium at a major University on the West Coast. This installation was performed by the material manufacturer’s certified contractor and was completed in November 2000. A few weeks after installation bubbles and blisters appeared. When the blisters were punctured they contained liquid. As anticipated, the moisture vapor emissions were confirmed to be 4 to 9 lbs in excess of the manufacturer’s recommended maximum of 3 lbs
This paper will focus on the application of polymeric coatings and linings, which include, but are not limited to, polyamine and novolac epoxies and vinyl esters. These materials are delivered to the job site in buckets or bags and are mixed and applied on-site, and it is the responsibility of the owner, engineer and material supplier to determine the type of material and coating system to specify for any particular project.
This paper describes the results of a research study to determine the effectiveness of various rehabilitation materials and techniques for concrete bridges. This work reflects the needs for identifying effective materials and techniques to offer protection against corrosion of steel in concrete as well as patch repair in concrete girders.
This paper examines the authors successful experiences on some simple and very complex projects where both the coatings and environmental requirements were limited to a few pages. Being made up almost entirely of SSPC/NACE and PDCA standards that described “performance criteria” as opposed to being a prescriptive or proprietary type of specification defining what was to be used, when it was to be used and how it was to be done.
Clear water repellents are penetrating or film-forming coatings formulated to protect porous substrates by reducing the penetration of liquid water. Penetrating water repellents enter the pore structure of the substrate and deposit their water repellent component on the walls of the pores. Film-formers deposit their water repellent component on the surface of the substrate.
Galvanized mast arms support uncounted numbers of traffic signals and signage throughout the United States. The proportion of these that have a “duplex” coating system (both galvanizing and organic coatings) is unknown. However, the number is surely significant, and the number of coating system failures is also significant.
Current and future coating restrictions that reduce atmospheric emissions as well as the potential for the leaching of chemicals into drinking water systems are pushing tank owners and/or specifiers towards the use of 100% Solids by Volume (SBV) coatings. A majority of these high solids coatings whether epoxy, polyurethane, or polyurea, can or should be and in some instances must be, applied using Plural Component (PC) spray equipment.
To determine how colors change during weathering, ten non-leaded polyurethane colors were exposed to QUV accelerated weathering, Chicago outdoor exposure and Florida outdoor exposure. Color change, percent gloss retention and Aesthetic Ratings were made every 1000 hours in QUV up to 8000 hours, yearly in Chicago exposure for four years and yearly in Florida exposure for three years.
Concrete superstructures are either post-tensioned or prestressed using mild steel tensioning strands running the length of the concrete structural members. In most designs, the mild steel strands are uncoated and rely solely on their proper placement within the concrete member and the concrete itself to provide adequate corrosion protection.
The range of flooring options available in today’s marketplace is vast, each having their own individual place and performance characteristics. As such, owners and design professionals must evaluate many factors to determine the best flooring option for a structure’s given needs and what its environment will allow. One flooring system or option gaining popularity is polished concrete. Although polished concrete is relatively new in North America (approximately 15 years), this system offers many advantages over other flooring options.
There is ongoing development of new technologies, designs, and construction practices that result in reduced energy use. Through development of these technologies and incorporation of them into Building Standards, the energy and water use and greenhouse gas emissions from these buildings will be substantially reduced. One of the compelling measures that will continue to be developed and expanded is the high efficiency improvements to the building envelope, including cool roofs and other measures to reduce the impact of solar gain on roofs and attics.