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Moisture is a key component of concrete. It is critical to the curing and strengthening process of the product. It is however the use or misuse of this critical component that may cause expensive and unavoidable problems over the life of the floor
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Metals and their alloys offer high strength and outstanding mechanical properties. When exposed to corrosive conditions metals corrode first creating minor aesthetic problems then with time and further corrosion significant damage and a loss of service life. Corrosion has a demonstrated economic impact on all modern societies. Often multi-layer anticorrosion coatings systems protect the metal from corrosion.
Vinyl coatings have long been used in the hydro industry for steel structures. As VOC regulations and product availability have changed, owners have moved toward alternative technologies to replace those systems. The intent of this information is to understand the status of vinyl technology, identify and discuss other systems that have historically been used as an alternative, and to review the possibilities of new technologies for these applications.
Maximizing coating system longevity reduces total ownership costs to the US Navy fleet. Coating performance is directly tied to achieving proper film thickness control across the entire project surface. A novel concept of using digital camera/filters in synergy with MIL-PRF-23236 coating technology with enhanced optical properties provides unique inspection capabilities.
The US Environmental Protection Agency defines "Volatile Organic Compounds (VOC)" in 40 CFR 51.100(s) as “any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which participates in atmospheric photochemical reactions.”
The presentation is meant to be a guide for owners, contractors, and engineering/inspection teams – from the perspective of a licensed resident engineer – on how to be successful bidding, scheduling, coordinating, and performing work on a large scale and high-profile coatings contract. Contractors will gain insight into aspects of the project that may be outside their specialty and see examples of unanticipated issues that develop during a major project that should be considered when preparing a bid.
Over the last thirty years, I have been asked by numerous people, including my children, what I do for a living. After trying to explain about corrosion, site condition assessments, coating system selection, specification writing, inspection, training, etc., I default to a standard answer that I am sure many of my readers have used - "I watch paint dry."
With a history of proven performance in architectural and industrial coatings and the ability to adhere to less-than-ideally prepared substrates, alkyd resins have remained at the forefront of coating technology for well over 50 years. With such an established history, alkyds are often thought of as old technology and synonymously associated with flammable solvents and high levels of volatile organic compounds (VOC). These historical associations are not the contemporary story.
This presentation briefly updates a two-part article printed in Water Engineering & Management in 2001. It begins with the benefits of waterborne coatings and gives examples of where they may be used.
Coatings are constantly being asked to go to greater extremes, such as lower VOC and higher performance. This paper will discuss coating technologies that are being asked to go beyond the typical protective and aesthetic aspects of coatings and offer other functions. Several types of waterborne functional coatings will be described, including technologies for combating noise, heat, and air pollutants.
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.