Existing US Navy Coefficient of Friction (CoF) meters are insensitive and cannot differentiate surfaces which have obvious differences in nonskid CoF. A new CoF meter, the m-Deck, was evaluated to determine CoF measurement effectiveness and temperature sensitivity. Both laboratory and field testing were performed over various nonskid systems at numerous temperatures. The results indicate that the m-Deck has significant temperature dependence, but also a high degree of accuracy. The collected data is used to establish acceptance criteria for newly installed nonskid.
This paper details a novel surface preparation process that is suitable for Duplex coating of galvanized steel intended for a variety of atmospheric and embedded service applications. It provides all the properties necessary for excellent coating performance and longevity, including high adhesion, excellent resistance to cathodic disbondment, and resistance to ingress of water, without the drawbacks associated with abrasive blasting, the traditional surface preparation method.
Although the form and function of a well-designed building are important, it is the long-term performance and durability of a building and its components that will be important to the owner(s) and occupants. Therefore, during the design of buildings, the selection of the appropriate materials and understanding the long-term performance of the specified materials exposed to various site-specific environmental conditions is critical in avoiding the potential “failure by design”. The case study presented will focus on the coating failure by design, that could have been avoided by the original design and construction team and resulted in costly litigation and eventually the complete removal of a key architectural element on two high-rise condominium buildings located along the Florida coastline
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.
There are many factors which need to be considered when making the decision to over coat an existing coating system. With the magnitude of data that need to be evaluated in relation to the existing coating system and potential scenarios that are possible it is important to take multiple details into account. Details including inspection criteria of the existing coating system and substrate, owner’s goals and objectives, asset location and environmental conditions must all be taken into consideration.
The DoD functions under a wide array of infrastructure to include, but not limited to, ships, tanks, combat vehicles and buildings. Due to the nature and need of the building materials, these are always at risk for corrosion, causing the infrastructure to literally crumble. This obviously puts Soldiers in harm’s way due to issues such as weapon misfiring and structural failures.
Solvent-free two component polyurethane (2-K-PU) systems have been approved as suitable protective coatings systems since many years. Two component polyurethanes are favored within pipeline and tank constructions where high performance and durability have to be accomplished under harsh conditions (e.g., field application, high service temperatures, high salt load, wet soil conditions etc.).
In the past, the present and undoubtedly in the future, coating specifications will be written and included in bid packages that will end up on your desk, mine and our fellow colleagues. Often these specifications are poorly written, boiler plated or haphazardly thrown together to hopefully provide us with enough information to successfully win and complete a given contract.
The U.S. Army Corps of Engineers owns and operates the vast majority of the countries lock and dam structures for inland navigation. The large steel gates on these structures are subjected to a severe impact and abrasive environment while in immersion by debris such as timber, ice, steel drums, etc. High VOC vinyl resin coatings have historically been the best available coatings for these structures in this environment but have exhibited very poor performance at the water line where the impact and abrasion is at its worse.
The Cool Roof Rating Council (CRRC) is a non-profit organization, which maintains a rating program for roofing materials. The CRRC also addresses many current technical and regulatory issues involving cool roofs and continues to provide an independent third-party ratings system in an arena that is continually evolving. The CRRC/RCMA (Roof Coatings Manufacturers Association) substrate study, initiated in 2008, is an example of an investigation designed to address an important technical issue. This study aims to evaluate the influence of roof substrates on reflectance and emittance properties of cool-roof coatings, in the field over a three-year period.