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We have known for years that our country’s infrastructure has been deteriorating, with little being done to prevent further degradation or to restore vital roads, bridges, tunnels, airports and railways to a safe, operable condition. Because of this serious problem, President Donald Trump promised a $1 trillion infrastructure investment to repair what he called the nation's "crumbling" infrastructure, and to initiate a "new program of national rebuilding."
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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.
When WIT Inc. was asked to rehabilitate the Alta Vista Standpipe, the first order of business would be to conduct a comprehensive tank evaluation in order to determine the overall condition, and also, to compile an inventory of deficiencies, repairs and upgrade objectives so that the project manual for the bid phase would include all necessary work to bring the tank to current AWWA standards.
Silicone room temperature vulcanizing (RTV) polymer based coatings were designed with maintenance, and extending asset design life in mind. This technology can be tailored to be used as the backbone for a wide variety of coating applications by taking advantage of the inherent properties of RTV silicone.
This paper summarizes environmental health and safety compliance issues as they relate to coatings projects. It summarizes control measures that should be taken to protect employees from exposure to agents such as silica, methylene chloride, n-methyl 2 pyrolidone, lead, and asbestos. Best practices are discussed. This information is taken from the Occupational Safety and Health Administration, the National Institute of Occupational Safety and Health and the American Conference of Governmental Industrial Hygienists.
Self-healing coatings have been promising due to their automatic recovering functions, which can extend the coating lifetime with lower maintenance costs. One of the most effective strategies to achieve self-healing property is to encapsulate healing agents inside microcapsules and integrate the microcapsules into the coating matrix.
Departmant of Defense Specifications/standards for the prevention and control of corrosion in the aerospace field.
Epoxy coatings have a long and successful track record in marine and protective coatings, due to the combined offerings of excellent corrosion and chemical resistance. As regional environmental drivers become firmly established, the industry is faced with the constant challenge of providing solutions which can comply with emerging VOC regulations. There is a continuous trend to move the technology from the so-called conventional paint to high solids coatings, and more recently, to ultra-high solids coatings [1]. At the same time the overall performance attributes associated with high performance epoxy systems need to be either maintained or improved depending on specific industrial application needs. Many current high solids epoxy systems use non-reactive plasticizers such as benzyl alcohol or alkyl phenols to enable full chemical conversion of the polymer matrix. While this approach allows for reduced solvent demand, such products do not always address the market need for extended service life. The use of fugitive plasticizers can cause the coating to lose its flexibility over time as the plasticizer leaches out. In order to address this, a different plasticization approach to lower solvent requirement and ensure complete cure is needed. This paper will review the basics of high solids epoxy coatings compared to conventional epoxy technologies and describe the fundamental technical differences. It will also present new versatile amine curing agent technology that offers solutions to develop coatings compliant with stringent emission test accreditation, and at the same time, addresses many of the technical challenges associated with high solids systems. Furthermore, the absence of nonreactive plasticizers facilitates long-term conservation of the mechanical properties of the coating, and hence, helps deliver long-term asset protection.
According to the international surface preparation standard for welds (ISO8501-3), the preparation grades before the application of paints are divided into 3 levels, P1, P2 and P3. These grades are described with rough qualitative representations, not description of surface treatment methods or measurable conditions. Because of the ambiguous wordings on the standard, there have been a lot of arguments for the surface preparation grades and abraded condition during the construction.
The present paper reports results of analyses that address the influence of physical and modeling variables upon failure projections.
A portable electrochemical noise measuring device has recently been developed to evaluate the corrosion-protective properties of anti-corrosive coatings in-service.
Inspection of coating applications is more efficient and effective by the use of electronic equipment, which can store, transmit, and populate inspection reports with data. Field collection of inspection data points by manual note taking is being replaced with instruments that can capture and record metal thickness, coating film thickness, surface profile depth, surface contamination, environmental conditions, gloss levels of coatings, and adhesive pull-off strength of coatings. Electronic collection of data produces more accurately and statistically complete information than manual collection.