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Many challenges face today's coatings specifiers in selecting high performance coatings and linings. New formulations are being developed to meet changing performance needs and also future VOC requirements. Evaluation of these "new" coatings and linings can be difficult. It is the purpose of this paper to look at past, current and future coating evaluation methods in order to develop a testing protocol that can be used to assist in the selection of high performance coatings and linings for wastewater environments.
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Cracking of concrete repair materials is a critical factor affecting the service life of a repaired structure. Cracks in repair materials provide a pathway for moisture to carry deleterious materials into the concrete and accelerate corrosion of imbedded reinforcement. Existing cracks can also fill with water and cause further crack propagation as well as accelerated deterioration due to freezing and thawing conditions.
“Tilt-up" is a state-of-the-art building system in which steel reinforced concrete panels are cast on site and tilted up into their final position. The tilt-up panels are load bearing and also function as cladding elements. With the exceptions of integrally colored concrete, tilt-up concrete panels can look bare and unattractive if a finish is not applied. It is also well known that concrete is not a “perfect” material as it shows porosity and micro-cracks which can lead to deterioration over time.
The repair and restoration of deteriorated wood siding, trim, and ornamental plaster on the exteriors of older buildings is one of the cornerstones of what is called a “Painting Restoration”. From the symptoms of paint failure, one can determine the underlying causes, and then decide upon the proper cures.
This paper identifies the problems with large multi-year painting projects and discusses the benefit to Facility Owners and Contractors for breaking a large bridge project into smaller phases. It will also discuss factors that determine the optimum size, large or small, of a painting project and their impacts. The size of a project will be analyzed from the standpoint of money, time, insurance, bonding, manpower, inspection, management, bridge inventory and job quality.
Anchor profile achieved during field blast cleaning operations is often found to be deeper than expected, even when available information suggests the size of the abrasive selected was appropriate. Three parameters long identified as influencing anchor profile depth were evaluated under laboratory conditions.
This paper addresses the general rules and principles under federal and select state law1 (California and Michigan) surrounding the use of brand name or “or equal” clauses in public procurement. Specifically, it focuses on the prohibitions or restrictions upon solicitation provisions that favor one contractor over another, or one product over another, through the use of a brand name or “or equal” provision in the solicitation.
This paper describes concrete rehabilitation of the primary treatment process at the Fairfield-Suisun Sewer District Treatment Facility. The paper encompasses V&A’s initial concrete condition evaluation, coating specifications, and the warranty coating inspection. Notable items of discussion include coating selection, construction window, flow diversion schemes, and full-time coating inspection.
In new shipbuilding industries, conventional solvent-born coatings require longer curing period at low temperature season, which creates the needs for fast curing coatings to meet work schedule. In this study, several kinds of solvent free rapid cure epoxy coatings and polyurea coatings were evaluated in terms of feasibility for ship’s water ballast tanks (WBT).
To the contractor inexperienced in dealing with the federal government, the contracting process can be confusing and quite time consuming. However, a systematic approach can reduce confusion and reduce the time needed to begin bidding on federal government contracts. This streamlined approach will aid the prospective federal contractor in securing a contract and avoiding costly errors.
Performance properties of solvent-based urethane topcoats formulated with fluorinated polymers are reviewed. Fluoro-urethanes offer outstanding gloss and color retention, good chemical resistance, and excellent adhesion. The long coating service life of fluoro-urethanes reduces the frequency of maintenance work and subsequent downtime interruption.
A new water-soluble quaternary ammonium compound, didecyldimethylammonium bicarbonate/carbonate (DDABC), has been evaluated as a corrosion inhibitor via standard electrochemical tests on steel and shown to be highly effective. At the proper dilution, the inhibitor migrates to the metal/solution interface and forms a monomolecular film on the anodic sites.