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One of the, if not the most, vexing problems for bridge maintenance personnel is the deterioration of bridge components below leaking joints. The joints may be open or closed, construction or expansion, but all seemingly leak shortly after construction or resealing. The bridge components affected by the leaking joints may be steel or concrete, but the end result is the same, deterioration.
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The Florida Department of Transportation (FDOT) undertook recoating of the superstructure steel components of the SR 292 high-level bridge over the Intracoastal Water Way (ICWW) in Perdido Key, Florida, which carries one lane of traffic in each direction and is the only connection between Perdido Key and the mainland. Due to the significant impact to businesses and the public, including tourists, from any proposed lane closures, FDOT looked for other means to address the deteriorating paint system, provide for a longer service life, and complete the work without any lane closures on the bridge.
Choosing the right colors for any paint job is very important and can be fun. Remember when you were a child and got a coloring book for your birthday? Imagine if your canvas for coloring wasn’t bound pages, but rather the amazing Brooklyn Bridge. Wouldn’t that be exciting?
The University of Kentucky’s Kentucky Transportation Center (KTC) is working with the Kentucky Transportation Cabinet (KYTC) and the structural steel coating industry to develop a revolutionary tool to aid in the inspection of protective coatings applied to steel structures.
NEPCOAT stands for the Northeast Protective Coating Committee and is comprised of tenmember Departments of Transportation, from Connecticut, Delaware, Massachusetts, Maine,New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. NEPCOATwas founded in 1992 and has for thirty years evaluated and qualified paint systems for use onbridges, both for shop-applied new steel, and field-applied totally cleaned existing steel.
Metallizing in NH was a coating used only sparingly in the past at critical locations on two major bridges. Its greater use was severely limited by the lack of qualified applicators, absence from bridge fabricator operations, and overall excessive cost. This picture changed dramatically with the impetus of the new metallized Memorial Bridge project and the massive investment in metallizing equipment at a large local bridge fabricator that made metallizing possible for this bridge. The successful use and ten-year performance of the thermal spray coating (TSC), i.e. metallizing, on this bridge has had a significant impact on metallized New England bridges tofollow.
Desiccant dehumidification technology has transformed itself into a sophisticated and mainstream method that is used in many blasting and coating applications today. Utilizing temporary dehumidification and remote monitoring equipment for a blast and coating operation for the Onslow Beach Bridge allowed the project to be completed in 30 days – twice as fast as is typical for the type of project. This paper also will discuss how a contractor realized significant fuel savings due to the use of energy-efficient equipment.
The purpose of this study was to determine the actual service life of some commonly used bridge coating systems. A study authored by Gordon H. Brevoort and updated by KTA-Tator, Inc. in 1996 (1) provided a table of projected service life based largely on a survey of coating manufacturers. Are industry wide predictions of coating life accurate?
In 2003 Connecticut Department of Transportation (DOT) conducted a study to quantify the throughput and cost savings potential of a PAS two-coat system versus a three-coat system. The study showed that a PAS two-coat system had a 31% increase in productivity and direct cost savings of approximately $6 per square foot, with indirect cost savings of $18 per square foot when including the benefits of reduced traffic congestion.17 PAS two-coat systems utilize a zinc-rich primer for galvanic protection; the epoxy and polyurethane layers are replaced by a high-build PAS topcoat.
Building upon the balanced equifinality principle, the authors explore the placement and wording of the scope of work in painting specifications and specifications in general. Often the scope is buried in a thick labyrinth of complex legal requirements, general conditions, special terms, forms, attestations, and overly inclusive technical specifications which are in reality engineering standards.
Microbiologically Influenced Corrosion (MIC) is an important degradation mechanism for materials in civil infrastructure. Recent findings in Florida showed severe corrosion of submerged steel bridge piles associated with microbial activity. Furthermore, heavy marine growth (i.e., tunicates, hydroids, barnacles) was observed on the steel piles, which was also thought to affect the corrosion process by creating oxygen concentration cells and causing the initiation of localized corrosion.