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State Departments of Transportation let contracts for cleaning and application of protective coatings for steel bridge structures, but often lack staff with the training and knowledge to properly address technical issues that may arise on the project. The department’s engineering and inspection staff may be very skilled at administering a wide variety of construction contracts but lack the experience necessary to deal with the unique issues that often arise on painting projects.
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The San Mateo Bridge represents the largest application of thick film coatings for protection of a concrete highway bridge in the US to date. This challenging project was undertaken in order to provide a aggressive extension to the expected service life of the new concrete components of the widened bridge. This report provides a brief summary of the coating application process during construction followed by a report of a recent visual inspection performed at the five-year point in service.
Using climate control proved its “cool” during a major, temperature sensitive construction project for the Charles-de-Gaulles Bridge Project between Montreal and Repentigny Canada. The air treatment company teamed with general contractor firm Construction Injection EDM Inc and Versailles 48 Inc. the coating contractor to successfully control the temperature and humidity of the containments on the underside of the bridge during a challenging retrofit and application of protective coatings of the steel structure.
This paper discusses the history of coatings maintenance on the Golden Gate Bridge and the modern maintenance process including bi-annual inspection, prioritizing, scheduling and execution. Several current projects including water jetting and suspender painting are also discussed.
Bridge Owners are always on the lookout for a coating system for steel bridges that will perform for the longest time, and at a reasonable price. Metallizing has long been considered one of the best coating systems but the lack of qualified applicators simply has not made it available as an economical option. The success of early metallizing encouraged the investment in metallizing for Owners and bridge fabricators, and spurred on its significant growth over the past decade.
Corrosion’s destructive effects on critical steel infrastructure have costly economic and securityimplications for the United States. According to a NACE International report from 2001, the annualcorrosion costs in the United States industrial sector were $47.9 billion per year, with the largest portionstemming from the maintenance of critical utilities such as gas, water, electric, and telecommunications. Catastrophic failure due to corrosion jeopardizes the resilience of critical utilities, risking the interruption of service to millions and creates weak-points the nation’s homeland security.
Departments of Transportation currently use the conventional three-coat system as the predominant choice for the corrosion protection of steel bridge structures. Eliminating one step in the coating process could potentially save time and cost associated with lane closures and traffic control costs. This research paper evaluates several two-coat systems based on the zinc-rich primer and polysiloxane top coat technology.
The study objective was to evaluate the cost effectiveness and feasibility of a paint system warranty from a coatings manufacturer for a specified coating to be applied over steel with minimum surface preparation (without removing completely the existing coating or tightly adhering rust) and to evaluate the coating performance at the conclusion of the warranty period.
A bridge coatings specification can be a complex and sometimes confusing document to navigate through. Yet it is regarded as the rulebook for quality control and quality assurance personnel responsible for inspecting the quality of work. An inspection plan is a tool that can make the process of understanding the inspection checkpoints invoked by a bridge coating specification more streamlined and can be a key communication tool for contractor and inspection personnel.
This presentation discusses how the Florida Department of Transportation has modified and amended its coatings material acceptance policy and contractor coating application requirements to improve corrosion protection of Florida’s transportation infrastructure. The cost saving advantages to the State are estimated to range from $2.3 to 19 million/year
The seismic retrofitting of the County of Placer/Foresthill Road Bridge included replacing the gusset plates at the bolted connection points on the structure. Newly fabricated connection plates were prepared in the steel fabrication shop by abrasive blast cleaning and applying an inorganic zinc-rich primer. Existing connection plates were removed and the surfaces beneath abrasive blast cleaned and primed on-site with an organic (epoxy) zinc-rich primer. The connections were slip-critical.
Coating technologies for bridges has not changed much since 1977. Available finish coat technologies were limited to alkyd, acrylic, or urethane-based chemistry. Performance of these chemistries has declined over the years due to cost reduction in paint to meet project pricing requirements. Bridge owners and engineers have had a limited selection of high-performance coatings to protect their assets. This is even more important with high profile structures where the finish coat needs to stand the test of time and limited maintenance funding has forced asset owners to extend time in between cosmetic maintenance