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The Federal Highway Administration, through its Innovative Bridge Research and Construction Program, requested research in the performance of paint coatings applied to bridges. The Maryland State Highway Administration tested two different, two ─ coat systems in a side-by-side comparison with its standard three ─ coat paint system consisting of organic zinc primer / epoxy polyamide intermediate / aliphatic urethane finish coat (currently the “State of the Art” system for most States).
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Major bridge rehabilitation projects may include painting of the steel superstructure in addition to deck replacement, expansion joint improvements, bearing replacement, etc. This paper will review the scheduling of the coatings work during a bridge rehabilitation project and how the order of coatings work affects the project schedule, cost, and quality.
Corrosion on steel bridges has long been recognized as a major concern. Over the years, technology has advanced from lead-based paints used for a century to three-coat systems. Recently, two-coat systems have been developed and are gaining acceptance. Research which is now underway to develop a one-coat system is described in this paper.
NEPCOAT (Northeast Protective Coating Committee) developed an innovative approach for streamlining coating material testing and selection on a regional basis. Following their success, AASHTO took the concept nationwide within their NTPEP program.
Fiber-reinforced polymer (FRP) strengthening has become a common technique used by many State Departments of Transportation (DOTs) around the country to address deficiencies with bridge structures. Carbon fiber strengthening systems are routinely used to strengthen pier caps, pier columns, concrete girders, impact damaged girders, and now steel structures. The paper will introduce the audience to the materials and the unique characteristics that make them so prized for repair and strengthening applications in civil infrastructure applications. Their use in bridge projects will be highlighted.
Bridge painting in the Northeast part of the country can be a challenge for the owner, their inspection staff and the contractor. Much the same as living in the northeast though a harsh winter, if planning and preparations are not done it could be a long cold season.
This discussion will review case studies from several bridge access projects where suspended scaffolding was used to provide safe, economical access for crews performing inspection, structural repair, demolition, blasting and coating work. Special attention will be paid to advanced project planning, worker safety requirements, unique platform configurations and productivity improving tips.
There are several thousand bridges that are scheduled for maintenance painting both in the State of Tennessee and Missouri. The Caruthersville Bridge (I-155 Mississippi River Bridge) is an on-going project, which is the northern-most bridge over the Lower Mississippi River, with the combined flow of the Upper Mississippi and the Ohio River.
The Federal Highway Administration has a top-level technology goal targeted toward the development and deployment of the “Bridge of the Future.” This is a conceptual short span bridge that demonstrates significant improvements over the current state of the practice – particularly with regard to ease and speed of construction and long-term durability.