Use of FRP Composites in Bridges
FRP (Fiber Reinforced Composites) have been successfully used in the construction and repair of transportation bridges in the U.S. for several years. These projects have proven that the materials and work methods are can be successfully used.
FRP rebar can replace steel rebar and provide equal physical strength while eliminating the corrosion problems of having steel embedded in concrete.
Prefabricated bridge decks made of FRP in a factory can be quickly and easily installed in the field to save time and money during the bridge construction project. The large panels are shipped in and laid down, ready to use very quickly. Concrete cure and inspection times are reduced.
Concrete crack repairs can be made to bridges and concrete structures by wrapping them with composite materials to seal these cracks and hold the concrete together, protecting it from further damage.
This technology has been in development for many years, and proper materials, construction techniques, and design guidelines have been established to allow for many successful projects to be completed.
Economics play a considerable role, and this cost comparison constantly changes with the prices of materials on both sides. Composites have the advantage of typically requiring fewer road closures and construction time in the field.
Composite Bridge Decks
The application of fiberglass composite bridge decks has been under development for some time. The technology has been applied at several sites around the country and engineers and designers are getting comfortable with the technology. It basically combines resin-infused decking panels that are placed over fiberglass composite or steel bridge beams. Sometimes the attachment is mechanical, and sometimes the use of high-strength adhesives carries the load.
Replacing steel and concrete, composite bridge decks claim several advantages. They can be built in a factory as opposed to onsite (better quality control) transported and lifted rather easily, and should be much more resistant to the natural elements of freeze/thaw. One of the big savings is on installation time. The on-site construction time is much less, which allows for cost savings from road closures, detours, and site crews.
There has been TONS of Research and Development money spent by several federal, state, and private entities in developing the technology, testing, and specification criteria for this application of composites to the real world. Hurdles that need to be overcome include the acceptance by engineering professionals, infrastructure managers, and the public.
As a Composites Engineer, it sure is neat to see new applications of composites. And as a taxpayer, if it can save some money, I am very excited. As a driver, it sure would be nice to see some of these road projects shortened up!
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