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Reinforced carbon fiber gives ADOT new tool for bridge repairs

Improvements upgrade I-17 bridge at 19th Avenue from structurally deficient
July 11, 2017

PHOENIX – The Arizona Department of Transportation has turned to a space-age technique to repair and strengthen girders on two Interstate 17 bridges in Phoenix. As a result, one of those bridges is no longer listed as structurally deficient.

I-17BridgeOver19thAveCrewsAtWorkGirdersStrengthenedWithCarbonFiberPhotoFromQuakeWrapJuly17It’s the first time ADOT has used carbon fiber strips that are coated and strengthened with a reinforcing polymer to fix girders on state highway bridges, which in these two cases had been struck by over-height vehicles.

Instead of other repair methods such as injecting epoxy to rebuild sections of the steel-reinforced concrete girders, crews used the strengthening material called Fiber Reinforced Polymer, or FRP, to wrap the damaged girders. The repair work on the two I-17 bridges was completed in May.

The improvements were first done to the bridge carrying I-17 over 19th Avenue. That bridge’s sufficiency rating has now been upgraded, allowing ADOT to move it off the structurally deficit list.

The second repaired bridge, which carries Jefferson Street over I-17, wasn’t structurally deficient.

The term structurally deficient doesn’t mean a bridge is unsafe to use. It means certain repair needs, including component replacement, have been identified through an inspection.

I-17BridgeOver19thAveReinforcingPolymerAppliedToCarbonFiberPhotoFromQuakeWrapJuly17“Our ADOT Bridge Group focuses on using new and innovative bridge-repair technologies that enhance safety while saving time and taxpayer dollars,” said ADOT Senior Bridge Engineer William Downes. “The reinforced fiber strips add strength to the girders and are designed to limit the amount of debris that could fall should a girder be struck again.”

ADOT’s comprehensive bridge inspection program shows the overall condition of the agency’s state highway bridges is among the best in the country. Less than 2 percent of ADOT bridges are listed as structurally deficient.

“We think the carbon-fiber repairs are effective, can extend the lifespan of structures and can be done in much less time than other repair methods,” said ADOT State Bridge Engineer David Eberhart. “We’re likely to use it again if and when repairs are needed.”

FNF Construction Inc., of Tempe and FRP Construction LLC of Tucson, were contractors on the I-17 bridge repairs, using a carbon-fiber process for structural strengthening developed by a Tucson company, QuakeWrap Inc.

ADOT invests more than $40 million each year in bridge preservation as part of a program to safeguard the state’s $20 billion investment in its transportation infrastructure.

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Civil RightsTitle VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA)

Pursuant to Title VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA), ADOT does not discriminate on the basis of race, color, national origin, age, sex or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at civilrightsoffice@azdot.gov. Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.

De acuerdo con el título VI de la Ley de Derechos Civiles de 1964 y la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés), el Departamento de Transporte de Arizona (ADOT por sus siglas en inglés) no discrimina por raza, color, nacionalidad, edad, género o discapacidad.  Personas que requieren asistencia (dentro de lo razonable) ya sea por el idioma o por discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles en civilrightsoffice@azdot.gov. Las solicitudes deben hacerse lo más pronto posible para asegurar que el equipo encargado del proyecto tenga la oportunidad de hacer los arreglos necesarios.