The report details the planning, design, and construction of the retrofit measure on the KY 583 Bridge (047B00072N), which traverses the Bluegrass Parkway in Hardin County, Kentucky. Reinforced concrete girders within the span over the eastbound Bluegrass Parkway of the bridge had cracks that led to concrete delamination and deterioration of the girders.

To remedy the problem, triaxial carbon fiber reinforced polymer (CFRP) fabric sheets were selected to perform a retrofit due to their strength, conformability, and flexibility. The concrete surface, over which the fabric sheets were applied, were first prepared by removing all spalling and deteriorated concrete, which exposed corroded rebars within the region. The rebars were cleaned and coated with a zinc primer. Soon after, formwork was built around the damaged area. A bonding agent was applied and repair mortar placed within the formwork to return beams to their original shape. The area targeted for strengthening was then sandblasted, and triaxial CFRP fabric was applied using a two-part saturating epoxy.

The retrofit was completed in May of 2014, and the bridge was monitored over a three-year period. No defects were observed in the retrofit during this time. Eighteen months after the retrofit, inspectors found an additional crack location causing concrete delamination, away from the retrofit locations.

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© 2017 University of Kentucky, Kentucky Transportation Center

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