Pavement Evaluation of the Concrete Tie-bars and Dowel Baskets on the Springfield Bypass, KY 55 Washington County, KY

A 1500 Mhz. ground coupled, ground penetrating radar antenna was used to identify both the horizontal alignment and the vertical displacement of the concrete tie-bars and the transverse joint dowel bar assembles on a portland-cement-concrete-pavement (PCCP) on KY55 in Washington County, KY. Approximately six lanes miles of PCCP was evaluated using the 1500 Mhz. ground coupled antenna. Results indicate that only four transverse dowel baskets out of an approximate total of 2,112 were within three inches of the pavement surface. Three transverse dowel baskets were misaligned greater than four inches from the location of the sawed joint. These areas represent 0.33 percent of the total transverse joints on the project. The ground penetrating radar results also indicated there were no areas along the longitudinal joint where the tie-bars were either too close to the pavement surface or missing