One experimental Multidepth Deflectometer (MDD) was placed in the Dupont Clay subgrade, and that area of the Test Strip was tested with a single wheel. The effort served as the precursor to the development of the 4 Horizontal Position Devices (HPD’s) ultimately placed in the subgrade of the CC-5 Test Items.
Three longitudinal recessed strips were provided in the surface of the DGA base within Transition 2. One strip was 8.5 ft. wide, 1 inch deep, extending from station 110 to 150 at the north edge; the second was 9.5 ft. wide, 2 inches deep, extending from station 110 to 150 at the south edge; and the third 12 ft. wide, 2 inches deep, extending from station 100 to 150 at the pavement centerline. The top surface of the HMA was placed level with no recesses. The purpose of the recessed strips in the DGA base was to study the response of the asphalt paving machines to the resulting bumps as determined by the FAA profiler and the accompanying FAA pavement roughness software.
Click here to download the Test Items CC5 Sensor File.