This paper describes the results of a comparative study of performance
of different pavement designs in North Carolina. Testing was carried
out at an instrumented test facility constructed on the US 421
Bypass near Siler City, North Carolina. The experimental stretch
was about seven and a half miles long and was composed of 12 pavement
section types, two of each type in two directions of traffic (having
different expected traffic loads), for a total of 48 sections.
Based on field measurements, such as stress, strain, and distress
survey analysis, the performance of the various sections were
analyzed. Subgrade stabilization was found to provide the maximum
assistance to the pavement sections. Sections with asphalt concrete
bases performed better than sections with aggregate base courses.
Cement- treated base course sections performed the worst. Also,
in this study, it was noticed that almost all the rutting was
limited to the asphalt concrete layers.