All factors have two levels. A base layer and one or more subbase layers may exist but are not required. A seal coat is also permissible above a granular base layer. JCRPs without load transfer devices or using devices other than smooth dowel bars at the joints are not included. Sampling design factors for this study are moisture, temperature, subgrade type, traffic rate, joint spacing, and PCC thickness.
All factors have two levels.
One or more subbase layers may exist but are not required. A seal coat is also permissible above a granular base layer. Sampling design factors for this study are moisture, temperature, subgrade type, traffic rate, percent reinforcing, and PCC thickness. All factors have two levels. The GPS-6 data includes sections which were a part of the original LTPP experimental design for rehabilitated pavements, as well as those which have been added in response to changes in practice.