Case Studies of Pavement Performance, Phase I. Kentucky: Fid-Bau Portal

Case Studies of Pavement Performance, Phase I. Kentucky

P. J. Vedros / W. R. Barker

The objective of this study was to identify the causes and mechanisms associated with cracking and rutting of flexible highway pavements. This objective was approached through in situ field investigations, laboratory testing, and theoretical analysis. Field tests were accomplished at two test locations near Lexington, Kentucky. Pairs of test trenches were opened in distressed and nondistressed areas in the pavement for comparative purposes; and tests including CBR, moisture, density, cyclic plate, deflections, vibratory measurements, and surface profiles were conducted. Extensive laboratory tests were performed on sampled materials of pavement, base, and subgrade. Resilient and creep characteristics of materials were developed and used to evaluate existing prediction techniques. Data analysis indicates that there were no apparent differences between test pits to explain why the pavement would be cracked at one test pit but not at the other. Strength of test pit materials indicated no significant differences. The nonlinear elastic finite element program was found to predict the resilient deformation of the pavement system.