Development of an Improved Overlay Design Procedure for Oregon. Volume 2. Evaluation of Procedure

摘要

The report is the second in a three-volume series dealing with the development of an improved overlay design procedure for Oregon. The report presents the results of the second year findings. Data from five projects were collected and analyzed using both NDT methods 1 and 2 from the 1986 AASHTO Guides. The overlay thickness using the AASHTO procedure were compared with those using the Caltrans and Oregon DOT methods. Though the results indicate there is reasonable comparisons between the various methods, the authors have concluded that NDT method 1 still needs further work, particularly in developing reliable backcalculation methods, and NDT method 2 can be used now with reasonable confidence.