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This paper provides an overview of typical non-destructive test (NDT) procedures currently used for pavement structural evaluation applications. In particular, surface deflection measurements, spectral analysis of surface waves (SASW), and ground penetrating radar (GPR) approaches are described and discussed. Data interpretation and application, including problems encountered with each type of measurement, are also covered. Potential future developments in this field are discussed.

How the California Department of Transportation Accelerated Pavement Testing (CAL/APT) Program was established is described. Discussion includes history of the program, search for full-scale pavement testing technology suitable to California, results of a pilot project conducted on test pavements built in South Africa, laboratory tests included in the CAL/APT program, and development of an organization to manage CAL/APT and implement its products. A status report on testing and planning is included.