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Progress During the First Year Towards Building the Total Pavement Acceptance Device (TPAD)

During the first year of Project 0-6005, significant progress was made towards developing the Total Pavement Acceptance Device (TPAD). The TPAD will be a multi-function device that will be used to survey continuously along pavements at speeds in the range of 5 to 10 mph. The test functions will include those associated with Rolling Dynamic Deflectometer (RDD), ground penetrating radar (GPR), Distance Measurement Instrument (DMI) and high-precision differential Global Positioning System (GPS), and surface temperature measurements, as well as digital video imaging of the pavement and right-of-way conditions. The basic moving platform for the TPAD was selected and initial prototype tests were conducted at the Texas Department of Transportation (TxDOT) Flight Services Facility at Austin Bergstrom International Airport (ABIA). Progress was made in developing: (1) improved rolling sensors and associated data analysis methods commensurate with the target testing speeds and (2) an integrated data acquisition and display system that records all test functions on the same time and distance baselines.