AASHTO PP 98-20 PDF Download

AASHTO PP 98-20 (2021) is a standard specification that outlines the requirements for an Asphalt Surface Dielectric Profiling System using Ground Penetrating Radar (GPR). The standard specifies the necessary equipment and software needed for the system to accurately measure the quality of asphalt compaction. Additionally, the standard includes calibration and verification procedures to ensure the accuracy of the measurements.

The Dielectric Profiling System (DPS) utilizes GPR technology to continuously measure the dielectric constant of the asphalt surface. The dielectric constant is strongly correlated to the air void content of the asphalt, with higher dielectric constant values indicating lower air void content. The DPS system is capable of measuring the dielectric constant at highway speeds, providing real-time information about the compaction quality of the asphalt surface.