AASHTO PP 98-20 (2021) PDF Download

AASHTO PP 98-20 (2021) is a standard specification that provides guidelines for the use of an Asphalt Surface Dielectric Profiling System utilizing Ground Penetrating Radar (GPR). The standard outlines the necessary equipment and software requirements for the system, as well as calibration and verification procedures.

The DPS system uses GPR technology to measure the quality of asphalt compaction in real-time, even at high speeds. It specifically focuses on measuring the asphalt surface dielectric constant, which is closely related to the air void content of the asphalt. The higher the dielectric constant, the lower the air void content.

By utilizing GPR technology, the DPS system can provide continuous and accurate measurements of asphalt quality, enabling transportation agencies and contractors to monitor and assess the compaction of asphalt during construction or maintenance projects. This helps ensure the durability and performance of asphalt pavements.