AASHTO PP 103-20 PDF Download

AASHTO PP 103-20 is a standard practice that provides guidelines for accurately preparing and polishing unbound aggregates for dynamic friction testing. The standard focuses on the use of a three-wheel polishing device (TWPD) to achieve consistent and reliable results. The purpose of this process is to simulate the wear and polishing that aggregates experience in the field, allowing for accurate assessment of their frictional characteristics.

The standard outlines the necessary equipment, materials, and procedures for sample preparation and polishing. It includes specifications for the size and shape of the aggregates, as well as guidance on the appropriate weight and number of samples to be tested. The TWPD is introduced as the preferred method for polishing the aggregates, and the standard provides detailed instructions on its operation, including the type of abrasive paper to be used and the duration of the polishing process.