AASHTO PP 104-20 PDF Download

AASHTO PP 104-20 is a standard practice that provides guidelines and procedures for the preparation and polishing of asphalt mixture specimens for dynamic friction testing. The purpose of this standard is to ensure consistent and accurate testing results by standardizing the sample preparation process.

The standard specifically focuses on the use of a three-wheel polishing device (TWPD) for the polishing of compacted asphalt mixture slab specimens. The TWPD is designed to simulate the polishing action that occurs on asphalt pavements due to traffic. It consists of a rotating wheel that applies a specified pressure and passes over the specimen surface, replicating the polishing effects caused by vehicle tires.

It is important to note that this standard is intended for use with slab specimens and not gyratory cylinders. If gyratory cylinders are to be used, additional specimen preparation procedures would be required.