AASHTO TP 116-20 (2021) PDF Download

AASHTO TP 116-20 (2021) is a standard method that outlines the procedure for evaluating the rutting resistance of asphalt mixtures. The test is conducted using an Asphalt Mixture Performance Tester (AMPT) System and relies on Minimum Strain Rates (MSR) obtained from an incremental Repeated Load Permanent Deformation (iRLPD) Test. This method is specifically applicable to dense- and gap-graded mixtures with nominal maximum aggregates sizes up to 37.5 mm.

The purpose of this standard is to provide a consistent and reliable method for determining the rutting resistance of asphalt mixtures. Rutting is defined as the permanent deformation that occurs in a pavement due to repeated wheel loading, and it is a critical performance indicator for asphalt pavements. By conducting the iRLPD test and measuring the MSR, engineers and researchers can assess the rutting potential of different asphalt mixes and optimize their designs for improved durability and longevity.