Field and Laboratory Study of High-Polymer Mixtures at the NCAT Test Track: Interim Report

Abstract

Polymer-modified asphalt (PMA) can be used to improve pavement durability. An increase in polymer can increase the elasticity of the asphalt and increase resistance to cracking. However, an increase in polymer could also negatively affect workability and compaction. Kraton Performance Polymers, LLC has developed a high polymer content, 7-8%, PMA to combat fatigue and deformation. A test section at the National Center for Asphalt Technology (NCAT) Test Track was constructed to evaluate four mixtures: Kraton surface and base, and control surface and base. Laboratory and field testing included: deflection testing, dynamic modulus, beam fatigue testing, rutting susceptibility, resistance to deformation, resistance to cracking, moisture susceptibility, falling weight deflectometer testing, and pavement response measurements.