ABSTRACT
ABSTRACT: This paper presents how the agent, Caltrans, applies the four-point bending beam fatigue test results to develop statistically-based fatigue performance specification and determine the fatigue model parameters for each material used, and how these results are used to assist in the rehabilitation design and construction of a long-life pavement structure in Northern California. The asphalt mixes considered for use in rehabilitating the existing pavement consisted of three layers of hot mix asphalt comprised of PG64-28PM (polymer-modified) in the surface course, PG64-10 (25%) RAP (recycled asphalt pavement) in the middle layer, and PG64-10 RB (rich bottom) in the bottom layer; all produced with lime-treated aggregates. The fatigue test results were subsequently integrated into the database, together with the other material properties and used to determine the required layer thicknesses using the California Mechanistic-Empirical (CalME) pavement design program. Test results along with the specification developed for this project are presented.
