VALIDATION OF SHRP BINDER SPECIFICATION THROUGH MIX TESTING (WITH DISCUSSION)

Abstract

A critical element of the SHRP Asphalt Program was the validation of the proposed binder and mix tests using both laboratory and field data. Binder properties/tests were validated in parallel using both simulative laboratory tests and field performance data by the A-003A and A-005 contractors, respectively. A similar approach was used for validation of the mix tests. The discussion here is limited to the A-003A efforts associated with the validation of the A-002A binder tests/properties as they relate to the performance of asphalt-aggregate mixes. Specifically, this paper will address validation of the following: (1) Binder properties proposed by the A-002A contractor to predict asphalt-aggregate mix performance in terms of fatigue cracking, permanent deformation and low temperature cracking; (2) aging procedures proposed by the A-002A contractor that produce binder properties which are representative of those in a pavement immediately after construction (short-term) and after several years of service (long-term); and (3) the net adsorption test proposed by the A-003B contractor to predict moisture damage (stripping) in asphalt-aggregate mixes.