In a previous JTRP project published in 2010, Identification of Laboratory Techniques to Optimize Superpave HMA Surface Friction Characteristics, a laboratory procedure to polish and test the frictional properties of asphalt mixtures was developed. Subsequently, the procedure has been used in other research efforts to evaluate the frictional properties of recycled asphalt pavement (RAP) and local (possibly marginal) aggregate blends and for other testing purposes. Most notably, the procedure has been developed into Indiana Test Method (ITM) 221, “Acceptance Procedures for HMA Surface Mixture Coarse Aggregates for ESAL ≥ 10,000,000.” The method requires compaction, polishing and testing of 500 mm by 500 mm (20 in. by 20 in.) square slabs of asphalt mix. This research project was initiated based to explore the possibility of expanding use of the lab polishing/testing procedure to test gyratory specimens or field cores. It was envisioned that such a method could be used during mix design as a check on potential frictional properties and/or as a quality acceptance test. A means of fabricating a circular test ring from seven cylindrical specimens was developed and used to test five different plant produced mixtures. Comparisons of ITM 221 slabs, gyratory specimens compacted to different air void contents and field cores showed cylindrical specimens could yield similar results to the accepted slab test method.

Report Number



friction, asphalt, performance test

SPR Number


Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, Indiana

Date of this Version