Polish value and 5-cycle magnesium sulfate soundness are the primary quality requirements in current Texas Department of Transportation (TxDOT) specifications for bituminous coarse aggregate sources in two critical categories - (I) aggregates with high polish value but poor skid performance, and (II) aggregates with low polish value but good performance. This report summarizes the background and deficiencies of the current polish value specification and test procedures.

Two key areas are addressed in this review: (1) a review and upgrade of the Aggregate Quality Monitoring Program (AQMP) and (2) a review and upgrade of the proposed Surface Aggregate Classification System. The assessment of the AQMP includes evaluation of other tests that might be required as replacements and/or supplements for the tests currently used to monitor quality. The study also includes an assessment of the frequency and protocol of testing and suggests changes where necessary.