Recommendations for Achieving Adequate Surface Friction and Predicting Skid Values in Class P Concrete Containing Manufactured Fine Aggregates

This report summarizes findings and recommendations regarding the usage of manufactured fine aggregates in portland cement concrete pavement (PCCP). The supporting research included both field and laboratory testing of aggregates and concrete properties that relate to skid resistance. Results show good correlation between friction values obtained using a Dynamic Friction Tester (DFT) and the micro-Deval test for fine aggregates (ASTM D7428). After comparing skid trailer values with Circular Track Meter (CTM) and DFT values, a correlation between the skid trailer and the DFT was established. Recommendations on how to blend carbonate sands with low acid insoluble residues to achieve good friction are presented in chapter 1 of this document. In chapter 2, a model for estimating skid numbers on concrete pavements with a mortar surface finish is presented.