Laboratory Pavement Polishing Device (Wear Machine) vs. Field Friction Test Units. Phase I. Correlation Study.

摘要

During the past ten years,the Office of Materials and Research,Florida Department of Transportation,has been engaged in a rather extensive program of field and laboratory data collection pertaining to the safety of Florida's flexible highway pavements against vehicle skidding accidents. This comprehensive program has led into studies of aggregate qualities,bituminous mix designs,traffic wear and polishing characteristics;as well as corrective maintenance determinations and overlay scheduling wherever surfaces become dangerously slippery. Phase I of this program involved a laboratory and field evaluation to determine if a laboratory polishing device could be used to predict in situ friction values. This report covers the description,fabrication,and initial operation of the Florida Department of Transportation's Laboratory Pavement Polishing Device. This device was developed to expand Florida's skid resistance program by providing a laboratory method capable of determining aggregate wear with regard to asphalt concrete mixes. Results of this evaluation show a good correlation of wear numbers obtained with the Laboratory Pavement Polishing Device and field friction numbers obtained with the Friction Test Unit. Based on the favorable results in this report,Phase II will be initiated as a new HPR Study in an effort to determine the degree of polish that will occur when the pavement surfaces are subjected to varying traffic densities.