United States Department of Transportation
i
Evaluation of LADOTD Aggregate Friction Rating Table by Field Measurements
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2016-01-01
[PDF-2.35 MB]
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TRIS Online Accession Number:01596766
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Edition:Final Report
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Abstract:The objective of this research was to evaluate the current DOTD coarse aggregate friction rating table and provide recommendations for the frictional mix design guidelines based on a new set of laboratory friction measurement devices. Twenty-two asphalt pavement test sections (each of 1000-ft. long) were selected for this study. The wearing course mixtures of the selected pavement sections contained eight DOTD commonly-used aggregate sources and four typical mix types: 12.5-mm and 19-mm Superpave, Stone Matrix Asphalt (SMA) and Open Graded Friction Course (OGFC). Field tests were carried out to collect the pavement surface friction and texture data, which included the measurements from a locked-wheel skid trailer at different sliding speeds (30-, 40- and 50- mph) using both ribbed and smooth tires, laser profiler, Dynamic Friction Tester (DFT), and Circular Track Meter (CTMeter) tests at the beginning, mid-point, and end on each 1000-ft. long test section selected. In addition, multi-year field skid number measurements were also retrieved from the DOTD PMS database and included in the analysis of this study. The collected data and measurements were used to perform comprehensive statistical analyses of the influence of aggregate properties and mixture design on skid resistance value and its variability. Statistical correlation models were developed among different measurement devices as well as various surface texture and frictional properties. Consequently, the analysis results led to the development of a procedure for predicting pavement end-of-life skid resistance based on the design traffic, aggregate blend polish stone value and gradation parameters. The developed friction prediction procedure can be used to update the current DOTD coarse aggregate friction table by specifying the pavement friction requirements under different traffic levels through selection of different mixture and aggregate types. Moreover, the DFT and CTM measurements observed on field pavement surfaces of this study were compared with those measured on laboratory prepared slab surfaces obtained in the LTRC Project 09-2B. Finally, a benchmark DFT rating table based on the traffic level and mixture type was proposed for the DFT20 value after 100,000 polishing cycles, which can be used to evaluate the friction resistance of the new aggregate sources to be certified by DOTD. 17. Key Words 18.
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