United States Department of Transportation
i
Friction management on Kansas Department of Transportation highways : technical summary.
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2017-04-01
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Abstract:The objectives of this study are to evaluate the performance of a local aggregate in HFST and to evaluate
the 3-dimensional laser profiler for measuring pavement texture. Slab specimens of hot-mix asphalt
(HMA) were compacted in the laboratory and treated with HFST systems incorporating both calcined
bauxite and a local, hard flint aggregate from Picher, Oklahoma. The treated HMA specimens were
then tested with a Dynamic Friction Tester (DFT) and a Circular Track Meter (CTM) to determine the
frictional coefficient and texture depth, respectively. Also, Hamburg Wheel Tracking Device tests were
conducted on these HFST systems to evaluate wearing resistance under repetitive wheel load. Field
measurements of texture depths on HFST were also done. Statistical analysis was performed to compare
the performance of high friction surfaces prepared with different aggregate epoxy combinations.
The results show that flint aggregate can be a suitable substitute for the calcined bauxite in HFST.
Field measurements also showed marked improvements in texture depth with HFST. Texture depth and
skid number determined by the ASTM skid trailer vary with pavement surface types and treatments.
Mean Texture Depth (MTD) of high friction surface treatment is generally greater than 1 mm. A good
correlation between skid number and MTD was found for the MTD range of 0.5 to 1.5 mm.
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