Identification of laboratory techniques to optimize Superpave HMA surface friction characteristics : final report, April 2010.
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2010-04-15
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Abstract:Wet pavement friction is known to be one of the most important roadway safety parameters. In this
research, frictional properties of flexible (asphalt) pavements were investigated.
As a part of this study, a laboratory device to polish asphalt specimens was refined and a procedure to
evaluate mixture frictional properties was proposed. Following this procedure, 46 different Superpave
mixtures, one stone matrix asphalt (SMA) mixture and one porous friction course (PFC) mixture were tested.
In addition, 23 different asphalt and two concrete field sections were also tested for friction and noise.
The results of both field and laboratory measurements were used to develop an International Friction Index
(IFI)-based protocol for measurement of the frictional characteristics of asphalt pavements for laboratory
friction measurements.
Based on the results of the study, it appears the content of high friction aggregate should be 20% or more of
the total aggregate blend when used with other, polish susceptible coarse aggregates; the frictional properties
increased substantially as the friction aggregate content increased above 20%. Both steel slag and quartzite
were found to improve the frictional properties of the blend, though steel slag had a lower polishing rate. In
general, mixes containing soft limestone demonstrated lower friction values than comparable mixes with hard
limestone or dolomite.
Larger nominal maximum aggregate size mixes had better overall frictional performance than smaller
sized mixes. In addition, mixes with higher fineness moduli generally had higher macrotexture and friction.
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