Application of fractal analysis for measuring the effects of rubber polishing on the friction of asphalt concrete mixtures

M. M. Villani, A. Scarpas, A. de Bondt, R. Khedoe, I. Artamendi

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Skid-resistance is one of the most important pavement surface properties with respect to driver safety. For example, the friction of asphalt concrete mixtures continuously evolves because the aggregates are subjected to polishing by rubber tires.Currently available tests for mix design optimization are focused primarily on evaluating the polishing characteristics of aggregate surfaces rather than actual AC mixtures. Factors such as aggregate gradation cannot directly be taken into account in aggregate polishing tests, and hence its effects on the friction of the overall mix are not accounted for when mixes are being designed.Using the Skid Resistance Interface Testing Device (SR-ITD®), developed for laboratory use during the European project SKIDSAFE, the evolving frictional properties of asphalt concrete mixes containing any desired combination of aggregate type, maximum size and gradation can be evaluated. The effects of the number of wheel passes and combinations of contact pressure and speed are documented.During SR-ITD testing, evolution of the surface morphology is recorded using a laser profilometer. Post-processing of the results by means of fractal analysis enables the characterization of the surface texture on the basis of three unique descriptors.By combining the variation of surface descriptors with the friction coefficient, the influence of aggregate type and gradation on the frictional response of asphalt concrete mixes can usefully be determined.

Original languageBritish English
Pages (from-to)179-188
Number of pages10
Issue number1
StatePublished - 5 Dec 2014


  • Aggregate
  • Asphalt concrete mixes
  • Fractal analysis
  • Friction coefficient
  • Surface polishing


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