The permanent deformation of bituminous surfacings known as tracking is due to traffic and environmental, climatic factors (external factors) on the one hand, and to the pavement structure and the mechanical characteristics of the pavement layers on the other (internal factors). Heavy channelized traffic (especially excess loads in relation to an already high legal permissible axle load) slow traffic speed, tangential forces (gradients, bends, junctions), and high temperatures are favourable to the occurrence of tracking. For given traffic and climatic conditions the resistance of bituminous surfacings to tracking is a function of structural geometry (hence necessity of a design taking into account permanent deformations), and the mechanical characteristics of the materials used in the pavement layers. The materials most exposed to the effects of traffic are surface materials, eg, surface bituminous mixtures. The mechanical properties of these materials are characterized by their modulus of deformation, their ultimate fatigue strength in alternate bending, and their resistance to permanent deformations under repetitive compressive stresses. Studies have shown the existence of laws between the composition of the material and its mechanical characteristics. From results of the application of these laws and from conclusions and recommendations put forward at the 13th Belgian road congress and an OECD working group, it was observed that a bituminous mixture resistant to tracking must contain a high-consistency binder with a low susceptibility to temperature; it must be characterized by a high aggregate/binder content ratio value and a low percentage of residual voids. Other aspects concern the manufacture and laying of mixtures with tests for evaluating the resistance of the mixtures to tracking. (TRRL)

  • Availability:
  • Corporate Authors:

    Association Permanente des Congres Belges de Route

    49 avenue d'Auderghem
    Brussels 4,   Belgium 
  • Authors:
    • Veverka, V
  • Publication Date: 1978


  • French

Media Info

  • Features: Figures; References;
  • Pagination: p. 3-19
  • Serial:
    • Technique Routiere
    • Volume: 23
    • Issue Number: 4
    • Publisher: Association Permanente des Congres Belges de Route
    • ISSN: 0040-1277

Subject/Index Terms

Filing Info

  • Accession Number: 00317043
  • Record Type: Publication
  • Source Agency: Centre de Recherches Routieres (CRR)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM