The Road Research Group on "Resistance of Bituminous Pavements to Plastic Deformation under Heavy Traffic" was established to study the present state of the art as regards permanent, vertical and horizontal, deformation of bituminous mixtures, under the effect of heavy traffic conditions, with particular emphasis on damage to upper pavement layers. Rut formation is a problem especially in countries with a hot climate, broken terrain and very heavy traffic. The report summarizes the information gathered on the importance given to the general problem of the plastic deformation of bituminous mixtures and to the specific problem of rut formation in the countries represented in the Research Group. It also contains a summary of failure criteria and rut measurement methods. The report lists the external factors, i.e. other than those pertaining to the pavement, having an effect on the appearance of plastic deformations and which concern in particular the nature of traffic and the environmental conditions of the road. It then examines the mechanical characteristics of bituminous mixtures and the pavement structure affecting the risk of plastic deformations and indicates how the rut depth may be theoretically calculated. The report presents a critical examination of the different tests used in order to predict the resistance to plastic deformations of the different bituminous mixtures. It then reviews the various bituminous materials used in different countries, classifies them, compares their specifications and indicates what changes could be made in their formulation in order to improve their resistance to plastic deformations. It describes finally the special precautions which have to be taken during the production and laying of these improved mixtures and mentions the methods used for repairing pavements with ruts which are due to a poor stability of the bituminous courses laid. It examines the economic consequences of using insufficiently stable materials, and discusses the economic implications of measures concerning heavy vehicles in view of the damage caused to pavements. The report concludes with some recommendations concerning the composition of bituminous materials and future research to be undertaken.

  • Corporate Authors:

    Organisation for Economic Co-operation and Development (OECD)

    2, rue André Pascal
    Paris,   France  75775 Paris Cedex 16
  • Publication Date: 1975-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 122 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00128600
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 21 1976 12:00AM