CATERING FOR LONG TERM CHANGES IN THE CHARACTERISTICS OF ASPHALT DURING THE DESIGN LIFE OF A PAVEMENT. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN

Asphalt is subject to aging. This causes hardening and volume change of the binder during the life cycle of a pavement. Both phenomena have already been extensively studied. However, with respect to the influence of these phenomena, certain aspects required investigation. A laboratory procedure for simulating the aging process was used to evaluate the variation in the engineering parameters of the asphalt during the life cycle of a pavement. Typical South African continuously and gap-graded asphalt mixes were tested. The engineering characteristics were determined for aged and unaged asphaltic mixtures at low, medium and high temperatures, that is at -5 deg C, 25 deg C and 40 deg C. By using elastic layered theory in conjunction with the analysis of stresses due to rapid cooling down of the asphalt layers it was confirmed that thin asphalt layers as used in South Africa would be prone to cracking under particular environmental conditions. This was found to be both load and non-load associated as well as due to the interaction of the law. In an attempt to validate previous findings and hypotheses a full-scale pilot study on experimental pavements is being carried out using a Heavy Vehicle Simulator in conjunction with a temperature chamber capable of varying the pavement temperature between -10 deg C and 50 deg C. Results obtained to date have shown that the design of asphalt pavements should take into account the fact that the engineering parameters which influence the structural behaviour of such pavements, are subject to environmental influences.

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Civil Engineering
    Ann Arbor, MI  United States  48109
  • Authors:
    • Hugo, F
  • Publication Date: 1987

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  • Accession Number: 00485493
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 31 1989 12:00AM