THE BEHAVIOR OF BITUMINOUS MIXTURES IN LABORATORY TESTS AND UNDER ROAD CONDITIONS.

The fatigue behavior, the expansibility and the stiffness of bituminous mixtures are important parameters for the dimensioning of road structures. After work of about five years informative values for the various bituminous mixtures can be given. The determination of flexibility in the fatigue test has remained problematic. Not sufficiently known are the effects of the frequency of load cycles and the influence of the intervals between the load cycles. As long as these influence are not exactly studied it is recommended to test the fatigue of bituminous mixtures with frequencies of at most 10. c.p.s. (Hz). Moreover, it was found that the results of fatigue tests with constant deformation amplitude are in better agreement with the field conditions than the results of fatigue tests with constant power amplitude. The determination of flexibility in the fatigue test generally requires much time and work. It was for this reason that in parallel with the fatigue tests the stress and strain were determined in axial tensile tests. As can be concluded from the results obtained so far there exists a close connection between the flexibility in the fatigue test (i.e. number of load cycles until rupture at a given deformation) and of the expansibility in the axial tensile test. The axial expansibility at low temperatures is, moreover, an important parameter with a view to the danger of the formation of cracks due to cooling in bituminous road surfacings. In parallel with the laboratory test the behavior of road pavements under standing and rolling loads has been investigated. In this connection the determination of the radius of curvature of the deformation through has proved particularly effective and informative. The curvature meters developed by Franz MULLER gives exact and excellently reproducible measured values, it is smaller and easier to handle than the BENKELMAN beam. One measurement takes only one or few minutes. /AUTHOR/

  • Supplemental Notes:
    • Presented at the Third International Conference on the Structural Design of Asphalt Pavements, Grosvenor House, Park Lane, London, England, Sept. 11-15, 1972.
  • Corporate Authors:

    International Conf Struct Design Asph Pvmts (3rd)

    University of Michigan, Department of Civil Engineering
    Ann Arbor, MI  United States  48104

    International Conf Struct Design Asph Pvmts (3rd)

    University of Michigan, Department of Divil Engineering
    Ann Arbor, MI  United States  48104

    Interrational Conf Struct Design Asph Pvmts (3rd)

    University of Michigan, Department of Civil Engineering
    Ann Arbor, MI  United States  48104
  • Authors:
    • GUERICKE, R
    • Weinert, F
  • Conference:
  • Publication Date: 1972-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 233-240
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00261954
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM