MODULI AND CRITICAL STRAINS IN REPEATED BENDING OF BITUMINOUS MIXES-APPLICATION TO PAVEMENT DESIGN

The purpose of this paper is to present results concerning moduli and fatigue strength of bituminous mixes tested in sinusoidal beinding (controlled stress tests) with a view to their use in pavement design. The 27 mixes differ by their composition and by the type of bitumen. The data indicate that the apparent activation energy relation (Arrhenius equation) may be used to evaluate the frequency and temperature dependent response of bituminous mixes. It is also important to note that the apparent activation energy is approximately the same for all the mixes investigated (46kcal/mole). It is also established that, within the limits of the mixes investigated, there exists a general relation between the ratio E/Vsuba (ratio between the modulus of the mix and the percentage volume of aggregate in the mix, voids included) and the product Esubb x y (product of the corresponding modulus of the bitumen and a factor which depends on the penetration of the bitumen). The interest of such a relation is to permit, for practical purposes, to estimate the values of the modulus E of a mix knowing its composition, the corresponding modulus Esubb and the penetration of the bitumen. For the fatigue strength in bending it is established that the critical strain for a given number N of cycles depends principally on the percentage volume of bitumen in the mix (voids included) and also on the asphaltene content of the bitumen and the kind of stones. As found previously critical strain practically independent of temperature and frequency. On the basis of these results and therefore within the limits of the mixes investigated a general formulation of the fatigue law of bituminous mixes is given and the statistical aspect of the phenomena is taken into consideration for the application of this law. It is also concluded that in practice the choice of a composition must be made in the general frame of the road conception and not only on the basis of a single property. /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  USA  48104

    International Conf Struct Design Asph Pvmts (3rd)

    University of Michigan, Department of Divil Engineering
    Ann Arbor, MI  USA  48104

    Interrational Conf Struct Design Asph Pvmts (3rd)

    University of Michigan, Department of Civil Engineering
    Ann Arbor, MI  USA  48104
  • Authors:
    • VERSTRAETEN, J
  • Conference:
  • Publication Date: 1972-9

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 729-738
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00261967
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM