STE. ANNE TEST ROAD--FLEXIBLE PAVEMENT DESIGN TO RESIST LOW TEMPERATURE CRACKING

Low temperature transverse cracking of bituminous pavements is a form of pavement distress prevalent in Canada and the northern United States. This distress induces a deterioration in pavement performance through spalling, heaving or settling at the cracks and reduces pavement service life. In 1967, a test road, designed and instrumented for the investigation of this problem, was constructed at Ste. Anne, Manitoba. This road incorporated twenty-nine test sections involving a number of different bituminous mix materials, pavement structures and subgrade types, believed to be potentially important in the study of transverse cracking. After five years of service, the following conclusions can be drawn with respect to the relative performance of the test sections: (1) Pavements incorporating high viscosity type asphalts and softer grade asphalts exhibit a greater resistance to transverse cracking. (3) The type of subgrade influences the frequency of transverse cracking. (4) The asphalt content of the mix, in the range of one percent below Marshall optimum to one-half percent above Marshall optimum does not appear to be significant in affecting pavement transverse cracking frequency. A laboratory study was conducted in conjunction with the field programme to investigate the possibility of correlating laboratory predicted fracture temperatures with the actual field performance of the St. Anne test sections. Predicted fracture temperatures were determined by calculating that temperature at which accumulated thermal stresses exceed the tensile strength of the compacted mix. Additionally since the tensile properties of an asphalt bunder are proportional to the tensile properties of a mix made with that binder, the possibility of predicting pavement field performance by a knowledge of binder properties alone was investigated. Accumulated thermal stresses of the binders and their mixes were calculated from their respective stiffness moduli at one-half hour loading time (cooling rate) over the appropriate temperature range. Accumulated thermal stress and breaking stress (tensile strength) were plotted as a function of temperature. The predicted fracture temperature is the intercept of these curves. Comparison of the laboratory and field results revealed that there is an excellent correlation between the laboratory predicted fracture temperatures of the binder and mix and the temperature of initial cracking of the asphaltic pavement in the field. For practical purposes, therefore, the tendency of an asphaltic pavement to crack can be predicted by a knowledge of the binder stiffness modulus at low temperatures and long loading time. Conversely, the binder, or mix, stiffness parameter may be used as a pavement design criterion to alleviate the transverse cracking problem. These research findings would also imply that it is necessary to be more selective in the use of materials and pavement designs with due consideration being given to their performance under the prevailing climatic conditions. /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:
    • Burgess, R A
    • Kopvillem, O
    • Young, F D
  • Conference:
  • Publication Date: 1972-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 27-40
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00261975
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM