In the outlined design procedure the flexible pavement structure is consided as a linearly elastic multi layer system in which the road building materials are characterized by Young's modulus and Poisson's ratio. By aid of the computer programs BISTRO and BISAR, developed by Shell, the maximum stresses at the interfaces of the layers were determined. The primary criteria for the behaviour of the asphalt layer has been found to be the main shear stress at the bottom of this layer. The stressing of the unbound base courses and of the subgrade can be evaluated by the compressive stress. The Young's modulus has been determined in shear tests in subjection to temperature and loading time, whereas the parameters--gain shape, binder hardness, binder content and void content--have been varied. With the same test equipment also the fatigue under shear stressing has been investigated; the paper presents the influence of the different parameters. In this paper an example of designing a new pavement construction with an insulation layer out of hard foam is given. It is expected that this design method can be improved by the results of the test track "Hilpoltstein"; in a theoretical study statements have been given on the service life of this temporary by-pass which shall be compared with the real behaviour. /Author/

Media Info

  • Features: Figures; References;
  • Pagination: p. 342-352

Subject/Index Terms

Filing Info

  • Accession Number: 00170221
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Mar 14 1978 12:00AM