THE QUESTION OF OPTIMAL FILLER CONTENT IN HOT ROLLED ASPHALT SURFACING

ZUR FRAGE OPTIMALER FUELLERGEHALTE IN ASPHALTBETONDECKSCHICHTEN

The stability of rolled asphalt can be influenced by the quantity and quality of the mortar. The author considers mortar to be the mixture of filler and bitumen. The percentage by volume of the mortar must always remain less than the void in the crushed stone-sand-mixture in order to prevent the occurrence of isotropic stress conditions in the mortar and thereby assure stability. The mortar becomes stiffer with stronger filling; nevertheless by the use of bitumen 80 in hot rolled asphalt mortar, the highest softening point is reached at 70 deg C, using the ring and ball test, whilst gussasphalt mortar has a similar softening point between 110 and 130 deg C. During summer temperatures of 50 deg C there is therefore a difference in viscosity between gussasphalt mortar and rolled asphalt mortar of more than 1000:1, which affects the stability of gussasphalt in spite of the absence of voids in practical terms. As a result of tests for creep it is evident that rolled asphalt mixes having high filler and low void content exhibit comparatively low rigidity, which points to less stability. (TRRL)

  • Corporate Authors:

    Wesel (FW)

    Rheinstrasse 219, Postfach 1110
    7570 Baden-Baden,   Germany 
  • Authors:
    • Peffekoven, W
  • Publication Date: 1979-10

Language

  • German

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 7-10
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00325139
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM