Direct measurement of the cohesion of bitumen is very difficult. Cohesion depends on many factors, the most important of which is temperature. Bitumen is a thermoplastic material: liquid at high temperatures, viscoelastic at usable temperatures, and solid at low temperatures. Therefore in practice other values are usually measured, on which cohesion has a significant effect. However, none of these methods are convincing enough to be introduced generally. After a brief survey of methods often mentioned in the literature, the author reports on some considerations and tests, and arrives at a method which enables the cohesion to be measured at a temperature at which all bitumens have the same penetration and the same viscosity. This temperature is called the "equi-penetration temperature". Moreover the concept of cohesiveness is introduced, which the author understands more comprehensively than that of cohesion in the purely physical sense. Finally the apparatus with which the cohesiveness is measured is described, and the results of the tests carried out are discussed.

  • Corporate Authors:

    Verlag fuer Publizataet

    Auf der heide 20
    300 Isernhagen HB, Hannover,   Germany 
  • Authors:
    • Stahl, J
  • Publication Date: 1972-7


  • German

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00265585
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM