TESTS RELATING TO THE MODIFICATION OF BITUMEN WITH POLYMERS

UNTERSUCHUNGEN ZUR MODIFIZIERUNG VON BITUMEN MIT POLYMEREN

Bitumen can only be used in its plastic range which is limited by brittleness at lower temperatures and by plastic deformation under load at higher temperatures. Mixtures with nearly all polymers have been produced and tested. The author describes a series of laboratory tests to study the rheological behaviour of mixes containing 27 polymers which were thermoplastics, unvulcanised rubbers and thermoplastic rubbers. Bitumen modification is essentially a mixing problem and depends upon the ability of the dispersing agent or malthenes to act as swelling agents and solvents for the polymer. Longer mixing times and/or higher temperatures are required with polymers of high molecular weight. All polymers increase the upper temperature range but an extension of the lower temperature range is only possible with elastomer crude materials such as thermoplastic elastomers. A parallel upward shift of the viscosity/temperature curve is produced by most polymers. The shear rate effect decreases with increasing temperature. It appears that the percentage change in penetration increases with an increase in malthenes/asphaltenes rates. The reverse was true for a reduction of the aromatic character of both the malthenes and asphaltenes. This paper was originally published in German in Bitumen, (1989), 51(3) pp 108-111, and for the German abstract see IRRD 322056.

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • Kopsch, H
  • Publication Date: 1989-10

Language

  • English

Media Info

  • Pagination: 10 p.
  • Serial:
    • Issue Number: T 35

Subject/Index Terms

Filing Info

  • Accession Number: 00606984
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: 79
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM