STABLE BITUMEN/ADDITIVE MIXES

STANDFESTE BITUMEN/ADDITIV-GEMISCHE

The author reports on the behaviour of bitumen from various sources with penetrations 20/30, 40/50, 60/80 to which had been added a copolymer of styrol, butadiene and unsaturated organic dicarboxylic acid (e.g. moleic acid) in emulsified form. The additive was applied as a 50% aqueous emulsion (latex) with ph=8, a density of 0.98-1.02 g/cm 3 and a Brookfield viscosity at 20 rpm of more than 500 cst. It showed a good mechanical and chemical stability and was specially formulated to prevent premature fracture. The emulsified elastomer could be heated to almost 160 deg C without its qualities being changed. The optimum quantity of the additive was estimated to be 4%. The results of the laboratory tests and the investigations carried out on the experimental lengths of the national road 1 using hot rolled asphalt wearing surface having 4% elastomer additive show that the surfacing is less liable to plastic deformation. This statement is also borne out by the Marshall- and gyratory-test results. It appears that the preparation and compaction of mixes using elastomer modified binders requires the corresponding temperature to be raised by 10 - 15 deg C. /TRRL/

  • Corporate Authors:

    E.W. Wesel

    Rheinstrasse 219, Postfach 1110
    7570 Baden-Baden,   Germany 
  • Authors:
    • Munoz, JLE
  • Publication Date: 1977-9

Language

  • German

Media Info

  • Features: Figures;
  • Pagination: p. 191-4
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00195029
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1979 12:00AM