During the manufacture of tar mixtures care should be taken that the prescribed maximum temperatures are observed during immersion in binder, during the drying and heating of the aggregate, and during the mixing. In order to keep modifications caused by heating to a minimum, and to restrict odors, it is recommended that a highly viscous tar and soft types of bitumen be used in the preparation of the mixtures. If the binder components are mixed in separately, the tar should be put in first as this increases adhesion strength. The test procedures described in DRN 1995 are criticized as being in need of improvement, especially as regards the quantitative determination of the two components. Attention is drawn to the amount of compaction needed if laying takes place in cold weather. Measurements of the coefficients of friction of experimental surfacings have shown that bitumen-tar and tar-concrete mixtures provide a durable rough surfacing. Mention is made of the use of tar modified with polyvinyl chloride for surfacings and surface dressings. /TRRL/

  • Corporate Authors:

    Teerbau GmbH

    Ruettenscheider Strasse 66
    D-4300 Essen,   Germany 
  • Authors:
    • Deters, R
  • Publication Date: 1971


  • German

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00081925
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 13 1975 12:00AM