Road trials of scrap rubber modified bituminous surfacings laid in Victoria 1975-1977

Bituminous plant mix overlays containing scrap rubber granules have been proposed as a means of suppressing reflection cracking and providing better resistance to shoving at high traffic sites than conventional mixes. Early in 1977, the Country Roads Board of Victoria laid two trials to evaluate this type of mix. At the first and more heavily trafficked site, the overlay started to disintegrate shortly after laying due to stripping of the binder from the aggregate by the action of water and traffic. The conventional mix, laid as control, also failed in the same way ten months after laying. At the second, less heavily trafficked site, the experimental mixes showed only minor distress after nine months service. Premature failure of the material at the first site is thought to have been due to water being trapped in the overlay after exceptionally heavy rainfall which occurred shortly after laying and before the traffic had had time to 'seal' the surface by further compaction. During the last two years, bitumen scrap rubber seals (bsrs) have been laid by the CRB over cracked pavements and in high traffic stress situations. Up to 20 per cent by mass of fine granules of vulcanised scrap rubber has been incorporated in the bitumen binder and covered with 7 mm or 10 mm aggregate chips. The process shows promise, though considerable laboratory and field work is required to fully assess the variables involved and control the procedure. (A)

  • Record URL:
  • Corporate Authors:

    ARRB

    Melbourne, Victoria  Australia 
  • Authors:
    • Oliver, J W
    • Bethune, J D
  • Publication Date: 1978-2

Language

  • English

Media Info

  • Pagination: 18P
  • Serial:
    • Issue Number: AIR 286-1

Subject/Index Terms

Filing Info

  • Accession Number: 01440554
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 24 2012 11:02PM