An improved asphalt mix for residential streets

In 1977 a group of local government engineers asked the Australian Road Research Board (ARRB) to investigate the reason for the short lives of asphalt surfacings placed on residential streets. A survey of lightly trafficked, residential streets identified lack of compaction, leading to rapid binder hardening through oxidation, as the main reason for short service lives. Work was undertaken on the design of mixes which would have low air void contents at construction and thus not require traffic compaction to achieve adequate density. A road trial to evaluate these mixes was placed in Camberwell, Victoria in 1981. An inspection of the trial in 1991 showed that all the mixes were generally in good condition with considerable life remaining. The conventionally graded mixes were showing signs of aggregate loss but the gap-graded one was not. Testing of cores showed that the gap-graded mix had hardened only on the surface and the bitumen in the interior was still at laying viscosity. The binder in the conventionally graded mixes had hardened considerably. The results suggest that gap-graded mixes may be able to achieve extended service lives of the order of thirty to forty years.


  • English

Media Info

  • Pagination: 297-301
  • Serial:
    • Issue Number: 93/5

Subject/Index Terms

Filing Info

  • Accession Number: 01433834
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0858255758
  • Files: ATRI
  • Created Date: Aug 24 2012 5:54PM