The background and evolution of chip seal design is discussed in this paper. Overseas literature and design methods are reviewed. Experimental work (including 50 test sections since 1990) which has been implemented to further the development of chip seal coat design, construction techniques,and specialised materials suited to the special requirements of forestry roads sustaining heavy loads, is described and discussed. The aim of the research is to closely monitor the performance of the chip seals under theheavy axle loads over time, and establish the optimum application rates and polymer content for the conditions. Sealing practices, especially withrespect to bitumen and stone chip application rates, additions of cutbackdiluent, and adhesion agent, require supervision and equipment able to readily comply with the more rigorous requirements. Observations of field trials have shown that enhanced quality control during construction, reduced application rates of bitumen, and use of polymer-modified bitumens may provide the required performance, but no firm conclusions will be availableuntil the trials have undergone a number of years in service. (a) For the covering entry for this conference see IRRD abstract no 861445.


  • English

Media Info

  • Features: References;
  • Pagination: p. 181-6

Subject/Index Terms

Filing Info

  • Accession Number: 00674637
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0-478-04149-7
  • Files: ITRD, ATRI
  • Created Date: Mar 8 1995 12:00AM