Incorporating heavy vehicles into seal designs

The foremost challenge facing spray seal designers and practitioners is the performance of sprayed seals under the increasing numbers of large heavy vehicles on major transportation routes connecting capital cities and in rural areas, particularly in Australia. The objective of this paper is twofold. Firstly, the loadings permitted on single, tandem and triaxle groupings have been calculated such that the multiple axles cause the same damage as the more lightly loaded single axles. This is based on pavement theory. However, do these axle groupings and loadings that cause the same damage to a pavement, cause different damage to a sprayed seal? Would one triaxle cause the same spray seal wear as a single axle? If not, should the increase in multiple axles influence the way that heavy vehicles are accounted for in the seal design process? The paper investigates these questions by analysing data obtained under the Australian Accelerated Loading Facility. Secondly, it would be simple for seal designers if the pavement design concept of ESAs could be input into heavy-vehicle seal design. The concept of ESAs is interconnected with the 4th power law, which has been variously derived with definitions of pavement damage such as vertical elastic deformation (Benkelman beam), plastic deformation (rutting) and a pavement serviceability index (roughness). Vertical elastic deflection, rutting and roughness are not typical failure modes for sprayed seals or chip seals. Does a load damage exponent of 4 apply to sprayed seal wear? Should it be 3.1 or 2.0?

Language

  • English

Media Info

  • Pagination: 8p
  • Monograph Title: 11th Conference on Asphalt Pavements for Southern Africa: CAPSA15, 16-19 August 2015, Sun City, South Africa

Subject/Index Terms

Filing Info

  • Accession Number: 01597071
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:12AM