Accelerated load testing of unsealed and reinforced pavements

In order to assess the potential of geosynthetics as reinforcements in unsealed roads, 16 pavement sections incorporating a variety of geosynthetics, natural reinforcement or no enhancing inclusion were constructed and subjected to accelerated trafficking. This was applied using a driven truck over a closed loop circuit at a soft clay experimental site. Pavement response is described both in terms of resilient stress and strain measurement from insitu instrumentation and in terms of permanent deformation at the surface and in the pavement. It is shown that the overall response is controlled by the granular material to a much greater extent than is often considered. Internal strain measurements indicated that the irrecoverable deformation response mechanism over the soft subgrade is one in which aggregate, loaded by the wheel, acts in outward shear from the wheel path towards the centre and margins of the pavement. This mechanism has not generally been considered as important in most design methods, so its significance is discussed. It is concluded that the position and type of reinforcement and the quality of the aggregate must be considered within an appropriate mechanistic approach if design analysis is to be successful. As the pavements were subjected to both 80 and 125 kN axle loads, in sequence, it was possible to deduce power law equivalencies for the different sections. The results were highly variable suggesting that a power law equivalency approach may not be appropriate for this kind of pavement

Language

  • English

Media Info

  • Pagination: 20p
  • Monograph Title: Full scale accelerated pavement testing: a southern hemisphere and Asian perspective

Subject/Index Terms

Filing Info

  • Accession Number: 01389242
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 23 2012 3:16AM