Modification of mechanistic-empirical pavement design method to incorporate the influence of hexagonal stabilisation geogrids

The typical geogrid application in pavements is to use them in lower layers to improve weak soil bearing capacity. Usually the influence of geogrid is not considered in the pavement design itself. Tests conducted in recent years, including full scale accelerated pavement tests, have confirmed that the proper type of stabilisation geogrid placed in aggregate base/sub-base can have a significant influence on pavement life. The influence of a geogrid can be utilised in different ways. First, it allows for reduction of thickness of pavement layers (including asphalt) while maintaining required life. Second, if pavement thickness remains unchanged, it allows for substantial increase of pavement life. Third, is a combination of both. This is often referred to as “Pavement Optimisation”. In the US, this approach is covered by AASHTO R50-09 “Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures” standard. One of the requirements of this standard is the necessity to conduct full scale pavement tests to allow for quantification of the geosynthetic benefit. Extensive testing of stabilisation hexagonal geogrids has been conducted using a HVS (Heavy Vehicle Simulator) device. This has enabled a modification to be developed of the M-E pavement design method. The modified method uses aggregate modulus enhancement and pavement life shift factors.


  • English

Media Info

  • Pagination: 15p
  • Monograph Title: Our everlasting roads – enabling future mobility: 18th AAPA International Flexible Pavements Conference and Exhibition, 18-21 August 2019, Sydney

Subject/Index Terms

Filing Info

  • Accession Number: 01718282
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Files: ITRD, ATRI
  • Created Date: Sep 26 2019 12:33PM