Characterisation of natural bauxite materials for use in remote sealed road pavements in Australia

Design and construction of sealed road pavements in remote Australia has always been challenging to the geotechnical and pavement engineers. This paper presents a case study on design and construction of a 40km sealed road in a remote area in the north-eastern part of Australia with annual rainfall of more than 1200mm. This road was designed for movements of off-road vehicles with wheel loads of up to 18T. Natural bauxite had been the only gravel materials that was available in the close vicinity of this road. Information on use of natural bauxite materials in heavy duty sealed pavements was not available during design stage. Extensive geotechnical investigation was carried out to assess the strength and expansive potential of subgrade and potential sources of natural bauxite gravel materials. Geotechnical investigation comprised excavation of test pits and laboratory testing that included conventional classification and strength tests. Repeated load triaxial tests were carried out to assess resilient modulus of the material to be used in basecourse. Pavement thickness design was carried out using elastic layer analysis method. Sprayed bituminous surfacing comprised prime followed by application of a double/double seal using polymer modified binder. Geotechnical investigation, design of pavements and bituminous surfacing has been described in detail in this paper.

Language

  • English

Media Info

  • Pagination: 985-9
  • Monograph Title: Proceedings of the 13th Australia New Zealand Conference on Geomechanics Perth, Western Australia, 1-3 April, 2019

Subject/Index Terms

Filing Info

  • Accession Number: 01714798
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • ISBN: 9780994626103
  • Files: ITRD, ATRI
  • Created Date: Aug 26 2019 11:51AM