Towards the use of crumb rubber modified asphalt for local government roads

Governments are continually seeking practical measures to address the increasing burden of both domestic and industrial waste streams. End of life tyres are one such waste stream that presents a considerable challenge locally. While crumb rubber modified binders in spray seals have been utilised in Australia since the 1970’s, more recent research focus and initiatives to incorporate their use in asphalt have focused on niche applications such as open or gap graded mixtures. Comparatively little research attention has addressed dense graded mixtures for local government roads, and local access roads in particular. Over the past 12 months, Brisbane City Council has begun to examine the potential for adoption of crumb rubber modified pavements for use in such environments where the predominant failure and deterioration mode is primarily due to environmental ageing effects. It is anticipated that the enhanced durability and anti-ageing properties of crumb rubber modified asphalt may provide enhanced pavement life in these applications. This paper presents Council’s initial investigative works towards the use of crumb rubber modified asphalts in their road network. Laboratory works to date have focused on volumetric impacts of a Council Type 2 mixture, a 10mm nominal size light duty dense graded asphalt traditionally incorporating C170 binder. Additional commentary as to Council’s research focus for asphalt designs utilising varying crumb rubber proportions is also provided, including proposed simulated ageing methodologies to validate any potential anti-ageing benefits.

• Record URL:
  http://arrbknowledge.com
• Record URL:
  https://www.afpa.asn.au/wp-content/uploads/2021/08/Symposium-Papers-document-v1-.pdf
• Authors:
  • Kidd, A
  • Stephenson, G
  • White, G
• Conference:
  • AfPA International Flexible Pavements Symposium, 2021, Melbourne, Victoria, Australia
• Publication Date: 2021-8

Media Info

• Pagination: 15p
• Monograph Title: Roads going full circle: AfPA 2021 International Flexible Pavments Symposium, 3-8 August, 2021

Subject/Index Terms

• TRT Terms: Aging (Materials); Bitumen; Bituminous pavements; Crumb rubber; Durability; Laboratory tests; Local government; Mix design; Pavements; Rubber; Test procedures
• Geographic Terms: Australia; Queensland
• ATRI Terms: Ageing; Asphalt; Bituminous pavement; Crumb rubber; Durability; Laboratory test; Local government; Mix design
• ITRD Terms: 5292: Ageing; LOCAL AUTHORITY
• Subject Areas: Pavements; I22: Design of Pavements, Railways and Guideways; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01784372
• Record Type: Publication
• Source Agency: ARRB Group Limited
• Files: ITRD, ATRI
• Created Date: Oct 7 2021 4:31PM