Cost effective design of asphalt pavements at Queensland pavement temperatures: Year 6 (2019/2020)

Full depth asphalt pavements are the preferred pavement type for heavily trafficked urban roads throughout Queensland. The structural design of these pavements is sensitive to the road’s operating environment, particularly pavement temperature and heavy vehicle speeds. Current asphalt pavement design models in Australia predict increased fatigue damage with an increase in temperature (or decrease in the speed of loading). This has resulted in asphalt thicknesses in excess of 400 mm on some roads in Queensland, which is not considered to be sustainable. The National Asset Centre of Excellence (NACOE) has embarked on a multi-year study (P10 – Cost effective design of asphalt pavements and Queensland temperatures) to optimise the design and construction of asphalt pavements for the Queensland environment, particularly at elevated pavement temperatures. To date, the study has facilitated the introduction of Enrobés à Module Elevé Class 2 (EME2) asphalt on the Queensland Department of Transport and Main Road’s road network, as well as published Technical Note 167 A new approach to asphalt pavement design. TN167 introduced a methodology to develop mix-specific modulus and fatigue relationships that can be used for the design of asphalt pavements. This methodology was used in this project to characterise five locally manufactured EME2 asphalt mixes in the laboratory to develop ‘typical’ flexural modulus and fatigue relationships that will more accurately capture the performance of these mixes compared to using the presumptive relationships that were previously developed for more conventional asphalt mixes. A case study showed that the use of the ‘typical’ relationships developed as part of this project resulted in similar EME2 thicknesses compared to the current presumptive relationships adopted by TMR. It is recommended that the presumptive moduli and fatigue relationships currently being used by TMR be replaced by the ‘typical’ relationships developed in this project.

Media Info

  • Pagination: 34p

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Filing Info

  • Accession Number: 01769137
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Report/Paper Numbers: P10
  • Files: ITRD, ATRI
  • Created Date: Apr 6 2021 10:05AM