Temperature Susceptibility of Multigrade Bitumen Asphalt and an Approach to Account for Temperature Variation through Deep Pavements
Multigrade bitumen asphalt is a quality asphalt product that is not utilised in many places globally. Multigrade bitumen is believed to be less sensitive to temperature, which gives it an advantage over conventional binders. Previous testing has shown that asphalt temperature changes greatly with depth, but currently the industry standard is to nominate a single temperature for design. For detailed design of asphalt roads, perhaps asphalt layers should be divided into nominal layer depths and different modulus and fatigue equations/values should be used to reflect the temperatures of each respective layer. A collaboration of previous laboratory testing conducted on multigrade bitumen asphalt beams under a range of temperatures and loading conditions was analysed. The samples tested included 0% or 15% recycled asphalt pavement (RAP) to determine what impact the recycled material has on the fatigue life and stiffness of the pavement. This paper investigated the temperature susceptibility of multigrade bitumen asphalt pavements compared to conventional binders by combining previous testing that included conducting a sweep of fatigue tests, developing complex modulus master curves for each mix and a study on how pavement temperature changes through pavement depth. This investigation found that the final design of the pavement is greatly affected by the nominated pavement temperature and respective material properties. This paper has outlined a potential revision to the current design approach for asphalt pavements and proposes that further investigation is needed into pavement temperature and its incorporation into design.
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 Clark, B., Gallage, C. & Piacere, L. (2018). “Effects of Recycled Asphalt Pavement on the Stiffness and Fatigue Performance of Multigrade Bitumen Asphalt”. J. Mater. Civ. Eng. DOI: 10.1061/(ASCE)MT.1943-5533.0002150.
 Sachs, S. G., Vandenbossche, J. M., Li, Z. & Barman, M. (2016). “Accounting for Temperature Susceptibility of Asphalt Stiffness When Designing Bonded Concrete Overlays of Asphalt Pavements”. J. Trans. Eng. DOI:10.1061/(ASCE)TE.1943-5436.0000861.
 Laws, N., Westaway, K., Yeaman, J. & White, G. (2017). “Characterisation of Brisbane Asphalt Mixtures for Dynamic Modulus”. 17th AAPA International Flexible Pavements Conference. Melbourne, Australia.
 Austroads. (2013). “Improved Design Procedures for Asphalt Pavements: Pavement Temperature and Load Frequency Estimation.” AP-T248-13. Austroads. Sydney, NSW.
 Austroads. (2017). “Guide to Pavement Technology Part 2: Pavement Structural Design.” Austroads. Sydney, NSW.
 Read, J. and Whiteoak, D. (2003). “The Shell Bitumen Handbook”. Shell Bitumen.
 Feng, D. & Gong, C. (2012). “Sensitivity Analysis and Determination of the Effects of Asphalt Pavement Thermophysical Properties on the Temperature Field”. Journal of Highway and Transportation Research and Development. DOI: 10.1061/JHTRCQ.0000001.
 Zhao, X., Shen, A. & Ma, B. (2018). “Temperature response of asphalt pavement to low temperatures and large temperature differences.” Int. J. of Pav. Eng. DOI: 10.1080/10298436.2018.1435883.
 Herb, W., Velasquez, R., Stefan, H., Marasteanu, M. O. & Clyne, T. (2011). “Simulation and Characterization of Asphalt Pavement Temperatures.” Road Materials and Pavement Design. DOI: 10.1080/14680629.2009.9690190.
 Vardanega, P. J., Waters, T. J., Spies, R. E., Ramanujam, J. M. and Nataatmadja, A. (2010) “Ranking Binder Creep Performance Using the ARRB Elastometer.” J. Mater. Civ. Eng. DOI: 10.1061/(ASCE)MT.1943-5533.0000043.
 Clark, B. & Gallage, C. (2018). “Effects of temperature on fatigue performance of Multigrade bitumen asphalt mixed with recycled asphalt”. J. Mater. Civ. Eng. (Submitted) Manuscript Number: MTENG-7111.
 Petho, L. and Stephenson, G. (2014). “Stiffness Variability of Multigrade Asphalt in Brisbane.” 26th ARRB Conference – Research driving efficiency, Sydney, New South Wales.
 Gray, C. (2015). “Thermal Characterisation of Asphalt Mixtures in the Laboratory”. A thesis submitted for partial completion of the requirements for the award of a Bachelor of Engineering in Civil Engineering, School of Science and Engineering, University of the Sunshine Coast, Sippy Downs, Queensland, Australia, November.
 Austroads. (2016). “Austroads Test Method AGPT/T274 – Characterisation of Flexural Stiffness and Fatigue Performance of Bituminous Mixes.” Austroads. Sydney, NSW.