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    An investigation into Dynamic Modulus of Western Australia Hot Mix Asphalt

    Access Status
    Fulltext not available
    Authors
    Kumlai, S.
    Jitsangiam, Peerapong
    Nikraz, Hamid
    Date
    2014
    Type
    Conference Paper
    
    Metadata
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    Citation
    Kumlai, S. and Jitsangiam, P. and Nikraz, H. 2014. An investigation into Dynamic Modulus of Western Australia Hot Mix Asphalt, in Y.R. Kim (ed), Proceedings of the International Conference on Asphalt Pavements, 1–5 June 2014, pp. 1311-1319. London: Taylor & Francis.
    Source Title
    Asphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP2014,
    Source Conference
    PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ASPHALT PAVEMENTSRALEIGH, NORTH CAROLINA, USA, 1–5 JUNE 2014
    ISBN
    978-1-315-73675-4
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/45598
    Collection
    • Curtin Research Publications
    Abstract

    Most road networks in Western Australia (WA) are made of flexible pavement with a relatively thin asphalt wearing course and Dense Graded Asphalt (DGA), a commonly used asphalt mix with a continuous size distribution and a low design air-void of around 3% to 7%. Currently, the input parameters for asphalt material for pavement design in Australia still rely entirely on the resilient modulus which cannot incorporate the visco-elastic behaviour of such material into pavement analysis and design. Unlike the resilient modulus, the recently introduced parameter of the dynamic modulus can express the intrinsic behaviour of the visco-elasticity of an asphalt material. The dynamic modulus can describe the stress-strain relationship of viscoelastic material across a wide range of temperatures and frequencies in the form of the Master Curve. The Master Curve is constructed from a sigmoidal function and the Time-Temperature Superposition principle (TTS) with a second-order polynomial shift factor function, according to AASHTO PP62-09. This study aims to investigate the dynamic modulus of Western Australian asphalt mixes, considering three different mixes with varying maximum aggregate sizes of 7 mm, 10 mm, and 14 mm. For this study, all test specimens were controlled to reach a 5% air-void with a Survopac gyratory compactor. Specimens were then tested with an Asphalt Mixture Performance Tester (AMPT) with a testing range of four temperatures: 4°C, 21°C, 37°C and 54°C, and six frequencies; 0.1 Hz, 0.5 Hz, 1 Hz, 5 Hz, 10 Hz, and 25 Hz, according to AASHTO TP62-07. Moreover, the dynamic modulus predictive equation proposed by NCHRP 1-37A MEPDG was modified and introduced to suit WA asphalt mixes.

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