Book chapter
Improved accelerated ageing of asphalt samples in the laboratory
Roads and Airports Pavement Surface Characteristics, pp.3-13
Symposium on Pavement Surface Characteristics, 9th (Milan, Italy, 12-Sep-2022 - 14-Sep-2022)
CRC Press
2023
Abstract
There are currently two established approaches to the accelerated ageing of asphalt mixture and bituminous binder samples in the laboratory. The first is to expose a film of the bituminous binder to heat and air, under controlled conditions. Different protocols are intended to represent the ageing associated with asphalt mixture production, as well as the long-term field ageing of an asphalt surface. The second approach is to expose the asphalt mixture to elevated temperature in an oven, intended to represent long-term field ageing. The current protocols for ageing bituminous binder samples do not take into account the interactions between the binder and the aggregate. The binder ageing protocols do not include UV irradiation and do not use representative binder film thicknesses. Furthermore, the current protocols for ageing asphalt mixture samples do not include UV irradiation, and the heat is applied equally to all sides of the sample, which is not representative of field conditions. The limitations associated with the current protocols for the accelerated ageing of asphalt binder and mixture samples in the laboratory is a significant issue. Any research into the effect of incorporating recycled waste materials in asphalt mixtures relies on a robust accelerated ageing protocol. Similarly, research on asphalt rejuvenation and preservation treatments also requires reliable accelerated ageing protocols, to avoid the need for 10 or more years of field ageing to measure the benefits. Therefore, more reliable accelerated asphalt ageing protocols are critical to better pavement surfacing technology. This paper explains the limitations of the current asphalt binder and mixture laboratory ageing protocols and summarises efforts to develop a more reliable approach. The proposed approach incorporates UV and heat exposure, which is more representative of field conditions. Examples demonstrate that the proposed approach results in more realistically aged asphalt surfaces and the preferred indicators of sample age are described.
Details
- Title
- Improved accelerated ageing of asphalt samples in the laboratory
- Authors
- Greg White (Corresponding Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and EngineeringAhmed Abouelsaad (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
- Contributors
- Maurizio Crispino (Editor) - Department of Civil and Environmental Engineering, ItalyToraldo Emanuele (Editor) - Department of Civil and Environmental Engineering, Italy
- Publication details
- Roads and Airports Pavement Surface Characteristics, pp.3-13
- Conference details
- Symposium on Pavement Surface Characteristics, 9th (Milan, Italy, 12-Sep-2022 - 14-Sep-2022)
- Publisher
- CRC Press
- DOI
- 10.1201/9781003429258-1; 10.1201/9781003429258
- ISBN
- 9781003429258
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99726820702621
- Output Type
- Book chapter
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