Book chapter
Towards more realistic accelerated laboratory aging of asphalt samples
Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements: Proceedings of the 5th International Symposium on Frontiers of Road and Airport Engineering, 12-14 July, 2021, Delft, Netherlands (IFRAE), pp.406-411
International Symposium on Frontiers of Road and Airport Engineering, 5th (Delft, Netherlands, 12-Jul-2021 - 14-Jul-2021)
CRC Press
2022
Abstract
When rutting and fatigue cracking distresses are avoided, surface fretting and ravelling due to age-related erosion of the bituminous mastic is the usual trigger for asphalt surface replacement in flexible pavement structures. This is particularly the case for lightly trafficked pavements, such as local roads, as well as for aircraft pavements, where the majority of the pavement surface is rarely trafficked. The age-related erosion of bituminous mastic is complicated and is affected by many factors, although the chemical aging of the bituminous binder is the most significant. Researchers and practitioners have many established tests for the mechanical properties of asphalt mixtures, including fatigue, fracture and deformation resistance, along with stiffness/modulus and moisture damage resistance. However, the protocols for accelerated laboratory aging are less clear. Most current accelerated laboratory aging protocols for asphalt mixtures are based on placing loose or compacted asphalt samples in a dry oven, typically at 70-90°C, for a pre-determined period, typically a few days or weeks. The combination of oven temperature and exposure time is intended to result in oxidative binder aging that is equivalent to a lifecycle of aging in a typical real-world pavement surface. The benchmarks used for setting equivalent aging are usually either the modulus of asphalt samples cored from a real pavement, or the viscosity of the binder extracted from a core of asphalt. These existing protocols do not reflect the temperature gradients or cycles that are known to exist in real pavement surfaces, nor do they expose the asphalt samples to ultraviolet radiation or moisture. Because of the importance of accelerated laboratory aging to the assessment of surface durability of asphalt mixtures containing recycled or waste materials, as well as the efficacy of surface preservation treatments, a more realistic accelerated laboratory aging protocol for asphalt samples is of great interest to researchers and practitioners alike. This paper explains the need for a more realistic accelerated asphalt aging protocol, the use of a commercially available weathering chamber for this purpose and the hypothetical results of asphalt aging trials. The conclusions address the preliminary protocol developed to date, the need for further research in this area and the benefits associated with such a protocol once it is finalized.
Details
- Title
- Towards more realistic accelerated laboratory aging of asphalt samples
- Authors
- Gregory White (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
- Xueyan Liu (Editor) - Delft University of TechnologyKumar Anupam (Editor) - Delft University of TechnologySandra Erkens (Editor) - Delft University of TechnologyLijun Sun (Editor) - Tongji UniversityJianming Ling (Editor) - Tongji University
- Publication details
- Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements: Proceedings of the 5th International Symposium on Frontiers of Road and Airport Engineering, 12-14 July, 2021, Delft, Netherlands (IFRAE), pp.406-411
- Conference details
- International Symposium on Frontiers of Road and Airport Engineering, 5th (Delft, Netherlands, 12-Jul-2021 - 14-Jul-2021)
- Publisher
- CRC Press
- DOI
- 10.1201/9781003251125-64; 10.1201/9781003251125
- ISBN
- 9781003251125
- Organisation Unit
- University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99575308802621
- Output Type
- Book chapter
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