Abstract
Sulphur modified asphalt mixtures using pelletised sulphur as the bitumen extender/modifier have shown enhanced mechanical performance in terms of stiffness, resistance to permanent deformation and potentially even fatigue. However, concerns still exist in terms of the long-term durability of the modified asphalt mixtures in relation to their moisture damage susceptibility. A moisture damage protocol has therefore been designed specifically for sulphur modified asphalt mixtures. The dynamic mechanical and fatigue properties of the moisture damaged sulphur modified asphalt mixtures were then investigated using stiffness tests applying indirect tension to cylindrical specimens, two-point bending DMA and fatigue tests. The moisture damage protocol involves placing the specimens in a water bath at 85°C for 9 days for both the sulphur modified asphalt mixtures and a control dense bitumen macadam (DBM) asphalt mixture. Initial results show significant stiffness loss for the moisture conditioned sulphur modified asphalt mixtures and a reduction in fatigue performance relative to the unconditioned asphalt mixtures. Nevertheless non-permanent effects of moisture conditioning have been observed which led to partial recovery of the material properties.
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Cocurullo, A., Grenfell, J., Yusoff, N.I.M., Airey, G. (2012). Effect of Moisture Conditioning on Fatigue Properties of Sulphur Modified Asphalt Mixtures. In: Scarpas, A., Kringos, N., Al-Qadi, I., A., L. (eds) 7th RILEM International Conference on Cracking in Pavements. RILEM Bookseries, vol 4. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4566-7_77
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DOI: https://doi.org/10.1007/978-94-007-4566-7_77
Publisher Name: Springer, Dordrecht
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Online ISBN: 978-94-007-4566-7
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