The Use of Bitumen Linear Viscoelastic Properties to Assess Rutting Sensitivity

Abstract:

The use of viscosity temperature relationships to predict creep performance of road bitumens have been shown to be inadequate in particular with respect to the analysis of polymer modified binders. In this paper we explore the origins of the US Strategic Highway Research Programmebinder performance grading system and detail two examples of more recent developments towards improved creep characterisation.Starting from first principles, an equation to analyse the ratio of dissipated to stored energy during sinusoidal loading of viscoelastic bitumen was derived. The energy equation was contrasted with an empirical relationship proposed by Anderson D.A., and with a second more theoretical derivation proposed by Shenoy A.Using frequency sweep data from a conventional 40/50 pen grade bitumen and a proprietary SBS modified binder, the applicability of the energy equation was subsequently compared to the two aforementioned post-SHRP creep relations. Recommendations are made regarding the suitability of the proposed relations in ranking bitumen creep performance.

• Periodical: Applied Mechanics and Materials (Volume 567)
• Pages: 755-762
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.567.755
• Online since: June 2014
• Authors: Salah E. Zoorob*, Ibrahim B. Kamaruddin, Napiah Madzlan
• Keywords: Bitumen, DSR Frequency Sweeps, Energy Equation, Rutting, SHRP Specifications, Viscoelasticity

References

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