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M. Bueno, A. Garcia, M.N. Partl
Applications of Strain-Rate Frequency Superposition for Bituminous Binders
Appl. Rheol. 25:6 (2015) 65980 (12 pages)
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Nonlinear viscoelastic behavior of bitumen has a determinant effect on the performance of asphalt roads suffering permanent
deformation due to traffic loads. Up to know, conventional rheological characterization of bituminous binders, such as
the time-temperature superposition (TTS) method, only addresses the linear response of this material without considering
the application of high strain amplitudes. The strain-rate frequency superposition (SRFS) is an analogous technique that can
experimentally determine the flow behavior from nonlinear oscillatory shear experiments. This method was originally
applied to soft materials in order to study the slow relaxation process of particular systems by shifting to higher frequencies
the behavior usually found at very low frequencies during conventional measurements. In this work, the feasibility of the
SRFS method for assessing the rheological properties of bituminous binders has been evaluated. Oscillatory shear measurements
accomplished at different constant shear strain ampliture rates (γ. = ωγ0)
and test temperatures allowed analysing
the influence of the nonlinear behavior of unmodified and polymer modified bitumen on their viscoelastic responses. The
results showed that displacements in the responses due to different strain rates were not so significant as to extend the frequency
range further than in conventional measurements. Differences in responses between both techniques were mainly
observed for polymer modified binders, especially to high strain amplitudes which usually involve nonlinear behaviour. In
addition, master curves obtained with constant strain rates, i.e. taking into account nonlinear response of the material,
showed similar results to those constructed by using conventional methods with constant strain amplitude. From these
results, a closer comprehension of the large deformations generated in asphalt pavements can be achieved by studying the
nonlinear viscoelastic properties of the bituminous binder.
► Cite this publication as follows:
Bueno M, Garcia A, Partl M: Applications of Strain-Rate Frequency Superposition for Bituminous Binders, Appl. Rheol. 25 (2015) 65980.
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