Evaluation of fatigue properties of bituminous binders

Title: Evaluation of fatigue properties of bituminous binders
Author(s): J.-P. Planche, D. A. Anderson, G. Gauthier,, Y. M. Le Hir, D. Martin
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 110 - 116
Total Pages: 7
Nb references: 8
Language: English

Abstract: The original asphalt binder Superpave specification criterion for fatigue, G*sind, has received considerable criticism as a specification requirement. A time sweep using the dynamic shear rheometer (DSR) has been proposed as an alternative test method for the Superpave specification. The "modulus versus number of cycles" relationships generated in the time sweep test have the appearance of typical fatigue curves. In this paper, the data was examined with respect to its validity as a measure of fatigue.
Special attention was given to parameters that affect or could be confounded with "true" fatigue response: apparent fatigue can generate phenomena susceptible to interfere with the fatigue behavior:
- Initial value of the complex modulus of the material. Behavior in repeated shear depends markedly on the initial stiffness of the binder. If the initial stiffness is low, damage can occur as a result of plastic flow at the outer edge of the asphalt binder.
- The influence of the rest periods at different time of the test.
- The drop of the modulus at the beginning of the curves.
- Steric hardening occurring with time, apparently even during loading, may have some effect on fatigue like when the time sweep is applied over an extended period of time.
- Binder type: this procedure showed significant differences in the behavior of various modified binders.

Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.011

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