Nonlinearity of asphalt binders and the relationship with asphalt mixture permanent deformation. Rodrigo Delgadillo

ISBN: 9780549636700

Published:

NOOKstudy eTextbook

156 pages


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Nonlinearity of asphalt binders and the relationship with asphalt mixture permanent deformation.  by  Rodrigo Delgadillo

Nonlinearity of asphalt binders and the relationship with asphalt mixture permanent deformation. by Rodrigo Delgadillo
| NOOKstudy eTextbook | PDF, EPUB, FB2, DjVu, audiobook, mp3, ZIP | 156 pages | ISBN: 9780549636700 | 6.55 Mb

Asphalt mixtures are widely used in pavements, they are composed of asphalt binder, mineral aggregates and air voids. Asphalt mixtures show permanent deformation when subjected to repeated loading, like the traffic loading on pavements. TheMoreAsphalt mixtures are widely used in pavements, they are composed of asphalt binder, mineral aggregates and air voids. Asphalt mixtures show permanent deformation when subjected to repeated loading, like the traffic loading on pavements. The contribution of the asphalt binder to resisting asphalt mixture permanent deformation is the main focus of this study.

Asphalt binders and asphalt mixtures are viscoelastic materials, and are nonlinear in their stress-strain response. In the current specifications of the American Association of State Highway and Transportation Officials (AASHTO), asphalt binders are tested at short times and with small stresses in the linear viscoelastic range, which does not allow to truly characterize the binder contribution to asphalt mixture permanent deformation.

Nonlinear characterization of asphalt binders is needed in order to accurately predict the binder contribution to resisting asphalt mixture permanent deformation.-This study tested the following hypotheses: a test method can be developed to capture the nonlinear properties of asphalt binders for a wide range of stresses and loading times- a nonlinear constitutive relationship can be developed to model the binder nonlinear response- and the nonlinear binder response can be directly correlated with the permanent deformation of asphalt mixtures.-Creep and recovery testing was performed on asphalt binders and on asphalt mixtures.

The binder testing included a polymer modified binder and an unmodified binder. They were tested using a Dynamic Shear Rheometer with cone and plate geometry. Five different stresses and four different loading times were used. The creep response was successfully modeled using a nonlinear power law with two terms. A nonlinear constitutive relationship was obtained by separating the nonlinear viscous part from the linear viscoelastic recoverable part.-Repeated creep and recovery testing of mixture was performed.

The mixtures were prepared using the same two binders and two different aggregates. Three stress levels were considered, to simulate tire pressures of traffic moving on in the highways and airfields. The nonlinearity of the mixture permanent deformation was found to correlate directly to the nonlinear response of the corresponding binder. The mixture permanent deformation was successfully modeled using a nonlinear power law function with two terms.



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