Material nonlinearity in asphalt binder fatigue testing and analysis

Material nonlinearity in asphalt binder fatigue testing and analysis Fatigue cracking is a primary distress in asphalt pavements caused by the accumulation of damage under repeated traffic loading. Asphalt binder is the weakest constituent of asphalt mixture. Therefore, the inherent fatigue resistance of the asphalt binder contained within the pavement is anticipated to influence pavement performance. The simplified viscoelastic continuum damage (S-VECD) model has been applied to predict fatigue life of asphalt binders under varying loading and thermal conditions using time sweep and linear amplitude sweep (LAS) test results. The majority of past efforts using S-VECD analysis protocol have neglected the effects of material nonlinearity and attributed all material integrity loss to damage for the sake of simplicity. Herein, experimental and analytical methods are evaluated for delineating damage and nonlinearity in fatigue testing of asphalt binder. None of the experimental methods evaluated enabled accurate separation of damage and nonlinearity at the high strain amplitudes included in LAS tests. Therefore, an analytical method using S-VECD modeling was proposed to back calculate nonlinear dynamic shear moduli from LAS test results. Results can be used to generate a nonlinear S-VECD model which allows for improved fatigue life predictions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

Material nonlinearity in asphalt binder fatigue testing and analysis

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2017.08.010
Publisher site
See Article on Publisher Site

Abstract

Fatigue cracking is a primary distress in asphalt pavements caused by the accumulation of damage under repeated traffic loading. Asphalt binder is the weakest constituent of asphalt mixture. Therefore, the inherent fatigue resistance of the asphalt binder contained within the pavement is anticipated to influence pavement performance. The simplified viscoelastic continuum damage (S-VECD) model has been applied to predict fatigue life of asphalt binders under varying loading and thermal conditions using time sweep and linear amplitude sweep (LAS) test results. The majority of past efforts using S-VECD analysis protocol have neglected the effects of material nonlinearity and attributed all material integrity loss to damage for the sake of simplicity. Herein, experimental and analytical methods are evaluated for delineating damage and nonlinearity in fatigue testing of asphalt binder. None of the experimental methods evaluated enabled accurate separation of damage and nonlinearity at the high strain amplitudes included in LAS tests. Therefore, an analytical method using S-VECD modeling was proposed to back calculate nonlinear dynamic shear moduli from LAS test results. Results can be used to generate a nonlinear S-VECD model which allows for improved fatigue life predictions.

Journal

Materials & designElsevier

Published: Nov 5, 2017

References

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