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Understanding Mechanisms Leading to Asphalt Binder Fatigue
- Publisher
- Springer Journals
- Copyright
- Copyright © Springer Nature B.V. 2020
- ISSN
- 1385-2000
- eISSN
- 1573-2738
- DOI
- 10.1007/s11043-020-09462-0
- Publisher site
- See Article on Publisher Site
Abstract
This study is an attempt to quantify the nonlinear rheological behavior of four different asphalt binders using linear amplitude sweep (LAS) test and large amplitude oscillatory shear (LAOS) test at intermediate temperatures (10 °C, 20 °C, and 30 °C) in unaged (UA) and short-term aged (STA) conditions. Additionally, the present study also relates the response of the asphalt binders under increasing strain amplitude, obtained from both test methods. LAS test results indicated improvement in the fatigue life of asphalt binders with an increase in temperature. The effect of ageing on fatigue life was found to be binder dependent. Lissajous–Bowditch (LB) plots and higher-order harmonic ratio I3/I1\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$I_{3} /I_{1}$\end{document} were found to be imperative analysis procedures to study the LAOS test results. The effect of instrument inertia at low strain and higher frequency, along with the deterioration of the binder at high strain amplitudes, led to distorted stress-strain LB curves, which resulted in ambiguous values of strain stiffening ratio S\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$S$\end{document}. It was found that I3/I1\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$I_{3} /I_{1}$\end{document} can be appreciably correlated with the fatigue life Nf\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$N_{f}$\end{document} obtained from LAS test using the relationship Nf=0.2×(I3I1)−1.42\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$N_{f} =0.2 \times ( \frac{I_{3}}{I_{1}} )^{-1.42}$\end{document}. The relationship validated in the study is found to be independent of temperature, type of binder, and ageing condition.
Journal
Mechanics of Time-Dependent Materials – Springer Journals
Published: Sep 28, 2020
Keywords: LAS; LAOS; Fatigue; Ageing; DSR