Rheological Characterization of Recycled Asphalt Binders and Correlating the Zero Shear Viscosity to the Superpave Rutting Parameter
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 9
Abstract
The rheological behavior of recycled asphalt binders is important in the design of the optimum content of reclaimed asphalt pavement (RAP) material to be used in highway recycling projects. In this study, oscillatory tests were performed on recycled binders of varying RAP concentrations. The complex modulus master curves were constructed using the time–temperature superposition principle. The zero shear viscosities (ZSVs) were estimated using the Carreau–Yasuda model on the complex viscosity master curves for all the recycled binder combinations. It was found that the activation energy of flow changed linearly from 115.1 to with an increase in the RAP content, whereas ZSV varied exponentially with an increase in the RAP content. A good correlation was found between the ZSV and the Superpave rutting parameter (). An equation was derived to predict the at any RAP concentration and temperature. For practical use, a contour plot approach is introduced to calculate directly the maximum and minimum RAP content for any target binder grade suitable for the construction site. cA noticeable change in rheological behavior of recycled binders was observed on either side of the 40% RAP incorporation level.
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Data Availability Statement
The experiment data were measured in the laboratory of the Indian Institute of Technology Roorkee. All the data are genuine and authentic to the best of the authors’ knowledge. There is no potential conflict of interest. Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are grateful to the Rheology App available on the Android platform, which helps improve the understanding and analysis of the rheological data. This study was supported by the Prime Minister’s Fellowship for Doctoral Research, sponsored by Shell India Markets Pvt. Ltd. and the Government Body Federation of Indian Chambers of Commerce & Industry (FICCI)–Science and Engineering Research Board (SERB), India. The authors thank Mayank Varshney of Anton Paar India for help with the data verification.
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© 2022 American Society of Civil Engineers.
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Received: Aug 19, 2021
Accepted: Jan 5, 2022
Published online: Jun 24, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 24, 2022
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