Chemical Aging Indexes and Rheological Parameters for Cracking Susceptibility Evaluation of Alaskan Polymer–Modified Asphalt Binders
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 3
Abstract
Asphalt oxidation induces asphalt binder embrittlement, which in turn increases the susceptibility of flexible pavement to fatigue and low-temperature cracking. It is critical to determine an index that can appropriately track the oxidation extent of asphalt binder and assess its cracking susceptibility. The objectives of this study are to investigate the connections between the chemical changes by oxidation with rheological parameters, and to identify suitable chemical aging indices and rheological parameters to assess the cracking susceptibility of Alaskan asphalt binders. A total of 13 typical Alaskan asphalt binders were collected from three different suppliers. The Glover-Rowe () parameter, rheological index (-value), , and fatigue parameter () were selected as rheological parameters to quantify the change of cracking susceptibility of asphalt binder with aging. Fourier transform infrared spectroscopy (FTIR) technologies were applied to obtain the chemical aging indices such as the ratio of peak height between and (), Carbonyl Index, and Sulfoxide Index. The results indicated that the was the most effective chemical aging index to track the oxidation extent of asphalt binder. The parameter was the most promising rheological index among the evaluated rheological parameters (i.e., parameter, -value, , and ) to evaluate the durability and cracking susceptibility of asphalt binder because it correlated well with the . The -value was not desirable in some cases due to the difficulty in calculation. The fatigue parameter () showed a weak correlation with the chemical aging indices. A fair correlation could be developed between and the , but the correlation was not as strong as that developed for the parameter.
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Data Availability Statement
All data used during the study appear in the published article.
Acknowledgments
This study was funded by the Alaska Department of Transportation and Public Facilities (Alaska DOT&PF) and Center for Environmentally Sustainable Transportation in Cold Climates (CESTiCC). The authors gratefully acknowledge the Alaska DOT&PF and CESTiCC for their financial support. The assistance of Dr. Yuhong Wang and his group from the Hong Kong Polytechnic University in FTIR test is greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 3 • March 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 19, 2019
Accepted: Aug 13, 2020
Published online: Jan 6, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 6, 2021
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