Examining the Relationship between Bitumen Polar Fractions, Rheological Performance Benchmarks, and Tensile Strength
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
The chemical composition of a bitumen dictates its rheological properties as well as its performance in an asphalt mixture. Any bitumen comprises a wide variety of complex hydrocarbons, and its chemical composition can be characterized by many different parameters. Similarly, the mechanical properties of any given bitumen are typically characterized based on its time-temperature dependent rheological properties at different stress levels. This study characterizes the chemical makeup of a set of bitumens from several different producers based on their polarity and compares these characteristics to mechanical properties associated with the Superpave performance grading (PG) of bitumen and its tensile strength. To do this, a novel fractionation technique was used to separate the bitumens into chemical fractions, while performance testing was performed on the original bitumens. The results were compared using a statistical analysis software to examine relationships between the chemical fractions and physical properties. The results show that high temperature stiffness is strongly dictated by the asphaltene content and that the low temperature stiffness is strongly dictated by the aromatic and resin content. The useful temperature interval showed a good correlation with asphaltenes and resins. Finally, the tensile strength of the bitumens also showed a strong correlation with SARA parameters. Bitumens that deviated from some of these correlations also showed an uncharacteristic response in some other mechanical or elemental property measurements. The relationship between time-dependent characteristics and polar fractions was not strong and requires further understanding.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request (results of material tests and models created for correlations).
Acknowledgments
We acknowledge the support of National Science Foundation Grant No. CMMI-1053925 and the Texas Department of Transportation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 13, 2019
Accepted: Nov 18, 2019
Published online: Mar 30, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 30, 2020
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