Effect of SARA on Rheological Properties of Asphalt Binders
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 6
Abstract
As the basic chemical components of asphalt binders, the fractions of saturates, aromatics, resins, and asphaltenes (SARA) have crucial effects on the rheological properties of such binders. Thus, two kinds of neat asphalt binders and derived binders with different SARA proportions were studied in this paper. The dynamic rheological properties of two kinds of neat asphalt and the derived binders were tested by frequency sweep tests. Their static rheological properties were tested by creep and stress relaxation tests. The effect of SARA on dynamic modulus, phase angle, creep compliance, and relaxation modulus were analyzed. The results showed that the dynamic modulus increases with increases in asphaltenes or resins content and decreases with increases in saturates or aromatics content. Saturates have the greatest effect on dynamic rheology properties. Shape index shows a decreasing trend with increases in asphaltenes or resins content and an increasing trend with increases in saturates or aromatics content. Creep compliance and residual relaxation modulus decrease with increases in asphaltenes or resins content and increase with increases in saturates or aromatics content. SARA fractions have important effects on the rheological properties of asphalt binders.
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Acknowledgments
This study was funded by the National Natural Science Foundation of China (51778195, U1633201, and 51478153).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 6 • June 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 16, 2018
Accepted: Dec 4, 2018
Published online: Mar 30, 2019
Published in print: Jun 1, 2019
Discussion open until: Aug 30, 2019
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