New Methodology to Find the Healing and Fracture Properties of Asphalt Mixes Using Overlay Tester
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 10
Abstract
Asphalt layers under different repeated loading and rest periods experience both fatigue and healing processes. The tests are costly and time consuming and the results are highly variable. Current methods of evaluating these phenomena using the overlay tester (OT) rely on counting the number of load repetitions until the crack breaks through the sample. This research provides a novel analysis method based on viscoelastic fracture mechanics and finite-element modeling to predict the actual crack growth rate in asphalt mixes, both in laboratory compacted and field samples, by using the OT. Furthermore, the new method uses the principles of viscoelastic fracture mechanics to find the fracture and healing properties of the asphalt mixes. The resulting test is fast, less costly, and more repeatable than previous methods using the OT. The precision of the test method was determined and improved by testing lab compacted specimens. The coefficients of variation of the undamaged properties of the laboratory compacted mixture are comparable with the test results.
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Acknowledgments
The authors gratefully acknowledge receiving the support from the Texas Department of Transportation in Texas Transportation Institute project number 6607. Any opinions expressed here are those of the authors and do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 10 • October 2013
Pages: 1386 - 1393
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 2, 2011
Accepted: Aug 27, 2012
Published online: Aug 31, 2012
Discussion open until: Jan 31, 2013
Published in print: Oct 1, 2013
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