Fatigue and Healing Characterization of Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 15, Issue 1
Abstract
This paper investigates the effect of the processes on fatigue fracture and fracture healing during controlled-strain, dynamic mechanical analysis (DMA) testing. Sand asphalt samples were fabricated with two SHRP-classified binders: AAD-1 and AAM-1. DMA testing was performed at 25°C and at 10 Hz. The mechanical response during DMA testing was monitored using three different damage indicators: (1) change in dynamic modulus; (2) change in pseudo stiffness; and (3) change in dissipated strain energy. When either of these parameters are plotted versus the number of load cycles, two inflection points are apparent that define a significant change in sample behavior due to damage. The second inflection point is a reasonable definition of failure, as it is strongly correlated with the peak of the plot of phase angle versus load repetitions. Furthermore, the phase angle drops precipitously at the second inflection point. By performing controlled-strain torsional fatigue tests at three different strain levels, each great enough to induce damage, a reproducible fatigue relationship (number of load cycles as a function of stress level) is developed. The introduction of several rest periods during testing lengthened fatigue life. Successful development of this testing method is suggested as a potential specification-type test method because of its efficiency, reproducibility, and reliability.
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Published In
Journal of Materials in Civil Engineering
Volume 15 • Issue 1 • February 2003
Pages: 75 - 83
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 23, 2001
Accepted: Dec 13, 2001
Published online: Jan 15, 2003
Published in print: Feb 2003
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