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Advances in Civil Engineering
Volume 2017, Article ID 7240462, 7 pages
https://doi.org/10.1155/2017/7240462
Research Article

The Effect of Aging on the Cracking Resistance of Recycled Asphalt

1Department of Civil and Environmental Engineering, Florida International University, Miami, FL, USA
2Oldcastle Materials Group, Lutz, FL, USA
3State Material Office, Florida Department of Transportation, Gainesville, FL, USA

Correspondence should be addressed to Mojtaba Mohammadafzali; ude.uif@020ahomm

Received 30 January 2017; Accepted 7 June 2017; Published 21 August 2017

Academic Editor: Luigi Di Sarno

Copyright © 2017 Mojtaba Mohammadafzali et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fatigue cracking is an important concern when a high percentage of Reclaimed Asphalt Pavement (RAP) is used in an asphalt mixture. The aging of the asphalt binder reduces its ductility and makes the pavement more susceptible to cracking. Rejuvenators are often added to high-RAP mixtures to enhance their performance. The aging of a rejuvenated binder is different from virgin asphalt. Therefore, the effect of aging on a recycled asphalt mixture can be different from its effect on a new one. This study evaluated the cracking resistance of 100% recycled asphalt binders and mixtures and investigated the effect of aging on this performance parameter. The cracking resistance of the binder samples was tested by a Bending Beam Rheometer. An accelerated pavement weathering system was used to age the asphalt mixtures and their cracking resistance was evaluated by the Texas Overlay Test. The results from binder and mixture tests mutually indicated that rejuvenated asphalt has a significantly better cracking resistance than virgin asphalt. Rejuvenated mixtures generally aged more rapidly, and the rate of aging was different for different rejuvenators.