Characterization of High RAP/RAS Asphalt Mixtures Using Resonant Column Tests
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 11
Abstract
Using recycled materials in construction of asphalt pavements yields both economic and technical advantages. Recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) are two major sources to serve this purpose for which proper design and characterization are key elements. In this study, engineering properties of asphalt concrete containing RAP and RAS under dynamic loading were investigated. Three asphalt mixes were designed and included in this research: a conventional mix with no RAP/RAS as a control, a mix with 35% RAP, and finally a mix with 35% RAP and 5% RAS. A conventional resonant column (RC) apparatus was retrofitted and used for testing the specimens in torsional mode. Testing was conducted at five temperatures ranging from 10 to 45°C. Damping ratios and moduli of the mixes were analyzed and compared to assess the effect of the recycled materials on dynamic properties of asphalt concrete. Results clearly show the impact of RAP and RAS in increasing the mix stiffness. The study also included uniaxial dynamic modulus (DM) testing of the control mix to compare the moduli measured at high frequencies through RC testing to those estimated by the DM master curve through extrapolation. Results show that the modulus obtained from RC testing correlates well with that extrapolated from DM tests. Results also indicate that the accuracy of such correlation is significantly increased once dependency of Poisson’s ratio on modulus is incorporated.
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Acknowledgments
Financial support for this study was provided by Mid-Atlantic University Transportation Center (MAUTC), Penn State Department of Civil and Environmental Engineering, and Northeast Center of Excellence for Pavement Technology (NECEPT). This support is gratefully acknowledged. The help and support by Mr. Scott Milander of NECEPT is also greatly appreciated.
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© 2016 American Society of Civil Engineers.
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Received: Nov 20, 2015
Accepted: Apr 18, 2016
Published online: Jun 22, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 22, 2016
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