Performance Evaluation of Asphalt Rubber in Porous Asphalt-Concrete Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 3
Abstract
The purpose of this study was first to present the laboratory mix design results for porous asphalt concrete (PAC) mixtures blended with high-viscosity-graded cement (AR-80) and asphalt rubber (AR). In addition, the master curves of dynamic modulus were determined for both the unconfined and confined conditions to evaluate the rutting behavior of both PAC mixtures. The mix design results showed that the PAC open-graded mixture consisted of a relatively large percentage of coarse aggregate, with less than 15% of the material passing through a 2.36-mm (No. 8) sieve, which created a sufficient space for water drainage. The target air voids of approximately 20%, as well as the coefficient of permeability greater than , were established. Comparing the master curves of dynamic modulus between these two types of PAC mixtures indicated that the asphalt-rubber mixtures exhibited higher dynamic modulus at longer reduced times for both the unconfined and confined conditions. The experimental results of repeated triaxial-loaded and wheel tracking permanent deformation tests confirmed that the asphalt-rubber mixtures have superior performance against rutting. Furthermore, the high void of both PAC mixtures illustrated the validity of the principles of time-temperature superposition in the large strain of the viscoplastic stage during repeated triaxial-loaded permanent deformation tests.
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Acknowledgments
This research was supported in part by the Ministry of Education, Taiwan, under the ATU Plan. The AR-80 testing cement was supplied by the Chinese Petroleum Corp., Taiwan. The writers are grateful for their assistance.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 3 • March 2011
Pages: 342 - 349
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 8, 2008
Accepted: Sep 23, 2010
Published online: Sep 27, 2010
Published in print: Mar 1, 2011
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