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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 247149, 11 pages
http://dx.doi.org/10.1155/2015/247149
Research Article

Evaluation of Permanent Deformation of Unmodified and Rubber-Reinforced SMA Asphalt Mixtures Using Dynamic Creep Test

1Department of Civil Engineering, Centre for Transportation Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2College of Engineering, Universiti Tenaga Nasional, 43000 Selangor, Malaysia

Received 9 December 2014; Accepted 27 January 2015

Academic Editor: Krystyn Van Vliet

Copyright © 2015 Herda Yati Katman 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

This paper presents the evaluation of permanent deformation of rubber-reinforced SMA asphalt mixtures by using dynamic creep test. The effect of trans-polyoctenamer as a cross-linking agent in permanent deformation of rubberized mixtures was also evaluated. Dynamic creep test was conducted at different stress levels (200 kPa, 400 kPa) and temperatures (40°C, 50°C). Permanent deformation parameters such as dynamic creep curve, ultimate strain, and creep strain slope (CSS) were used to analyse the results. Finally, the creep behaviour of the specimens was estimated by the Zhou three-stage creep model. The results show that crumb rubber and trans-polyoctenamer significantly affected the parameters especially at high stress and temperatures. Consistent findings were observed for all permanent deformation parameters. Moreover, based on Zhou model, it was concluded that resistance to permanent deformation was improved by application of crumb rubber and trans-polyoctenamer.