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The Scientific World Journal
Volume 2013 (2013), Article ID 921090, 10 pages
http://dx.doi.org/10.1155/2013/921090
Research Article

The Effects of Salt on Rheological Properties of Asphalt after Long-Term Aging

College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Received 1 August 2013; Accepted 10 September 2013

Academic Editors: Y. H. Chiang, N. Ryan, and E. W. L. Cheng

Copyright © 2013 Xin Yu 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

Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations of salt (0.3%~5%) for different durations (1 day~30 days). Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged asphalt after being soaked for complex modulus and phase angle master curves and ultimate fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and fatigue resistance properties and improved high temperature properties of aged asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies.