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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 425827, 8 pages
http://dx.doi.org/10.1155/2015/425827
Research Article

Effect of Short-Term Aging Process on the Moisture Susceptibility of Asphalt Mixtures and Binders Containing Sasobit Warm Mix Additive

1Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
2Key Laboratory of Road Structure and Material of Ministry of Transport, Chang’an University, Xi’an, Shaanxi 710064, China
3Key Laboratory of Highway Network Monitoring of Gansu Province, Gansu Hengda Road and Bridge Engineering Group Co. Ltd., Lanzhou, Gansu 730070, China

Received 23 July 2015; Revised 20 October 2015; Accepted 16 November 2015

Academic Editor: Charles C. Sorrell

Copyright © 2015 Bo Li 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

Moisture susceptibility is one of the key issues of warm mix asphalt (WMA). In this research, the moisture susceptibility of asphalt mixtures and binders containing Sasobit warm mix additive was investigated in comparison to that of hot mixture asphalt (HMA) through laboratory aging experiments. The WMA asphalt mixtures were aged in the laboratory at three aging temperatures and times. The moisture susceptibility of the asphalt mixtures was measured through the laboratory immersed Marshall test and freeze-thaw splitting test. The surface free energy (SFE) of asphalt binders extracted from WMA asphalt mixtures was determined by the sessile drop method. The results show that the aging time and temperature have a significant effect on the improvement in moisture susceptibility in terms of both the freeze-thaw splitting strength ratios and the residual Marshall stability of asphalt mixtures containing Sasobit warm mix additive. The SFE of asphalt binders extracted from Sasobit warm mix increased with the aging time and temperature. The moisture susceptibility of the asphalt mixtures and binders containing Sasobit warm mixes was similar to or even greater than that of HMA aging under certain conditions.