Influence of Warm-Mix Additives on Physical, Rheological, and Morphological Properties of High-Viscosity Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 2
Abstract
The effect of warm-mix additive (WMA) on styrene-butadiene-styrene (SBS)-based high-viscosity asphalt (HVA) was conducted in this study. First, the physical properties for control HVA and HVA with WMA (RH, EC-120, and Sasobit with 2%, 3%, and 4%, respectively) were evaluated to select the optimum WMA. Physical tests showed that all WMAs reduced viscosity (135°C) significantly, while absolute viscosity (60°C) was improved by EC-120 and Sasobit. In addition, EC-120 improved toughness and tenacity. The rheology and morphology of HVA with and without optimum WMA (3% EC-120) were tested using dynamic shear rheometer (DSR), bending beam rheometer (BBR), and scanning electron microscope (SEM). The results indicated that the high-temperature rheological performance was improved by adding EC-120 under unaged and short- and long-term aging conditions. In addition, EC-120 improved the low-temperature creep behavior of the asphalt binder after long-term aging. This finding was further demonstrated by morphological observation, in which a multinetwork was formed after long-term aging.
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Acknowledgments
The authors are grateful to the anonymous reviewers for their thorough and most helpful comments. This project was financially supported by the Science and Technology Project of Education Department of Fujian Province, China (JAT160165), and the University Development Foundation of Fujian Agriculture and Forestry University (113-612014018), and Natural Science Foundation, China (51608123). The authors would like to acknowledge Changbin Hu for his support of some experiments.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Sep 25, 2017
Accepted: May 15, 2018
Published online: Nov 20, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 20, 2019
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