Rheological and Spectroscopic Properties of Ethylene Vinyl Acetate–Modified Rubberized Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
The effect of ethylene vinyl acetate (EVA) on the aging properties and rheological properties of rubberized asphalt was measured in this paper to identify the optimum proportion of EVA combined with waste tire rubber (WTR) modified asphalt. Aging methods of thin-film oven test (TFOT) and pressure aging vessel test (PAV) were conducted to imitate the different degrees of the aging process. At first, frequency sweep at different temperatures was carried out to construct the construction of master curves, following the time-temperature superposition principle, to evaluate the aging sensitivity. The black diagram was depicted to compare the rheological behavior of different asphalt binders. The calculation of the WLF equation based on the shift factor of master curves was conducted to calculate the values and aging index of 15°C DSRFn to assess the resistance to fatigue cracking at the intermediate temperature. Then, zero shear viscosity (ZSV) and rutting factor () at 60°C were also used to calculate the aging index, because these both are measurements of resistance to rutting deformation at high temperature. Finally, the microstructure of unaged and aged asphalt binder was studied by Fourier transform infrared spectroscopy (FTIR). The relationship between rheological and chemical indexes was studied. The results show that 15%WTR+4%EVA has the best antiaging performance, and EVA can reduce the aging sensitivity of different parameters, especially in the high-temperature area.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was supported by the National Natural Science Foundation of China (Nos. 50808077 and 51278188) and the National Key R&D Program of China (2018YFB0505400). The authors sincerely show gratitude for their financial support. In addition, the third author acknowledges the financial support from the China Scholarship Council (CSC No. 201606130003). The views and findings of this study represent those of the authors and may not reflect those of the funding agencies.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 26, 2019
Accepted: Nov 6, 2019
Published online: Mar 28, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 28, 2020
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