Physical, Rheological, and Aging Properties of Bitumen Containing Organic Expanded Vermiculite and Nano-Zinc Oxide
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 5
Abstract
This work investigates a novel bitumen modification by use of organic expanded vermiculite (OEVMT) and a nano-zinc oxide (nano-ZnO) compound. The content of OEVMT is 1% by mass of bitumen, while that of nano-ZnO is 1, 2, 3, and 4% by mass of bitumen. The binders were aged according to the thin-film oven test (TFOT), pressure aging vessel (PAV) test, and ultraviolet (UV) radiation, respectively. The effect of the OEVMT and nano-ZnO compound on the physical and rheological properties of bitumen before and after aging was investigated. The results show that the high-temperature stability of bitumen can be enhanced, while the other physical properties of bitumen are slightly influenced with the introduction of OEVMT and the nano-ZnO compound. As a result of TFOT, PAV, and UV aging, OEVMT and nano-ZnO modified bitumens show lower viscosity aging index, softening-point increment, phase angle aging index, and complex modulus aging index, and higher retained penetration in comparison with base bitumen, indicating their good thermal-oxidation and UV-aging resistance. However, this improvement depends on the OEVMT and nano-ZnO content. The recommended content is 1% OEVMT plus 3% nano-ZnO by combining the physical and rheological properties results before and after three aging methods. Such a result suggests that the OEVMT and nano-ZnO compound can be effectively used as modifiers to improve both the thermal-oxidation and UV-aging resistance of bitumen, which will remarkably extend the service time of asphalt pavement.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51308203), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20130161120027), the Key Program for International Science and Technology Cooperation Projects of Shaanxi Province (No. 2014KW10-03) and the Fundamental Research Funds for the Central Universities (Hunan University, No. 2012-161). The authors gratefully acknowledge their financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 5 • May 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 7, 2015
Accepted: Oct 7, 2015
Published online: Dec 31, 2015
Published in print: May 1, 2016
Discussion open until: May 31, 2016
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