Application of a Biomodifier as Fog Sealants to Delay Ultraviolet Aging of Bituminous Materials
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 12
Abstract
This study examines the merits of applying a biomodifier (Bio-binder, Sustainable Infrastructure Material Lab, NC A&T State University, Greensboro, North Carolina) as a fog sealant on the surface of bituminous materials to delay aging specifically caused by ultraviolet (UV) radiation during pavement service life. This study uses four types of bituminous-based materials: an asphalt binder [Performance Grade (PG 64-22) and three types of crack sealants with varying polymer content and different viscosities. Materials were prepared in small samples on aluminum plates and aged under continuous UV and UV/moisture/condensation conditioning. Changes in the chemical characteristics of the materials were then analyzed using Fourier-transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. The results show that the oxygen uptake of bituminous materials after exposure to UV aging are significantly lower in specimens covered with Bio-binder compared with uncoated ones. The complex modulus and creep compliance were measured using a dynamic shear rheometer. The complex modulus for asphalt binder samples showed an increase that could be due to partial diffusion of the biomodifier in the specimens. However, in sealant samples in which the Bio-binder was removed prior to performing the experiments, the shear modulus showed a significant decrease, indicating that the sealants covered with Bio-binder remained softer compared with the uncovered samples. The results also showed a higher nonrecoverable creep compliance and a lower percent recovery at 3.2 kPa strain rate for specimens coated by Bio-binder compared with the samples with no coating, showing that the fog sealant can effectively improve properties of the sealant samples. Overall, the findings demonstrate that Bio-binder can be a promising candidate to be used as a fog sealant for bituminous binder and crack sealants to delay UV aging.
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Acknowledgments
This research was sponsored by TRB Fellow Program, Center for Highway Pavement Presentation (CHPP) at NC A&T as well as Columbia University. The authors would also like to acknowledge Dr. Xiaokong Yu from Columbia University for reviewing the manuscript and helping with EDX measurements. The contents of this paper reflect the view of the authors, who are responsible for the facts and the accuracy of the data presented. This paper does not constitute a standard, specification, or regulation.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 4, 2018
Accepted: Apr 26, 2018
Published online: Sep 17, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 17, 2019
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