Chemical Characterization of Recycling Agents
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
Modification of aged binders by the use of recycling agents is significantly influenced by the chemical compositions of these agents. Despite the widespread use of recycling agents, the effect of their chemical properties on the modification process of aged binders cannot be fully found by referencing the reported studies. Recently, the National Center for Asphalt Technology (NCAT) categorized the recycling agents in five main groups. This paper addresses the chemical characteristics of recycling agents in each group by employing saturate, aromatic, resin, and asphaltene (SARA) analysis, Fourier-transform infrared spectroscopy (FT-IR), and elemental analysis. The test results and analyses revealed that the aromatic extracts were similar in chemical composition and bond with virgin unmodified binders. In addition, the results showed that the chemical nature of triglycerides/fatty acids and tall oils might increase the moisture susceptibility and accelerate the degradation of the asphalt binder. The SARA analysis indicated that the compatibility between paraffinic and naphthenic oils with the binder might be a concern; however, the level of oxygen content was low, and these agents did not contain chemical bonds sensitive to moisture and aging.
Get full access to this article
View all available purchase options and get full access to this article.
Data Availability Statement
All data generated or used during the study appear in the published article.
Acknowledgments
This research study was funded by the Nebraska Department of Transportation (NDOT) and performed under Award No. SPR-P1(20) M116.
References
Chapman, O. 1963. “Spectrometric identification of organic compounds.” J. Am. Chem. Soc. 85 (20): 3316. https://doi.org/10.1021/ja00903a077.
Coates, J. 2000. “Interpretation of infrared spectra, a practical approach.” In Encyclopedia of analytical chemistry, 10815–10837. Chichester, UK: Wiley.
Haghshenas, H. 2018. “Chemical-physical-mechanical characterization of aging and restoration of asphaltic materials in different length scales.” Ph.D. dissertation, Dept. of Civil and Environmental Engineering, Univ. of Nebraska-Lincoln.
Haghshenas, H., Y.-R. Kim, S. R. Kommidi, D. Nguyen, D. F. Haghshenas, and M. D. Morton. 2018a. “Evaluation of long-term effects of rejuvenation on reclaimed binder properties based on chemical-rheological tests and analyses.” Mater. Struct. 51 (5): 134. https://doi.org/10.1617/s11527-018-1262-4.
Haghshenas, H., Y.-R. Kim, M.-D. Morton, T. Smith, M. Khedmati, and D. Haghshenas. 2018b. “Effect of softening additives on the moisture susceptibility of recycled bituminous materials using chemical-mechanical-imaging methods.” J. Mater. Civ. Eng. 30 (9): 04018207. https://doi.org/10.1061/(ASCE)MT.1943-5533.0002405.
Hagos, E. T. 2008. “The effect of aging on binder properties of porous asphalt concrete.” Ph.D. dissertation, Dept. of Civil and Geosciences, Delft Univ. of Technology.
Kaseer, F., F. Yin, E. Arámbula-Mercado, and A. Epps Martin. 2017. “Stiffness characterization of asphalt mixtures with high recycled material content and recycling agents.” Transp. Res. Rec. 2633 (1): 58–68. https://doi.org/10.3141/2633-08.
NCAT (National Center for Asphalt Technology). 2014. Researchers explore multiple uses of rejuvenators. Auburn, AL: NCAT.
Zaumanis, M., R. Mallick, and R. Frank. 2013. “Evaluation of rejuvenator’s effectiveness with conventional mix testing for 100% reclaimed asphalt pavement mixtures.” Transp. Res. Rec. 2370 (1): 17–25. https://doi.org/10.3141/2370-03.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 17, 2019
Accepted: Oct 21, 2019
Published online: Mar 2, 2020
Published in print: May 1, 2020
Discussion open until: Aug 2, 2020
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.