Variability and Characteristics of Recycled Asphalt Shingles Sampled from Different Sources
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
While the recycling of asphalt shingles is beneficial in reducing the consumption of virgin materials, pavement performance should not be compromised. One major concern with recycled asphalt shingles (RAS) relates to the variability in the properties of the recycled materials originating from different sources. In addition, the rheological properties of RAS have not been evaluated as well as its influence on the virgin binder when used in asphalt mixtures. Therefore, the objectives of this study were to characterize the rheological properties and molecular fractions of RAS materials sampled from different sources around the country. In addition, the influence of RAS on the Superpave Performance Grade (PG) of the binder was investigated. Results of the experimental program indicated that the asphalt cement (AC) content in tear-off shingles was consistent among different RAS sources across the country. However, AC content in manufacturer waste shingles was noticeably lower than in tear-off shingles. In addition, all extracted RAS binders were graded as PG 118 or higher using the Superpave binder specification system but the low temperature grade was not measurable due to the high stiffness of the binder. This stiff behavior is due to the binder used in shingle manufacturing, which is an air-blown asphalt binder with stiff characteristics and low elongation properties. Results showed that at a RAS content of up to 5%, the high temperature grade of the blends was increased by one to seven grades and the low temperature grade was increased by one grade. The use of binder blending charts is recommended to account for the influence of RAS in the mix design. At a RAS content of 10%, the binder blends did not pass the Superpave criterion at low temperature.
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Acknowledgments
This research was funded through the National Science Foundation (Grant No. CMMI-1030184). The authors would like to acknowledge the assistance of G. Anderson, S. Salari, and S. Cooper of Louisiana State University and W. Gueho of LTRC.
References
AASHTO. (2011a). “Standard method of test for quantitative extraction of asphalt binder from hot mix asphalt (HMA).”, Washington, DC.
AASHTO. (2011b). “Sieve analysis of fine and coarse aggregate.”, Washington, DC.
AASHTO. (2011c). “Standard practice for design considerations when using Reclaimed Asphalt Shingles (RAS) in New Hot-Mix Asphalt (HMA).”, Washington, DC.
AASHTO. (2011d). “Standard specification for performance-graded asphalt binder.”, Washington, DC.
Al-Qadi, I. L., Elseifi, M. A., and Carpenter, S. (2007). “Reclaimed asphalt pavement—A literature review.”, Illinois Center for Transportation, Urbana, IL.
Button, J. W., Williams, D., and Scherocman, J. A. (1995). “Shingles and toner in asphalt pavements.”, Texas Transportation Institute, College Station, TX.
Construction Materials Recycling Association (CMRA). (2007). Recycling tear-off asphalt shingles: Best practices guide, Dan Krivit and Associates, St. Paul, MN.
Construction Materials Recycling Association. (2010). “Asbestos in asphalt shingles.” 〈http://www.shinglerecycling.org/content/asbestos-asphalt-shingles〉 (Mar. 2012).
Davis, J. (2009). “Roofing the road—Using asphalt shingles as binder, asphalt.” Asphalt: The magazine of the Asphalt Institute, Asphalt Institute, Lexington, KY.
Elseifi, M. A., Salari, S., Mohammad, L. N., Hassan, M., Daly, W., and Dessouky, S. (2012). “A new approach to recycle asphalt shingles in hot mix asphalt.” J. Mater. Civ. Eng., 24(11), 1403–1411.
Foo, K. Y., Hanson, D. I., and Lynn, T. A. (1999). “Evaluation of roofing shingles in hot mix asphalt” J. Mater. Civ. Eng., 15–20.
Gevrenov, J. (2008). “Recycling shingles into roads, US EPA perspective. Presentation made at the Missouri showcase.” Utilization of Recycled Asphalt Shingles in Hot-Mix Asphalt, Missouri Department of Transportation, Joplin, Missouri.
Hassan, M. M. (2008). “SDFlex: A framework for the assessment and construction of sustainable flexible pavements.” J. Green Build., 3(3), 1–11.
Malik, R., Teto, M. R., and Mogawer, W. (2000). “Evaluation of use of manufactured waste asphalt shingles in hot mix asphalt.”, Chelsea Center for Recycling and Economic Development, Univ. of Massachusetts, Lowell, MA.
Marks, V. J., and Petermeier, G. (1997). “Let me shingle your roadway.” Transportation Research Record 1589, Transportation Research Board, National Research Council, Washington, DC, 54–57.
Maupin, G. W. (2010). “Investigation of the use of tear-off shingles in asphalt concrete.”, Virginia Transportation Research Council, Charlottesville, VA.
National Association of Home Builders. (1998). “From roofs to roads: Recycling asphalt roofing shingles into paving materials.” NAHB Research Center, Upper Marlboro, MD.
Northeast Recycling Council, Inc. (2007). “Asphalt shingles waste management in the Northeast—Fact sheet.
Recycled Materials Resource Center. (2007). “User guidelines for byproducts and secondary use materials in pavement construction.” 〈http://www.rmrc.unh.edu/tools/uguidelines/index.asp〉 (Feb. 2011).
RoofHelp.com. (2010). “Roof types—Asphalt composition shingle roofing information.” 〈http://www.roofhelp.com/choices/asphaltshingles/〉 (April 2011).
Shen, J., Amirkhanian, S., and Xiao, F. (2006). “High-pressure gel permeation chromatography of aging of recycled crumb rubber-modified binders with rejuvenating agents.” Transportation Research Record 1962, Transportation Research Board, National Research Council, Washington, DC.
U.S. Environmental Protection Agency. (1994). “Evaluation of ecological impacts from highway development.” EPA 300-B-94-006, Washington, DC.
World Bank. (1996). “The impact of environmental assessment: Second environmental assessment review of projects.” Environment Dept., Washington, DC.
Zhou, F., Button, J. W., and Epps, J. A. (2012). “Best practice for using RAS in HMA.”, Texas Transportation Institute, College Station, TX.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 4 • April 2014
Pages: 748 - 754
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 21, 2012
Accepted: Jun 12, 2013
Published online: Jun 15, 2013
Discussion open until: Nov 15, 2013
Published in print: Apr 1, 2014
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