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The CURA publications library is currently being digitized by the University of Minnesota Digital Conservancy. When the project is complete, the entire CURA publications library will be online and fully searchable. Unfortunately, during this process we are not able to honor individual requests for publications . Additionally, we no longer have physical copies of publications to send out.

New publications are digitized daily and the publications catalog on the CURA website is not automatically updated with links to scanned copies, so please search the CURA collection at the Digital Conservancy for the publications you are looking for:

Recycling Asphalt Roofing Shingles in Asphalt Pavements.

Marasteanu, Mihai, Jasmine Austin, and Ki Hoon Moon.

Up to one-fifth of construction and demolition waste in the Twin Cities metropolitan area consists of tear-off shingle scrap (TOSS), which is postcon¬sumer roofing material that is removed when a home is reroofed. Of the 60,000 tons of TOSS generated annually in the metro region, more than 90% is potentially recyclable for use in asphalt pavement. At the beginning of 2010, the Minnesota Department of Transportation released a draft specification that would allow up to 5% TOSS to be used in asphalt. To fine-tune this specification, this study inves¬tigated how the addition of TOSS affects the low-temperature properties of asphalt mixtures used for paving roads, as well as the potential environmental benefits of using recycled materials in asphalt. The research showed that adding up to 3% TOSS resulted in no statistically significant differences in the low-temperature properties of the most commonly used asphalt mixtures. A preliminary environmental life-cycle assessment showed that asphalt mixtures that contain recycled shingles and reclaimed asphalt pavement consume less energy and produce fewer greenhouse gas emissions during the production process compared with an asphalt mixture with no recycled material. The highest reduction in these environmental impacts was estimated for the mixtures that used the highest amount of recycled materials. Based on this analysis, all the available TOSS in the Twin Cities metro area could potentially be recycled for use in asphalt pavement in the region. It is anticipated that the results of this research will provide critical information for the development of a standard specification for the use of scrap tear-off shingles in asphalt pavements in Minnesota. The research upon which this article is based was supported by a grant from CURA’s Faculty Interactive Research Program.

CURA Reporter
Publication date: 
Minneapolis: Center for Urban and Regional Affairs, University of Minnesota.
The research upon which this article is based was supported by a grant from CURA’s Faculty Interactive Research Program.
42 (1): 3-6
Online availability
CURA call number: 
Reporter 42 (1)

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