Recycled asphalt shingles have been used in paving applications for more than two decades and
have growing acceptance in the industry. The cost of asphalt binder has steadily increased,
fueling pressure to find suitable recycled materials to supplement virgin materials. The
Minnesota Department of Transportation has dedicated several studies for using asphalt shingle
scrap in asphalt pavements. There are two types of shingles that can be used in pavement:
manufacturer waste shingle scrap and tear off shingle scrap. As a result of the studies performed,
the Minnesota Department of Transportation currently allows up to 5% of manufacturer waste
shingle scrap in paving applications. Research on tear off shingle scrap is continuously
developing, and a draft specification from the Minnesota Department of Transportation indicates
that up to 5% can be used in asphalt pavement.
In this thesis, both types of shingles were used in asphalt mixtures that were tested for
performance to determine if the addition of shingles affects the physical properties. In addition,
an environmental analysis was performed. The objective of this research was to determine if it
physically makes sense to use shingles in pavement and to understand the environmental
implications—which include reducing virgin materials which can yield energy savings.
The analysis suggests up to 3% tear off shingle scrap in asphalt mixtures results in an effect on
low temperature properties similar to the addition of up to 5% manufacturer waste shingle scrap,
if combined with recycled asphalt pavement addition of more than 20%. The results of our
research do support previous research efforts regarding the use of recycled asphalt shingles in
pavement; however, based on these results, the Minnesota Department of Transportation draft
specification for the use of tear off shingle scrap in asphalt pavement should state that up to 3%,
not 5%, shingles can be used.
University of Minnesota M.S. thesis. February 2011. Major: Civil Engineering. Advisors: Mihai Marasteanu, Joseph Labuz. 1 computer file (PDF); vi, 74 pages, appendices A-C.
Environmental analysis of using recycled asphalt shingles in pavement applications..
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