Evaluation of Fly Ash Stabilization of Recycled Asphalt Shingles for Use in Structural Fills
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 1
Abstract
The majority of tear-off roofing shingles and manufacturing shingle scraps are currently disposed of as solid waste in landfills. Landfills are also the end place for the majority of coal combustion byproducts like fly ash. In this study, geotechnical properties of recycled asphalt shingles (RAS) stabilized with a self-cementing fly ash (FA) for use as structural fill material were systematically evaluated. Compaction, hydraulic conductivity, compressibility, shear strength, and coefficient of lateral earth pressure at rest () of stabilized RAS were evaluated. The maximum dry unit weight () of RAS:FA mixtures varies between and qualifying them as light-weight fill material and the compaction curves are not sensitive to water content. The hydraulic conductivity of RAS:FA varies between and for FA content varying between 0% and 20% resulting in a largely drainable material. RAS has a friction angle () of 36° and cohesion () of 24 kPa. Addition of 20% FA reduces the to 33° but increases the to 100 kPa making it sufficiently strong as a fill material. However, compared to compacted sand, RAS is highly compressible. Stabilizing RAS with more than 10% of FA, keeps the long-term settlement of a typical highway embankment below the typical settlement limit. Stabilized RAS has a below 0.1 indicating lower lateral pressures behind retaining walls compared to typical soils. Overall results indicate that RAS stabilized with FA has potential as a lightweight material for use as highway embankment fill or retaining wall backfill.
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Acknowledgments
Support for this study was provided by the Recycled Materials Resource Center, which is supported by the Federal Highway Administration. The opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily represent the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 1 • January 2013
Pages: 94 - 104
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 27, 2011
Accepted: Apr 19, 2012
Published online: Apr 23, 2012
Published in print: Jan 1, 2013
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