Evaluation of the effects of Recycled Asphalt Shingle on binder rheological properties using the wet process

Document Type

Conference Proceeding

Publication Date

1-1-2013

Abstract

The EPA estimates that each year around 11 million tons of asphalt shingles are disposed in landfills in the US. In recent years, considerable attention was observed in using Recycled Asphalt Shingle (RAS) in asphalt paving construction. This study presents a new approach to recycle asphalt shingle, which is referred to as the wet process. In the wet process, RAS is ground to ultra-fine particle sizes and blended with asphalt binder at high temperature prior to mixing with the aggregates. The objective of this study is to present the proposed wet process and to investigate the effects of adding ground shingle using the wet process on the binder rheological behaviors. Based on the results of the experimental program, it was determined that the use of RAS from tear-off and manufacturer waste shingles resulted in an increase in viscosity ranging from 3 to 130% when compared to the base binder. The increase in viscosity was proportional to the RAS content with greater increase at a RAS content of 30%. The increase in viscosity for the blends prepared with RAS from tear-off was greater than for the blends prepared with RAS from manufacturer waste. This may be due to the loss of light components in RAS from tear-off during service.

Publication Source (Journal or Book title)

ISEC 2013 - 7th International Structural Engineering and Construction Conference: New Developments in Structural Engineering and Construction

First Page

661

Last Page

665

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