United States Department of Transportation
i
Recycled Engine Oil Bottoms and Polyphosphoric Acid in Texas Binders [Project Summary]
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2017-10-31
[PDF-387.00 KB]
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Edition:Project Completed: 10-31-2017
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Abstract:A Superpave performance grade (PG) binder specification was one of the products from the Strategic Highway Research Program (SHRP). Many state departments of transportation have adopted the Superpave PG specification since the completion of SHRP in 1993. A much wider range of crude oil sources are now being used to produce asphalt binders. Materials such as re-refined engine oil bottoms (REOB), polyphosphoric acid (PPA), bio-binders, and ground tire rubber (GTR) are increasingly being used to formulate and manufacture asphalt binders for pavement mixtures and asphalt seal coat binders. Although asphalt binders used these days still meet the requirements of the PG specification, many highway agencies in the United States are increasingly experiencing premature failures of newly constructed pavements. These failures include distresses such as low- and intermediate-temperature cracking and raveling, aggregate loss, and instances of total surface course loss within five years. Many pavement engineers express concerns about embrittlement and a lack of adhesion and tackiness of the asphalt binders. The Texas Department of Transportation (TxDOT) has become increasingly aware of these issues so that new research on REOB was initiated to address it in 2015.
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