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WRSC - Research Reports
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WRSC Technical Reports
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Cold Asphalt and Hot In-place Asphalt Recycling Technologies
(2023-01)Virtual site visits and interviews of five key State Departments of Transportation (DOTs) plus the two Federal Lands Highway Divisions, along with material producers and paving contractors that served these agencies were ... -
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Responsible Use of Re-Refined Engine Oil Bottoms (REOB)
(2023-08)Re-refined engine oil bottoms (REOB), also referred to as vacuum tower asphalt extender (VTAE), has been used to modify asphalt binders to improve low temperature rheological properties since the 1980s. Since the introduction ... -
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2023 Northeast Peer Exchange on Balanced Mix Design (BMD): Outcomes Summary
(2023-06)Eight States from the Northeastern U.S. gathered for a peer exchange and discussion on implementation activities to support Balanced Mix Design (BMD). The peer exchange was sponsored by the Federal Highway Administration ... -
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2023 Southeast Peer Exchange on Balanced Mix Design (BMD): Outcomes Summary
(2023-04)Six States from the Southeastern U.S. gathered for a peer exchange and discussion on implementation activities to support Balanced Mix Design (BMD). The peer exchange was sponsored by the Federal Highway Administration ... -
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2023 North Central Peer Exchange on Balanced Mix Design (BMD): Outcomes Summary
(2023-05)Seven States from the North Central U.S. gathered for a peer exchange and discussion on implementation activities to support Balanced Mix Design (BMD). The peer exchange was sponsored by the Federal Highway Administration ... -
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A Practice for Including Intelligent Construction Equipment in Quality Assurance Programs
(2023-01)Many State departments of transportation (DOTs) include density of the asphalt mat as a quality characteristic in their quality assurance (QA) programs. Density values are determined from point-specific laboratory tests. ... -
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Responsible Use of Polyphosphoric Acid (PPA) Modification of Asphalt Binders
(2023-02)Polyphosphoric acid (PPA) has been used to chemically modify asphalt binders to improve high temperature rheological properties, without adversely affecting low temperature rheological properties, since the early 1970s.(1) ... -
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Positive Practices, Lessons Learned, and Challenges When Implementing Balanced Design of Asphalt Mixtures: Site Visits
(2022-03)Virtual site visits and interviews of seven key State Departments of Transportation (DOTs), along with material producers, consultants and paving contractors that serviced the agencies were conducted to learn more regarding ... -
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Recycled Tire Rubber – Hybrid GTR Binders and Dry Added GTR – How to use them in Asphalt Pavement Mixtures.
(2022-02)Addition of ground tire rubber (GTR) to asphalt binder and mixture is an asphalt mixture practice in asphalt production that consumes about 16.5 percent of the total ground tire rubber (GTR) market today. Modification ... -
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Impact of Alternative Asphalt Binder Extenders on Asphalt Mixture Design, Production and Performance
(2018)Historically there has been fluctuations in asphalt binder cost and at times supply shortages. After the 1973 Oil Crisis and 2008 asphalt binder price peak, efforts to responsibly increase the amount of RAP and RAS in ... -
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Successful Use of Reclaimed Asphalt Pavement in Asphalt Mixtures
(UNR Pavement Engineering & Science Program, 2021-07)Over 99 percent of reclaimed asphalt pavement (RAP) is put back to use, with most of it in asphalt pavements. Using RAP in asphalt mixtures can provide initial cost savings by replacing a portion of the aggregate and virgin ...