HNSE-L1-4. Effects of Recycled Asphalt Binder on the Viscosity of Recycled Asphalt Binder and Mixtures

Abdulrahman Alahdal1
Faculty Mentor: Moses Karakouzian, Ph.D.1
1Howard R. Hughes College of Engineering, Department of Civil and Environmental Engineering and Construction

Asphalt pavement is a combination of materials that are typically used in the construction of roads, highways, airports, parking lots, etc. Asphalt pavement consists of asphalt binder, mineral filler, and a mixture of aggregates such as crushed rocks, sand, slags, and gravel. These components are produced with a great deal of energy which results in significant CO2 emissions. In this study, the viscosity of virgin and reclaimed asphalt binders, as well as reclaimed asphalt binders and virgin asphalt binders’ mixtures, are examined according to the testing protocol and specifications of the American Association of State Highway and Transportation Officials (AASHTO). Results from this study will allow reclaimed asphalt to be used in asphalt mixtures to the greatest extent possible. Carbon dioxide (CO2) emissions directly increase as asphalt production grows. As a result of studying the effects, we will be able to increase the proportion of reclaimed asphalt pavement used in new asphalt pavement mixtures, which in turn will decrease the yearly CO2 emissions. To maximize asphalt pavement’s strength and resistance, it is crucial to maintain its viscosity, since asphalt binder is responsible for holding aggregate together. We found that the viscosity of the mixtures containing 5 to 30% reclaimed asphalt binder decreased linearly as the percentage of reclaimed asphalt binder increased. Despite this, specimens with 30 to 50% reclaimed asphalt binder show an increasing viscosity as the amount of reclaimed asphalt binder increases. Accordingly, reclaimed asphalt should account for approximately 5-30% of the total mix of asphalt.

This research was funded by UNLV’s Title III Part F Asian American and Native American Pacific Islander Serving Institution (AANAPISI) program, which is housed within UNLV’s Center for Academic Enrichment and Outreach and funded under grant (P382B160008) from the U.S. Department of Education.


Nov 15 - 19 2021


All Day


HNSE: Lightning Talk Session 1
The Office of Undergraduate Research


The Office of Undergraduate Research


2 Replies to “HNSE-L1-4. Effects of Recycled Asphalt Binder on the Viscosity of Recycled Asphalt Binder and Mixtures”

  1. Interesting project! I had no idea that asphalt was recycled and that creating asphalt has such an effect on the environment. Great job!

  2. Very interesting presentation, and a very important line of inquiry. Most people think that vehicle emissions are the only way that our transportation system contributes to climate change. From your talk, I learned that , to combat climate change, we must not only phase out internal combustion engines but also also examine and enhance the materials we use to construct transportation routes.

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