U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
This project was selected as a potential collaborative project between the European Union (EU) and the U.S. Department of Transportation's (DOT) Federal Highway Administration (FHWA) Turner-Fairbank Highway Research Center (TFHRC). [Read more about this partnership.]
For EU Candidates
Selected projects will assess performance of warm-mix asphalt (WMA) with high recycled materials, and should capitalize on the existing experience available in the United States. It is expected that the European Commission (EC) will fund an EC project on this topic and the FHWA will cooperate closely with the contractor selected for the relevant EC funded project.
The United States work on this topic will be conducted onsite at the Turner -Fairbank Highway Research Center.
FHWA’s Every Day Counts (EDC) initiative is rapidly implementing WMA technologies to State and local highway agencies. The biggest potential impact in terms of cost and energy savings is the use of WMA technologies combined with high recycled materials (e.g., reclaimed asphalt pavement and asphalt shingles) content. However, there is no long-term pavement performance information for WMA and high RAP (recycled asphalt pavement) mixtures and specifically the combination of the two technologies. At the same time, major National Cooperative Highway Research Program (NCHRP) projects on WMA (NCHRP Project 9-43) and high RAP mix design (NCHRP 9-46) will conclude, providing guidance for mix design practices with WMA and improved mix design and evaluation of hot-mix asphalt (HMA) with high RAP content. The findings and recommendations of these studies need to be validated in a full-scale research environment in order to provide highway agencies with the utmost comfort level for using WMA combined with recycled materials. Further, six more NCHRP projects are under way to address WMA use and these studies findings and recommendations will need to be validated, as well.
Research is needed to achieve the following objectives:
Planned Research Activities
A top-down approach has been utilized to identify the broad characteristics of a streamlined experimental design in order to complete the loading, analyze the data, and make recommendations within 3 years. The experimental plan will consist of both laboratory and field analysis and testing. The FHWA’s Pavement Materials Laboratories (Aggregate and Petrographic Laboratory, Binder Laboratory, Bituminous Mixtures Laboratory and Chemistry Laboratory will be used to conduct the testing and analysis. In addition, the FHWA may partner with other laboratories to complete laboratory testing. The field testing will be accomplished using FHWA’s Pavement Testing Facility (PTF).
A draft experimental design follows:
1. The Interdependency of Accelerated Loading Frames (ALFs) Operations and Test Pavement Structure
Specific recommendations will be made regarding implementation of high recycled content and WMA mixtures and pavement design based on the findings of this study.
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