U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| Project Information | ||
| Project ID: | FHWA-PROJ-06-0028 | |
| Project Name: | Asphalt Modification with Phosphoric Acid | |
| Project Status: | Completed | |
| Start Date: | December 6, 2006 | |
| End Date: | February 20, 2014 | |
| Contact Information | ||
| Last Name: | Arnold | |
| First Name: | Terry | |
| Telephone: | 202-493-3305 | |
| E-mail: | terry.arnold@dot.gov | |
| Office: | Office of Infrastructure Research and Development | |
| Team: | Pavement Materials Team [HRDI-10] | |
| Program: | Turner-Fairbank Highway Research Center | |
| Laboratory: | Binder Laboratory | |
| Project detail | ||
| Roadmap/Focus area(s): | Infrastructure Research and Technology Strategic Plan and Roadmap | |
| Project Description: | This project continues ongoing research activity that will provide guidance to State agencies and industry partners on the appropriate use of phosphoric acid as an asphalt modifier. Issues still not clearly resolved are the reaction of phosphoric acid with asphalt from different crude sources, reaction with lime and limestone aggregates, and the effect on rutting and fatigue. The comparison of phosphoric acid modification with polymer modification needs to be augmented. There are also unresolved forensic issues in New York State concerning phosphoric acid and premature pavement failures. Until this is resolved, other State agencies will likely reject the use of this potentially cost-saving additive. | |
| Goals: | Material characterization. | |
| Product Type: | Research report | |
| Test Methodology: | Various chemical and spectroscopic techniques, including x-ray fluorescence, ion-exchange chromatography, atomic absorption spectroscopy, and infrared spectroscopy. | |
| Expected Benefits: | The expected benefit is reduced construction costs by using phosphoric acid as an alternative to polymer modification. Currently there is a shortage of Styrene-Butadiene-Styrene for modifying asphalt binders, so there is a dire need to identify modes of asphalt modification that fill this gap. In many circumstances, phosphoric acid modification has this potential. | |
| Deliverables: | Name: Guidance on use of polyphosphoric acid as an asphalt modifier. Product Type(s): Research report Description: Final report providing best practice guidelines for the use of phosphoric acid to modify asphalt. | |
| FHWA Topics: | Roads and Bridges--Pavement and Materials | |
| TRT Terms: | Asphalt Modification Phosphoric Acid Infrastructure Asphalt Pavements Binders Styrene Butadiene Styrene Research |
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| FHWA Disciplines: | Pavement and Materials |
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| Subject Areas: | Materials |
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