Asphalt Binder Modification: MnROAD Field Investigation of Polyphosphoric Acid Modified Asphalt
This MnROAD study built upon the findings of previous Federal Highway Administration research to 
conduct a field trial assessing the performance of Polyphosphoric Acid (PPA) over a 5-year period. PPA has been used for 30 years to stiffen asphalt pavement. Recent research by the FHWA and MnROAD hope to establish mutual cost-effectiveness and asphalt strength to provide a better utilization method for PPA.
Work Plans
Reports and Publication
- Phosphorus Nuclear Magnetic Resonance Testing of Asphalt Binders (pdf)
- March 2012 FHWA TechBrief: "The Use and Performance of Asphalt Binder Modified with Polyphosphoric Acid (PPA)" (pdf)
- January 2012 Transportation Research Circular: "Polyphosphoric Acid Modification of Asphalt Binders: A Workshop" (pdf)
- August 2010 Phosophorous-31 NMR Studies of MnROAD Test Track Cells (pdf)
- March 2010 MnROAD PPA Interim Report (doc)
- Laboratory Evaluation of Asphalt Binders and Mixtures Containing Polyphosphoric Acid
- Low Temperature Fracture Properties of Poly-Phosphoric Acid Modified Asphalt Mixtures (doc)
- Fracture Properties and Fatigue Cracking Resistance of Asphalt Binders (pdf)
- Fatigue Characterization Test for MnROAD PPA Modified Mixtures (doc)
Presentations
- 2009 PPA Workshop
- July 2008 Petersen Conference: Polyphosphoric Acid Modified Asphalt in Conjunction with Lime as an Anti-stripping Agency (pdf)