Field Test of a Polyphosphoric Acid (PPA) Modified Asphalt Binder on Rt. 1 in Perry

The Maine Department of Transportation (MaineDOT) uses the Superpave hot mix asphalt process and specifies asphalt binder grades using the Performance Grade criteria. The Department mainly uses asphalt binder grade PG 64-28. In order to create the properties of PG binder, polyphosphoric acid (PPA) is sometimes added to the asphalt. It is widely recognized in the industry that the addition of PPA to asphalt can increase the high temperature PG grade to the next higher grade. However, there are concerns among transportation agencies that this PPA could alter the long term performance of the asphalt binder. One of the major asphalt suppliers to MaineDOT paving projects uses PPA to alter their PG58-28 neat asphalt binder into a PG64-28. An experimental construction study was established to field test the long term performance of PPA modified PG64-28 and compare it to the PG58-28 neat asphalt binder. A highway reconstruction project, NH-1000(800)E, along Rt. 1 in Perry, Maine was selected as a suitable site for this comparison. The section having the PG 64-28 binder has been in service approaching six years. Based on the observations from the ARAN images, both test sections are performing well. There are no obvious signs of early pavement distress. The concerns about potential deterioration that might be caused by the addition of PPA additive have not been observed on these test sections as of this date.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Maps; Photos; Tables;
  • Pagination: 7p

Subject/Index Terms

Filing Info

  • Accession Number: 01596003
  • Record Type: Publication
  • Report/Paper Numbers: Technical Report 13-03
  • Created Date: Mar 2 2016 7:47AM