Recycled Engine Oil Bottoms and Poly-phosphoric acid in TX Binders

In the past year, Texas Department of Transportation (TxDOT) has become increasingly aware that some binder modification activities have negatively impacted the performance of asphalt mixtures, and in turn, expected pavement life. Recent studies have documented the increased use of Recycled Engine Oil Bottoms (REOBs) and Polyphosphoric Acid (PPA) in Texas binders. In the last six months, REOBs have become a subject of national concern. Many state Departments of Transportation (DOTs) in the northeast have placed a complete ban on ROEB’s use in asphalt binders. This could be an over-reaction to the problems encountered, for REOB’s has been used with a small amount by asphalt industry in the last 30 years. Thus, the key question is what is the maximum level of REOB and PPA that can be permitted without reducing performance? This is a critical study for TxDOT. The major project objectives of this study are: (1) Purchase handheld test equipment for accurately determining REOB and PPA content in the field and develop implementation recommendations; (2) Use control samples to develop test procedures and interpretation guidelines to accurately detect and quantify the levels of REOBs and PPA both in the laboratory and the field. Use a minimum of 50 combinations of different sources of asphalt binders and five different sources of REOBs; (3) Recommend maximum allowable level of REOBs for use in asphalt binders through evaluating the engineering properties of standard TxDOT mixes; (4) Conduct a study of the level of REOB currently used in hot applied seal coat binders in Texas; and (5) Recommend a maximum allowable level of REOBs for use in hot applied seal coat binders through evaluating engineering properties of standard TxDOT seal coats.


  • English


  • Status: Completed
  • Funding: $510000
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Glancy, Chris

  • Performing Organizations:

    Texas A&M Transportation Institute, College Station

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135
  • Principal Investigators:

    Zhou, Fujie

  • Start Date: 20150901
  • Expected Completion Date: 20171031
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01619660
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6881
  • Files: RiP, STATEDOT
  • Created Date: Dec 21 2016 4:38PM