Polyphosphoric acid in combination with styrene-butadiene-styrene block copolymer - Laboratory mixture evaluation

Thomas Bennert, Jean Valery Martin

Research output: Contribution to journalConference article

12 Scopus citations

Abstract

State Agencies in the United States have known for years the benefits associated with asphalt binders that are modified with elastomer-type polymers to improve the rutting and fatigue cracking properties of the hot mix asphalt. However, in recent years, a majority of asphalt binder suppliers are now using polyphosphoric acid (PPA) in combination with decreased percentages of polymers to meet various performance graded asphalt binder requirements. This has raised concerns among the State Agencies in fear that the combination of PPA and reduced polymer percentages will result in an inferior asphalt binder when compared to the same asphalt binder solely modified by polymer. To help answer this question, a research program was developed to examine and compare the laboratory properties of an asphalt binder modified with and without PPA. Asphalt binder testing, consisting of continuous PG Grading and Multiple Stress Creep Recovery, and asphalt mixture testing, consisting of Dynamic Modulus and Flexural Beam Fatigue tested at both short and long-term aged conditions, as well as repeated load testing to evaluate permanent deformation were conducted on a base binder and the base binder modified in two manners; SBS polymer only and reduced SBS polymer + PPA. The paper presents the findings of the asphalt binder and asphalt mixture evaluation and shows that the use of PPA in formulation with SBS provides an equal performance, with respect to HMA mixture rutting, fatigue performance, and resistance to moisture damage, to the highly SBS modified asphalt binder.

Original languageEnglish (US)
Pages (from-to)773-791
Number of pages19
JournalAsphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions
Volume79
StatePublished - Dec 1 2010
EventAsphalt Paving Technology 2010, AAPT - Sacramento, CA, United States
Duration: Mar 7 2010Mar 10 2010

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Keywords

  • Dynamic modulus
  • Flexural beam fatigue
  • Long term aging
  • Multiple stress creep recovery
  • Polyphosphoric acid
  • SBS polymer
  • Short term aging

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