Investigating the Effects of SBS Concentration on Overall Performances of Polymer Modified Binders and Mixes

This study investigates the effects of SBS polymer concentration on overall changes in all three performances of a binder. As a first step, one base binder was mixed with SBS polymer at three different percentages (1%, 3% and 5%) in laboratory. Next, the base binder and the three polymer modified binders were tested using respective binder performance tests. To validate the binder performances at mixture level, asphalt concrete samples were also tested through corresponding mixture performance tests. The rutting tests’ results showed that use of polymer improves the rutting performance by reducing non-recoverable creep compliance and increasing elastic recovery. It is also found that this improvement is directly correlated with the amount of polymer used. The 1%, 3%, and 5% SBS modified mixtures have 2-, 5-, and 7- times lower rut depths than the base mixture. The fatigue tests’ results revealed that the SBS polymer modification increases the fatigue life by improving the binder fatigue tolerance limit. The 3% and 5% SBS modified mixtures have about 1.3- and 1.5-times greater fatigue endurance limits than the base mixture.  However, there is no significant improvement observed for using 1% SBS modifier. The low-temperature tests’ results illustrated that the polymer modifier improves the low-temperature performance by increasing stress relaxation rate. Like the fatigue performance, an effective low-temperature performance improvement can only be achieved by adding adequate amount of polymer. The 3% and 5% SBS modified mixtures have failure temperatures, which are 5°C and 10°C lower than the failure temperature of the base mixture.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 18p

Subject/Index Terms

Filing Info

  • Accession Number: 01763656
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-04181
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:08AM