Comparing Micro- and Macro-level Rheological Properties of Polymeric and RAP modified Asphalt Binders

Multi-scale evaluation of the rheological and mechanical properties of asphalt binder has substantial importance to understand asphalt binder’s micro- and macro-scale properties. This study aims to compare the macro- and micro-scale mechanistic properties of asphalt binders. Test samples used in this study include Performance Grade (PG) binders (PG 64-22) from two different sources along with their modified counterparts. The modifiers include polyphosphoric acid (PPA), styrene-butadiene-styrene (SBS), a combination of SBS and PPA, and reclaimed pavement asphalt (RAP). To achieve the goal of this study, an Atomic Force Microscope (AFM) technology was utilized to estimate the asphalt binder’s micro-mechanical properties [e.g., Derjagin, Muller and Toropov (DMT) Modulus, and deformation]. On the other hand, macro-scale properties such as rutting factor (G*/sinδ), consistency and penetration data of the selected binders were analyzed and compared with the aforementioned micro-level properties. The comparative analyses indicated that the micro-mechanical properties of asphalt binders followed a linear trend with the macro-scale properties. The findings of this study are expected to help researchers and pavement professionals in modeling asphalt materials when multiscale effects deemed to be necessary.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 21p

Subject/Index Terms

Filing Info

  • Accession Number: 01763635
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03573
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:07AM