Laboratory Comparison of Wet-mixing and Dry-mixing of Recycled Waste Plastic for Binder and Asphalt Modification

The use of recycled plastic as an extender and modifier of bituminous binder in asphalt mixtures has attracted significant attention in recent times, including the development of commercially available products intended to be either elastomeric and plastomeric in nature. Although the improvement in mechanical properties associated with these products has been demonstrated, a range of practical and logistical issues require further attention, including whether the products should be wet-mixed into the bitumen or dry-mixed by direct addition to the asphalt production plant. Comparison of wet-mixed and dry-mixed binder and mixture results confirmed a significant improvement in most properties, except for fatigue life, which was not significantly affected by recycled plastic modification. Furthermore, the binder and mixture results were generally not statistically different for the wet-mixing and dry-mixing processes. However, the wet-mixing process was associated with higher test result variability, although the sample sizes are too small for this to be considered conclusive. It was concluded that the decision to wet-mix or dry-mix the evaluated recycled plastic products into asphalt mixtures should be based on factors other than the resulting binder or mixture properties, because the results were generally not significantly affected by the mixing process.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 22p

Subject/Index Terms

Filing Info

  • Accession Number: 01763723
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00317
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:09AM