Evaluation of Recycled Components in Stone Matrix Asphalt Mixes

Stone matrix asphalt (SMA), also called stone mastic asphalt, is a durable, rut-resisting wearing course employing a gap-graded aggregate structure and thick modified asphalt binder, typically with higher asphalt content and fibers. It has improved deformation resistance and durability due to the stone-on-stone structure of the mix. Recycled asphalt pavement (RAP), also called reclaimed asphalt pavement, is previously laid pavement that has been removed and reprocessed. When properly crushed and screened, RAP consists of high-quality, well-graded aggregates coated by asphalt cement. Recycled (or reclaimed) asphalt shingles (RAS) is the reprocessed byproduct of tear-off sheets of roofing shingles. These reclaimed products, along with other alternatives like select plastic wastes, processed tire rubber, and other viable recycled material sources can potentially provide a “win-win” in identifying an end-use for a waste stream and reducing material costs for pavement. Missouri Department of Transportation (MoDOT) has employed the use of RAP and RAS in conventional hot mix asphalt pavements for some time now, along with using the two in SMAs, albeit in limited quantity. This project aims to focus in on the optimal contents for various recyclable materials to be used in SMA mixes.


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    • Status: Active
    • Funding: $320,000
    • Contract Numbers:


    • Sponsor Organizations:

      Missouri Department of Transportation

      1617 Missouri Boulevard
      P.O. Box 270
      Jefferson City, MO  United States  65102
    • Project Managers:

      Breeding, Scott

    • Performing Organizations:

      Missouri Center for Transportation Innovation

      Lafferre Hall
      416 S 6th St.
      Columbia, Missouri  United States  65201
    • Principal Investigators:

      Buttlar, William

    • Start Date: 20200727
    • Expected Completion Date: 20231031
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01784656
    • Record Type: Research project
    • Source Agency: Missouri Department of Transportation
    • Contract Numbers: TR202020
    • Files: RIP, STATEDOT
    • Created Date: Oct 13 2021 11:03AM