Designing Recycled Hot Mix Asphalt Mixtures Using Superpave Technology
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Designing Recycled Hot Mix Asphalt Mixtures Using Superpave Technology

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English
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  • Creators:
  • Subject/TRT Terms:
  • DOI:
  • Resource Type:
    Tech Report
  • TRIS Online Accession Number:
    00737828
  • Corporate Publisher:
    National Center for Asphalt Technology (U.S.)
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
  • Abstract:
    Mix design procedures for recycled asphalt pavements require the selection of

    virgin asphalt binder or recycling agent. This research project was undertaken

    to develop a procedure for selecting the performance grade (PG) of virgin

    asphalt binder based on the Superpave PG grading system. Blending charts,

    similar to the viscosity blending charts, were constructed and evaluated based

    on test parameters obtained from the dynamic shear rheometer (DSR). The

    criteria for selection was based on Superpave peformance grading (PG)

    specification, for example, G*/sin(delta)=1kPa minimum for unconditioned asphalt

    binder, G*/sin(delta)6=2.2kPa minimum for rolling thin film oven (RTFO) residue,

    G*sin(delta)=5MPa maximum for RTFO and pressure aging vessel (PAV) residue. The

    criteria based on the fatigue parameter (G*sin(delta)=5MPa maximum for RTFO+PAV

    residue) was determined to be too liberal and, therefore, was not recommended.

    An alternative criteria based on the high temperature stiffness[G*/sin(delta)]

    was recommended.

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