(RAS).

Details

• Creators:
  Diefenderfer, Stacey D.
• Corporate Creators:
  Virginia Transportation Research Council (VTRC)
• Corporate Contributors:
  Virginia. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Recycled materials
  • Shingles
  • Asphalt mixtures
  • Asphalt additives
  • Pavement performance
  • Aggregates
  • Waste products (Materials)
  • Asphalt pavements
  • Recycled asphalt shingles
  • SMA
  More +
• Publication/ Report Number:
  FHWA/VTRC 17-R22
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia ; United States
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Description:
  In recent years, there has been increased interest in the use of reclaimed material in asphalt
  
  mixtures. The use of recycled asphalt shingles (RAS) has been of interest because of the high asphalt
  
  content, although this asphalt is considerably stiffer than that typically used in paving mixtures. The
  
  Virginia Department of Transportation has specifications allowing the use of post-manufacturing waste and
  
  post-consumer RAS, although use has been limited. In addition, the specifications do not provide for the
  
  use of RAS in stone-matrix asphalt (SMA). In response to producer requests for RAS use in SMA, this
  
  study investigated the use of RAS in SMA mixtures in VDOT’s Salem and Staunton districts.
  
  Mixtures were sampled during production, characterized, and evaluated using a suite of laboratory
  
  tests including dynamic modulus, flow number, rut depth, and bending beam fatigue. Test results indicated
  
  that, as expected, the inclusion of RAS appears to improve high temperature / low frequency modulus
  
  values and rutting resistance. The inclusion of RAS had mixed effects on the mixture performance in
  
  laboratory fatigue testing. Binder testing on one set of mixtures indicated that the virgin binder grade may
  
  significantly affect the degree of blending of the RAS binder. In addition, extracted binder Tc values
  
  indicated that the inclusion of either RAP or RAS may have adverse impacts on cracking susceptibility.
  
  These findings should be validated with field performance and additional mixtures.
  
  The study recommends that the Virginia Department of Transportation not change specifications to
  
  allow RAS in SMA at this time. In specific situations, the use of RAS in SMA should be approached
  
  judiciously, as when effectively located and properly designed, produced, and placed. RAS mixtures have
  
  the potential for improved rutting performance, although impacts on cracking performance must be
  
  carefully assessed.
• Format:
  PDF
• Funding:
  105229
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32361/dot_32361_DS1.pdf
• File Type:
  [PDF - 749.93 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:49de0ef116b12ae9284351f636492c2a94a6565285f7233fcd72a964fa29415c