(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)
• Abstract:
  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.
  More +
• 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