Evaluation of the Effect of Flat and Elongated Particles on the Performance of Hot Mix Asphalt Mixtures

Details

• Creators:
  Buchanan, M. Shane
• Corporate Creators:
  National Center for Asphalt Technology (U.S.)
• Subject/TRT Terms:
  • Particles
  • Shape
  • Hot mix asphalt
  • Volumetric analysis
  • Highways
  • Operations and Traffic Management
  • Planning and Forecasting
  • I72: Traffic and Transport Planning
• Publication/ Report Number:
  SSC Rpt 2000-01,, NCAT Rpt 2000-03
• Resource Type:
  Research Paper
• Geographical Coverage:
  United States
• TRIS Online Accession Number:
  00797077
• Corporate Publisher:
  National Center for Asphalt Technology (U.S.)
• Abstract:
  Flat and elongated particles have long been considered undesirable in hot mix asphalt (HMA) mixes due to their tendency to break down during construction and traffic. Currently, the Superpave mix design system currently specifies a maximum limit of 10 percent of flat and elongated particles at the 5:1 ratio for the design aggregate blend. Very few coarse aggregate stockpiles will fail the current 10 percent requirement at a 5:1 ratio. Hence, many agencies have expressed an interest in evaluating the particle shape at a more stringent 3:1 ratio. Before the specification is changed to a 3:1 ratio the effect of the particle shape on performance should be evaluated. Two aggregates (limestone and granite) were evaluated in their ?as-received? state and in two other particle shapes (more cubical, less F&E) obtained from Vertical Shaft Impact (VSI) crushing. The laboratory evaluation included volumetric mix designs, wheel tracking, fatigue testing, and aggregate breakdown determination. The results indicate that the particle shape of the aggregate may influence, to varying degrees, the coarse aggregate breakdown, the rutting susceptibility, and volumetric properties of compacted HMA mixes.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/39058/dot_39058_DS1.pdf
• File Type:
  [PDF - 477.06 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:175c2136cad40ab6a1eaed6ffc8295fbe91357bc62b9bbce4d039eeb4bf64b9c