Reducing roughness in rehabilitated asphalt concrete (AC) pavements

Details

• Corporate Creators:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt concrete pavements
  • Pavement maintenance
  • Mix design
  • Roughness
  • Instruments for measuring roughness
  • International Roughness Index (IRI)
  • Long term pavement performance (LTPP)
• Publication/ Report Number:
  FHWA-RD-98-149
• Resource Type:
  Research Paper
• Geographical Coverage:
  United States
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  A recently completed study entitled, "The Investigation of Development of Pavement Roughness" (FHWA-RD-97-147), initiated by the Long Term Pavement Performance (LTPP) program, provides an answer to the question of how much different rehabilitation treatments reduce roughness. A component of the study investigated selected asphalt concrete (AC) rehabilitation treatment factors in reducing roughness. Specific factors considered include: overlay mix type (recycled and virgin), overlay thickness, and surface preparation of the existing AC surface prior to overlay (minimal and intensive preparation). Key findings were as follows: regardless of the roughness before overlay, the roughness for each test section at a site after the overlay fell within a relatively narrow band, the range of which varied from project to project; even thin overlays substantially reduced the roughness of a pavement; and 85% of the sections that received either a 50-mm or 125-mm AC overlay had an International Roughness Index (IRI) of less than 1.2 m/km. 4 p.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/14313/dot_14313_DS1.pdf
• File Type:
  [PDF - 69.99 KB]
• Collection(s):
  Federal Highway Administration ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:71b19d91cc6f4b104f59a63527595ed15784fb245c6a4820092c8757f1f2c1d57de07028da7ff60076edf9b80c4d87febd14a800803ee1731863dbc53c5e7c75