Structural evaluation of asphalt pavements with full-depth reclaimed base.

Details

• Creators:
  Tang, Shuling ; Cao, Yuejian ; Labuz, Joseph F.
• Corporate Creators:
  University of Minnesota. Dept. of Civil Engineering
• Subject/TRT Terms:
  • Pavement design
  • Granular bases
  • Full-depth reclamation
  • Falling weight deflectometers
  • Stiffness tests
  • Asphalt pavements
  • Base course (Pavements)
  • Freeze thaw durability
  • Structural analysis
• Publication/ Report Number:
  MN/RC 2012-36
• Resource Type:
  Tech Report
• Geographical Coverage:
  Minnesota
• Corporate Publisher:
  Minnesota. Dept. of Transportation. Research Services Section
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Design
• Abstract:
  Currently, MnDOT pavement design recommends granular equivalency, GE = 1.0 for non-stabilized full-depth ; reclamation (FDR) material, which is equivalent to class 5 material. For stabilized full-depth reclamation (SFDR), ; there was no guideline for GE at the time this project was initiated (2009). Some local engineers believe that GE of ; FDR material should be greater than 1.0 (Class 5), especially for SFDR. In addition, very little information is ; available on seasonal effects on FDR base, especially on SFDR base. Because it is known from laboratory studies ; that SFDR contains less moisture and has higher stiffness (modulus) than aggregate base, it is assumed that SFDR ; should be less susceptible to springtime thawing. ; Falling Weight Deflectometer (FWD) tests were performed on seven selected test sections on county roads in ; Minnesota over a period of three years. During spring thaw of each year, FWD testing was conducted daily during ; the first week of thawing in an attempt to capture spring thaw weakening of the aggregate base. After the spring ; thaw period, FWD testing was conducted monthly to study base recovery and stiffness changes through the ; seasons. ; GE of SFDR was estimated using a method established by MnDOT using FWD deflections, and the GE of SFDR is ; about 1.5. The value varies from project to project as construction and material varies from project to project. All ; the materials tested showed seasonal effects on stiffness. In general, the stiffness is weaker in spring than that in ; summer and fall.
  More +
• Format:
  PDF
• Funding:
  (C) 89261 (WO) 156
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26072/dot_26072_DS1.pdf
• File Type:
  [PDF - 1.35 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:95df03e88f16fd4c69fd5ec518585f9001f564180d3fbd7bc465f8d046d9f71233ca5c508c064666f82887a7e242315143f78febd29d228cbb438f0fb4fbfec2