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:
  Asphalt Pavements Base Course (Pavements) Falling Weight Deflectometers Freeze Thaw Durability Full-depth Reclamation Granular Bases Pavement Design Stiffness Tests 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.
  
  
• Format:
  PDF
• Funding:
  (C) 89261 (WO) 156
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:02541be76e1339899fb277b9285da1e386a22b5aede40a27580995bd4e1e6e2f
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26072/dot_26072_DS1.pdf
• File Type:
  [PDF - 1.35 MB ]