Evaluation of Guidelines for Subgrade Treatments

Details

• Creators:
  Chou, Eddie ; Fournier, Laurent ; Wielinski, Jason ; Rao, Chetana ; Titus-Glover, Leslie
• Corporate Creators:
  University of Toledo. Dept. of Civil Engineering ; Applied Research Associates, Inc.
• Corporate Contributors:
  Ohio. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Pavements
  • Subgrade (Pavements)
  • Subgrade materials
  • Soils
  • Soil stabilization
  • Deflection
  • Guidelines
  • Pavement
  • Subgrade
  • Treatment
  More +
• Publication/ Report Number:
  FHWA/OH-2005/003
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Edition:
  Final report.
• Corporate Publisher:
  Ohio. Dept. of Transportation
• Abstract:
  ODOT has recently developed guidelines for subgrade treatments to be used during plan ; development and construction. This study evaluates these guidelines by comparing them with ; existing guidelines developed elsewhere and validating them through comparison of the actual ; treatment methods and quantities used with those suggested by the guidelines. Soil boring data ; and construction record from 7 reconstruction and 2 new construction projects were obtained. ; Actual treatment methods and quantities were obtained from the project field offices. Dynaflect ; deflection data, when available, were analyzed to determine their usefulness in subsurface ; assessments. GB1 criteria for excess moisture content predicted the undercut quantity reasonable ; well, but the criteria for acceptable moisture content tend to under predict the undercut quantity in ; many cases, likely due to increased soil moisture content after removal of existing pavement. For ; reconstruction projects, the average undercut depths (i.e., the overall undercut quantities) versus ; the corresponding SPT NL values seem to fall reasonably well within the upper bound provided in ; the Section 204 guidelines. However, the actual undercut depths vary significantly even for soils ; with similar or same NL values. Actual undercut depth and quantity are somewhat correlated with ; the average SPT NL value, Dynaflect W5 deflection, and soil moisture content. The regression ; equation developed has a coefficient of determination (or R-square value) as high as 0.71.
  More +
• Format:
  PDF
• Funding:
  State Job No. 147140
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/20519/dot_20519_DS1.pdf
• File Type:
  [PDF - 1.22 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:1f0f99d66dc46b42aeac1cea06d5d884d881a7ab07e9d02fdedcdaa8d6f2ae4573813d7f6aed863bbccc1e03b75231a94999822f719416ea87426c3cbd6f5fca