Long term pavement performance computed parameter : moisture content

Details

• Creators:
  Zollinger, Dan ; Lee, S. ; Puccinelli, J. ; Jackson, N.
• Corporate Creators:
  Nichols Consulting Engineers
• Corporate Contributors:
  Texas A&M University. Zachry Department of Civil Engineering ; United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development ; Long-Term Pavement Performance Program (U.S.)
• Subject/TRT Terms:
  • Pavement performance
  • Moisture content
  • Descriptive statistics
  • Soil profiles
  • Dry density
  • Reflectivity
  • Permeability coefficient
  • Pavements
  • Performance
  • Moisture
  More +
• Publication/ Report Number:
  FHWA-HRT-08-035 ; 1236.10
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report Jul 2005 to Sep 2007
• Contracting Officer:
  Larry Wiser
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  A study was conducted to compute in situ soil parameters based on time domain reflectometry (TDR) traces obtained ; from Long Term Pavement Performance (LTPP) test sections instrumented for the seasonal monitoring program (SMP). ; Ten TDR sensors were installed in the base and subgrade layers at each of the 70 SMP test sites monitored as part of the ; LTPP program. A comprehensive description of a new method developed as part of the study to estimate moisture ; content, dry density, reflectivity, and conductivity of the soil from TDR traces is provided in the report. This new ; method utilizes transmission line equations and micromechanics models calibrated to site-specific conditions for each ; site/layer combination. Background information on existing empirical methodologies used to estimate subsurface ; moisture content from TDR traces is also documented. The results were compared to previous methods as well as ; ground truth data to evaluate the ability of the new model to predict soil parameters. The transmission line equation and ; micromechanics method was found to provide accurate results and was used to interpret over 270,000 TDR records ; stored in the LTPP database. A computer program (MicroMoist) was developed to aid in the computation of soil ; parameters based on TDR trace data and calibration information. Details on the program are provided along with ; descriptions of the tables developed to store the computed values in the LTPP Information Management System ; database.
  More +
• Format:
  PDF
• Funding:
  DTFH61-02-D-00139
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/771/dot_771_DS1.pdf
• File Type:
  [PDF - 870.71 KB]
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:cfb89cbc7092e87ce70c2adf183b68767b0fa06d33d618bbc11088854a3466944ccbf9d3b22cf0b2c085b173350d99133aed7265df48fe6eb7c21739fafcf83d