Standardizing Lightweight Deflectometer Modulus Measurements for Compaction Quality Assurance: Research Summary

Details

• Creators:
  Schwartz, Charles W.
• Corporate Creators:
  Maryland. State Highway Administration
• Subject/TRT Terms:
  • Deflectometers
  • Quality assurance
  • Compaction
  • Paving
  • Modulus of resilience
  • Nuclear density gages
  • Soil compaction
• Publication/ Report Number:
  MD-17-TPF-5-285
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Research summary
• Corporate Publisher:
  Maryland. State Highway Administration. Research Division
• Abstract:
  The mechanistic-empirical pavement design method requires the elastic resilient modulus as the key input for characterization of geomaterials. Current density-based QA procedures do not measure resilient modulus. Additionally, the density-based methods do not incorporate the stiffness changes in unconventional materials over time due to moisture content changes or curing. The high costs associated with the radiation-safe operation of nuclear density gauges (NDG) also encourage the search for an alternative procedure. The Lightweight Deflectometer (LWD) is a portable device that can be used to measure the surface modulus of unbound layers directly in the field. LWDs are being employed for pavement construction QA in a few states but their broader implementation has been hampered by the lack of a widely recognized standard for interpreting the measured stiffness data obtained.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32864/dot_32864_DS1.pdf
• File Type:
  [PDF - 138.94 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:e2b2e7487187d2c5f056e1830fda0179157193f0eb65ecf989a5ada6c739fc9f