Performance-based quality assurance/quality control (QA/QC) acceptance procedures for in-place soil testing phase 3.

Details

• Creators:
  Glagola, Charles ; Rilko, Wayne ; Agdas, Duzgun ; Avila, Luis ; Zheng, Xi ; Patel, Jay
• Corporate Creators:
  University of Florida
• Subject/TRT Terms:
  • Quality assurance
  • Quality control
  • Soil tests
  • Equipment tests
  • Deflectometers
  • Cone penetrometers
  • Nuclear density gages
  • Modulus of resilience
  • Moisture content
  • Stiffness
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• Publication/ Report Number:
  BDV31-977-25
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  One of the objectives of this study was to evaluate soil testing equipment based on its capability of measuring in-place stiffness or modulus values. ; As design criteria transition from empirical to mechanistic-empirical, soil test methods and equipment that measure properties such as stiffness and ; modulus and how they relate to Florida materials are needed. Requirements for the selected equipment are that they be portable, cost effective, ; reliable, accurate, and repeatable. A second objective is that the selected equipment measures soil properties without the use of nuclear materials. ; The current device used to measure soil compaction is the nuclear density gauge (NDG). Equipment evaluated in this research included lightweight ; deflectometers (LWD) from different manufacturers, a dynamic cone penetrometer (DCP), a GeoGauge, a Clegg impact soil tester (CIST), a Briaud ; compaction device (BCD), and a seismic pavement analyzer (SPA). Evaluations were conducted over ranges of measured densities and moistures. ; Testing (Phases I and II) was conducted in a test box and test pits. Phase III testing was conducted on materials found on five construction projects ; located in the Jacksonville, Florida, area. ; Phase I analyses determined that the GeoGauge had the lowest overall coefficient of variance (COV). In ascending order of COV were the ; accelerometer-type LWD, the geophone-type LWD, the DCP, the BCD, and the SPA which had the highest overall COV. As a result, the BCD and ; the SPA were excluded from Phase II testing. ; In Phase II, measurements obtained from the selected equipment were compared to the modulus values obtained by the static plate load test (PLT), ; the resilient modulus (MR) from laboratory testing, and the NDG measurements. To minimize soil and moisture content variability, the single spot ; testing sequence was developed. At each location, test results obtained from the portable equipment under evaluation were compared to the values ; from adjacent NDG, PLT, and laboratory MR measurements. Correlations were developed through statistical analysis. Target values were ; developed for various soils for verification on similar soils that were field tested in Phase III. ; The single spot testing sequence also was employed in Phase III, field testing performed on A-3 and A-2-4 embankments, limerock-stabilized ; subgrade, limerock base, and graded aggregate base found on Florida Department of Transportation construction projects. ; The Phase II and Phase III results provided potential trend information for future research—specifically, data collection for in-depth statistical ; analysis for correlations with the laboratory MR for specific soil types under specific moisture conditions. With the collection of enough data, ; stronger relationships could be expected between measurements from the portable equipment and the MR values. ; Based on the statistical analyses and the experience gained from extensive use of the equipment, the combination of the DCP and the LWD was ; selected for in-place soil testing for compaction control acceptance. Test methods and developmental specifications were written for the DCP and ; the LWD. The developmental specifications include target values for the compaction control of embankment, subgrade, and base materials.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28722/dot_28722_DS1.pdf
• File Type:
  [PDF - 11.33 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:82c391fcaa0fa1970a12bbd89eb6a31a605ac4cfde2b7cbf8e21d0c7abc51a21