Evaluation of In Situ Modulus of Compacted Subgrades Using Portable Falling Weight Deflectometer and Plate-Bearing Load Test

The portable falling weight deflectometer (PFWD) test, which allows dynamic load simulation, was adopted for well-compacted subgrade material characteristic evaluation (in situ modulus). An ideal elastic body was found in a well-compacted subgrade and a dynamic load assumption was found in falling energy. Subgrade reaction coefficient was evaluated through use of static plate-bearing load test (PBLT). At two different highway construction sites (A and B) on well-compacted subgrades, 22 points were tested using the PBLT and the PFWD test. Six different dynamic load levels were produced through three falling weights and heights. The subgrade reaction coefficient in the well-compacted subgrade and the dynamic deflection modulus reasonable linear correlation is shown through test results. Results also show that falling energy variation does not significantly effect dynamic deflection modulus. Significant cost savings could be realized through PFWD application as a PBLT alternative method, as well as for compaction control.

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  • Authors:
    • Kim, Jong Ryeol
    • Kang, Hee Bog
    • Kim, Daehyeon
    • Park, Dal Su
    • Kim, Woo Jin
  • Publication Date: 2007-6


  • English

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  • Accession Number: 01051699
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 8 2007 4:40PM