Implementation of the soil compactor analyzer into test method TEX-113-E : technical report.
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Implementation of the soil compactor analyzer into test method TEX-113-E : technical report.

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  • Creators:
  • Corporate Creators:
    Texas Transportation Institute
  • Corporate Contributors:
    Texas. Dept. of Transportation. Research and Technology Implementation Office
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Texas
  • Edition:
    Technical report; Sept. 2008-Aug. 2010.
  • Corporate Publisher:
    Texas Transportation Institute
  • Abstract:
    Test method Tex-113-E prepares laboratory aggregate base test specimens with an impact hammer

    compactor. These specimens are used for compaction characteristics and design tests. Although the

    historical Tex-113-E required a certain amount of compaction energy, no method to validate attainment of

    that energy existed until Texas Department of Transportation (TxDOT) Project 0-5135 developed the Soil

    Compactor Analyzer (SCA). The SCA measures the kinetic energy applied by each drop of the impact

    hammer. In this project, the SCA system was modified to control the compactor, where the SCA starts the

    machine and then turns off the compactor when the prescribed amount of energy is attained. This project

    then evaluated how changing the machine operational parameters, such as hammer weight, drop height, and

    number of blows per lift, impacted test results. In this evaluation, the SCA was used in all cases to control

    the compactor, so the prescribed amount of total energy was always applied regardless of machine

    operational parameters. The results showed that while using the current TxDOT-approved SCA to control

    total energy per lift between 740 and 765 ft-lbf, the number of blows per lift may vary between 45 and 60

    with no impact on test results. Finally, this project conducted an interlaboratory study to develop precision

    statistics of Tex-113-E compaction. This study showed that the SCA enables excellent precision of total

    compaction energy. Total compaction energy should be repeatable and reproducible within about 27 ft-lbf,

    or approximately 1 percent of the specification value. Compacted dry density should be repeatable within

    about 2.5 pounds per cubic foot (pcf) and reproducible within about 3.3 pcf.

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