COUPLED MEASUREMENTS OF WATER CONTENT AND ELECTRICAL CONDUCTIVITY IN DIELECTRICALLY LOSSY CLAY SLURRY USING A COATED TDR PROBE

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Author(s)

Abstract

Although time domain reflectometry (TDR) has been widely accepted as a non-destructive in-situ method with high reliability, the effective use of TDR for water content (<i>w</i>) and electrical conductivity (EC) measurements in clay slurry has not been established. We developed a Teflon-coated (TC) probe with a 0.05-mm thick fluorocarbon resin coating, and conducted a calibration experiment for kaolinite slurry to indicate its applicability to the measurements. The TC probe could estimate <i>w</i> from the observed effective dielectric constant (ε<sub>eff</sub>) in the range of <i>w≥</i>47% with a ±6% error range. The ε<sub>eff</sub> includes dielectric constant of two components: material under test (ε<sub>m</sub>) and coating material (ε<sub>tef</sub>). The relationship between ε<sub>eff</sub> and <i>w</i> for this particular probe design cannot be directly applied to other coated probes because each probe has its own specific dielectric characteristic. We defined a function expressing the characteristic, that is ε<sub>eff</sub> vs. ε<sub>m</sub>, according to the testing in various fluid media. By applying the function, the observed data sets of ε<sub>eff</sub> were transformed for a soil specific value (ε<sub>m</sub>). Owing to the sufficient agreement of the ε<sub>m</sub> values with those for the uncoated probe, we obtained the data sets of ε<sub>m</sub> vs. <i>w</i> and its empirical expression for kaolinite slurry.<br>

Journal

  • SOILS AND FOUNDATIONS

    SOILS AND FOUNDATIONS 49(2), 175-180, 2009

    The Japanese Geotechnical Society

Cited by:  2

Codes

  • NII Article ID (NAID)
    110007327457
  • NII NACSIS-CAT ID (NCID)
    AA00700879
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    0038-0806
  • Data Source
    CJPref  NII-ELS  J-STAGE  NDL-Digital 
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