ASTM D6780-05

    Standard Test Method for Water Content and Density of Soil in Place by Time Domain Reflectometry (TDR)

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    1. Scope

    1.1 This test method may be used to determine the water content of soils and the in-place density of soils using a TDR apparatus.

    1.2 This test method applies to soils that have 30 % or less by weight of their particles retained on the 19.0-mm ( 3/4-in.) sieve.

    1.3 This test method is suitable for use as a means of acceptance for compacted fill or embankments.

    1.4 This test method may not be suitable for organic and highly plastic soils.

    1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026.

    1.5.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope.

    1.6 Two alternative procedures are provided.

    1.6.1 Procedure A involves two tests in the field, an in-place test and a test in a mold containing material excavated from the in-place test location. The apparent dielectric constant is determined in both tests.

    1.6.2 Procedure B involves only an in-place test by incorporating a bulk electrical conductivity in addition to the apparent dielectric constant.

    1.7 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. For additional information consult ASTM SI 10

    1,8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D653 Terminology Relating to Soil, Rock, and Contained Fluids

    D698 Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft3 (600 kN-m/m3))

    D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass

    D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

    D4753 Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction Materials Testing

    D6026 Practice for Using Significant Digits in Geotechnical Data

    D6565 Test Method for Determination of Water (Moisture) Content of Soil by the Time-Domain Reflectometry (TDR) Method

    E1 Specification for ASTM Liquid-in-Glass Thermometers

    SI10 Standard for Use of the International System of Units (SI): The Modern Metric System

    ICS Code

    ICS Number Code 13.080.20 (Physical properties of soil)

    UNSPSC Code

    UNSPSC Code 11111501(Soil)

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    DOI: 10.1520/D6780-05

    Citation Format

    ASTM D6780-05, Standard Test Method for Water Content and Density of Soil in Place by Time Domain Reflectometry (TDR), ASTM International, West Conshohocken, PA, 2005,

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