ASTM WK41978

    New Test Method for Measuring a Soil Modulus in the Field and in the Laboratory with a Hand Held Bending Plate

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    Developed by Subcommittee: D18.08 | Committee D18 | Contact Staff Manager


    1. Scope

    1. Scope 1.1 This method covers the determination of a modulus of deformation of soil and soil-aggregate mixtures by means of a hand held bending plate test. The test device and associated procedures give a modulus of the soil in the field (test method A) and in the laboratory (test method B). 1.2 The principal of this test is to use the bending of a flexible plate, loaded at its center while resting on the tested soil, as an indicator of the modulus of the soil. A low modulus may indicate soft unacceptable soils where higher moduli may indicate adequate soil conditions and appropriate degree of compaction. If the soil is stiff, the bending magnitude will be small. If the soil is soft, this magnitude will be more important as the center of the plate will penetrate deeper into the soil. If the soil is very soft, the entire plate simply punches through the soil. Within the range of soil stiffness, where the plate bending is proportional to the soil modulus, the bending strain, measured with strain gauges glued to the top of the plate, is used to obtain the modulus. This test can be done on ground surface or on the sample surface in a Proctor mold. 1.3 The modulus, in force per unit area, is determined by applying a small vertical force of 223 N at the center of the 150 mm diameter bending plate resting on the ground surface, or on top of a 1502 mm diameter sample in the Proctor mold, measuring the resulting bending strain in the plate, and calculating the modulus. 1.4 Another method for determining a low strain high frequency modulus is described in test method D6758. 1.5 This test may require the measurement of in-place moisture contents according to test methods D2216, D4643 and D4959 (see Section 7). 1.46 This test method is applicable to both fine-grained and coarse-grained soils as defined by the Unified Soil Classification System (USCS) or by Classification D2487. The laboratory test specimens are reconstituted by compaction using standard effort (D698) or modified effort (D1557) in a 1502 mm diameter Proctor mold and consisting of minus 19 mm particle size. Field tests can be performed on coarser soils with limitations stated in Section 6 . 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. 1.8 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.5 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.

    New Test Device for Soil Compaction Testing and Modulus determination of soil


    soil compaction; water content; soil modulus; bending plate modulus; non-destructive test.

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Louis Marcil

    Draft Under Development