ASTM D 6758 Standard Test Method for Measuring Stiffness and Apparent Modulus of Soil and Soil-Aggregate In-Place by an Electro-Mechanical Method
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ASTM D 6758 Document Information:
Title
Standard Test Method for Measuring Stiffness and Apparent Modulus of Soil and Soil-Aggregate In-Place by an Electro-Mechanical Method
ASTM International
Publication Date:
Jan 1, 2008
Scope:
This test method covers the measurement by electro-mechanical
means of the in-place stiffness of soil or soil-aggregate mixtures
so as to determine a Young's modulus based on certain assumptions.
The apparatus and procedure provide a fairly rapid means of testing
so as to minimize interference and delay of construction. The test
procedure is intended for evaluating the stiffness or modulus of
materials used in earthworks and roadworks. Rapid in-place
stiffness testing supports U.S. federal and state efforts to
specify the in-place performance of construction materials based on
modulus. Results obtained from this method are applicable to the
evaluation of granular cohesionless materials. They are also
applicable to the evaluation of silty and clayey materials with
more than 20 % fines that are not subject to a change in moisture
content. If the silty and clayey material experiences a change in
moisture content, then moisture content shall be taken into account
if the results of this method are to be applicable. The stiffness
measured with this method is influenced by boundary conditions,
specifically the support offered by underlying layers as well as
the thickness and modulus of the layer being tested. Since this
method approximates the layer(s) being evaluated as a half-space,
then the modulus measured is also approximate.
The stiffness, in force per unit displacement, is determined by
imparting a small measured force to the surface of the ground,
measuring the resulting surface velocity and calculating the
stiffness. This is done over a frequency range and the results are
averaged.
The values stated in SI units are to be regarded as the
standard. The inch-pound units equivalents may be approximate.
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.
NOTE 1—Notwithstanding the statements on precision and bias
contained in this test method; the precision of this test method is
dependent on the competence of the personnel performing it, and the
suitability of the equipment and facilities used. Agencies that
meet the criteria of Practice D 3740 are generally considered
capable of competent and objective testing. Users of this test
method are cautioned that compliance with Practice D 3740 does not
in itself assure reliable testing. Reliable testing depends on many
factors; Practice D 3740 provides a means of evaluating some of
those factors.
Keywords:
- compaction control
- in-place modulus
- in-place stiffness
- in-situ test
- non-destructive
- production testing
- shear modulus
- soil stiffness test
- stiffness gauge
- Young's modulus
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