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ASTM D 6780 Document Information:
Title
Standard Test Method for Water Content and Density of Soil in Place by Time Domain Reflectometry (TDR)
ASTM International
Publication Date:
May 1, 2005
Scope:
(Footnote *)
This test method may be used to determine the water content of soils
and the in-place density of
soils using a TDR apparatus.
This test method applies to soils that have 30 % or less by weight of
their particles retained on
the 19.0-mm (¾-in.) sieve.
This test method is suitable for use as a means of acceptance for
compacted fill or embankments.
This test method may not be suitable for organic and highly plastic
soils.
All observed and calculated values shall conform to the guidelines for
significant digits and
rounding established in Practice D 6026.
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.
Two alternative procedures are provided.
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.
Procedure B involves only an in-place test by incorporating a bulk
electrical conductivity in
addition to the apparent dielectric constant.
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
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.
Footnote * - A Summary of Changes section appears at the end of this
standard.
Keywords:
- compaction test
- construction control
- density
- dielectric constant
- electrical permittivity
- electromagnetic waves
- field control
- field tests
- inspection
- moisture content
- quality control
- soil compaction
- soil density
- time domain reflectometry
- water content
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