This test method covers the determination of strength and
stress-strain relationships of a cylindrical specimen of either an
intact, reconstituted, or remolded saturated cohesive soil.
Specimens are isotropically consolidated and sheared in compression
without drainage at a constant rate of axial deformation (strain
This test method provides for the calculation of total and
effective stresses, and axial compression by measurement of axial
load, axial deformation, and pore-water pressure.
This test method provides data useful in determining strength
and deformation properties of cohesive soils such as Mohr strength
envelopes and Young's modulus. Generally, three specimens are
tested at different effective consolidation stresses to define a
The determination of strength envelopes and the development of
relationships to aid in interpreting and evaluating test results
are beyond the scope of this test method and must be performed by a
qualified, experienced professional.
All observed and calculated values shall conform to the
guidelines for significant digits and rounding established in
The methods used to specify how data are collected, calculated,
or recorded in this standard are regarded as the industry standard.
In addition, they are representative of the significant digits that
generally should be retained. The procedures used do not consider
material variation, purpose for obtaining the data, special purpose
studies or any consideration of end use. It is beyond the scope of
this test method to consider significant digits used in analysis
methods for engineering design.
Units—The values stated in SI units are to be regarded
as standard. The inch-pound units given in parentheses are
mathematical conversions which are provided for information
purposes only and are not considered standard. Reporting of test
results in units other than SI shall not be regarded as
nonconformance with this test method.
The gravitational system of inch-pound units is used when
dealing with inch-pound units. In this system, the pound (lbf)
represents a unit of force (weight), while the unit for mass is
slugs. The slug unit is not given, unless dynamic (F = ma)
calculations are involved.
It is common practice in the engineering/construction profession
to concurrently use pounds to represent both a unit of mass (lbm)
and of force (lbf). This implicitly combines two separate systems
of units; that is, the absolute system and the gravitational
system. It is scientifically undesirable to combine the use of two
separate sets of inch-pound units within a single standard. As
stated, this standard includes the gravitational system of
inch-pound units and does not use/present the slug unit for mass.
However, the use of balances or scales recording pounds of mass
(lbm) or recording density in lbm/ft3 shall not be
regarded as nonconformance with this standard.
The terms density and unit weight are often used
interchangeably. Density is mass per unit volume whereas unit
weight is force per unit volume. In this standard density is given
only in SI units. After the density has been determined, the unit
weight is calculated in SI or inch-pound units, or both.
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.
*A Summary of Changes section appears at the end of this
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