ASTM D2166-00e1
(Test Method)Standard Test Method for Unconfined Compressive Strength of Cohesive Soil
Standard Test Method for Unconfined Compressive Strength of Cohesive Soil
SCOPE
1.1 This test method covers the determination of the unconfined compressive strength of cohesive soil in the undisturbed, remolded, or compacted condition, using strain-controlled application of the axial load.
1.2 This test method provides an approximate value of the strength of cohesive soils in terms of total stresses.
1.3 This test method is applicable only to cohesive materials which will not expel or bleed water (water expelled from the soil due to deformation or compaction) during the loading portion of the test and which will retain intrinsic strength after removal of confining pressures, such as clays or cemented soils. Dry and crumbly soils, fissured or varved materials, silts, peats, and sands cannot be tested with this method to obtain valid unconfined compression strength values.
Note 1--The determination of the unconsolidated, undrained strength of cohesive soils with lateral confinement is covered by Test Method D 2850.
1.4 This test method is not a substitute for Test Method D2850.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.5.1 The procedures used to specify how data are collected/recorded and calculated in this test method are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to commensurate with these considerations. It is beyond the scope of this test method to consider significant digits used in analysis methods for engineering design.
1.6 The values stated in SI units are to be regarded as the standard. The values stated in inch-pound units are approximate.
1.7 This standard does not purport to address all of the safety problems, 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.
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Designation: D 2166 – 00
Standard Test Method for
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Unconfined Compressive Strength of Cohesive Soil
This standard is issued under the fixed designation D 2166; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Section 8.2 was corrected editorially in January 2005.
1. Scope* 1.6 The values stated in SI units are to be regarded as the
standard. The values stated in inch-pound units are approxi-
1.1 This test method covers the determination of the uncon-
mate.
fined compressive strength of cohesive soil in the undisturbed,
1.7 This standard does not purport to address all of the
remolded, or compacted condition, using strain-controlled
safety problems, if any, associated with its use. It is the
application of the axial load.
responsibility of the user of this standard to establish appro-
1.2 This test method provides an approximate value of the
priate safety and health practices and determine the applica-
strength of cohesive soils in terms of total stresses.
bility of regulatory limitations prior to use.
1.3 Thistestmethodisapplicableonlytocohesivematerials
which will not expel or bleed water (water expelled from the
2. Referenced Documents
soil due to deformation or compaction) during the loading
2.1 ASTM Standards:
portion of the test and which will retain intrinsic strength after
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D 422 Test Method for Particle-Size Analysis of Soils
removal of confining pressures, such as clays or cemented
D 653 Terminology Relating to Soil, Rock, and Contained
soils. Dry and crumbly soils, fissured or varved materials, silts,
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Fluids
peats, and sands cannot be tested with this method to obtain
D 854 Test Method for Specific Gravity of Soil Solids by
valid unconfined compression strength values.
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Water Pycnometer
NOTE 1—The determination of the unconsolidated, undrained strength
D 1587 Practice for Thin-Walled Tube Sampling of Soils
of cohesive soils with lateral confinement is covered by Test Method
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for Geotechnical Purposes
D 2850.
D 2216 TestMethodforLaboratoryDeterminationofWater
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1.4 This test method is not a substitute for Test Method
(Moisture) Content of Soil and Rock by Mass
D 2850.
D 2487 Practice for Classification of Soils for Engineering
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1.5 All observed and calculated values shall conform to the
Purposes (Unified Soil Classification System)
guidelines for significant digits and rounding established in
D 2488 Practice for Description and Identification of Soils
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Practice D 6026.
(Visual-Manual Procedure)
1.5.1 Theproceduresusedtospecifyhowdataarecollected/
D 2850 Test Method for Unconsolidated, Undrained Com-
recorded and calculated in this test method are regarded as the
pressive Strength of Cohesive Soils in Triaxial Compres-
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industry standard. In addition, they are representative of the
sion
significant digits that should generally be retained. The proce-
D 3740 Practice for Minimum Requirements for Agencies
dures used do not consider material variation, purpose for
Engaged in the Testing and/or Inspection of Soil and Rock
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obtaining the data, special purpose studies, or any consider-
as Used in Engineering Design Construction
ations for the user’s objectives; and it is common practice to
D 4220 Practices for Preserving and Transporting Soil
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increase or reduce significant digits of reported data to com-
Samples
mensurate with these considerations. It is beyond the scope of
D 4318 Test Method for Liquid Limit, Plastic Limit, and
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this test method to consider significant digits used in analysis
Plasticity Index of Soils
methods for engineering design.
D 6026 Practice for Using Significant Digits in Geotechni-
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cal Data
E 177 Practice for Use of the Terms Precision and Bias in
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ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.05 on Structural
Properties of Soils.
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Current edition approved June 10, 2000. Published September 2000. Originally Annual Book of ASTM Standards, Vol 04.08.
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published as D 2166 – 63T. Last previous edition D 2166 – 98a. Annual Book of ASTM Standards, Vol 04.09.
*A Summary of Changes section appears at the end of this standard.
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D 2166 – 00
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ASTM Test Methods the compressive stress to within 1 kPa (0.01 ton/ft ). For soil
E 691 Practice for Conducting an Interlaboratory Study to with an unconfined compressive strength of 100 kPa (1.0
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Determine the Precision of a Test Method ton/ft ) or greater, the compression
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