ASTM C39/C39M-05e1
(Test Method)Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
SIGNIFICANCE AND USE
Care must be exercised in the interpretation of the significance of compressive strength determinations by this test method since strength is not a fundamental or intrinsic property of concrete made from given materials. Values obtained will depend on the size and shape of the specimen, batching, mixing procedures, the methods of sampling, molding, and fabrication and the age, temperature, and moisture conditions during curing.
This test method is used to determine compressive strength of cylindrical specimens prepared and cured in accordance with Practices C 31/C 31M, C 192/C 192M, C 617, and C 1231/C 1231M and Test Methods C 42/C 42M and C 873.
The results of this test method are used as a basis for quality control of concrete proportioning, mixing, and placing operations; determination of compliance with specifications; control for evaluating effectiveness of admixtures; and similar uses.
The individual who tests concrete cylinders for acceptance testing shall meet the concrete laboratory technician requirements of Practice C 1077, including an examination requiring performance demonstration that is evaluated by an independent examiner.
Note 1—Certification equivalent to the minimum guidelines for ACI Concrete Laboratory Technician, Level I or ACI Concrete Strength Testing Technician will satisfy this requirement.
SCOPE
1.1 This test method covers determination of compressive strength of cylindrical concrete specimens such as molded cylinders and drilled cores. It is limited to concrete having a unit weight in excess of 50 lb/ft 3 [800 kg/m3].
1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. The SI units are shown in brackets. 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 nonconformance with the standard.
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. (Warning-Means should be provided to contain concrete fragments during sudden rupture of specimens. Tendency for sudden rupture increases with increasing concrete strength and it is more likely when the testing machine is relatively flexible. The safety precautions given in the Manual of Aggregate and Concrete Testing are recommended.)
1.3 The text of this standard references notes which provide explanatory material. These notes shall not be considered as requirements of the standard.
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Designation:C39/C39M–05
Standard Test Method for
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Compressive Strength of Cylindrical Concrete Specimens
This standard is issued under the fixed designation C 39/C 39M; 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.
This standard has been approved for use by agencies of the Department of Defense.
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e NOTE—Note 1 was corrected editorially in September 2006.
1. Scope C 31/C 31M Practice for Making and Curing Concrete Test
Specimens in the Field
1.1 This test method covers determination of compressive
C 42/C 42M Test Method for Obtaining and Testing Drilled
strength of cylindrical concrete specimens such as molded
Cores and Sawed Beams of Concrete
cylinders and drilled cores. It is limited to concrete having a
3 3
C 192/C 192M Practice for Making and Curing Concrete
unit weight in excess of 50 lb/ft [800 kg/m ].
Test Specimens in the Laboratory
1.2 The values stated in either inch-pound or SI units are to
C 617 Practice for Capping Cylindrical Concrete Speci-
be regarded separately as standard. The SI units are shown in
mens
brackets. The values stated in each system may not be exact
C 670 Practice for Preparing Precision and Bias Statements
equivalents;therefore,eachsystemshallbeusedindependently
for Test Methods for Construction Materials
of the other. Combining values from the two systems may
C 873 Test Method for Compressive Strength of Concrete
result in nonconformance with the standard.
Cylinders Cast in Place in Cylindrical Molds
1.3 This standard does not purport to address all of the
C 1077 PracticeforLaboratoriesTestingConcreteandCon-
safety concerns, if any, associated with its use. It is the
crete Aggregates for Use in Construction and Criteria for
responsibility of the user of this standard to establish appro-
Laboratory Evaluation
priate safety and health practices and determine the applica-
C 1231/C 1231M Practice for Use of Unbonded Caps in
bility of regulatory limitations prior to use. (Warning—Means
Determination of Compressive Strength of Hardened Con-
should be provided to contain concrete fragments during
crete Cylinders
sudden rupture of specimens. Tendency for sudden rupture
E4 Practices for Force Verification of Testing Machines
increaseswithincreasingconcretestrengthanditismorelikely
E74 Practice of Calibration of Force-Measuring Instru-
when the testing machine is relatively flexible. The safety
ments for Verifying the Force Indication of Testing Ma-
precautions given in the Manual of Aggregate and Concrete
chines
Testing are recommended.)
Manual of Aggregate and Concrete Testing
1.4 The text of this standard references notes which provide
explanatory material. These notes shall not be considered as
3. Summary of Test Method
requirements of the standard.
3.1 This test method consists of applying a compressive
2. Referenced Documents axialloadtomoldedcylindersorcoresataratewhichiswithin
2 a prescribed range until failure occurs. The compressive
2.1 ASTM Standards:
strength of the specimen is calculated by dividing the maxi-
mum load attained during the test by the cross-sectional area of
the specimen.
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This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
4. Significance and Use
C09.61 on Testing Concrete for Strength.
4.1 Care must be exercised in the interpretation of the
Current edition approved Nov. 1, 2005. Published November 2005. Originally
approved in 1921. Last previous edition approved in 2004 as C 39/C 39M – 04a.
significanceofcompressivestrengthdeterminationsbythistest
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
methodsincestrengthisnotafundamentalorintrinsicproperty
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
of concrete made from given materials. Values obtained will
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. dependonthesizeandshapeofthespecimen,batching,mixing
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C39/C39M–05
procedures, the methods of sampling, molding, and fabrication 5.1.3.1 The percentage of error for the loads within the
and the age, temperature, and moisture conditions during proposed range of use of the testing machine shall not exceed
curing. 61.0 % of the indicated load.
4.2 This test method is used to determine compressive 5.1.3.2 The accuracy of the testing machine shall be verified
strength of cylindrica
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