ASTM C42/C42M-18a

Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

SIGNIFICANCE AND USE
3.1 This test method provides standardized procedures for obtaining and testing specimens to determine the compressive, splitting tensile, and flexural strength of in-place concrete.  
3.2 Generally, test specimens are obtained when doubt exists about the in-place concrete quality due either to low strength test results during construction or signs of distress in the structure. Another use of this method is to provide strength information on older structures.  
3.3 Concrete strength is affected by the location of the concrete in a structural element, with the concrete at the bottom tending to be stronger than the concrete at the top. Core strength is also affected by core orientation relative to the horizontal plane of the concrete as placed, with strength tending to be lower when measured parallel to the horizontal plane.3 These factors shall be considered in planning the locations for obtaining concrete samples and in comparing strength test results.  
3.4 The strength of concrete measured by tests of cores is affected by the amount and distribution of moisture in the specimen at the time of test. There is no standard procedure to condition a specimen that will ensure that, at the time of test, it will be in the identical moisture condition as concrete in the structure. The moisture conditioning procedures in this test method are intended to provide reproducible moisture conditions that minimize within-laboratory and between-laboratory variations and to reduce the effects of moisture introduced during specimen preparation.  
3.5 The measured compressive strength of a core will generally be less than that of a corresponding properly molded and cured standard cylinder tested at the same age. For a given concrete, however, there is no unique relationship between the strengths of these two types of specimens (see Note 3). The relationship is affected by many factors such as the strength level of the concrete, the in-place temperature and moisture histories, the de...
SCOPE
1.1 This test method covers obtaining, preparing, and testing cores drilled from concrete for length or compressive strength or splitting tensile strength determinations. This test method is not applicable to cores from shotcrete.
Note 1: Test Method C1604/C1604M is applicable for obtaining, preparing, and testing cores from shotcrete.
Note 2: Appendix X1 provides recommendations for obtaining and testing sawed beams for flexural performance.  
1.2 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.  
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 14-Dec-2018
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.61 - Testing for Strength

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C42/C42M − 18a American Association State
Highway and Transportation Officials Standard
AASHTO No.: T24
Standard Test Method for
Obtaining and Testing Drilled Cores and Sawed Beams of
1
Concrete
This standard is issued under the fixed designation C42/C42M; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers obtaining, preparing, and test-
C39/C39M Test Method for Compressive Strength of Cylin-
ing cores drilled from concrete for length or compressive
drical Concrete Specimens
strength or splitting tensile strength determinations. This test
C78/C78M Test Method for Flexural Strength of Concrete
method is not applicable to cores from shotcrete.
(Using Simple Beam with Third-Point Loading)
NOTE 1—Test Method C1604/C1604M is applicable for obtaining,
C174/C174M Test Method for MeasuringThickness of Con-
preparing, and testing cores from shotcrete.
crete Elements Using Drilled Concrete Cores
NOTE 2—Appendix X1 provides recommendations for obtaining and
C496/C496M Test Method for Splitting Tensile Strength of
testing sawed beams for flexural performance.
Cylindrical Concrete Specimens
1.2 The values stated in either SI units or inch-pound units
C617/C617M Practice for Capping Cylindrical Concrete
are to be regarded separately as standard. The values stated in
Specimens
each system may not be exact equivalents; therefore, each
C642 Test Method for Density, Absorption, and Voids in
system shall be used independently of the other. Combining
Hardened Concrete
values from the two systems may result in non-conformance
C670 Practice for Preparing Precision and Bias Statements
with the standard.
for Test Methods for Construction Materials
C823/C823M Practice for Examination and Sampling of
1.3 The text of this standard references notes and footnotes
Hardened Concrete in Constructions
that provide explanatory material. These notes and footnotes
C1231/C1231M Practice for Use of Unbonded Caps in
(excluding those in tables and figures) shall not be considered
Determination of Compressive Strength of Hardened Cy-
as requirements of the standard.
lindrical Concrete Specimens
C1542/C1542M Test Method for Measuring Length of Con-
1.4 This standard does not purport to address all of the
crete Cores
safety concerns, if any, associated with its use. It is the
C1604/C1604M Test Method for Obtaining and Testing
responsibility of the user of this standard to establish appro-
Drilled Cores of Shotcrete
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3. Significance and Use
1.5 This international standard was developed in accor-
3.1 This test method provides standardized procedures for
dance with internationally recognized principles on standard-
obtaining and testing specimens to determine the compressive,
ization established in the Decision on Principles for the
splitting tensile, and flexural strength of in-place concrete.
Development of International Standards, Guides and Recom-
3.2 Generally, test specimens are obtained when doubt
mendations issued by the World Trade Organization Technical
exists about the in-place concrete quality due either to low
Barriers to Trade (TBT) Committee.
strength test results during construction or signs of distress in
the structure.Another use of this method is to provide strength
information on older structures.
1
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
2
C09.61 on Testing for Strength. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 15, 2018. Published February 2019. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1921. Last previous edition approved in 2018 as C42/C42M – 18. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0042_C0042M-18A. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C42/C42M − 18a
3.3 Concrete strength is affected by the location of the the core as tested and this must be considered in preparing core
concreteinastructuralelement,withtheconcreteatthebottom speci
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C42/C42M − 18 C42/C42M − 18a American Association State
Highway and Transportation Officials Standard
AASHTO No.: T24
Standard Test Method for
Obtaining and Testing Drilled Cores and Sawed Beams of
1
Concrete
This standard is issued under the fixed designation C42/C42M; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers obtaining, preparing, and testing cores drilled from concrete for length or compressive strength or
splitting tensile strength determinations. This test method is not applicable to cores from shotcrete.
NOTE 1—Test Method C1604/C1604M is applicable for obtaining, preparing, and testing cores from shotcrete.
NOTE 2—Appendix X1 provides recommendations for obtaining and testing sawed beams for flexural performance.
1.2 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.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C78/C78M Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
C174/C174M Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
C496/C496M Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens
C617/C617M Practice for Capping Cylindrical Concrete Specimens
C642 Test Method for Density, Absorption, and Voids in Hardened Concrete
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C823/C823M Practice for Examination and Sampling of Hardened Concrete in Constructions
C1231/C1231M Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical
Concrete Specimens
C1542/C1542M Test Method for Measuring Length of Concrete Cores
C1604/C1604M Test Method for Obtaining and Testing Drilled Cores of Shotcrete
3. Significance and Use
3.1 This test method provides standardized procedures for obtaining and testing specimens to determine the compressive,
splitting tensile, and flexural strength of in-place concrete.
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 on
Testing for Strength.
Current edition approved March 15, 2018Dec. 15, 2018. Published April 2018February 2019. Originally approved in 1921. Last previous edition approved in 20162018
as C42/C42M – 16.18. DOI: 10.1520/C0042_C0042M-18.10.1520/C0042_C0042M-18A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C42/C42M − 18a
3.2 Generally, test specimens are obtained when doubt exists about the in-place concrete quality due either to low strength test
re
...