ASTM C1231/C1231M-23
(Practice)Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical Concrete Specimens
Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical Concrete Specimens
SIGNIFICANCE AND USE
4.1 This practice provides for using an unbonded capping system in testing hardened concrete cylinders made in accordance with Practices C31/C31M or C192/C192M, or cores obtained in accordance with Test Method C42/C42M in lieu of the capping systems described in Practice C617/C617M.
4.2 The elastomeric pads deform in initial loading to conform to the contour of the ends of the test specimens and are restrained from excessive lateral spreading by plates and metal rings to provide a uniform distribution of load from the bearing blocks of the testing machine to the ends of the concrete or mortar specimens.
SCOPE
1.1 This practice covers requirements for a capping system using unbonded caps for testing concrete cylinders molded in accordance with Practice C31/C31M or C192/C192M, or cores obtained in accordance with Test Method C42/C42M. Unbonded neoprene caps of a defined hardness are permitted to be used for testing for a specified maximum number of reuses without qualification testing up to a certain concrete compressive strength level. Above that strength, level neoprene caps will require qualification testing. Qualification testing is required for all elastomeric materials other than neoprene regardless of the concrete strength.
1.2 Unbonded caps are not to be used for acceptance testing of concrete with compressive strength below 10 MPa [1500 psi ] or above 80 MPa [12 000 psi].
1.3 The text of this standard refers to 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 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. Combining values from the two systems may result in non-conformance with the standard.
1.5 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. (Warning—Concrete specimens tested with unbonded caps rupture more violently than comparable specimens tested with bonded caps. The safety precautions given in the Manual of Aggregate and Concrete Testing are recommended.2)
1.6 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.
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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.
Designation: C1231/C1231M − 23
Standard Practice for
Use of Unbonded Caps in Determination of Compressive
1
Strength of Hardened Cylindrical Concrete Specimens
This standard is issued under the fixed designation C1231/C1231M; 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.
1. Scope* bonded caps. The safety precautions given in the Manual of
2
Aggregate and Concrete Testing are recommended. )
1.1 This practice covers requirements for a capping system
1.6 This international standard was developed in accor-
using unbonded caps for testing concrete cylinders molded in
dance with internationally recognized principles on standard-
accordance with Practice C31/C31M or C192/C192M, or cores
ization established in the Decision on Principles for the
obtained in accordance with Test Method C42/C42M. Un-
Development of International Standards, Guides and Recom-
bonded neoprene caps of a defined hardness are permitted to
mendations issued by the World Trade Organization Technical
be used for testing for a specified maximum number of reuses
Barriers to Trade (TBT) Committee.
without qualification testing up to a certain concrete compres-
sive strength level. Above that strength, level neoprene caps
2. Referenced Documents
will require qualification testing. Qualification testing is re-
3
2.1 ASTM Standards:
quired for all elastomeric materials other than neoprene
C31/C31M Practice for Making and Curing Concrete Test
regardless of the concrete strength.
Specimens in the Field
1.2 Unbonded caps are not to be used for acceptance testing
C39/C39M Test Method for Compressive Strength of Cylin-
of concrete with compressive strength below 10 MPa [1500 psi
drical Concrete Specimens
] or above 80 MPa [12 000 psi].
C42/C42M Test Method for Obtaining and Testing Drilled
1.3 The text of this standard refers to notes and footnotes
Cores and Sawed Beams of Concrete
that provide explanatory material. These notes and footnotes C192/C192M Practice for Making and Curing Concrete Test
(excluding those in tables and figures) shall not be considered
Specimens in the Laboratory
as requirements of the standard. C617/C617M Practice for Capping Cylindrical Concrete
Specimens
1.4 Units—The values stated in either SI units or inch-
D2000 Classification System for Rubber Products in Auto-
pound units are to be regarded separately as standard. The
motive Applications
values stated in each system are not necessarily exact equiva-
lents; therefore, to ensure conformance with the standard, each
3. Terminology
system shall be used independently of the other, and values
3.1 Definitions of Terms Specific to This Standard:
from the two systems shall not be combined. Combining values
3.1.1 pad, n—an unbonded elastomeric pad.
from the two systems may result in non-conformance with the
standard.
3.1.2 unbonded cap, n—a metal retainer and an elastomeric
pad.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Significance and Use
responsibility of the user of this standard to establish appro-
4.1 This practice provides for using an unbonded capping
priate safety, health, and environmental practices and deter-
system in testing hardened concrete cylinders made in accor-
mine the applicability of regulatory limitations prior to use.
dance with Practices C31/C31M or C192/C192M, or cores
(Warning—Concrete specimens tested with unbonded caps
obtained in accordance with Test Method C42/C42M in lieu of
rupture more violently than comparable specimens tested with
the capping systems described in Practice C617/C617M.
1 2
This practice is under the jurisdiction of ASTM Committee C09 on Concrete Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 on Annual Book of ASTM Standards, Vol 04.02.
3
Testing for Strength. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2023. Published October 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1993. Last previous edition approved in 2014 as C1231/C1231M – 23. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C1231_C1231M-23. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, P
...
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: C1231/C1231M − 15 C1231/C1231M − 23
Standard Practice for
Use of Unbonded Caps in Determination of Compressive
1
Strength of Hardened Cylindrical Concrete Specimens
This standard is issued under the fixed designation C1231/C1231M; 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.
1. Scope*
1.1 This practice covers requirements for a capping system using unbonded caps for testing concrete cylinders molded in
accordance with Practice C31/C31M or C192/C192M, or cores obtained in accordance with Test Method C42/C42M. Unbonded
neoprene caps of a defined hardness are permitted to be used for testing for a specified maximum number of reuses without
qualification testing up to a certain concrete compressive strength level. Above that strength, level neoprene caps will require
qualification testing. Qualification testing is required for all elastomeric materials other than neoprene regardless of the concrete
strength.
1.2 Unbonded caps are not to be used for acceptance testing of concrete with compressive strength below 10 MPa [1500 psi ] or
above 80 MPa [12 000 psi].
1.3 The text of this standard refers to 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 Units—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 beare not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall
be used independently of the other. other, and values from the two systems shall not be combined. Combining values from the two
systems may result in non-conformance with the standard.
1.5 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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use. (Warning—Concrete specimens tested with unbonded caps rupture more
violently than comparable specimens tested with bonded caps. The safety precautions given in the Manual of Aggregate and
2
Concrete Testing are recommended. )
1.6 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.
1
This practice 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 Dec. 1, 2015Oct. 1, 2023. Published February 2016October 2023. Originally approved in 1993. Last previous edition approved in 2014 as
C1231/C1231M – 14. DOI: 10.1520/C1231_C1231M-15.23. DOI: 10.1520/C1231_C1231M-23.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
*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 ----------------------
C1231/C1231M − 23
2. Referenced Documents
3
2.1 ASTM Standards:
C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C617C617/C617M Practice for Capping Cylindrical Concrete Specimens
D2000 Classification System for Rubber Products in Automotive Applications
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 pad, n—an unbonded elastomeric pad.
3.1.2 unbonded cap, n—a metal retainer and an elastomeric pad.
4. Significance and Use
4.1 This practice provides for using an unbonded capping system in testing hardened concrete cylinders made in accordance with
Practices C31/C31M or C192/C192M, or cores obtained in
...
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