ASTM C1231/C1231M-15
(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.
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 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.
1.4 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 and health 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)
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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 − 15
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* 2. Referenced Documents
3
1.1 This practice covers requirements for a capping system 2.1 ASTM Standards:
using unbonded caps for testing concrete cylinders molded in C31/C31MPractice for Making and Curing Concrete Test
accordancewithPracticeC31/C31MorC192/C192M,orcores Specimens in the Field
obtained in accordance with Test MethodC42/C42M. Un- C39/C39MTest Method for Compressive Strength of Cylin-
bonded neoprene caps of a defined hardness are permitted to drical Concrete Specimens
be used for testing for a specified maximum number of reuses C42/C42MTest Method for Obtaining and Testing Drilled
without qualification testing up to a certain concrete compres- Cores and Sawed Beams of Concrete
sive strength level. Above that strength, level neoprene caps C192/C192MPractice for Making and Curing ConcreteTest
will require qualification testing. Qualification testing is re- Specimens in the Laboratory
quired for all elastomeric materials other than neoprene C617Practice for Capping Cylindrical Concrete Specimens
regardless of the concrete strength. D2000Classification System for Rubber Products in Auto-
motive Applications
1.2 Unbondedcapsarenottobeusedforacceptancetesting
ofconcretewithcompressivestrengthbelow10MPa[1500psi
3. Terminology
] or above 80 MPa [12 000 psi].
3.1 Definitions of Terms Specific to This Standard:
1.3 The values stated in either SI units or inch-pound units
3.1.1 pad, n—an unbonded elastomeric pad.
are to be regarded separately as standard. The values stated in
3.1.2 unbonded cap, n—a metal retainer and an elastomeric
each system may not be exact equivalents; therefore, each
pad.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
4. Significance and Use
with the standard.
4.1 This practice provides for using an unbonded capping
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the system in testing hardened concrete cylinders made in accor-
dance with Practices C31/C31M or C192/C192M, or cores
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- obtained in accordance withTest Method C42/C42M in lieu of
the capping systems described in Practice C617.
bility of regulatory limitations prior to use. (Warning—
Concrete specimens tested with unbonded caps rupture more
4.2 The elastomeric pads deform in initial loading to con-
violently than comparable specimens tested with bonded caps.
form to the contour of the ends of the test specimens and are
The safety precautions given in the Manual of Aggregate and
restrained from excessive lateral spreading by plates and metal
2
Concrete Testing are recommended. )
ringstoprovideauniformdistributionofloadfromthebearing
blocks of the testing machine to the ends of the concrete or
1
mortar specimens.
This practice is under the jurisdiction of ASTM Committee C09 on Concrete
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.61on
Testing for Strength.
Current edition approved Dec. 1, 2015. Published February 2016. Originally
3
approved in 1993. Last previous edition approved in 2014 as C1231/C1231M – 14. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/C1231_C1231M-15. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Standards volume information, refer to the standard’s Document Summary page on
Annual Book of ASTM Standards, Vol 04.02. 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 ----------------------
C1231/C1231M − 15
5. Materials and Apparatus baseplate shall be at least 12 mm [0.47 in.]. The surface of the
baseplatethatcontactsthebearingblockofthetestingmachine
5.1 Materials and equipment necessary to produce ends of
shall be plane to within 0.05 mm [0.002 in.]. The bearing
the referen
...
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 − 14 C1231/C1231M − 15
Standard Practice for
Use of Unbonded Caps in Determination of Compressive
Strength of Hardened Cylindrical Concrete
1
CylindersSpecimens
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 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.
1.4 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 and health practices and determine the applicability of regulatory
limitations prior to use. (Warning—Concrete cylindersspecimens tested with unbonded caps rupture more violently than
comparable cylindersspecimens tested with bonded caps. The safety precautions given in the Manual of Aggregate and Concrete
2
Testing are recommended. )
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
C617 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.
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 July 1, 2014Dec. 1, 2015. Published July 2014February 2016. Originally approved in 1993. Last previous edition approved in 20132014 as
C1231/C1231M – 13.14. DOI: 10.1520/C1231_C1231M-14.10.1520/C1231_C1231M-15.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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 ----------------------
C1231/C1231M − 15
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 in , or cores obtained in accordance with Test Method C42/C42M in lieu of the capping
systems described in Practice C617.
4.2 The elastomeric pads deform in initial loading to conform to the contour of the ends of the cylinder 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 cylinders.specime
...
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: C1231/C1231M − 15
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* 2. Referenced Documents
3
1.1 This practice covers requirements for a capping system 2.1 ASTM Standards:
using unbonded caps for testing concrete cylinders molded in C31/C31M Practice for Making and Curing Concrete Test
accordance with Practice C31/C31M or C192/C192M, or cores Specimens in the Field
obtained in accordance with Test Method C42/C42M. Un- C39/C39M Test Method for Compressive Strength of Cylin-
bonded neoprene caps of a defined hardness are permitted to drical Concrete Specimens
be used for testing for a specified maximum number of reuses C42/C42M Test Method for Obtaining and Testing Drilled
without qualification testing up to a certain concrete compres- Cores and Sawed Beams of Concrete
sive strength level. Above that strength, level neoprene caps C192/C192M Practice for Making and Curing Concrete Test
will require qualification testing. Qualification testing is re- Specimens in the Laboratory
quired for all elastomeric materials other than neoprene C617 Practice for Capping Cylindrical Concrete Specimens
regardless of the concrete strength. D2000 Classification System for Rubber Products in Auto-
motive Applications
1.2 Unbonded caps are not to be used for acceptance testing
of concrete with compressive strength below 10 MPa [1500 psi
3. Terminology
] or above 80 MPa [12 000 psi].
3.1 Definitions of Terms Specific to This Standard:
1.3 The values stated in either SI units or inch-pound units
3.1.1 pad, n—an unbonded elastomeric pad.
are to be regarded separately as standard. The values stated in
3.1.2 unbonded cap, n—a metal retainer and an elastomeric
each system may not be exact equivalents; therefore, each
pad.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
4. Significance and Use
with the standard.
1.4 This standard does not purport to address all of the 4.1 This practice provides for using an unbonded capping
system in testing hardened concrete cylinders made in accor-
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- dance with Practices C31/C31M or C192/C192M, or cores
obtained in accordance with Test Method C42/C42M in lieu of
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. (Warning— the capping systems described in Practice C617.
Concrete specimens tested with unbonded caps rupture more
4.2 The elastomeric pads deform in initial loading to con-
violently than comparable specimens tested with bonded caps.
form to the contour of the ends of the test specimens and are
The safety precautions given in the Manual of Aggregate and
restrained from excessive lateral spreading by plates and metal
2
Concrete Testing are recommended. )
rings to provide a uniform distribution of load from the bearing
blocks of the testing machine to the ends of the concrete or
1
mortar specimens.
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, 2015. Published February 2016. Originally
3
approved in 1993. Last previous edition approved in 2014 as C1231/C1231M – 14. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/C1231_C1231M-15. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Standards volume information, refer to the standard’s Document Summary page on
Annual Book of ASTM Standards, Vol 04.02. 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 ----------------------
C1231/C1231M − 15
5. Materials and Apparatus baseplate shall be at least 12 mm [0.47 in.]. The surface of the
baseplate that contacts the bearing block of the testing machine
5.1 Materials and equipment necessary to produce ends of
shall be plane to within 0.05 mm [0.002 in.]. The bearing
the reference specimens that conform to planeness require-
surfaces of the retainers shall not
...
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