ASTM C1231/C1231M-10

Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders

SIGNIFICANCE AND USE
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 lieu of the capping systems described in Practice C617.
The elastomeric pads deform in initial loading to conform to the contour of the ends of the cylinder 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.
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. 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 1500 psi [10 MPa] or above 12 000 psi [85 MPa].
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 cylinders tested with unbonded caps rupture more violently than comparable cylinders tested with bonded caps. The safety precautions given in the Manual of Aggregate and Concrete Testing are recommended. )

General Information

• Status: Historical
• Publication Date: 31-Jan-2010
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.61 - Testing for Strength

Relations

• Replaced By: ASTM C1231/C1231M-10a - Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders
• Effective Date: 01-Oct-2010

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:C1231/C1231M–10
Standard Practice for
Use of Unbonded Caps in Determination of Compressive
1
Strength of Hardened Concrete Cylinders
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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope* C31/C31M Practice for Making and Curing Concrete Test
Specimens in the Field
1.1 This practice covers requirements for a capping system
C39/C39M Test Method for Compressive Strength of Cy-
using unbonded caps for testing concrete cylinders molded in
lindrical Concrete Specimens
accordance with Practice C31/C31M or C192/C192M. Un-
C192/C192M Practice for Making and Curing Concrete
bonded neoprene caps of a defined hardness are permitted to
Test Specimens in the Laboratory
be used for testing for a specified maximum number of reuses
C617 Practice for Capping Cylindrical Concrete Specimens
without qualification testing up to a certain concrete compres-
D2000 Classification System for Rubber Products in Auto-
sive strength level. Above that strength, level neoprene caps
motive Applications
will require qualification testing. Qualification testing is re-
quired for all elastomeric materials other than neoprene
3. Terminology
regardless of the concrete strength.
3.1 Definitions of Terms Specific to This Standard:
1.2 Unbondedcapsarenottobeusedforacceptancetesting
3.1.1 pad, n—an unbonded elastomeric pad.
of concrete with compressive strength below 1500 psi [10
3.1.2 unbonded cap, n—a metal retainer and an elastomeric
MPa] or above 12 000 psi [85 MPa].
pad.
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
4. Significance and Use
each system may not be exact equivalents; therefore, each
4.1 This practice provides for using an unbonded capping
system shall be used independently of the other. Combining
system in testing hardened concrete cylinders made in accor-
values from the two systems may result in non-conformance
dance with Practices C31/C31M or C192/C192M in lieu of the
with the standard.
capping systems described in Practice C617.
1.4 This standard does not purport to address all of the
4.2 The elastomeric pads deform in initial loading to con-
safety concerns, if any, associated with its use. It is the
form to the contour of the ends of the cylinder and are
responsibility of the user of this standard to establish appro-
restrained from excessive lateral spreading by plates and metal
priate safety and health practices and determine the applica-
ringstoprovideauniformdistributionofloadfromthebearing
bility of regulatory limitations prior to use. (Warning—
blocks of the testing machine to the ends of the concrete or
Concrete cylinders tested with unbonded caps rupture more
mortar cylinders.
violently than comparable cylinders tested with bonded caps.
The safety precautions given in the Manual of Aggregate and
5. Materials and Apparatus
2
Concrete Testing are recommended. )
5.1 Materials and equipment necessary to produce ends of
the reference cylinders that conform to planeness requirements
2. Referenced Documents
of Test Method C39/C39M and the requirements of Practice
3
2.1 ASTM Standards:
C617. This may include grinding equipment or capping mate-
rials and equipment to produce neat cement paste, high
1
This practice is under the jurisdiction of ASTM Committee C09 on Concrete
strength gypsum plaster, or sulfur mortar caps.
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.61on
5.2 Elastomeric Pads:
Testing for Strength.
1 1
5.2.1 Pads shall be ⁄2 6 ⁄16 in. [136 2 mm] thick and the
Current edition approved Feb. 1, 2010. Published March 2010. Originally
1
approved in 1993. Last previous edition approved in 2009 as C1231/C1231M–09. diametershallnotbemorethan ⁄16in.[2mm]smallerthanthe
DOI: 10.1520/C1231_C1231M-10.
inside diameter of the retaining ring.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
5.2.2 Pads shall be made from polychloroprene (neoprene)
Annual Book of ASTM Standards, Vol. 04.02.
3
meeting the requirements of Classification D2000 as follows:
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

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...

This document is not anASTM standard and is intended only to provide the user of anASTM 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–10
Standard Practice for
Use of Unbonded Caps in Determination of Compressive
1
Strength of Hardened Concrete Cylinders
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. 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 1500 psi [10 MPa]
or above 12 000 psi [85 MPa].
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 cylinders tested with unbonded caps rupture more violently than comparable
cylinders tested with bonded caps. The safety precautions given in the Manual of Aggregate and Concrete Testing are
2
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
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.
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 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 and are restrained from
excessivelateralspreadingbyplatesandmetalringstoprovideauniformdistributionofloadfromthebearingblocksofthetesting
machine to the ends of the concrete or mortar cylinders.
1
ThispracticeisunderthejurisdictionofASTMCommitteeC09onConcreteandConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.61onTesting
for Strength.
Current edition approved Feb. 1, 2010. Published March 2010. Originally approved in 1993. Last previous edition approved in 2009 as C1231/C1231M–09. DOI:
10.1520/C1231_C1231M-10.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol. 04.02.
3
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] 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

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C1231/C1231M–10
5. Materials and Apparatus
5.1 Materials and equipment necessary to produce ends of the reference cylinders that conform to planeness requirements of
Test Method C39/C39M and the requirements of Practice C617. This may include grinding equipment or capping materials and
equipment to produce neat cement paste, high strength gypsum plaster, or sulfur mortar caps.
5.2 Elastomeric Pads:
1 1 1
5.2.1 Padsshallbe ⁄2
...