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ASTM C1231/C1231M-07

Historical Revision

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

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1.1 This practice covers requirements for a capping system using unbonded caps for testing concrete cylinders molded in accordance with Practice C 31/C 31M or C 192/C 192M. 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 inch-pound or SI units shall be regarded as standard. SI units are shown in brackets. That values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining the values in any way.

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.)


This practice provides for using an unbonded capping system in testing hardened concrete cylinders made in accordance with Practices C 31/C 31M or C 192/C 192M in lieu of the capping systems described in Practice C 617.

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.

SDO ASTM: ASTM International
Document Number C1231
Publication Date July 15, 2007
Language en - English
Page Count 4
Revision Level 07
Supercedes
Committee C09.61
Publish Date Document Id Type View
Oct. 1, 2023 C1231_C1231M-23 Revision
Dec. 1, 2015 C1231_C1231M-15 Revision
July 1, 2014 C1231_C1231M-14 Revision
Dec. 15, 2013 C1231_C1231M-13 Revision
Nov. 15, 2012 C1231_C1231M-12 Revision
Oct. 1, 2010 C1231_C1231M-10A Revision
Feb. 1, 2010 C1231_C1231M-10 Revision
Jan. 1, 2009 C1231_C1231M-09 Revision
July 1, 2008 C1231_C1231M-08A Revision
Jan. 1, 2008 C1231_C1231M-08 Revision
July 15, 2007 C1231_C1231M-07 Revision
Dec. 15, 2006 C1231_C1231M-06 Revision
Aug. 8, 2000 C1231_C1231M-00E01 Revision