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Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders
Automaticky přeložený název:
Standardní praktiky pro použití nespojené krytky Stanovení pevnosti v tlaku ztvrdlého betonu Válce
NORMA vydána dne 1.7.2014
Označení normy: ASTM C1231/C1231M-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.7.2014
Kód zboží: NS-10162
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
cap, compressive strength, concrete, concrete test, elastomeric, neoprene, pad cap, rubber, unbonded cap, ICS Number Code 91.100.30 (Concrete and concrete products)
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 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. |
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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 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
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.
Standard Practice for Making and Curing
Concrete Test Specimens in the Field Standard Test Method for Compressive
Strength of Cylindrical Concrete Specimens Standard Classification System for Rubber
Products in Automotive Applications Standard Practice for Making and Curing
Concrete Test Specimens in the Laboratory Standard Practice for Capping Cylindrical
Concrete Specimens Standard Test Method for Obtaining and
Testing Drilled Cores and Sawed Beams of Concrete |
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