ASTM C293/C293M-15
(Test Method)Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
SIGNIFICANCE AND USE
3.1 This test method is used to determine the modulus of rupture of specimens prepared and cured in accordance with Practices C31/C31M or C192/C192M. The strength determined will vary where there are differences in specimen size, preparation, moisture condition, or curing.
3.2 The results of this test method may be used to determine compliance with specifications or as a basis for proportioning, mixing and placement operations. This test method produces values of flexural strength significantly higher than Test Method C78/C78M.
SCOPE
1.1 This test method covers determination of the flexural strength of concrete specimens by the use of a simple beam with center-point loading. Test Method C293/C293M is not an alternative to Test Method C78/C78M.
1.2 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.
1.3 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.
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Designation: C293/C293M − 15
StandardTest Method for
Flexural Strength of Concrete (Using Simple Beam With
1
Center-Point Loading)
This standard is issued under the fixed designation C293/C293M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3. Significance and Use
1.1 This test method covers determination of the flexural
3.1 This test method is used to determine the modulus of
strength of concrete specimens by the use of a simple beam rupture of specimens prepared and cured in accordance with
with center-point loading. Test Method C293/C293M is not an
Practices C31/C31M or C192/C192M. The strength deter-
alternative to Test Method C78/C78M. mined will vary where there are differences in specimen size,
preparation, moisture condition, or curing.
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in 3.2 The results of this test method may be used to determine
each system may not be exact equivalents; therefore, each
compliance with specifications or as a basis for proportioning,
system shall be used independently of the other. Combining mixing and placement operations. This test method produces
values from the two systems may result in non-conformance
values of flexural strength significantly higher than Test
with the standard. Method C78/C78M.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 Testing Machine—The testing machine shall conform to
priate safety and health practices and determine the applica-
the requirements of the sections on Basis of Verification,
bility of regulatory limitations prior to use.
Corrections, and Time Interval Between Verifications of Prac-
ticesE4.Handoperatedtestingmachineshavingpumpsthatdo
2. Referenced Documents
notprovideacontinuousloadingtofailureinonestrokearenot
2
permitted. Motorized pumps or hand operated positive dis-
2.1 ASTM Standards:
placement pumps having sufficient volume in one continuous
C31/C31M Practice for Making and Curing Concrete Test
stroke to complete a test without requiring replenishment are
Specimens in the Field
permitted and shall be capable of applying loads at a uniform
C78/C78M Test Method for Flexural Strength of Concrete
ratewithoutshockorinterruption.Thetestingmachineshallbe
(Using Simple Beam with Third-Point Loading)
equipped with a means of recording or holding the peak value
C192/C192M Practice for Making and Curing Concrete Test
that will indicate the maximum load applied to the specimen
Specimens in the Laboratory
during a test, to within 1 % accuracy of the load being applied.
C617 Practice for Capping Cylindrical Concrete Specimens
C1077 Practice forAgencies Testing Concrete and Concrete
4.2 Loading Apparatus—The mechanism by which forces
Aggregates for Use in Construction and Criteria for
are applied to the specimen shall employ a load-applying block
Testing Agency Evaluation
and two specimen support blocks. It shall ensure that all forces
E4 Practices for Force Verification of Testing Machines
are applied perpendicular to the face of the specimen without
eccentricity. A diagram of an apparatus that accomplishes this
purpose is shown in Fig. 1.
1
This test method is under the jurisdiction of ASTM Committee C09 on 4.2.1 All apparatus for making center-point loading flexure
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
tests shall be similar to Fig. 1 and maintain the span length and
C09.61 on Testing for Strength.
central position of the load-applying block with respect to the
Current edition approved Dec. 1, 2015. Published February 2016. Originally
support blocks constant within 61.0 mm [60.05 in.].
approved in 1952. Last previous edition approved in 2010 as C293/C293M – 10.
DOI: 10.1520/C0293_C0293M-15.
4.2.2 Reactions shall be parallel to the direction of the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
applied load at all times during the test, and the ratio of the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
horizontal distance between the point of load application and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. nearest reaction to the depth of the beam shall be 1.5 62%.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100
...
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: C293/C293M − 10 C293/C293M − 15
Standard Test Method for
Flexural Strength of Concrete (Using Simple Beam With
1
Center-Point Loading)
This standard is issued under the fixed designation C293/C293M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers determination of the flexural strength of concrete specimens by the use of a simple beam with
center-point loading. It Test Method C293/C293M is not an alternative to Test Method C78/C78M.
1.2 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.
1.3 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field
C78/C78M Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C617 Practice for Capping Cylindrical Concrete Specimens
C1077 Practice for Agencies Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Testing Agency
Evaluation
E4 Practices for Force Verification of Testing Machines
3. Significance and Use
3.1 This test method is used to determine the modulus of rupture of specimens prepared and cured in accordance with Practices
C31/C31M or C192/C192M. The strength determined will vary where there are differences in specimen size, preparation, moisture
condition, or curing.
3.2 The results of this test method may be used to determine compliance with specifications or as a basis for proportioning,
mixing and placement operations. This test method produces values of flexural strength significantly higher than Test Method
C78/C78M.
4. Apparatus
4.1 Testing Machine—The testing machine shall conform to the requirements of the sections on Basis of Verification,
Corrections, and Time Interval Between Verifications of Practices E4. Hand operated testing machines having pumps that do not
provide a continuous loading to failure in one stroke are not permitted. Motorized pumps or hand operated positive displacement
pumps having sufficient volume in one continuous stroke to complete a test without requiring replenishment are permitted and shall
1
This test method 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 Aug. 1, 2010Dec. 1, 2015. Published September 2010February 2016. Originally approved in 1952. Last previous edition approved in 20082010
as C293C293/C293M – 08.10. DOI: 10.1520/C0293_C0293M-10.10.1520/C0293_C0293M-15.
2
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
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C293/C293M − 15
be capable of applying loads at a uniform rate without shock or interruption. The testing machine shall be equipped with a means
of recording or holding the peak value that will indicate the maximum load applied to the specimen during a test, to within 1 %
accuracy of the load being applied.
4.2 Loading Apparatus—The mechanism by which forces are applied to the specimen shall employ a load-applying block and
two specimen support blocks. It shall ensure that all forces are applied perpendicular to the face of the specimen without
eccentricity. A diagram of an apparatus
...
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