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ASTM C293-07

(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
This test method is used to determine the modulus of rupture of specimens prepared and cured in accordance with Practices C 31 or C 192. The strength determined will vary where there are differences in specimen size, preparation, moisture condition, or curing.
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 C 78 (Note 1).
Note 1—The testing laboratory performing this test method may be evaluated in accordance with Practice C 1077.
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 is not an alternative to Test Method C 78.
1.2 The values stated in inch-pound units are to be regarded as standard. The SI equivalent of inch-pound units has been rounded where necessary for practical application.
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.

General Information

Status
Historical
Publication Date
14-Jul-2007
ICS
91.100.30 - Concrete and concrete products
Technical Committee
C09 - Concrete and Concrete Aggregates
Drafting Committee
C09.61 - Testing for Strength
Current Stage
Ref Project

Relations

Replaces
ASTM C293-02 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
Effective Date
15-Jul-2007
Replaced By
ASTM C293-08 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
Effective Date
01-Feb-2008

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ASTM C293-07 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)ASTM C293-07 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
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ASTM C293-07 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
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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:C293–07
Standard Test Method for
Flexural Strength of Concrete (Using Simple Beam With
1
Center-Point Loading)
This standard is issued under the fixed designation C 293; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* where there are differences in specimen size, preparation,
moisture condition, or curing.
1.1 This test method covers determination of the flexural
3.2 The results of this test method may be used to determine
strength of concrete specimens by the use of a simple beam
compliance with specifications or as a basis for proportioning,
with center-point loading. It is not an alternative to Test
mixing and placement operations. This test method produces
MethodC78.
values of flexural strength significantly higher than Test
1.2 The values stated in inch-pound units are to be regarded
MethodC78 (Note 1).
as standard. The SI equivalent of inch-pound units has been
rounded where necessary for practical application.
NOTE 1—The testing laboratory performing this test method may be
1.3 This standard does not purport to address all of the evaluated in accordance with Practice C 1077.
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 4.1 The testing machine shall conform to the requirements
of the sections on Basis of Verification, Corrections, and Time
bility of regulatory limitations prior to use.
Interval Between Verifications of PracticesE4. Hand operated
2. Referenced Documents
testing machines having pumps that do not provide a continu-
2
2.1 ASTM Standards: ous loading to failure in one stroke are not permitted. Motor-
C 31/C 31M Practice for Making and Curing Concrete Test ized pumps or hand operated positive displacement pumps
Specimens in the Field having sufficient volume in one continuous stroke to complete
C78 Test Method for Flexural Strength of Concrete (Using a test without requiring replenishment are permitted and shall
Simple Beam with Third-Point Loading) be capable of applying loads at a uniform rate without shock or
C 192/C 192M Practice for Making and Curing Concrete interruption.
Test Specimens in the Laboratory 4.2 Loading Apparatus—The mechanism by which forces
C 617 Practice for Capping Cylindrical Concrete Speci- are applied to the specimen shall employ a load-applying block
mens and two specimen support blocks. It shall ensure that all forces
C 1077 PracticeforLaboratoriesTestingConcreteandCon- are applied perpendicular to the face of the specimen without
crete Aggregates for Use in Construction and Criteria for eccentricity. A diagram of an apparatus that accomplishes this
Laboratory Evaluation purpose is shown in Fig. 1.
E4 Practices for Force Verification of Testing Machines 4.2.1 All apparatus for making center-point loading flexure
tests shall be similar to Fig. 1 and maintain the span length and
3. Significance and Use
central position of the load-applying block with respect to the
3.1 This test method is used to determine the modulus of
support blocks constant within 60.05 in. (61.3 mm).
rupture of specimens prepared and cured in accordance with 4.2.2 Reactions shall be parallel to the direction of the
Practices C 31 or C 192. The strength determined will vary
applied load at all times during the test, and the ratio of the
horizontal distance between the point of load application and
nearest reaction to the depth of the beam shall be 1.5 62%.
1
This test method is under the jurisdiction of ASTM Committee C09 on
4.2.3 The load-applying and support blocks shall not be
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
1
more than 2 ⁄2 in. (64 mm) high, measured from the center or
C09.61 on Testing for Strength.
Current edition approved July 15, 2007. Published August 2007. Originally the axis of pivot, and shall extend at least across the full width
approved in 1952. Last previous edition approved in 2002 as C 293 – 02.
of the specimen. Each hardened bearing surface in contact with
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the specimen shall not depart from a plane by more than 0.002
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in. (0.05 mm) and shall be a portion of a cylinder, the axis of
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 th
...

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SCOPE
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Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

ABSTRACT
This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. A concrete cylinder mold assembly consisting of a mold and a tubular support member is fastened within the concrete formwork prior to placement of the concrete. The elevation of the mold upper edge is adjusted to correspond to the plane of the finished slab surface. The mold support prevents direct contact of the slab concrete with the outside of the mold and permits its easy removal from the hardened concrete. Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection. Consolidation of concrete in the mold may be varied to simulate the conditions of placement. Internal vibration of concrete in the mold is prohibited except under special circumstances.
SIGNIFICANCE AND USE
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SIGNIFICANCE AND USE
5.1 Tests performed at the same location across a span of years may be used to detect a reduction of infiltration rate of the pervious concrete, thereby identifying the need for remediation.  
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SCOPE
1.1 This test method covers the determination of the field water infiltration rate of in place pervious concrete.
Note 1: For permeable unit pavement systems, Test Method C1781/C1781M should be used. Test Method C1781/C1781M is functionally identical to this test method but includes added provisions for positioning and securing the test ring to a discontinuous surface. Both tests methods give comparable results  
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Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

SIGNIFICANCE AND USE
4.1 This test method covers the determination of the air content of freshly mixed concrete. It measures the air contained in the mortar fraction of the concrete, but is not affected by air that may be present inside porous aggregate particles.  
4.1.1 Therefore, this is the appropriate test to determine the air content of concretes containing lightweight aggregates, air-cooled slag, and highly porous or vesicular natural aggregates.  
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SCOPE
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ABSTRACT
This test method covers determination of the density of freshly mixed concrete and gives formulas for calculating the unit weight, yield or relative yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials. The test method shall use the following apparatuses: balance or scale; tamping rod, which is a round straight steel rod having the tamping end rounded to a hemispherical tip; internal vibrator which may have rigid of flexible shafts, preferably powered by electric motors; measure, which is a cylindrical container made of steel or other suitable metal specified herein; strike-off plate; mallet; and scoop of a size large enough so each amount of concrete obtained from the sampling receptacle is representative and small enough so it is not spilled during placement in the measure.
SCOPE
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