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ASTM C293-00

(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)

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 C78.
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.
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.

General Information

Status
Historical
Publication Date
09-Feb-2002
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 C293-94 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
Effective Date
10-Feb-2002
Replaced By
ASTM C293-02 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
Effective Date
10-Feb-2002

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ASTM C293-00 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)ASTM C293-00 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)
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ASTM C293-00 - 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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 293 – 00
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 compliance with specifications or as a basis for proportioning,
mixing and placement operations. This test method produces
1.1 This test method covers determination of the flexural
values of flexural strength significantly higher than Test
strength of concrete specimens by the use of a simple beam
Method C 78 (Note 1).
with center-point loading. It is not an alternative to Test
Method C 78.
NOTE 1—The testing laboratory performing this test method may be
1.2 The values stated in inch-pound units are to be regarded
evaluated in accordance with Practice C 1077.
as standard. The SI equivalent of inch-pound units has been
4. Apparatus
rounded where necessary for practical application.
1.3 This standard does not purport to address all of the 4.1 The testing machine shall conform to the requirements
of the sections on Basis of Verification, Corrections, and Time
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- Interval Between Verifications of Practices E 4. Hand operated
testing machines having pumps that do not provide a continu-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. ous loading to failure in one stroke are not permitted. Motor-
ized pumps or hand operated positive displacement pumps
2. Referenced Documents
having sufficient volume in one continuous stroke to complete
2.1 ASTM Standards: a test without requiring replenishment are permitted and shall
C 31 Practice for Making and Curing Concrete Test Speci- be capable of applying loads at a uniform rate without shock or
2
mens in the Field interruption.
C 78 Test Method for Flexural Strength of Concrete (Using 4.2 Loading Apparatus—The mechanism by which forces
2
Simple Beam with Third Point Loading) are applied to the specimen shall employ a load-applying block
C 192 Practice for Making and Curing Concrete Test Speci- and two specimen support blocks. It shall ensure that all forces
2
mens in the Laboratory are applied perpendicular to the face of the specimen without
C 617 Practice for Capping Cylindrical Concrete Speci- eccentricity. A diagram of an apparatus that accomplishes this
2
mens purpose is shown in Fig. 1.
C 1077 Practice for Laboratories Testing Concrete and Con- 4.2.1 All apparatus for making center-point loading flexure
crete Aggregates for Use in Construction and Criteria for tests shall be similar to Fig. 1 and maintain the span length and
2
Laboratory Evaluation central position of the load-applying block with respect to the
3
E 4 Practices for Force Verification of Testing Machines support blocks constant within 60.05 in. (61.3 mm).
4.2.2 Reactions shall be parallel to the direction of the
3. Significance and Use
applied load at all times during the test, and the ratio of the
3.1 This test method is used to determine the modulus of horizontal distance between the point of load application and
rupture of specimens prepared and cured in accordance with
nearest reaction to the depth of the beam shall be 1.5 6 2%.
Practices C 31 or C 192. The strength determined will vary 4.2.3 The load-applying and support blocks shall not be
1
where there are differences in specimen size, preparation,
more than 2 ⁄2 in. (64 mm) high, measured from the center or
moisture condition, or curing. the axis of pivot, and shall extend at least across the full width
3.2 The results of this test method may be used to determine
of the specimen. Each hardened bearing surface in contact with
the specimen shall not depart from a plane by more than 0.002
in. (0.05 mm) and shall be a portion of a cylinder, the axis of
1
This test method is under the jurisdiction of ASTM Committee C09 on
which is coincidental with either the axis of the rod or center
Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee
C09.61on Testing Concrete for Strength.
of the ball, whichever the block is pivoted upon. The angle
Current edition approved Dec. 10, 2000. Published June 2001. Originally
subtended by the curved surface of each block shall be at least
published as C 293 – 52 T. Last previous edition C 293 – 94.
2 45° (0.79 rad). The load-applying and support blocks shall be
Annual Book of ASTM Standards,
...

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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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4.1 Existing practices and test methods for fabricating fresh concrete test specimens are not suited to SCC. This practice provides requirements and procedures for fabricating test specimens with SCC having a slump flow of 500 mm [20 in.] or greater.
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4.1 This test method is of primary significance in determining the acceptability of aggregate with respect to the requirements of Specification C33/C33M.
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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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5.4 This test method does not measure the influence on in-place infiltration rate due to sealing of voids near the bottom of the pervious concrete slab. Visual inspection of concrete cores is the best approach for determining sealing of voids near the bottom of the pervious concrete slab.
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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ASTM C173/C173M-23(Test Method)
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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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Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete

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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