Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)

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1.1 This test method evaluates the flexural performance of fiber-reinforced concrete using parameters derived from the load-deflection curve obtained by testing a simply supported beam under third-point loading using a closed-loop, servo-controlled testing system.
1.2 This test method provides for the determination of first-peak and peak loads and the corresponding stresses calculated by inserting them in the formula for modulus of rupture given in Eqn. 1. It also requires determination of residual loads at specified deflections, and the corresponding residual strengths calculated by inserting them in the formula for modulus of rupture given in Eqn. 1 (see Note 1). At the option of the specifier of tests, it provides for determination of specimen toughness based on the area under the load-deflection curve up to a prescribed deflection (see Note 1).Note 1
Residual strength is not a true stress but an engineering stress computed using simple engineering bending theory for linear elastic materials and gross (uncracked) section properties.Note 1
Specimen toughness expressed in terms of the area under the load-deflection curve is an indication of the energy absorption capability of the particular test specimen, and its magnitude depends directly on the geometry of the test specimen and the loading configuration.
1.3 This test method utilizes two preferred specimen sizes of 100 by 100 by 350 mm (4 by 4 by 14 in.) tested on a 300 mm (12 in.) span, or 150 by 150 by 500 mm (6 by 6 by 20 in.) tested on a 450 mm (18 in.) span. A specimen size different from the two preferred specimen sizes is permissible.
1.4 Units 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.
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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ASTM C1609/C1609M-06 - Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)
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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: C 1609/C 1609M – 06
Standard Test Method for
Flexural Performance of Fiber-Reinforced Concrete (Using
1
Beam With Third-Point Loading)
This standard is issued under the fixed designation C 1609/C 1609M; 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.
1. Scope* priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This test method evaluates the flexural performance of
fiber-reinforced concrete using parameters derived from the
2. Referenced Documents
load-deflection curve obtained by testing a simply supported
2
2.1 ASTM Standards:
beam under third-point loading using a closed-loop, servo-
C 31/C 31M Practice for Making and Curing Concrete Test
controlled testing system.
Specimens in the Field
1.2 This test method provides for the determination of
C 42/C 42M Test Method for Obtaining and Testing Drilled
first-peak and peak loads and the corresponding stresses
Cores and Sawed Beams of Concrete
calculated by inserting them in the formula for modulus of
C78 Test Method for Flexural Strength of Concrete (Using
rupture given in Eq 1. It also requires determination of residual
Simple Beam with Third-Point Loading)
loads at specified deflections, and the corresponding residual
C 125 Terminology Relating to Concrete and Concrete
strengths calculated by inserting them in the formula for
Aggregates
modulus of rupture given in Eq 1 (see Note 1).At the option of
C 172 Practice for Sampling Freshly Mixed Concrete
the specifier of tests, it provides for determination of specimen
C 192/C 192M Practice for Making and Curing Concrete
toughness based on the area under the load-deflection curve up
Test Specimens in the Laboratory
to a prescribed deflection (see Note 2).
C 823 Practice for Examination and Sampling of Hardened
NOTE 1—Residual strength is not a true stress but an engineering stress
Concrete in Constructions
computed using simple engineering bending theory for linear elastic
C 1140 Practice for Preparing and Testing Specimens from
materials and gross (uncracked) section properties.
Shotcrete Test Panels
NOTE 2—Specimen toughness expressed in terms of the area under the
load-deflection curve is an indication of the energy absorption capability
3. Terminology
of the particular test specimen, and its magnitude depends directly on the
geometry of the test specimen and the loading configuration. 3.1 Definitions—The terms used in this test method are
defined in Terminology C 125.
1.3 This test method utilizes two preferred specimen sizes
3.2 Definitions of Terms Specific to This Standard:
of100by100by350mm(4by4by14in.)testedona300mm
3.2.1 end-point deflection—thedeflectionvalueontheload-
(12 in.) span, or 150 by 150 by 500 mm (6 by 6 by 20 in.)
1
deflection curve equal to ⁄150 of the span, or a larger value as
tested on a 450 mm (18 in.) span. A specimen size different
specified at the option of the specifier of tests.
from the two preferred specimen sizes is permissible.
3.2.2 first-peak load, P —the load value at the first point on
1
1.4 Units—The values stated in either SI units or inch-
the load-deflection curve where the slope is zero.
pound units are to be regarded separately as standard. The
3.2.3 first-peak deflection, d —the net deflection value on
1
values stated in each system may not be exact equivalents;
the load-deflection curve at first-peak load.
therefore,eachsystemshallbeusedindependentlyoftheother.
3.2.4 first-peak strength f —the stress value obtained when
1
Combining values from the two systems may result in non-
the first-peak load is inserted in the formula for modulus of
conformance with the standard.
rupture given in Eq 1.
1.5 This standard does not purport to address all of the
3.2.5 load-deflection curve—the plot of load versus net
safety concerns, if any, associated with its use. It is the
deflection of a flexural beam specimen loaded to the end-point
responsibility of the user of this standard to establish appro-
deflection.
1
This test method is under the jurisdiction of ASTM Committee C09 on
2
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee For referenced ASTM standards, visit the ASTM website, www.astm.org, or
C09.42 on Fiber-Reinforced Concrete. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Dec. 15, 2006. Published January 2007. Originally Standards volume information, refer to the standard’s Document Summary page on
approvedin2005.Lastpreviouseditionapprovedin2005asC 1609/C 1609M – 05. the ASTM website.
*A Summary of Changes section appears at the end of
...

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