ASTM C1609/C1609M-05

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Designation: C 1609/C 1609M – 05
Standard Test Method for
Flexural Performance of Fiber-Reinforced Concrete (Using
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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
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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 Units—The values stated in either SI units or inch-
3.2 Definitions of Terms Specific to This Standard:
pound units are to be regarded separately as standard. The
3.2.1 end-point deflection—thedeflectionvalueontheload-
values stated in each system may not be exact equivalents;
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deflection curve equal to ⁄150 of the span, or a larger value as
therefore,eachsystemshallbeusedindependentlyoftheother.
specified at the option of the specifier of tests.
Combining values from the two systems may result in non-
3.2.2 first-peak load, P —the load value at the first point on
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conformance with the standard.
the load-deflection curve where the slope is zero.
1.4 This standard does not purport to address all of the
3.2.3 first-peak deflection, d —the net deflection value on
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safety concerns, if any, associated with its use. It is the
the load-deflection curve at first-peak load.
responsibility of the user of this standard to establish appro-
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This test method is under the jurisdiction of ASTM Committee C09 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
C09.42 on Fiber-Reinforced Concrete. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 15, 2005. Published January 2006. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C 1609/C 1609M – 05
3.2.4 first-peak strength f —the stress value obtained when digitally and subsequently used to plot a load-deflection curve.
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the first-peak load is inserted in the formula for modulus of Points termed first-peak, peak, and residual loads at specified
rupture given in Eq 1. deflectionsareidentifiedonthecurve,andareusedtocalculate
3.2.5 load-deflection curve—the plot of load versus net flexural performance parameters.
deflection of a flexural beam specimen loaded to the end-point
deflection.
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