ASTM C1609/C1609M-19a
(Test Method)Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)
Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)
SIGNIFICANCE AND USE
5.1 The first-peak strength characterizes the flexural behavior of the fiber-reinforced concrete up to the onset of cracking, while residual strengths at specified deflections characterize the residual capacity after cracking. Specimen toughness is a measure of the energy absorption capacity of the test specimen. The appropriateness of each parameter depends on the nature of the proposed application and the level of acceptable cracking and deflection serviceability. Fiber-reinforced concrete is influenced in different ways by the amount and type of fibers in the concrete. In some cases, fibers may increase the residual load and toughness capacity at specified deflections while producing a first-peak strength equal to or only slightly greater than the flexural strength of the concrete without fibers. In other cases, fibers may significantly increase the first-peak and peak strengths while affecting a relatively small increase in residual load capacity and specimen toughness at specified deflections.
5.2 The first-peak strength, peak strength, and residual strengths determined by this test method reflect the behavior of fiber-reinforced concrete under static flexural loading. The absolute values of energy absorption obtained in this test are of little direct relevance to the performance of fiber-reinforced concrete structures since they depend directly on the size and shape of the specimen and the loading arrangement.
5.3 The results of this test method may be used for comparing the performance of various fiber-reinforced concrete mixtures or in research and development work. They may also be used to monitor concrete quality, to verify compliance with construction specifications, obtain flexural strength data on fiber-reinforced concrete members subject to pure bending, or to evaluate the quality of concrete in service.
5.4 The results of this standard test method are dependent on the size of the specimen.
Note 5: The results obtained using one size molded ...
SCOPE
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 Eq 1. It also requires determination of residual loads at specified deflections, the corresponding residual strengths calculated by inserting them in the formula for modulus of rupture given in Eq 1 (see Note 1). It provides for determination of specimen toughness based on the area under the load-deflection curve up to a prescribed deflection (see Note 2) and the corresponding equivalent flexural strength ratio.
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 2: 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 w...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1609/C1609M − 19a
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 C1609/C1609M; 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.
1. Scope* 1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method evaluates the flexural performance of
responsibility of the user of this standard to establish appro-
fiber-reinforced concrete using parameters derived from the
priate safety, health, and environmental practices and deter-
load-deflection curve obtained by testing a simply supported
mine the applicability of regulatory limitations prior to use.
beam under third-point loading using a closed-loop, servo-
1.6 This international standard was developed in accor-
controlled testing system.
dance with internationally recognized principles on standard-
1.2 This test method provides for the determination of
ization established in the Decision on Principles for the
first-peak and peak loads and the corresponding stresses
Development of International Standards, Guides and Recom-
calculated by inserting them in the formula for modulus of
mendations issued by the World Trade Organization Technical
rupture given in Eq 1. It also requires determination of residual
Barriers to Trade (TBT) Committee.
loads at specified deflections, the corresponding residual
strengths calculated by inserting them in the formula for
2. Referenced Documents
modulus of rupture given in Eq 1 (see Note 1). It provides for
2
2.1 ASTM Standards:
determination of specimen toughness based on the area under
C31/C31M Practice for Making and Curing Concrete Test
the load-deflection curve up to a prescribed deflection (see
Specimens in the Field
Note 2) and the corresponding equivalent flexural strength
C42/C42M Test Method for Obtaining and Testing Drilled
ratio.
Cores and Sawed Beams of Concrete
NOTE 1—Residual strength is not a true stress but an engineering stress
C78/C78M Test Method for Flexural Strength of Concrete
computed using simple engineering bending theory for linear elastic
(Using Simple Beam with Third-Point Loading)
materials and gross (uncracked) section properties.
C125 Terminology Relating to Concrete and Concrete Ag-
NOTE 2—Specimen toughness expressed in terms of the area under the
load-deflection curve is an indication of the energy absorption capability
gregates
of the particular test specimen, and its magnitude depends directly on the
C172/C172M Practice for Sampling Freshly Mixed Con-
geometry of the test specimen and the loading configuration.
crete
1.3 This test method utilizes two preferred specimen sizes C192/C192M Practice for Making and Curing Concrete Test
of100by100by350mm[4by4by14in.]testedona300mm
Specimens in the Laboratory
[12 in.] span, or 150 by 150 by 500 mm [6 by 6 by 20 in.] C823/C823M Practice for Examination and Sampling of
tested on a 450 mm [18 in.] span. A specimen size different
Hardened Concrete in Constructions
from the two preferred specimen sizes is permissible. C1140/C1140M Practice for Preparing and Testing Speci-
mens from Shotcrete Test Panels
1.4 Units—The values stated in either SI units or inch-
C1812/C1812M Practice for Design of Journal Bearing Sup-
pound units are to be regarded separately as standard. The
ports to be Used in Fiber Reinforced Concrete BeamTests
values stated in each system may not be exact equivalents;
E4 Practices for Force Verification of Testing Machines
therefore,eachsystemshallbeusedindependentlyoftheother.
Combining values from the two systems may result in non-
3. Terminology
conformance with the standard.
3.1 Definitions—The terms used in this test method are
defined in Terminology C125.
1
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
2
C09.42 on Fiber-Reinforced Concrete. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 15, 2019. Published February 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2019 as C1609/C1609M – 19. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C1609_C1609M-19A. the ASTM website.
*A Summary of Change
...
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: C1609/C1609M − 19 C1609/C1609M − 19a
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 C1609/C1609M; 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.
1. Scope*
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 Eq 1. It also requires determination of residual loads at specified
deflections, the corresponding residual strengths calculated by inserting them in the formula for modulus of rupture given in Eq
1 (see Note 1). It provides for determination of specimen toughness based on the area under the load-deflection curve up to a
prescribed deflection (see Note 2) and the corresponding equivalent flexural strength ratio.
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 2—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.
1.5 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C78/C78M Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
C125 Terminology Relating to Concrete and Concrete Aggregates
C172/C172M Practice for Sampling Freshly Mixed Concrete
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C823/C823M Practice for Examination and Sampling of Hardened Concrete in Constructions
C1140/C1140M Practice for Preparing and Testing Specimens from Shotcrete Test Panels
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.42 on
Fiber-Reinforced Concrete.
Current edition approved May 1, 2019Dec. 15, 2019. Published May 2019February 2020. Originally approved in 2005. Last previous edition approved in 20122019 as
C1609/C1609MC1609/C1609M – 19. – 12. DOI: 10.1520/C1609_C1609M-19.10.1520/C1609_C1609M-19A.
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
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...
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