ASTM C1550-08
(Test Method)Standard Test Method for Flexural Toughness of Fiber Reinforced Concrete (Using Centrally Loaded Round Panel)
Standard Test Method for Flexural Toughness of Fiber Reinforced Concrete (Using Centrally Loaded Round Panel)
SIGNIFICANCE AND USE
The post-crack behavior of plate-like, fiber-reinforced concrete structural members is well represented by a centrally loaded round panel test specimen that is simply supported on three pivots symmetrically arranged around its circumference. Such a test panel experiences bi-axial bending in response to a central point load and exhibits a mode of failure related to the in situ behavior of structures. The post-crack performance of round panels subject to a central point load can be represented by the energy absorbed by the panel up to a specified central deflection. In this test method, the energy absorbed up to a specified central deflection is taken to represent the ability of a fiber-reinforced concrete to redistribute stress following cracking.
Note 1—The use of three pivoted point supports in the test configuration results in determinate out-of-plane reactions prior to cracking, however the support reactions are indeterminate after cracking due to the unknown distribution of flexural resistance along each crack. There is also a change in the load resistance mechanism in the specimen as the test proceeds, starting with predominantly flexural resistance and progressing to tensile membrane action around the center as the imposed deflection is increased. The energy absorbed up to a specified central deflection is related to the toughness of the material but is specific to this specimen configuration because it is also determined by the support conditions and size of the specimen. Selection of the most appropriate central deflection to specify depends on the intended application for the material. The energy absorbed up to 5 mm central deflection is applicable to situations in which the material is required to hold cracks tightly closed at low levels of deformation. Examples include final linings in underground civil structures such as railway tunnels that may be required to remain water-tight. The energy absorbed up to 40 mm is more applicable to situations in that...
SCOPE
1.1 This test method covers the determination of flexural toughness of fiber-reinforced concrete expressed as energy absorption in the post-crack range using a round panel supported on three symmetrically arranged pivots and subjected to a central point load. The performance of specimens tested by this method is quantified in terms of the energy absorbed between the onset of loading and selected values of central deflection.
1.2 This test method provides for the scaling of results whenever specimens do not comply with the target thickness and diameter, as long as dimensions do not fall outside of given limits.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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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Designation: C1550 – 08
Standard Test Method for
Flexural Toughness of Fiber Reinforced Concrete (Using
1
Centrally Loaded Round Panel)
This standard is issued under the fixed designation C1550; 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* 3.2 Definitions of Terms Specific to This Standard:
3.2.1 central deflection—the net deflection at the center of
1.1 This test method covers the determination of flexural
the panel measured relative to a plane defined by the three
toughness of fiber-reinforced concrete expressed as energy
pivotsusedtosupportthepanel;thisisaconditioneddeflection
absorption in the post-crack range using a round panel sup-
that excludes extraneous deformations of the load train and
ported on three symmetrically arranged pivots and subjected to
local crushing of the panel at the point of load application and
a central point load. The performance of specimens tested by
points of support.
this method is quantified in terms of the energy absorbed
3.2.2 compliance—a measure of the tendency of a structure
between the onset of loading and selected values of central
to deflect under load, found as the inverse of stiffness or
deflection.
deflection divided by the corresponding load.
1.2 This test method provides for the scaling of results
3.2.3 load train—those parts of a testing machine that
whenever specimens do not comply with the target thickness
experience load and undergo straining during a mechanical
anddiameter,aslongasdimensionsdonotfalloutsideofgiven
test, including the actuator, frame, support fixtures, load cell,
limits.
and specimen.
1.3 The values stated in SI units are to be regarded as
3.2.4 toughness—the energy absorbed by the specimen
standard. No other units of measurement are included in this
equivalent to the area under the load-deflection curve between
standard.
the onset of loading and a specified central deflection.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 Moldedroundpanelsofcastfiber-reinforcedconcreteor
priate safety and health practices and determine the applica-
fiber-reinforced shotcrete are subjected to a central point load
bility of regulatory limitations prior to use.
while supported on three symmetrically arranged pivots. The
2. Referenced Documents load is applied through a hemispherical-ended steel piston
2 advanced at a prescribed rate of displacement. Load and
2.1 ASTM Standards:
deflection are recorded simultaneously up to a specified central
C31/C31M Practice for Making and Curing Concrete Test
deflection. The energy absorbed by the panel up to a specified
Specimens in the Field
central deflection is representative of the flexural toughness of
C125 Terminology Relating to Concrete and Concrete Ag-
the fiber-reinforced concrete panel.
gregates
C670 Practice for Preparing Precision and Bias Statements
5. Significance and Use
for Test Methods for Construction Materials
5.1 The post-crack behavior of plate-like, fiber-reinforced
3. Terminology concrete structural members is well represented by a centrally
loaded round panel test specimen that is simply supported on
3.1 Definitions—For definitions of terms used in this test
three pivots symmetrically arranged around its circumference.
method, refer to Terminology C125.
Such a test panel experiences bi-axial bending in response to a
central point load and exhibits a mode of failure related to the
1
This test method is under the jurisdiction of ASTM Committee C09 on
in situ behavior of structures. The post-crack performance of
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
round panels subject to a central point load can be represented
C09.42 on Fiber-Reinforced Concrete.
Current edition approved Oct. 1, 2008. Published October 2008. Originally by the energy absorbed by the panel up to a specified central
approved in 2002. Last previous edition approved in 2005 as C1550 – 05. DOI:
deflection. In this test method, the energy absorbed up to a
10.1520/C1550-08.
specified central deflection is taken to represent the ability of a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
fiber-reinforced concrete to redistribute stress following crack-
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
ing.
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM Internation
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:C1550–05 Designation: C 1550 – 08
Standard Test Method for
Flexural Toughness of Fiber Reinforced Concrete (Using
1
Centrally Loaded Round Panel)
This standard is issued under the fixed designation C 1550; 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 covers the determination of flexural toughness of fiber-reinforced concrete expressed as energy absorption
in the post-crack range using a round panel supported on three symmetrically arranged pivots and subjected to a central point load.
The performance of specimens tested by this method is quantified in terms of the energy absorbed between the onset of loading
and selected values of central deflection.
1.2 This test method provides for the scaling of results whenever specimens do not comply with the target thickness and
diameter, as long as dimensions do not fall outside of given limits.
1.3The values stated in SI units are to be regarded as the standard.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C 31/C 31M Practice for Making and Curing Concrete Test Specimens in the Field
C 125 Terminology Relating to Concrete and Concrete Aggregates
C 670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology C 125.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 central deflection—the net deflection at the center of the panel measured relative to a plane defined by the three pivots
usedtosupportthepanel;thisisaconditioneddeflectionthatexcludesextraneousdeformationsoftheloadtrainandlocalcrushing
of the panel at the point of load application and points of support.
3.2.2 compliance—a measure of the tendency of a structure to deflect under load, found as the inverse of stiffness or deflection
divided by the corresponding load.
3.2.3 load train—thosepartsofatestingmachinethatexperienceloadandundergostrainingduringamechanicaltest,including
the actuator, frame, support fixtures, load cell, and specimen.
3.2.4 toughness—the energy absorbed by the specimen equivalent to the area under the load-deflection curve between the onset
of loading and a specified central deflection.
4. Summary of Test Method
4.1 Moldedroundpanelsofcastfiber-reinforcedconcreteorfiber-reinforcedshotcretearesubjectedtoacentralpointloadwhile
supported on three symmetrically arranged pivots. The load is applied through a hemispherical-ended steel piston advanced at a
prescribed rate of displacement. Load and deflection are recorded simultaneously up to a specified central deflection. The energy
absorbed by the panel up to a specified central deflection is representative of the flexural toughness of the fiber-reinforced concrete
panel.
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 JulyOct. 1, 2005.2008. Published August 2005.October 2008. Originally approved in 2002. Last previous edition approved in 20042005 as
C1550-04.C 1550 – 05.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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C1550–08
5. Significance and Use
5.1 The post-crack behavior of plate-like, fiber-reinforced concrete structural members is well represented by a centrally loaded
round panel test specimen that is simply supported on three pivots symmetrically arranged around its circumference. Such
...
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