ASTM C1550-12
(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 − 12
StandardTest 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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Terminology
3.1 Definitions—For definitions of terms used in this test
1.1 This test method covers the determination of flexural
method, refer to Terminology C125.
toughness of fiber-reinforced concrete expressed as energy
absorption in the post-crack range using a round panel sup-
3.2 Definitions of Terms Specific to This Standard:
portedonthreesymmetricallyarrangedpivotsandsubjectedto
3.2.1 central deflection—the net deflection at the center of
a central point load. The performance of specimens tested by
the panel measured relative to a plane defined by the three
this method is quantified in terms of the energy absorbed
pivotsusedtosupportthepanel;thisisaconditioneddeflection
between the onset of loading and selected values of central
that excludes extraneous deformations of the load train and
deflection.
local crushing of the panel at the point of load application and
points of support.
1.2 This test method provides for the scaling of results
whenever specimens do not comply with the target thickness 3.2.2 compliance—a measure of the tendency of a structure
to deflect under load, found as the inverse of stiffness or
anddiameter,aslongasdimensionsdonotfalloutsideofgiven
limits. deflection divided by the corresponding load.
3.2.3 load train—those parts of a testing machine that
1.3 The values stated in SI units are to be regarded as
experience load and undergo straining during a mechanical
standard. No other units of measurement are included in this
test, including the actuator, frame, support fixtures, load cell,
standard.
and specimen.
1.4 This standard does not purport to address all of the
3.2.4 toughness—the energy absorbed by the specimen
safety concerns, if any, associated with its use. It is the
equivalent to the area under the load-deflection curve between
responsibility of the user of this standard to establish appro-
the onset of loading and a specified central deflection.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Test Method
4.1 Moldedroundpanelsofcastfiber-reinforcedconcreteor
2. Referenced Documents
fiber-reinforced shotcrete are subjected to a central point load
2
2.1 ASTM Standards:
while supported on three symmetrically arranged pivots. The
C31/C31MPractice for Making and Curing Concrete Test
load is applied through a hemispherical-ended steel piston
Specimens in the Field
advanced at a prescribed rate of displacement. Load and
C125Terminology Relating to Concrete and Concrete Ag-
deflectionarerecordedsimultaneouslyuptoaspecifiedcentral
gregates
deflection. The energy absorbed by the panel up to a specified
C670Practice for Preparing Precision and Bias Statements
central deflection is representative of the flexural toughness of
for Test Methods for Construction Materials
the fiber-reinforced concrete panel.
5. Significance and Use
1
This test method is under the jurisdiction of ASTM Committee C09 on
5.1 The post-crack behavior of plate-like, fiber-reinforced
Concrete and ConcreteAggregatesand is the direct responsibility of Subcommittee
concrete structural members is well represented by a centrally
C09.42 on Fiber-Reinforced Concrete.
loaded round panel test specimen that is simply supported on
Current edition approved June 1, 2012. Published August 2012. Originally
three pivots symmetrically arranged around its circumference.
approved in 2002. Last previous edition approved in 2010 as C1550–10a. DOI:
10.1520/C1550-12.
Such a test panel experiences bi-axial bending in response to a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
central point load and exhibits a mode of failure related to the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in situ behavior of structures. The post-crack performance of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. round panels subject to a central point load can be represented
*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
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C1550 − 12
representative of in situ behavior when they are produced by spraying
by the energy absorbed by the panel up to a specified cen
...
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:C1550–10a Designation: C1550 – 12
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*
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field
C125 Terminology Relating to Concrete and Concrete Aggregates
C670 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 C125.
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 JulyJune 1, 2010.2012. PublishedAugust 2010.2012. Originally approved in 2002. Last previous edition approved in 2010 as C1550–10a. DOI:
10.1520/C1550-10a.10.1520/C1550-12.
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
---------------------- Page: 1 ----------------------
C1550 – 12
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 a test
panel experiences bi-axial bending in response t
...
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