ASTM C120/C120M-15
(Test Method)Standard Test Methods of Flexure Testing of Slate (Breaking Load, Modulus of Rupture, Modulus of Elasticity)
Standard Test Methods of Flexure Testing of Slate (Breaking Load, Modulus of Rupture, Modulus of Elasticity)
SIGNIFICANCE AND USE
4.1 These test methods are useful in indicating the differences in flexure (breaking load, modulus of rupture, modulus of elasticity) between various slates. These test methods also provide one element in the comparison of slates.
SCOPE
1.1 These test methods cover determination of the breaking load, modulus of rupture and modulus of elasticity of slate by means of flexure tests.
1.2 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.
1.3 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: C120/C120M − 15
StandardTest Methods of
Flexure Testing of Slate (Breaking Load, Modulus of
1
Rupture, Modulus of Elasticity)
This standard is issued under the fixed designation C120/C120M; 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.
INTRODUCTION
Due to the unique properties of slate, the flexure test is better adapted to use for strength and
elasticity determinations than either compression or tension tests. Furthermore, several uses of slates
are such that these determinations are of special interest and value, besides furnishing comparative
data.
The property of slate termed “grain” causes a slab of the material to break transversely in one
direction somewhat more readily than at right angles to this direction. For this reason it is desirable
to test the strength and elasticity both parallel and perpendicular to the grain.
Breaking load test results for samples of roofing slate are only valid for the commercial supply of
slates of that thickness or greater. For the commercial supply of thinner roofings slates, testing on
samples of the minimum specified thickness must be conducted.
When comparing slates of equal thickness, but from various sources, slates which meet the required
breaking load at the lowest specimen thickness will yield the best performance on the roof in terms
of resistance to impact damage.
1. Scope 2. Referenced Documents
2
1.1 These test methods cover determination of the breaking
2.1 ASTM Standards:
load, modulus of rupture and modulus of elasticity of slate by
C119 Terminology Relating to Dimension Stone
means of flexure tests.
C1799 Guide to Dimension Stone Test Specimen Sampling
and Preparation
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3. Terminology
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
3.1 Definitions—All definitions are in accordance with Ter-
values from the two systems may result in non-conformance
minology C119.
with the standard.
1.3 This standard does not purport to address all of the 4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 These test methods are useful in indicating the differ-
responsibility of the user of this standard to establish appro-
ences in flexure (breaking load, modulus of rupture, modulus
priate safety and health practices and determine the applica-
of elasticity) between various slates. These test methods also
bility of regulatory limitations prior to use.
provide one element in the comparison of slates.
1
These test methods are under the jurisdiction of ASTM Committee C18 on
Dimension Stone and are the direct responsibility of Subcommittee C18.01 on Test
2
Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2015. Published November 2015. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approvedin1925.Lastpreviouseditionapprovedin2012asC120/C120M-12.DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0120_C0120M-15. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C120/C120M − 15
5. Apparatus the desired number of test specimens. When perceptible
variations occur, the purchaser may select as many samples as
5.1 Testing Machine—The accuracy of the testing machine
are necessary for determining the variations in flexure (break-
shall be within 1 % for the range from 10 to 1000 lbf [50 to
ing load, modulus of rupture, modulus of elasticity).
5000 N].
NOTE 1—Refer to Guide C1799 for additional information on selecting,
5.2 Load Application and Support Blocks—The supports for
preparing, and conditioning test specimens.
the specimen shall be of the rocker type (Fig. 1) with the edges
BREAKING LOAD AND MODULUS OF RUPTURE
at least as long as the width of the specimen. The load
application block may be of either the rocker or rigid type. The
7. Test Specimens
portions of the load application and support blocks contacting
7.1 Structural or Electrical Slate—Six representative
1
the stone shall be rounded, with a nominal radius of ⁄2 in. [13
1
specimens, 12 by 1 ⁄2 by 1 in. [300 by 40 by 25 mm] in size,
mm].
of the particular slate under consideration shall be tested.
6. Sampling
7.2 Roofing Slate—At least ten specimens 4 in. [100 mm] in
3
6.1 Select the sample to represe
...
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: C120/C120M − 12 C120/C120M − 15
Standard Test Methods of
Flexure Testing of Slate (Breaking Load, Modulus of
1
Rupture, Modulus of Elasticity)
This standard is issued under the fixed designation C120/C120M; 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.
INTRODUCTION
Due to the unique properties of slate, the flexure test is better adapted to use for strength and
elasticity determinations than either compression or tension tests. Furthermore, several uses of slates
are such that these determinations are of special interest and value, besides furnishing comparative
data.
The property of slate termed “grain” causes a slab of the material to break transversely in one
direction somewhat more readily than at right angles to this direction. For this reason it is desirable
to test the strength and elasticity both parallel and perpendicular to the grain.
Breaking load test results for samples of roofing slate are only valid for the commercial supply of
slates of that thickness or greater. For the commercial supply of thinner roofings slates, testing on
samples of the minimum specified thickness must be conducted.
When comparing slates of equal thickness, but from various sources, slates which meet the required
breaking load at the lowest specimen thickness will yield the best performance on the roof in terms
of resistance to impact damage.
1. Scope
1.1 These test methods cover determination of the breaking load, modulus of rupture and modulus of elasticity of slate by means
of flexure tests.
1.2 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.
1.3 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:
C119 Terminology Relating to Dimension Stone
C1799 Guide to Dimension Stone Test Specimen Sampling and Preparation
3. Terminology
3.1 Definitions—All definitions are in accordance with Terminology C119.
4. Significance and Use
4.1 These test methods are useful in indicating the differences in flexure (breaking load, modulus of rupture, modulus of
elasticity) between various slates. These test methods also provide one element in the comparison of slates.
1
These test methods are under the jurisdiction of ASTM Committee C18 on Dimension Stone and are the direct responsibility of Subcommittee C18.01 on Test Methods.
Current edition approved Oct. 15, 2012Nov. 1, 2015. Published November 2012November 2015. Originally approved in 1925. Last previous edition approved in 20092012
as C120/C120M-09.-12. DOI: 10.1520/C0120_C0120M-12.10.1520/C0120_C0120M-15.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C120/C120M − 15
5. Apparatus
5.1 Testing Machine—The accuracy of the testing machine shall be within 1 % for the range from 10 to 1000 lbf [50 to 5000
N].
5.2 Load Application and Support Blocks—The supports for the specimen shall be of the rocker type (Fig. 1) with the edges
at least as long as the width of the specimen. The load application block may be of either the rocker or rigid type. The portions
1
of the load application and support blocks contacting the stone shall be rounded, with a nominal radius of ⁄2 in. [13 mm].
6. Sampling
6.1 Select the sample to represent a true average of the type or grade of stone under consideration and of the quality supplied
to the market under the type designation to be tested. The sample may be selected by the purchaser or his authorized representative
from the quarried stone or taken from the natural ledge
...
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