ASTM C120-06e1
(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
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.
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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Standards Content (Sample)
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Designation:C120–06
Standard Test Methods of
Flexure Testing of Slate (Breaking Load, Modulus of
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Rupture, Modulus of Elasticity)
This standard is issued under the fixed designation C 120; 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.
This standard has been approved for use by agencies of the Department of Defense.
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e NOTE—To correct 10.1, the words “by centering the specimen” were added to the fourth sentence editorially in June 2006.
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 C99 Test Method for Modulus of Rupture of Dimension
Stone
1.1 These test methods cover determination of the breaking
C119 Terminology Relating to Dimension Stone
load, modulus of rupture and modulus of elasticity of slate by
means of flexure tests.
3. Terminology
1.2 This standard does not purport to address all of the
3.1 Definitions—All definitions are in accordance with Ter-
safety concerns, if any, associated with its use. It is the
minologyC119.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 These test methods are useful in indicating the differ-
2. Referenced Documents ences in flexure (breaking load, modulus of rupture, modulus
2 of elasticity) between various slates. These test methods also
2.1 ASTM Standards:
provide one element in the comparison of slates.
5. Sampling
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These test methods are under the jurisdiction of ASTM Committee C18 on
5.1 Select the sample to represent a true average of the type
Dimension Stone and are the direct responsibility of Subcommittee C18.01 on Test
or grade of stone under consideration and of the quality
Methods.
supplied to the market under the type designation to be tested.
Current edition approved March 1, 2006. Published March 2006. Originally
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approved in 1925. Last previous edition approved in 2005 as C 120 – 05 .
The sample may be selected by the purchaser or his authorized
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
representativefromthequarriedstoneortakenfromthenatural
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ledge and shall be of adequate size to permit the preparation of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the desired number of test specimens. When perceptible
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C120–06
variations occur, the purchaser may select as many samples as edges coincide with the marks on the specimen by centering
are necessary for determining the variations in flexure (break- the specimen under the loading edge and moving the support-
ing load, modulus of rupture, modulus of elasticity). ing edges under the span marks. Apply loads at rates not
exceeding 1000 lbf (4448 N)/min until failure, and record the
MODULUS OF RUPTURE
breaking load to the nearest 5 lbf (22.2 N).
6. Test Specimens NOTE 1—When all three knife edges are of the rocker type, care must
be taken to adjust all three until the top face of the specimen is horizontal
6.1 Structural or Electrical Slate—Six representative speci-
when loaded.
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mens, 12 by 1 ⁄2 by 1 in. (305 by 38.1 by 25.4 mm) in size,
of the particular slate under consideration shall be tested.
11. Calculation - Structural or Electrical Slate
6.2 Roofing Slate—At least ten specim
...
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