ASTM C120-05e1

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Designation:C120–05
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—In 5.2, “6 specimens” was corrected to “10 specimens” editorially in May 2005.
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.
In the quarrying of slate, blasting is frequently resorted to, and for this reason certain portions of
the material may have been unduly strained. Low or erratic strength results on some of the test
specimens should be regarded in the light of defective material.
1. Scope 4. Significance and Use
1.1 These test methods cover determination of the modulus 4.1 These test methods are useful in indicating the differ-
of rupture and modulus of elasticity of slate by means of ences in flexure (modulus of rupture, modulus of elasticity)
flexure tests. between various slates. These test methods also provide one
1.2 This standard does not purport to address all of the element in the comparison of slates.
safety concerns, if any, associated with its use. It is the
MODULUS OF RUPTURE
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Test Specimens
bility of regulatory limitations prior to use.
5.1 Structural or Electrical Slate—Six representative speci-
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mens, 12 by 1 ⁄2 by 1 in. (305 by 38.1 by 25.4 mm) in size,
2. Referenced Documents
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of the particular slate under consideration shall be tested.
2.1 ASTM Standards:
5.2 Roofing Slate—At least ten specimens 4 in. (101.6 mm)
C99 Test Method for Modulus of Rupture of Dimension
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in width, 4 in. or more in length, and of thickness ⁄16 to ⁄4 in.
Stone
(4.8 to 6.4 mm).
C119 Terminology Relating to Dimension Stone
6. Preparation of Specimens
3. Terminology
6.1 Structural or Electrical Slate—Split the slate for the test
3.1 Definitions—All definitions are in accordance with Ter-
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to a thickness of approximately 1 ⁄4 in. (31.8 mm) and then saw
minologyC119.
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into strips 12 in. (304.8 mm) in length by 1 ⁄2 in. (38.1 mm) in
width. Cut half of these with the length parallel to the grain and
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These test methods are under the jurisdiction of ASTM Committee C18 on
half with the length perpendicular to the grain. Plane or rub
Dimension Stone and are the direct responsibility of Subcommittee C18.01 on Test
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downthe12by1 ⁄2-in.(304.8by38.1-mm)facestoathickness
Methods.
Current edition approved April 1, 2005. Published May 2005. Originally of approximately 1 in. (25.4 mm), taking care to have the
approved in 1925. Last previous edition approved in 2000 as C 120 – 00.
finished surfaces as nearly parallel as practicable.
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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.
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C120–05
6.2 Roofing Slate—Cut one 4 by 4-in. (101.6 by 101.6-mm) thicknesses shall be the breaking load and thickness of the
specimen, of the thickness of the slate, from each of ten sample. All determinations shall be reported as information.
shingles. The saw should be a wet cut saw capable of making
acleancutwithnolaceratededges.Cutnopartofthespecimen MODULUS OF ELASTICITY
nearer than 1 in. (25.4 mm) to a sheared edge or a nail hole.
Mark the direction of the length of the shingle on each
12. Test Specimens
specimen, and do not resurface the split faces.
12.1 The modulus of elasticity may be determined in
conjunction with the modulus of rupture test. For this test on
7. Conditioning
roofing slate it will be desirable to use a specimen 8 in. (203.2
7.1 Dry the specimens for
...