ASTM C99-87(2006)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C99–87(Reapproved2006)
Standard Test Method for
Modulus of Rupture of Dimension Stone
ThisstandardisissuedunderthefixeddesignationC 99;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
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.
1. Scope 6. Sampling
1.1 This test method covers the determination of the modu- 6.1 Select the sample to represent a true average of the type
lus of rupture of all types of dimension stone except slate. or grade of stone under consideration and of the quality
1.2 This standard does not purport to address all of the supplied to the market under the type designation to be tested.
safety concerns, if any, associated with its use. It is the The sample may be selected by the purchaser or his authorized
responsibility of the user of this standard to establish appro- representativefromthequarriedstoneortakenfromthenatural
priate safety and health practices and determine the applica- ledge and shall be of adequate size to permit the preparation of
bility of regulatory limitations prior to use. the desired number of test specimens. When perceptible
variations occur, the purchaser may select as many samples as
2. Referenced Documents
are necessary for determining the variations in modulus of
2.1 ASTM Standards:
rupture.
C119 Terminology Relating to Dimension Stone
7. Test Specimens
3. Terminology
7.1 The specimens shall be approximately 4 by 8 by 2 ⁄4 in.
3.1 Definitions—All definitions are in accordance with Ter- (101.6 by 203.2 by 57.2 mm) in size.They shall be sawed from
minologyC119.
the sample and finished by grinding to smooth surfaces. The 4
by 8-in. faces shall be as nearly plane and parallel as practi-
4. Significance and Use
cable. For loading perpendicular to the rift (Note 1) five
4.1 This test method is useful in indicating the differences in
specimens shall be prepared with the 4 by 8-in. faces parallel
modulus of rupture between the various dimension stones.This to the rift planes (see A in Fig. 1), and for loading parallel to
test method also provides one element in comparing stones of
the rift, five specimens shall be prepared with the 4 by 2 ⁄4-in.
the same type.
(101.6 by 57.2 mm) faces parallel to the rift (Note 2). When
tests are desired on the stone in both the wet and dry condition,
5. Apparatus
ten specimens shall be prepared for each direction of loading;
5.1 Testing Machine— The accuracy of the testing machine
that is, five for tests dry, perpendicular to the rift, five for tests
shall be within 1 % for the range from 10 to 1000 lbf (44 to
wet, perpendicular to the rift, etc.
4450 N).
NOTE 1—The term rift is used here to designate the direction in which
5.2 Knife Edges— The supports for the specimen shall be
the stone splits most easily. In stratified stones it is considered to coincide
two knife edges of the rocker type (Fig. 1) with edges at least
with the bedding or stratification. The rift direction should always be
as long as the width of the specimen. The loading knife edge
marked on the sample by the quarryman, since it often is not possible to
may be of either the rocker or rigid type.
determine it on a small block.
NOTE 2—Another condition of loading may occur in structures when
the rift planes are vertical and parallel to the length of the beam. The
This test method is under the jurisdiction of ASTM Committee C18 on
strength of the stone may be obtained for such loading by cutting the
Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test 1
specimens with the 2 ⁄4 by 8-in. (57.2 by 203.2-mm) face parallel to the
Methods.
rift. The meager data available for this condition of loading indicates that
Current edition approved April 1, 2006. Published April 2006. Originally
the strength is at least as high as when the load is applied perpendicular
approved in 1931. Last previous edition approved in 2000 as C 99 – 87(2000).
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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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C99–87 (2006)
A —Specimen in position for testing. a—Span lines.
A —Specimen for test perpendicular to the rift. b—Center lines.
A —Specimen for test parallel to the rift. c—Supporting knife edges.
(Dotted lines on A and A indicate the rift direction) d—Loading knife edge.
2 3
FIG. 1 Specimens and Preferred Type of Knife Edges for Determining the Modulus of Rupture of Building Stone
to the rift as shown by A in Fig. 1.
...