ASTM C1352/C1352M-21

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: C1352/C1352M − 15 C1352/C1352M − 21
Standard Test Method for
Flexural Modulus of Elasticity of Dimension Stone
This standard is issued under the fixed designation C1352/C1352M; 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 procedure for determining the flexural modulus of elasticity of stone by using a simple beam with
quarter-point loading.
1.2 Stone tests may be made with load applied perpendicular to the bedding plane or rift and with load applied parallel to the
bedding plane or rift.
1.3 Stone tests may be made for wet and dry specimen conditions.
1.4 The specifier of the test shall determine which conditions shall be used.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.6 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C119 Terminology Relating to Dimension Stone
C880 Test Method for Flexural Strength of Dimension Stone
C1799 Guide to Dimension Stone Test Specimen Sampling and Preparation
E4 Practices for Force Calibration and Verification of Testing Machines
3. Terminology
3.1 Definition—For definitions of terms used in this test method, refer to Terminology C119.
This test method is under the jurisdiction of ASTM Committee C18 on Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test Methods.
Current edition approved May 1, 2015Sept. 1, 2021. Published July 2015October 2021. Originally approved in 1996. Last previous edition approved in 20092015 as
C1352C1352/C1352M–09.–15. DOI: 10.1520/C1352_C1352M-15.10.1520/C1352_C1352M-21.
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
C1352/C1352M − 21
3.2 Definitions of Terms Specific to This Standard:
3.2.1 modulus of elasticity, n—stress per unit strain, also known as Young’s Modulus.
4. Significance and Use
4.1 This test method is useful for providing engineering values for stress and deflection analysis of stone panels. It is also useful
in indicating the differences in flexural modulus of elasticity between various dimension stones and stones of the same type in
different loading directions (parallel and perpendicular to rift or bedding planes).
5. Apparatus
5.1 Testing Machine (see Fig. 1), conforming to the requirements of the applicable sections of Practices E4. The quarter-point
loading method shall be used in making flexure tests of stone employing bearing blocks that will ensure that forces applied to the
beam will be vertical only and applied without eccentricity. The apparatus should be capable of maintaining the span length and
distances between load-applying blocks and support blocks constant within 60.05 in. [61 mm]. The load should be capable of
being applied at a uniform rate and in such a manner as to avoid shock.
5.2 Deflection Gages, capable of reading to 0.0001 in. [0.002 mm] shall be used to measure mid-span deflections at the two free
edges and support deflections at each end.
6. Test Specimens
6.1 The test specimens shall measure 4 in. [100 mm] wide by 1.25 in. [30 mm] thick by 15 in. [350 mm] long with a span as tested
of 12.5 in. [300 mm]. The sides of the specimens shall be at right angles with the top and bottom. The specimens shall have a fine
abrasive finish on the planes perpendicular to the load and a fine saw finish on the other four planes. The dimensions of the
specimen shall be measured and recorded to the nearest 0.01 in. [0.1 mm]. A minimum of five specimens shall be tested for each
condition of test. The average value calculated from plots of the test results is reported as the flexural modulus of elasticity for
that condition.
6.2 Where the job thickness has been set (the thickness of the stone panels for the project has been established), it is often
requested to perform flexural modulus of elasticity tests at the job thickness. The following shall govern the specimen size where
it is requested to test at the job thickness, and the job thickness is other than 1.25 in. [30 mm]. The span as tested shall be ten times
the thickness. The specimen lengths shall be not less than 2 in. [50 mm] and not more than 4 in. [100 mm] greater than the span
as tested. Where the thickness is less than 2.67 in. [70 mm], the width of the specimen shall be 4 in. [100 mm]. Where the thickness
is greater than 2.67 in. [70 mm] the width shall be 1.5 times the thickness. Where the thickness is other than 1.25 in. [30 mm] and
the specimen size is in accordance with the job thickness criteria noted in the foregoing, the average value of the test results for
each condition shall be reported as the flexural modulus of elasticity of the stone at the job thickness for that condition. All other
requirements shall be in accordance with 6.1.
FIG. 1 Diagrammatic View of a Suitable Apparatus for Flexural Modulus of Elasticity of Stone Test
C1352/C1352M − 21
6.3 Where the job surface finish has been set (the architectural finish on the panels for the project has been established), it is often
requested to perform flexural modulus of elasticity tests on specimens with the finish the same as on the job. The following shall
govern when it is requested to test at the job surface finish. The specimens shall have a finish on one plane perpendicular to the
load in accordance with the finish specified for the job. Unless there are data to the contrary, the positioning of the specimen shall
be with the finished face in flexural tension. The average value of the test results for each condition shall be reported as the flexural
modulus of elasticity of the stone at the job surface finish for that condition. All other requirements shall be in accordance with
6.1 and 6.2.
6.4 Where the specimens conform to the requirements of 6.2 and 6.3, the average value calculated from plots of the test results
for each condition shall be reported as the flexural modulus of elasticity of the stone at the job thickness and surface finish for that
condition.
NOTE 1—Refer to Guide C1799 for additional infor
...