ASTM C1006/C1006M-20a

Standard Test Method for Splitting Tensile Strength of Masonry Units

SIGNIFICANCE AND USE
5.1 Masonry units alone and within assemblages commonly fail in a tensile mode when loaded in compression to failure. These tensile stresses result from differences in modulus of elasticity and Poisson's ratio between the masonry unit and mortar. Additionally, the dissimilarity in behavior of the grout within cores of masonry units under load leads to tensile stresses in the units and results in a splitting failure.  
5.2 This test method produces a line load along the bed surface of the masonry unit. The compressive load applied to the unit, imposed by means of bearing rods, results in a tensile stress distributed over the height of the unit for the split length of the unit. This test method can be conducted with the rod oriented either in the longitudinal direction or in the transverse direction of the bed face. The splitting tensile strength is calculated by the equation given in 10.1.  
5.3 The test value provides an indicator of masonry-unit splitting tensile strength. Additionally, the presence of defects such as visible voids or impurities in masonry units may be revealed.  
5.4 The moisture content of the specimen will affect test results.  
5.5 The height of the specimen will affect test results.
SCOPE
1.1 This test method covers the determination of the splitting tensile strength of masonry units.  
1.2 Units—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 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

• Status: Published
• Publication Date: 30-Jun-2020
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: C15 - Manufactured Masonry Units
• Drafting Committee: C15.04 - Research

Standards Content (Sample)

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.
Designation: C1006/C1006M − 20a
Standard Test Method for
1
Splitting Tensile Strength of Masonry Units
This standard is issued under the fixed designation C1006/C1006M; 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* chine Requirements for Concrete Masonry Units, Related
Units, and Prisms
1.1 This test method covers the determination of the split-
ting tensile strength of masonry units.
3. Terminology
1.2 Units—The values stated in either SI units or inch-
3.1 Definitions:
pound units are to be regarded separately as standard. The
3.1.1 For definitions of terms used in this test method, refer
values stated in each system may not be exact equivalents;
to Terminology C1232.
therefore,eachsystemshallbeusedindependentlyoftheother.
Combining values from the two systems may result in non- 3.2 Definitions of Terms Specific to This Standard:
3.2.1 bearing rod, n—steel cylinder to concentrate the
conformance with the standard.
applied load along a single line.
1.3 The text of this standard references notes and footnotes
3.2.1.1 Discussion—The diameter of the bearing rod is
that provide explanatory material. These notes and footnotes
determined by the height of the specimen.
(excluding those in tables and figures) shall not be considered
3.2.2 compressible brace, n—tube or rod made of a non-
as requirements of the standard.
rigid material.
1.4 This standard does not purport to address all of the
3.2.2.1 Discussion—Compressible braces are used to sup-
safety concerns, if any, associated with its use. It is the
port the test assembly during the initial loading to prevent the
responsibility of the user of this standard to establish appro-
rocking of the test assembly. The compressible braces are
priate safety, health, and environmental practices and deter-
requiredtobethesamediameterorslightlysmallerindiameter
mine the applicability of regulatory limitations prior to use.
than the bearing rods to prevent interference with the test
1.5 This international standard was developed in accor-
results.
dance with internationally recognized principles on standard-
3.2.3 gross split length, n—distance along the fracture from
ization established in the Decision on Principles for the
one face of the specimen to the opposite face of the specimen.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.2.4 net split length, n—gross split length minus the length
Barriers to Trade (TBT) Committee.
of any voids along the failure plane of the bearing rods.
3.2.5 test assembly, n—the combination of the specimen
2. Referenced Documents
with a bearing rod adhered to the top and a bearing rod adhered
2
2.1 ASTM Standards:
to the bottom of the specimen.
C39/C39M Test Method for Compressive Strength of Cylin-
drical Concrete Specimens
4. Summary of Test Method
C1232 Terminology for Masonry
4.1 A test assembly is made by adhering steel bearing rods
C1552 Practice for Capping Concrete Masonry Units, Re-
to the top and bottom faces of the specimen using capping
lated Units and Masonry Prisms for Compression Testing
compound. After the capping compound has cured, the test
C1716/C1716M Specification for Compression Testing Ma-
assembly is placed in the test machine while supported by
compressible braces to prevent the test assembly from rocking.
Aload is applied to the test assembly. The compressible braces
1
This test method is under the jurisdiction of ASTM Committee C15 on
Manufactured Masonry Units and is the direct responsibility of Subcommittee are removed once the test machine holds the test assembly
C15.04 on Research.
firmly. The load is continued to be applied until specimen
Current edition approved July 1, 2020. Published July 2020. Originally approved
failure.
in 1984. Last previous edition approved in 2020 as C1006 – 20. DOI: 10.1520/
C1006_C1006M-20A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Significance and Use
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.1 Masonry units alone and within assemblages commonly
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. fail in a tensile mode when loaded in compression to failure.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United Sta
...

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: C1006/C1006M − 20 C1006/C1006M − 20a
Standard Test Method for
1
Splitting Tensile Strength of Masonry Units
This standard is issued under the fixed designation C1006/C1006M; 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 determination of the splitting tensile strength of masonry units.
1.2 Units—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 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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
2.1 ASTM Standards:
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C1232 Terminology for Masonry
C1552 Practice for Capping Concrete Masonry Units, Related Units and Masonry Prisms for Compression Testing
C1716/C1716M Specification for Compression Testing Machine Requirements for Concrete Masonry Units, Related Units, and
Prisms
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C1232.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bearing rod, n—steel cylinder to concentrate the applied load along a single line.
1
This test method is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.04 on Research.
Current edition approved Jan. 1, 2020July 1, 2020. Published January 2020July 2020. Originally approved in 1984. Last previous edition approved in 20192020 as
C1006 – 19.C1006 – 20. DOI: 10.1520/C1006_C1006M-20.10.1520/C1006_C1006M-20A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3.2.1.1 Discussion—
The diameter of the bearing rod is determined by the height of the specimen.
3.2.2 compressible brace, n—tube or rod made of a non-rigid material.
3.2.2.1 Discussion—
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1006/C1006M − 20a
Compressible braces are used to support the test assembly during the initial loading to prevent the rocking of the test assembly.
The compressible braces are required to be the same diameter or slightly smaller in diameter than the bearing rods to prevent
interference with the test results.
3.2.3 gross split length, n—distance along the fracture from one face of the specimen to the opposite face of the specimen.
3.2.4 net split length, n—gross split length minus the length of any voids along the failure plane of the bearing rods.
3.2.5 test assembly, n—the combination of the specimen with a bearing rod adhered to the top and a bearing rod adhered to the
bottom of the specimen.
4. Summary of Test Method
4.1 A test assembly is made by adhering steel bearing rods to the top and bottom faces of the specimen using capping
compound. After the capping compound has cured, the test assembly is placed in the test machine while supported by compressible
braces to prevent the test assembly from rocking. A load is applied to the test assembly. The co
...