ASTM C426-23
(Test Method)Standard Test Method for Linear Drying Shrinkage of Concrete Masonry Units
Standard Test Method for Linear Drying Shrinkage of Concrete Masonry Units
SIGNIFICANCE AND USE
4.1 This test method is intended to evaluate the drying shrinkage characteristics of a given unit. The results of this laboratory method are considered in determining concrete masonry crack control provisions.
Note 1: The testing laboratory performing this test method should be evaluated in accordance with Practice C1093.
SCOPE
1.1 This test method covers a routine standardized procedure for determining the linear drying shrinkage of concrete masonry units or related concrete units under specified accelerated drying conditions.
1.2 The text of this test method 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.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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
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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: C426 − 23
Standard Test Method for
1
Linear Drying Shrinkage of Concrete Masonry Units
This standard is issued under the fixed designation C426; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* C1232 Terminology for Masonry
2.2 ANSI Standard:
1.1 This test method covers a routine standardized proce-
3
B94.11M—1993 Twist Drills
dure for determining the linear drying shrinkage of concrete
masonry units or related concrete units under specified accel-
3. Terminology
erated drying conditions.
3.1 Terminology defined in Terminology C1232 shall apply
1.2 The text of this test method references notes and
for this test method.
footnotes that provide explanatory material. These notes and
footnotes (excluding those in tables and figures) shall not be
3.2 Definitions of Terms Specific to This Standard:
considered as requirements of the standard.
3.2.1 linear drying shrinkage, n—in this test method, the
change in linear dimension of the test specimen due to drying
1.3 The values stated in inch-pound units are to be regarded
from a saturated condition to an equilibrium weight and length
as standard. The values given in parentheses are mathematical
under specified accelerated drying conditions.
conversions to SI units that are provided for information only
and are not considered standard.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 This test method is intended to evaluate the drying
safety concerns, if any, associated with its use. It is the
shrinkage characteristics of a given unit. The results of this
responsibility of the user of this standard to establish appro-
laboratory method are considered in determining concrete
priate safety, health, and environmental practices and deter-
masonry crack control provisions.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
NOTE 1—The testing laboratory performing this test method should be
dance with internationally recognized principles on standard- evaluated in accordance with Practice C1093.
ization established in the Decision on Principles for the
5. Apparatus
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 Strain Gauge—The instruments for measuring linear
Barriers to Trade (TBT) Committee.
drying shrinkage shall be so designed as to permit or provide
the conditions described in 5.1.1 through 5.1.5.
2. Referenced Documents
NOTE 2—Strain gauges may be obtained with various gauge lengths.
2
2.1 ASTM Standards:
The 10-in. (254-mm) gauge length is recommended for use with regular
C490/C490M Practice for Use of Apparatus for the Deter-
concrete masonry units, however, particular sizes of products may require
other lengths. The length of the shrinkage specimen shall not be less than
mination of Length Change of Hardened Cement Paste,
required for a minimum gauge length (distance between gauge plugs) of
Mortar, and Concrete
6 in. (152.4 mm).
C1093 Practice for Accreditation of Testing Agencies for
5.1.1 A means of positive contact with the specimen that
Masonry
will ensure reproducible measurements of length.
5.1.2 Means for precise measurement, consisting of a dial
1
This test method is under the jurisdiction of ASTM Committee C15 on
micrometer or other measuring device graduated to read in
Manufactured Masonry Units and is the direct responsibility of Subcommittee
0.0001-in. (0.0025-mm) units, and accurate within 0.0001 in.
C15.03 on Concrete Masonry Units and Related Units.
Current edition approved June 1, 2023. Published June 2023. Originally (0.0025 mm) in any 0.0010-in. (0.025-mm) range, and within
approved in 1958. Last previous edition approved in 2022 as C426 – 22. DOI:
0.0002 in. (0.0050-mm) in any 0.0100-in. (0.254-mm) range.
10.1520/C0426-23.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Dr
...
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: C426 − 22 C426 − 23
Standard Test Method for
1
Linear Drying Shrinkage of Concrete Masonry Units
This standard is issued under the fixed designation C426; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers a routine standardized procedure for determining the linear drying shrinkage of concrete masonry units
or related concrete units under specified accelerated drying conditions.
1.2 The text of this test method 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.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered 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:
C490C490/C490M Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar,
and Concrete
C1093 Practice for Accreditation of Testing Agencies for Masonry
C1232 Terminology for Masonry
2.2 ANSI Standard:
3
B94.11M—1993 Twist Drills
3. Terminology
3.1 Terminology defined in Terminology C1232 shall apply for this test method.
1
This test method is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.03 on Concrete
Masonry Units and Related Units.
Current edition approved June 1, 2022June 1, 2023. Published July 2022June 2023. Originally approved in 1958. Last previous edition approved in 20162022 as
C426 – 16.C426 – 22. DOI: 10.1520/C0426-22.10.1520/C0426-23.
2
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*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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C426 − 23
3.2 Definitions of Terms Specific to This Standard:
3.2.1 linear drying shrinkage, n—in this test method, the change in linear dimension of the test specimen due to drying from a
saturated condition to an equilibrium weight and length under specified accelerated drying conditions.
4. Significance and Use
4.1 This test method is intended to evaluate the drying shrinkage characteristics of a given unit. The results of this laboratory
method are considered in determining concrete masonry crack control provisions.
NOTE 1—The testing laboratory performing this test method should be evaluated in accordance with Practice C1093.
5. Apparatus
5.1 Strain Gauge—The instruments for measuring linear drying shrinkage shall be so designed as to permit or provide the
conditions described in 5.1.1 through 5.1.5.
NOTE 2—Strain gauges may be obtained with various gauge lengths. The 10-in. (254-mm) gauge length is recommended for use with regular concrete
masonry units, however, particular sizes of products may require other lengths. The length of the shrinkage specimen shall not be less than required for
a minimum gauge length (distance between gauge plugs) of 6 in. (152.4 mm).
5.1.1 A means of positive contact with the specimen that will ensure reproducible measurement
...
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