ASTM C426-15e1
(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 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.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
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´1
Designation: C426 − 15
StandardTest 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.Anumber 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
ε NOTE—Editorially corrected 3.2.1 in February 2016.
1. Scope* 3.2 Definitions of Terms Specific to This Standard:
3.2.1 linear drying shrinkage, n—in this test method, the
1.1 This test method covers a routine standardized proce-
change in linear dimension of the test specimen due to drying
dure for determining the linear drying shrinkage of concrete
from a saturated condition to an equilibrium weight and length
masonry units or related concrete units under specified accel-
under specified accelerated drying conditions.
erated drying conditions.
1.2 The values stated in inch-pound units are to be regarded 4. Significance and Use
as standard. The values given in parentheses are mathematical
4.1 This test method is intended to evaluate the drying
conversions to SI units that are provided for information only
shrinkage characteristics of a given unit. The results of this
and are not considered standard.
laboratory method are considered in determining concrete
1.3 This standard does not purport to address all of the masonry crack control provisions.
safety concerns, if any, associated with its use. It is the
NOTE 1—The testing laboratory performing this test method should be
responsibility of the user of this standard to establish appro-
evaluated in accordance with Practice C1093.
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Strain Gauge—The instruments for measuring linear
2. Referenced Documents
drying shrinkage shall be so designed as to permit or provide
2
2.1 ASTM Standards: the conditions described in 5.1.1 through 5.1.5.
C490PracticeforUseofApparatusfortheDeterminationof
NOTE 2—Strain gauges may be obtained with various gauge lengths.
Length Change of Hardened Cement Paste, Mortar, and
The 10-in. (254-mm) gauge length is recommended for use with regular
Concrete
concrete masonry units, however, particular sizes of products may require
C1093Practice for Accreditation of Testing Agencies for other lengths. The length of the shrinkage specimen shall not be less than
required for a minimum gauge length (distance between gauge plugs) of
Masonry
6 in. (152.4 mm).
C1232Terminology of Masonry
5.1.1 A means of positive contact with the specimen that
2.2 ANSI Standard:
3
will ensure reproducible measurements of length.
B94.11M—1993 Twist Drills
5.1.2 Means for precise measurement, consisting of a dial
3. Terminology
micrometer or other measuring device graduated to read in
0.0001-in. (0.0025-mm) units, and accurate within 0.0001 in.
3.1 Terminology defined in Terminology C1232 shall apply
(0.0025 mm) in any 0.0010-in. (0.025-mm) range, and within
for this test method.
0.0002 in. (0.0050-mm) in any 0.0100-in. (0.254-mm) range.
5.1.3 Sufficient range to allow for small variations in the
1
This test method is under the jurisdiction of ASTM Committee C15 on
gauge lengths.
Manufactured Masonry Units and is the direct responsibility of Subcommittee
C15.03 on Concrete Masonry Units and Related Units.
NOTE 3—If the shrinkage reference points are set carefully to position,
Current edition approved Dec. 1, 2015. Published January 2016. Originally
a dial micrometer with a travel of 0.2 or 0.3 in. (5.1 or 7.6 mm) provides
approved in 1958. Last previous edition approved in 2010 as C426–10. DOI:
ample range in the instrument.
10.1520/C0426-15E01.
2
5.1.4 Means for checking the strain gauge at regular inter-
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
vals against a standard reference bar. The standard reference
Standards volume information, refer to the standard’s Document Summary page on
bar shall be protected from air currents by placing it inside a
the ASTM website.
3
wooden box which should be closed except when the strain
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. gauge is being checked against it.
*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
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C426 − 15
NOTE 1—Provide a
...
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.
´1
Designation: C426 − 15 C426 − 15
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
ε NOTE—Editorially corrected 3.2.1 in February 2016.
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 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.
1.3 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C490 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 of 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.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 linear drying shrinkage—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
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 Dec. 1, 2015. Published January 2016. Originally approved in 1958. Last previous edition approved in 2010 as C426 – 10. DOI:
10.1520/C0426-15.10.1520/C0426-15E01.
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
---------------------- Page: 1 ----------------------
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C426 − 15
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 measurements of length.
5.1.2 Means for precise measurement, consisting of a dial micrometer or other measuring device graduated to read in 0.0001-in.
(0.0025-mm) units, and accurate within 0.0001 in. (0.0025 mm) in any 0.0010-in. (0.025-mm) range, and within 0.0002 in.
(0.0050-mm) in any 0.0100-in. (0.254-mm) range.
5.1.3 Sufficient range to allow for small variations in the gauge lengths.
NOTE 3—If the shrinkage reference points are set carefully to position, a dial micrometer with a travel of 0.2 or 0.3 in. (5.1 or 7.6 mm) provides
...
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