ASTM C426-10
(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
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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Designation: C426 − 10
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. Scope* 4. Significance and Use
1.1 This test method covers a routine standardized proce-
4.1 This test method is intended to evaluate the drying
dure for determining the linear drying shrinkage of concrete
shrinkage characteristics of a given unit. The results of this
masonry units or related concrete units under specified accel-
laboratory method are considered in determining concrete
erated drying conditions.
masonry crack control provisions.
1.2 The values stated in inch-pound units are to be regarded
NOTE 1—The testing laboratory performing this test method should be
as standard. The values given in parentheses are mathematical
evaluated in accordance with Practice C1093.
conversions to SI units that are provided for information only
and are not considered standard. 5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Strain Gauge—The instruments for measuring linear
safety concerns, if any, associated with its use. It is the
drying shrinkage shall be so designed as to permit or provide
responsibility of the user of this standard to establish appro-
the conditions described in 5.1.1 through 5.1.5.
priate safety and health practices and determine the applica-
NOTE 2—Strain gauges may be obtained with various gauge lengths.
bility of regulatory limitations prior to use.
The 10-in. (254-mm) gauge length is recommended for use with regular
concrete masonry units, however, particular sizes of products may require
2. Referenced Documents
other lengths. The length of the shrinkage specimen shall not be less than
2
2.1 ASTM Standards: required for a minimum gauge length (distance between gauge plugs) of
6 in. (152.4 mm).
C490PracticeforUseofApparatusfortheDeterminationof
Length Change of Hardened Cement Paste, Mortar, and
5.1.1 A means of positive contact with the specimen that
Concrete
will ensure reproducible measurements of length.
C1093Practice for Accreditation of Testing Agencies for
5.1.2 Means for precise measurement, consisting of a dial
Masonry
micrometer or other measuring device graduated to read in
2.2 ANSI Standard:
0.0001-in. (0.0025-mm) units, and accurate within 0.0001 in.
3
B94.11M—1993 Twist Drills
(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.
3. Terminology
5.1.3 Sufficient range to allow for small variations in the
3.1 Definitions:
gauge lengths.
3.1.1 linear drying shrinkage—in this test method, the
NOTE 3—If the shrinkage reference points are set carefully to position,
change in linear dimension of the test specimen due to drying
a dial micrometer with a travel of 0.2 or 0.3 in. (5.1 or 7.6 mm) provides
from a saturated condition to an equilibrium weight and length
ample range in the instrument.
under specified accelerated drying conditions.
5.1.4 Means for checking the strain gauge at regular inter-
vals against a standard reference bar. The standard reference
1
This test method is under the jurisdiction of ASTM Committee C15 on
bar shall be protected from air currents by placing it inside a
Manufactured Masonry Units and is the direct responsibility of Subcommittee
wooden box which should be closed except when the strain
C15.03 on Concrete Masonry Units and Related Units.
Current edition approved Dec. 1, 2010. Published December 2010. Originally
gauge is being checked against it.
approved in 1958. Last previous edition approved in 2007 as C426–07. DOI:
10.1520/C0426-10.
NOTE 4—A standard reference bar shall be furnished by the manufac-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
turer of the instrument.Astandard bar of ordinary steel is satisfactory, but
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
corrections must be made for variations in its length due to temperature
Standards volume information, refer to the standard’s Document Summary page on
changes. When a more nearly constant datum is desired, Invar is
the ASTM website.
preferable because of its low coefficient of thermal expansion.
3
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. 5.1.5 Convenient and rapid measurement of specimens.
*A Summary of Changes section appears at the end of this standard
Copyright
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:C426–07 Designation:C426–10
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.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 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.
1.2The values stated in inch-pound units are to be regarded as the standard.The values given in parentheses are for information
only.
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 ofApparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete
C1093 Practice for Accreditation of Testing Agencies for Masonry
2.2 ANSI Standard:
3
B94.11M—1993 Twist Drills
3. Terminology
3.1 Definition:
3.1.1 linear drying shrinkage—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 measurements of length.
5.1.2 Meansforprecisemeasurement,consistingofadialmicrometerorothermeasuringdevicegraduatedtoreadin0.0001-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.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC15onManufacturedMasonryUnitsandisthedirectresponsibilityofSubcommitteeC15.03onConcrete
Masonry Units and Related Units.
Current edition approved JuneDec. 1, 2007.2010. Published June 2007.December 2010. Originally approved in 1958. Last previous edition approved in 20062007 as
C426–067. DOI: 10.1520/C0426-107.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@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.
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C426–10
(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 ample
range in the instrument.
5.1.4 Means for checking the strain gauge at regular intervals against a standard reference bar.The standard
...
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