ASTM C1148-92a(2014)
(Test Method)Standard Test Method for Measuring the Drying Shrinkage of Masonry Mortar (Withdrawn 2019)
Standard Test Method for Measuring the Drying Shrinkage of Masonry Mortar (Withdrawn 2019)
SIGNIFICANCE AND USE
3.1 The drying shrinkage of mortar as determined by this test method is a measure of the decrease in length of test specimens under controlled drying conditions, after an initial period of moist curing.
3.2 Since test specimens are not completely unrestrained during the initial period of moist curing, measurements of drying shrinkage by this test method are most useful for comparative purposes rather than as absolute values.
3.3 The drying shrinkage of unrestrained laboratory tested mortar samples is different from that experienced in a masonry wall where influences include restraint, masonry unit absorption, ambient temperature and humidity, thickness of joint, length of continuous wall, etc.
SCOPE
1.1 This test method covers the measurement of unrestrained drying shrinkage of masonry mortars.
1.2 This test method is applicable to Specification C270 Type N, Type S, and Type M mortars under the property or proportion specifications. Due to the tendency to damage lower strength specimens during demolding, it is not applicable to lower strength mortars, such as Type O mortars.
1.3 This test method is intended for research purposes only.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
1.5 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.
WITHDRAWN RATIONALE
This test method covers the measurement of unrestrained drying shrinkage of masonry mortars.
Formerly under the jurisdiction of Committee C12 on Mortars and Grouts for Unit Masonry, this test method was withdrawn in May 2019. This standard is being withdrawn without replacement due to its limited use by industry. Subcommittee C12.02 on Research and Methods of Test and the task group suggested better alternative methods are being used in the industry outside of ASTM. The task group agreed withdrawal was the best option for the Standard.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C1148 − 92a (Reapproved 2014)
Standard Test Method for
Measuring the Drying Shrinkage of Masonry Mortar
This standard is issued under the fixed designation C1148; 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 C305 Practice for Mechanical Mixing of Hydraulic Cement
Pastes and Mortars of Plastic Consistency
1.1 This test method covers the measurement of unre-
C490 Practice for Use ofApparatus for the Determination of
strained drying shrinkage of masonry mortars.
Length Change of Hardened Cement Paste, Mortar, and
1.2 This test method is applicable to Specification C270
Concrete
Type N, Type S, and Type M mortars under the property or
C511 Specification for Mixing Rooms, Moist Cabinets,
proportion specifications. Due to the tendency to damage lower
Moist Rooms, and Water Storage Tanks Used in the
strength specimens during demolding, it is not applicable to
Testing of Hydraulic Cements and Concretes
lower strength mortars, such as Type O mortars.
C778 Specification for Standard Sand
1.3 This test method is intended for research purposes only.
1.4 The values stated in SI units are to be regarded as 3. Significance and Use
standard. The values given in parentheses are mathematical
3.1 The drying shrinkage of mortar as determined by this
conversions to inch-pound units that are provided for informa-
test method is a measure of the decrease in length of test
tion only and are not considered standard.
specimens under controlled drying conditions, after an initial
1.5 This standard does not purport to address all of the
period of moist curing.
safety concerns, if any, associated with its use. It is the
3.2 Since test specimens are not completely unrestrained
responsibility of the user of this standard to establish appro-
during the initial period of moist curing, measurements of
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. drying shrinkage by this test method are most useful for
1.6 This international standard was developed in accor- comparative purposes rather than as absolute values.
dance with internationally recognized principles on standard-
3.3 The drying shrinkage of unrestrained laboratory tested
ization established in the Decision on Principles for the
mortar samples is different from that experienced in a masonry
Development of International Standards, Guides and Recom-
wall where influences include restraint, masonry unit
mendations issued by the World Trade Organization Technical
absorption, ambient temperature and humidity, thickness of
Barriers to Trade (TBT) Committee.
joint, length of continuous wall, etc.
2. Referenced Documents
2 4. Apparatus
2.1 ASTM Standards:
C109/C109M Test Method for Compressive Strength of
4.1 Scales and Weights, Glass Graduates, and Length
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
Comparator, conforming to requirements of Specification
Specimens)
C490.
C157/C157M Test Method for Length Change of Hardened
4.2 Molds (for test specimens), providing for 25 by 25 by
Hydraulic-Cement Mortar and Concrete
285-mm (1 by 1 by 11.25-in.) prisms having an effective gage
C270 Specification for Mortar for Unit Masonry
length of 250 mm (10 in.), and conforming to the requirements
of Specification C490.
This test method is under the jurisdiction ofASTM Committee C12 on Mortars
and Grouts for Unit Masonry and is the direct responsibility of Subcommittee
4.3 Studs, conforming to the requirements of Specification
C12.02 on Research and Methods of Test.
C490.
Current edition approved Dec. 15, 2014. Published December 2014. Originally
approved in 1990. Last previous edition approved in 2008 as C1148 – 92a (2008).
4.4 Tamper and Demolding Apparatus, conforming to re-
DOI: 10.1520/C1148-92AR14.
2 quirements of Test Method C157/C157M.
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
4.5 Trowel, having a straight edged steel blade 100 to 150
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. mm (4 to 6 in.) in length.
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C1148 − 92a (2014)
5. Temperature and Humidity 8. Procedure
8.1 Measurement—Remove the specimens from the moist
5.1 Molding Room—The temperature of the molding room,
storage at the age of 72 6 ⁄2 h, wipe with a damp cloth, and
drymaterials,mixingwater,andtherelativehumidityoftheair
immediately measure their length with a length comparator
in the molding room shall conform to the requirements of
meeting the requirements of Specification C490.
Specification C490.
NOTE 1—The initial measurement of specimen length may be taken
...
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