ASTM C1148-92a(2002)

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Designation:C1148–92a (Reapproved 2002)
Standard Test Method for
Measuring the Drying Shrinkage of Masonry Mortar
This standard is issued under the fixed designation C 1148; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 778 Specification for Standard Sand
1.1 This test method covers the measurement of unre-
3. Significance and Use
strained drying shrinkage of masonry mortars.
3.1 The drying shrinkage of mortar as determined by this
1.2 This test method is applicable to Specification C 270
test method is a measure of the decrease in length of test
Type N, Type S, and Type M mortars under the property or
specimens under controlled drying conditions, after an initial
proportion specifications. Due to the tendency to damage lower
period of moist curing.
strength specimens during demolding, it is not applicable to
3.2 Since test specimens are not completely unrestrained
lower strength mortars, such as Type O mortars.
during the initial period of moist curing, measurements of
1.3 This test method is intended for research purposes only.
drying shrinkage by this test method are most useful for
1.4 The values stated in SI units are to be regarded as the
comparative purposes rather than as absolute values.
standard. The values in parentheses are provided for informa-
3.3 The drying shrinkage of unrestrained laboratory tested
tion only.
mortar samples is different from that experienced in a masonry
1.5 This standard does not purport to address all of the
wall where influences include restraint, masonry unit absorp-
safety concerns, if any, associated with its use. It is the
tion, ambient temperature and humidity, thickness of joint,
responsibility of the user of this standard to establish appro-
length of continuous wall, etc.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Apparatus
2. Referenced Documents 4.1 Scales and Weights, Glass Graduates, and Length Com-
parator, conforming to requirements of Specification C 490.
2.1 ASTM Standards:
4.2 Molds (for test specimens), providing for 25 by 25 by
C 109 Test Method for Compressive Strength of Hydraulic
2 285-mm (1 by 1 by 11.25-in.) prisms having an effective gage
Cement Mortars (Using 2-in. or 50-mm Cube Specimens)
length of 250 mm (10 in.), and conforming to the requirements
C 157 Test Method for Length Change of Hardened Hy-
3 of Specification C 490.
draulic Cement Mortar and Concrete
4 4.3 Studs, conforming to the requirements of Specification
C 270 Specification for Mortar for Unit Masonry
C 490.
C 305 PracticeforMechanicalMixingofHydraulicCement
2 4.4 Tamper and Demolding Apparatus, conforming to re-
Pastes and Mortar of Plastic Consistency
quirements of Test Method C 157.
C 490 Practice for Use of Apparatus for the Determination
4.5 Trowel, having a straight edged steel blade 100 to 150
of Length Change of Hardened Cement Paste, Mortar, and
2 mm (4 to 6 in.) in length.
Concrete
C 511 Specification for Moist Cabinets, Moist Rooms, and
5. Temperature and Humidity
Water Storage Tanks Used in the Testing of Hydraulic
2 5.1 Molding Room—The temperature of the molding room,
Cements and Concretes
dry materials, mixing water, and the relative humidity of the air
in the molding room shall conform to the requirements of
Specification C 490.
This test method is under the jurisdiction ofASTM Committee C12 on Mortars
5.2 Moist Storage Facility—The temperature and humidity
for Unit Masonry and is the direct responsibility of Subcommittee C12.02 on
of the air in the moist storage facility shall conform to the
Research and Methods of Test.
Current edition approved May 21, 1992. Published July 1992. Originally
requirements of Specification C 511.
published as C 1148 – 90. Last previous edition C 1148 – 92.
5.3 Drying Room and Controls—The drying room and
Annual Book of ASTM Standards, Vol 04.01.
controls shall conform to the requirements of Test Method
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.05. C 157.
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C1148–92a (2002)
6. Test Specimens 8.1.1 Place specimens in drying room conforming to re-
quirements of Test Method C 157 with a clearance of at least
6.1 Number of Test Specimens:
25 mm (1 in.) on al
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