ASTM C1148-92a(1997)e1

NOTICE: This standard has either been superceded and replaced by a new version or discontinued. NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information. Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: C 1148 – 92a (Reapproved 1997)
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.
e NOTE—Section 12 on Keywords was added editorally in June 1997.
1. Scope Cements and Concretes
C 778 Specification for Standard Sand
1.1 This test method covers the measurement of unre-
strained drying shrinkage of masonry mortars.
3. Significance and Use
1.2 This test method is applicable to Specification C 270
3.1 The drying shrinkage of mortar as determined by this
Type N, Type S, and Type M mortars under the property or
test method is a measure of the decrease in length of test
proportion specifications. Due to the tendency to damage lower
specimens under controlled drying conditions, after an initial
strength specimens during demolding, it is not applicable to
period of moist curing.
lower strength mortars, such as Type O mortars.
3.2 Since test specimens are not completely unrestrained
1.3 This test method is intended for research purposes only.
during the initial period of moist curing, measurements of
1.4 The values stated in SI units are to be regarded as the
drying shrinkage by this test method are most useful for
standard. The values in parentheses are provided for informa-
comparative purposes rather than as absolute values.
tion only.
3.3 The drying shrinkage of unrestrained laboratory tested
1.5 This standard does not purport to address all of the
mortar samples is different from that experienced in a masonry
safety concerns, if any, associated with its use. It is the
wall where influences include restraint, masonry unit absorp-
responsibility of the user of this standard to establish appro-
tion, ambient temperature and humidity, thickness of joint,
priate safety and health practices and determine the applica-
length of continuous wall, etc.
bility of regulatory limitations prior to use.
4. Apparatus
2. Referenced Documents
4.1 Scales and Weights, Glass Graduates, and Length Com-
2.1 ASTM Standards:
parator, conforming to requirements of Specification C 490.
C 109 Test Method for Compressive Strength of Hydraulic
2 4.2 Molds (for test specimens), providing for 25 by 25 by
Cement Mortars (Using 2-in. or 50-mm Cube Specimens)
285-mm (1 by 1 by 11.25-in.) prisms having an effective gage
C 157 Test Method for Length Change of Hardened Hy-
3 length of 250 mm (10 in.), and conforming to the requirements
draulic Cement Mortar and Concrete
4 of Specification C 490.
C 270 Specification for Mortar for Unit Masonry
4.3 Studs, conforming to the requirements of Specification
C 305 Practice for Mechanical Mixing of Hydraulic Cement
2 C 490.
Pastes and Mortar of Plastic Consistency
4.4 Tamper and Demolding Apparatus, conforming to re-
C 490 Practice for Use of Apparatus for the Determination
quirements of Test Method C 157.
of Length Change of Hardened Cement Paste, Mortar, and
2 4.5 Trowel, having a straight edged steel blade 100 to 150
Concrete
mm (4 to 6 in.) in length.
C 511 Specification for Moist Cabinets, Moist Rooms, and
Water Storage Tanks Used in the Testing of Hydraulic
5. Temperature and Humidity
5.1 Molding Room—The temperature of the molding room,
This test method is under the jurisdiction of ASTM Committee C-12 on Mortars dry materials, mixing water, and the relative humidity of the air
for Unit Masonry and is the direct responsibility of Subcommittee C12.02 on
in the molding room shall conform to the requirements of
Research and Methods of Test.
Specification C 490.
Current edition approved May 21, 1992. Published July 1992. Originally
5.2 Moist Storage Facility—The temperature and humidity
published as C 1148 – 90. Last previous edition C 1148 – 92.
Annual Book of ASTM Standards, Vol 04.01.
of the air in the moist storage facility shall conform to the
Annual Book of ASTM Standards, Vol 04.02.
requirements of Specification C 511.
Annual Book of ASTM Standards, Vol 04.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued. NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information. Contact ASTM International (www.astm.org) for the latest information.
e1
C 1148 – 92a (1997)
either immediately after
...