ASTM C596-96e1
(Test Method)Standard Test Method for Drying Shrinkage of Mortar Containing Hydraulic Cement
Standard Test Method for Drying Shrinkage of Mortar Containing Hydraulic Cement
SCOPE
1.1 This test method determines of the change in length on drying of mortar bars containing hydraulic cement and graded standard sand.
1.2 The values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only.
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. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure).
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e1
Designation: C 596 – 96
Standard Test Method for
Drying Shrinkage of Mortar Containing Hydraulic Cement
This standard is issued under the fixed designation C 596; 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—Paragraph 11.1.3 was editorially reinserted December 2000.
1. Scope any factor other than externally applied forces under stated
conditions of temperature, relative humidity and evaporation
1.1 This test method covers the determination of the change
rate in the environment; the term includes the net effect of a
in length on drying of mortar bars containing hydraulic cement
variety of phenomena tending to bring about both increases and
and graded standard sand.
decreases in length during the period in which the test
1.2 The values stated in SI units are to be regarded as the
specimens under consideration are stored in the environment
standard. Values given in parentheses are for information only.
and in which a number of processes, including hydration of the
1.3 This standard does not purport to address all of the
cement, are taking place at a variety of rates.
safety concerns, if any, associated with its use. It is the
3.2 Other terms used in this test method are defined in
responsibility of the user of this standard to establish appro-
Terminology C 219.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents 4.1 This test method establishes a selected set of conditions
of temperature, relative humidity and rate of evaporation of the
2.1 ASTM Standards:
environment to which a mortar specimen of stated composition
C 109/C109M Test Method for Compressive Strength of
shall be subjected for a specified period of time during which
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
2 its change in length is determined and designated “drying
Specimens)
shrinkage.”
C 157 Test Method for Length Change of Hardened Hy-
3 4.2 The drying shrinkage of mortar as determined by this
draulic Cement Mortar and Concrete
test method has a linear relation to the drying shrinkage of
C 219 Terminology Relating to Hydraulic Cement
concrete made with the same cement and exposed to the same
C 305 Practice for Mechanical Mixing of Hydraulic Cement
drying conditions. Hence this test method may be used when
Pastes and Mortars of Plastic Consistency
it is desired to develop data on the effect of a hydraulic cement
C 490 Practice for Use of Apparatus for the Determination
on the drying shrinkage of concrete made with that cement.
of Length Change of Hardened Cement Paste, Mortar, and
Concrete
5. Apparatus
C 511 Specification for Moist Cabinets, Moist Rooms, and
5.1 Weighing Devices and Weights—Weighing devices and
Water Storage Tanks Used in the Testing of Hydraulic
2 weights used in determining the mass of materials for mortar
Cements and Concretes
2 mixtures shall conform to the requirements of Specification
C 778 Specification for Standard Sand
C 1005.
C 1005 Specification for Weights and Weighing Devices for
2 5.2 Glass Graduates—Glass graduates of suitable capaci-
Use in the Physical Testing of Hydraulic Cements
ties shall conform to the requirements of Specification C 490.
E 177 Practice for Use of the Terms Precision and Bias in
4 5.3 Molds—Molds for test specimens shall provide for 25
ASTM Test Methods
3. Terminology
Data pertaining to the relation of the drying shrinkage of mortar test specimens
3.1 The term “drying shrinkage” is defined as the decrease
and of the drying shrinkage of concrete test specimens as affected by the cement
under specified laboratory test conditions, may be found in RR/120:C-1, available
in length of the test specimen, where the decrease is caused by
from ASTM Headquarters; in a report of the California Division of Highways.
“Significance of the Test for Contraction of Mortar in Air with Respect to
This test method is under the jurisdiction of ASTM Committee C01 on Cement Performance of Cements in Concrete,” Oct. 18, 1961; and in the paper by Mardulier,
F. J., Schneider, A. M., and Stockett, A. L., “An Analysis of Drying Shrinkage. Data
and is the direct responsibility of Subcommittee C01.31 on Volume Change.
for Portland Cement Mortar and Concrete,” Journal of Materials, JMLSA, Am. Soc.
Current edition approved July 10, 1996. Published September 1996. Originally
published as C 596 – 67 T. Last previous edition C 596 – 89. Testing Mats., Vol 2, No. 4, 1967, pp. 829–842. A relevant paper by H. T. Arni
Annual Book of ASTM Standards, Vol 04.01. entitled “The Significance of the Correlation Coefficient for Analyzing Engineering
Annual Book of ASTM Standards, Vol 04.02. Data” was published in Materials Research and Standards, MTRSA, Am. Soc.
Annual Book of ASTM Standards, Vol 14.02. Testing Mats., Vol. 11, No. 5, 1971, pp. 16–19.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 596
by 25 by 285-mm or 1 by 1 by 11 ⁄4-in. prisms having an 11.1.2 Remove the specimens from the molds and cure in
effective gage length of 250 mm or 10 in. respectively and shall water for 48 h. If the specimens have been moist cured in the
conform to the requirements of Specification C 490. mold for 48 h, cure in water for 24 h.
5.4 Trowel—The trowel shall have a straight-edged steel 11.1.3 At the age of 72 6 ⁄2 h, remove the specimens from
blade 100 to 150 mm (4 to 6 in.) in length. water, wipe with damp cloth and immediately obtain a length
5.5 Tamper—The tamper shall conform to the requirements comparator reading for each specimen. Then place the speci-
of Test Method C 157. mens in air storage for 25 days. Obtain a length comparator
5.6 Demolding Apparatus—The demolding apparatus shall reading for each specimen after 4, 11, 18, and 25 days of air
conform to the requirements of Test Method C 157. storage.
5.7 Length Comparator—The length comparator shall con-
12. Calculation
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