ASTM C531-00(2012)
(Test Method)Standard Test Method for Linear Shrinkage and Coefficient of Thermal Expansion of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes
Standard Test Method for Linear Shrinkage and Coefficient of Thermal Expansion of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes
SIGNIFICANCE AND USE
4.1 This test method offers a means of comparing the relative linear shrinkage and coefficient of thermal expansion.
4.1.1 The material to be tested is placed in the mold in a fluid or plastic state. As the material makes a transition to a solid state, it adheres to and captures the end studs.
4.1.2 The linear shrinkage measured is the change in length that occurs after the material is rigid enough and strong enough to move the studs.
4.2 This test method can be used for research purposes to provide information on linear changes taking place in the test materials. Other dimensional changes may occur that do not manifest themselves as changes in length.
SCOPE
1.1 This test method covers the measurement of the linear shrinkage during setting and curing and the coefficient of thermal expansion of chemical-resistant mortars, grouts, monolithic surfacings, and polymer concretes.
1.2 A bar of square cross-section is cast to a prescribed length in a mold that holds measuring studs that are captured in the ends of the finished casting.
1.2.1 The change in length after curing is measured and used to calculate shrinkage.Note 1—Shrinkage determinations should not be made on sulfur mortars, since this test method cannot truly reflect the overall linear shrinkage of a sulfur mortar.
1.2.2 The change in length at a specific elevated temperature is measured and used to calculate the coefficient of thermal expansion.
1.3 This test method is limited to materials with aggregate size of 0.25 in. (6 mm) or less.
1.4 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.
1.5 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.
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Standards Content (Sample)
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Designation: C531 − 00 (Reapproved 2012)
Standard Test Method for
Linear Shrinkage and Coefficient of Thermal Expansion of
Chemical-Resistant Mortars, Grouts, Monolithic Surfacings,
and Polymer Concretes
This standard is issued under the fixed designation C531; 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 2. Referenced Documents
1.1 This test method covers the measurement of the linear 2.1 ASTM Standards:
shrinkage during setting and curing and the coefficient of C287Specification for Chemical-Resistant Sulfur Mortar
thermalexpansionofchemical-resistantmortars,grouts,mono- C490PracticeforUseofApparatusfortheDeterminationof
lithic surfacings, and polymer concretes. Length Change of Hardened Cement Paste, Mortar, and
Concrete
1.2 A bar of square cross-section is cast to a prescribed
C904Terminology Relating to Chemical-Resistant Nonme-
lengthinamoldthatholdsmeasuringstudsthatarecapturedin
tallic Materials
the ends of the finished casting.
1.2.1 The change in length after curing is measured and
3. Terminology
used to calculate shrinkage.
3.1 Definitions—For definitions of terms used in this test
NOTE 1—Shrinkage determinations should not be made on sulfur
method, see Terminology C904.
mortars, since this test method cannot truly reflect the overall linear
shrinkage of a sulfur mortar.
4. Significance and Use
1.2.2 Thechangeinlengthataspecificelevatedtemperature
4.1 This test method offers a means of comparing the
is measured and used to calculate the coefficient of thermal
relative linear shrinkage and coefficient of thermal expansion.
expansion.
4.1.1 The material to be tested is placed in the mold in a
1.3 This test method is limited to materials with aggregate fluid or plastic state. As the material makes a transition to a
size of 0.25 in. (6 mm) or less. solid state, it adheres to and captures the end studs.
4.1.2 The linear shrinkage measured is the change in length
1.4 The values stated in inch-pound units are to be regarded
thatoccursafterthematerialisrigidenoughandstrongenough
as standard. The values given in parentheses are mathematical
to move the studs.
conversions to SI units that are provided for information only
and are not considered standard. 4.2 This test method can be used for research purposes to
provide information on linear changes taking place in the test
1.5 This standard does not purport to address all of the
materials. Other dimensional changes may occur that do not
safety concerns, if any, associated with its use. It is the
manifest themselves as changes in length.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Weighing Equipment, shall be capable of weighing
materials or specimens to 60.3% accuracy.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2012. Published September 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1963. Last previous edition approved in 2005 as C531–00 (2005). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C0531-00R12. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C531 − 00 (2012)
5.2 Equipment for Mixing, consisting of a container of 6.4.5 Measure the measuring studs with micrometers and
suitable size preferably made of corrosion-resistant metal, or a carefully adjust in the end blocks by means of the standard bar
porcelain pan, and a sturdy spatula or trowel. supplied with the mold.
6.4.6 Fill the molds with the material, taking care to
5.3 Specimen Mold, (see Practice C490) permitting the
eliminate air pockets by working the material with a spatula or
molding of bars with a metal stud embedded in each end. The
thintrowel.Levelthetopsurfacewiththespatulaandstrikeoff
barsshallbe1in.(25mm)squareby10in.(250mm)between
the excess evenly. In the case of sulfur mortars, at least three
studs when molded. A standard 10-in. (250-mm) metal bar
separate pourings shall be made.
shall be provided; this is used to space the studs.
6.4.7 After casting the specimens, remove the machine
5.4 Studs—Nickel alloy studs, which have linear coefficient
screws holding the end blocks to permit free movement of the
−6 −6
of thermal expansion of 7.2×10 per °F (4×10 per °C),
blocks.
knurled on one end and threaded on the other (for securing in
end blocks), approximately 0.8 in. (20 mm) long. Remove any 7. Conditioning
machining burrs from the flat end of the stud.
7.1 Resin and Sulfur Materials—Test specimens shall be
removed from molds only after an initial curing time deemed
5.5 Comparator—A direct-reading dial or digital microm-
suitable by the manufacturer.
eter to permit readings to 0.0001 in. (0.0025 mm).
7.2 Silica and Silicate Materials—Immediately after mold-
5.6 Micrometers, one having a range suitable for measuring
ing the specimens, cover the mold with polyethylene sheeting
the studs (0.8 in.), and one having a range suitable for
or other suitable material to prevent rapid evaporation of
measuring the standard 10-in. (254-mm) bar, both readable to
surface moisture and subsequent deformation of the specimen
0.0001 in. (0.0025 mm).
bar. Disassemble the mold (deviations in the time mortars, etc.
5.7 Constant-Temperature Oven—An oven capable of at-
are kept in the mold, are to be reported) as described in 7.1.
taining temperatures to 210°F (99°C) is required. The oven
should be capable of maintaining a set temperature constant to
8. Procedure for Linear Shrinkage
63°
...
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