ASTM C490-00a

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Designation: C 490 – 00a
Standard Practice for
Use of Apparatus for the Determination of Length Change of
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Hardened Cement Paste, Mortar, and Concrete
This standard is issued under the fixed designation C 490; 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 interpretation of results, and precision and bias are left to be
dealt with in specific test methods.
1.1 This practice covers the requirements for the apparatus
and equipment used to prepare specimens for the determination
5. Apparatus
of length change in hardened cement paste, mortar, and
5.1 Reference Masses and Devices for Determining Mass
concrete, the apparatus and equipment used for the determina-
and Volume, shall conform to the requirements of Specification
tion of these length changes, and the procedures for its use.
C 1005.
1.2 Methods for the preparation and curing of test speci-
5.2 Molds, shall have either one or two compartments and
mens, conditions of testing and curing, and detailed procedures
shall be constructed as shown in Fig. 1 or Fig. 2. Molds for test
for calculating and reporting test results are contained in
specimens used in determining the length change of cement
applicable test methods.
pastes and mortars shall provide for 25 by 25 by 285-mm
1.3 The values stated in SI units or inch-pound units are to
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prisms having a 250-mm gage length, or for 1 by 1 by 11 ⁄4 –in.
be regarded as standard. The values in each system may not be
prisms having a 10–in. gage length. Molds for test specimens
exact equivalents; therefore, each system shall be used inde-
used in the length change of concretes shall provide for prisms
pendently of the other. Combining values from the two systems
of the desired cross section having a 10-in. or 250-mm gage
may result in nonconformance with the standard.
length. In some routine tests, 25 by 25 by 160-mm specimens
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2. Referenced Documents with a gage length of 125 mm, or 1 by 1 by 6 ⁄4 –in. specimens
with a gage length of 5-in. are permitted, but in case of dispute,
2.1 ASTM Standards:
results obtained with specimens of 250-mm [10-in]. gage
C 511 Specification for Moist Cabinets, Moist Rooms, and
length shall govern.
Water Storage Tanks Used in the Testing of Hydraulic
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5.2.1 The gage length shall be considered as the nominal
Cements and Concretes
length between the innermost ends of the gage studs. The parts
C 1005 Specification for Reference Masses and Devices for
of the molds shall be tight fitting and firmly held together when
Determining Mass and Volume for Use in the Physical
2 assembled, and their surfaces shall be smooth and free of pits.
Testing of Hydraulic Cements
The molds shall be made of steel or other hard metal not
3. Terminology readily attacked by the cement paste, mortar, or concrete. The
sides of the molds shall be sufficiently rigid to prevent
3.1 length change—an increase or decrease in the linear
spreading or warping. For the molds shown in Fig. 1, the
dimension of a test specimen, measured along the longitudinal
tolerance on dimension A is 60.7 mm. For the molds shown in
axis, due to causes other than applied load.
Fig. 2, the tolerance on dimension A is 60.03 in.
4. Significance and Use
5.2.2 Each end plate of the mold shall be equipped to hold
properly in place, during the setting period, one of the gage
4.1 This practice is intended to provide standard require-
studs shown in Fig. 1 or Fig. 2. The gage studs shall be of
ments for apparatus common to many test methods used in
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American Iron and Steel Institute (AISI) Type 316 stainless
connection with cement and concrete and standardized proce-
steel or other corrosion-resistant metal of similar hardness.
dures for its use. The detailed requirements as to materials,
Gage studs of Invar or similar metal shall be used when
mixtures, specimens, conditioning of specimens, number of
specimens are tested at widely different temperatures. To
specimens, ages at which measurements are to be made,
prevent restraint of the gage studs before demolding of the
specimen, the device for holding the gage studs in position
shall be so arranged that, if necessary, it can be partially or
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This practice is under the jurisdiction of ASTM Committee C01 on Cement and
is the direct responsibility of Subcommittee C01.95 on Coordination of Standards.
Current edition approved Nov. 10, 2000. Published January 2001. Originally
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published as C 490 – 62. Last previous edition C 490 – 00. Details on this material are available from the American Iron and Steel Institute,
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Annual Book of ASTM Standards, Vol 04.01. 1133 15th St. N.W., Washington,
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