ASTM C490/C490M-11e1
(Practice)Standard Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete
Standard Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete
SIGNIFICANCE AND USE
4.1 This practice is intended to provide standard requirements for apparatus common to many test methods used in connection with cement and concrete and standardized procedures for its use. The detailed requirements as to materials, mixtures, specimens, conditioning of specimens, number of specimens, ages at which measurements are to be made, interpretation of results, and precision and bias are left to be dealt with in specific test methods.
SCOPE
1.1 This practice covers the requirements for the apparatus and equipment used to prepare specimens for the determination of length change in hardened cement paste, mortar, and concrete, the apparatus and equipment used for the determination of these length changes, and the procedures for its use.
1.2 Methods for the preparation and curing of test specimens, conditions of testing and curing, and detailed procedures for calculating and reporting test results are contained in applicable test methods.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Designation: C490/C490M − 11
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 C490/C490M; 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 (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Editorial corrections were made in April 2014.
1. Scope* 4. Significance and Use
1.1 This practice covers the requirements for the apparatus
4.1 This practice is intended to provide standard require-
andequipmentusedtopreparespecimensforthedetermination ments for apparatus common to many test methods used in
of length change in hardened cement paste, mortar, and
connection with cement and concrete and standardized proce-
concrete, the apparatus and equipment used for the determina- dures for its use. The detailed requirements as to materials,
tion of these length changes, and the procedures for its use.
mixtures, specimens, conditioning of specimens, number of
specimens, ages at which measurements are to be made,
1.2 Methods for the preparation and curing of test
interpretation of results, and precision and bias are left to be
specimens, conditions of testing and curing, and detailed
dealt with in specific test methods.
procedures for calculating and reporting test results are con-
tained in applicable test methods.
5. Apparatus
1.3 The values stated in either SI units or inch-pound units
5.1 Reference Masses and Devices for Determining Mass
are to be regarded separately as standard. The values stated in
andVolume, shall conform to the requirements of Specification
each system may not be exact equivalents; therefore, each
C1005.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
5.2 Molds, shall have either one or two compartments and
with the standard.
shall be constructed as shown in Fig. 1 or Fig. 2. Molds for test
specimens used in determining the length change of cement
2. Referenced Documents
pastes and mortars shall provide for 25 by 25 by 285-mm
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prisms having a 250-mm gauge length, or for 1 by 1 by 11 ⁄4
2.1 ASTM Standards:
–in. prisms having a 10–in. gauge length. Molds for test
C511 Specification for Mixing Rooms, Moist Cabinets,
specimens used in the length change of concretes shall provide
Moist Rooms, and Water Storage Tanks Used in the
for prisms of the desired cross section having a 10-in. or
Testing of Hydraulic Cements and Concretes
250-mm gauge length. In some routine tests, 25 by 25 by
C1005 Specification for Reference Masses and Devices for
160-mm specimens with a gauge length of 125 mm, or 1 by 1
Determining Mass and Volume for Use in the Physical
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by 6 ⁄4 –in. specimens with a gauge length of 5-in. are
Testing of Hydraulic Cements
permitted, but in case of dispute, results obtained with speci-
mens of 250-mm [10-in.] gauge length shall govern.
3. Terminology
5.2.1 The gauge length shall be considered as the nominal
3.1 length change—an increase or decrease in the linear
length between the innermost ends of the gauge studs. The
dimension of a test specimen, measured along the longitudinal
parts of the molds shall be tight fitting and firmly held together
axis, due to causes other than applied load.
when assembled, and their surfaces shall be smooth and free of
pits. The molds shall be made of steel or other hard metal not
readily attacked by the cement paste, mortar, or concrete. The
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This practice is under the jurisdiction ofASTM Committee C01 on Cement and
sides of the molds shall be sufficiently rigid to prevent
is the direct responsibility of Subcommittee C01.95 on Coordination of Standards.
spreading or warping. For the molds shown in Fig. 1, the
Current edition approved Oct. 1, 2011. Published November 2011. Originally
tolerance on dimensionAis 60.7 mm. For the molds shown in
approved in 1962. Last previous edition approved in 2010 as C490/C490M–10.
DOI: 10.1520/C0490_C0490M-11E01.
Fig. 2, the tolerance on dimension A is 60.03 in.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2.2 Each end plate of the mold shall be equipped to hold
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
properly in place, during the setting period, one of the gauge
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. studs shown in Fig. 1 or Fig. 2. The gauge studs shall be of
*A Summary of Changes section appears at the end of this standard
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