ASTM C490/C490M-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C490/C490M − 21
Standard Practice for
Use of Apparatus for the Determination of Length Change of
1
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.
1. Scope* of Hydraulic Cements
1.1 This practice covers the requirements for the apparatus
3. Terminology
andequipmentusedtopreparespecimensforthedetermination
3.1 Definitions:
of length change in hardened cement paste, mortar, and
3.1.1 For definitions of terms used in this test method, refer
concrete, the apparatus and equipment used for the determina-
to Terminology C219.
tion of these length changes, and the procedures for its use.
1.2 Methods for the preparation and curing of test
4. Significance and Use
specimens, conditions of testing and curing, and detailed
4.1 This practice is intended to provide standard require-
procedures for calculating and reporting test results are con-
ments for apparatus common to many test methods used in
tained in applicable test methods.
connection with cement and concrete and standardized proce-
1.3 The values stated in either SI units or inch-pound units
dures for its use. The detailed requirements as to materials,
are to be regarded separately as standard. The values stated in
mixtures, specimens, conditioning of specimens, number of
each system may not be exact equivalents; therefore, each
specimens, ages at which measurements are to be made,
system shall be used independently of the other. Combining
interpretation of results, and precision and bias are left to be
values from the two systems may result in non-conformance
dealt with in specific test methods.
with the standard.
5. Apparatus
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5.1 Reference Masses and Devices for Determining Mass
ization established in the Decision on Principles for the
and Volume, shall conform to the requirements of Specification
Development of International Standards, Guides and Recom-
C1005.
mendations issued by the World Trade Organization Technical
5.2 Molds, shall have either one or two compartments and
Barriers to Trade (TBT) Committee.
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
2
2.1 ASTM Standards:
1
prismshavinga250-mmgaugelength,orfor1by1by11 ⁄4-in.
C219 Terminology Relating to Hydraulic and Other Inor-
prisms having a 10–in. gauge length. Molds for test specimens
ganic Cements
used in the length change of concretes shall provide for prisms
C511 Specification for Mixing Rooms, Moist Cabinets,
of the desired cross section having a 10-in. or 250-mm gauge
Moist Rooms, and Water Storage Tanks Used in the
length. In some routine tests, 25 by 25 by 160-mm specimens
Testing of Hydraulic Cements and Concretes
1
with a gauge length of 125 mm, or 1 by 1 by 6 ⁄4-in. specimens
C1005 Specification for Reference Masses and Devices for
with a gauge length of 5-in. are permitted, but in case of
DeterminingMassandVolumeforUseinPhysicalTesting
dispute, results obtained with specimens of 250-mm [10-in.]
gauge length shall govern.
5.2.1 The gauge length shall be considered as the nominal
1
This practice is under the jurisdiction ofASTM Committee C01 on Cement and
length between the innermost ends of the gauge studs. The
is the direct responsibility of Subcommittee C01.95 on Coordination of Standards.
parts of the molds shall be tight fitting and firmly held together
Current edition approved Dec. 1, 2021. Published December 2021. Originally
when assembled, and their surfaces shall be smooth and free of
approved in 1962. Last previous edition approved in 2017 as C490/C490M – 17.
DOI: 10.1520/C0490_C0490M-21.
pits. The molds shall be made of steel or other hard metal not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
readily attacked by the cement paste, mortar, or concrete. The
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
sides of the molds shall be sufficiently rigid to prevent
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. spreading or warping. For the molds shown in Fig. 1, the
*A Summary of Changes section appears at the end of this standard
Copyri
...