ASTM C1064/C1064M-01

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Designation: C 1064/C 1064M – 01
Standard Test Method for
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Temperature of Freshly Mixed Portland Cement Concrete
This standard is issued under the fixed designation C 1064/C 1064M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4.2 Temperature Measuring Device, shall be capable of
accurately measuring the temperature of the freshly mixed
1.1 This test method covers the determination of tempera-
concrete to 61°F [60.5°C] throughout a range of 30° to 120°F
ture of freshly mixed portland cement concrete.
[0° to 50°C]. The temperature measuring device shall require
1.2 The values stated in inch-pound or SI units are to be
immersion of 3 in. [75 mm] or less during operation.
regarded separately as standard. Within the text, SI units are
4.3 Partial immersion liquid-in-glass thermometers (and
shown in brackets. The values stated in each system are not
possibly other types) shall have a permanent mark to which the
exact equivalents; therefore, each system shall be used inde-
device must be immersed without applying a correction factor.
pendently of the other. Combining values from the two systems
4.4 Reference Temperature Measuring Device, shall be
may result in nonconformance with the specification.
readable and accurate to 60.5°F [0.2°C] at the verification
1.3 This standard does not purport to address all of the
points in 5.1. A certificate or report that verifies the accuracy
safety concerns, if any, associated with its use. It is the
shall be available in the laboratory for review. Accuracy of
responsibility of the user of this standard to establish appro-
liquid-in-glass reference temperature measuring devices shall
priate safety and health practices and determine the applica-
be verified once. Verification of direct-reading resistance ref-
bility of regulatory limitations prior to use.
erence termperature measuring device shall be performed
2. Referenced Documents
every twelve months. The certificate or report shall provide
documentation that the reference standard used in the verifi-
2.1 ASTM Standards:
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cation is traceable to NIST.
C 172 Practice for Sampling Freshly Mixed Concrete
5. Calibration of Temperature Measuring Device
3. Significance and Use
5.1 Each temperature measuring device used for determin-
3.1 This test method provides a means for measuring the
ing temperature of freshly mixed concrete shall be calibrated
temperature of freshly mixed concrete. It may be used to verify
annually, or whenever there is a question of accuracy. This
conformance to a specified requirement for temperature of
calibration shall be performed by comparing the readings of the
concrete.
temperature measuring device at two temperatures at least
3.2 Concrete containing aggregate of a nominal maximum
30°F [15°C] apart.
size greater than 3 in. [75 mm] may require up to 20 min for the
5.2 Calibration of the temperature measuring devices may
transfer of heat from aggregate to mortar. (See ACI Committee
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be made in oil or other suitable baths having uniform density
207.1R Report. )
if provision is made to:
4. Apparatus
5.2.1 Maintain the bath temperature constant within 0.5°F
[0.2°C] during the period of the test.
4.1 Container, shall be made of nonabsorptive material and
5.2.2 Have both the temperature and reference temperature
large enough to provide at least 3 in. [75 mm] of concrete in all
measuring devices maintained in the bath for a minimum of 5
directions around the sensor of the temperature measuring
min before reading temperatures.
device; concrete cover must also be at least three times the
5.2.3 Continuously circulate the bath liquid to provide a
nominal maximum size of the coarse aggregate.
uniform temperature.
5.2.4 Slightly tap thermometers containing liquid to avoid
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This test method is under the jurisdiction of ASTM Committee C09 on
adhesion of the liquid to the glass if the temperature exposure
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
is being reduced.
C09.60 on Fresh Concrete Testing.
Current edition approved Nov. 10, 2001. Published January 2002. Originally
published as C 1064 – 86. Last previous edition C 1064 – 99.
6. Sampling Concrete
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Annual Book of ASTM Standards, Vol 04.02.
3 6.1 The temperature of freshly mixed concrete may be
Available from American Concrete Institute, Box 9094, Farmington Hills, MI
48333. measured in the transporting equipment provided the sensor of
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