ASTM C1064/C1064M-99

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Designation: C 1064/C 1064M – 99
Standard Test Method for
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 nominal maximum size of the coarse aggregate.
4.2 Temperature Measuring Device, shall be capable of
1.1 This test method covers the determination of tempera-
accurately measuring the temperature of the freshly mixed
ture of freshly mixed portland cement concrete.
concrete to 61°F [60.5°C] throughout a range of 30° to 120°F
1.2 The values stated in inch-pound or SI units are to be
[0° to 50°C]. The temperature measuring device shall require
regarded separately as standard. Within the text, SI units are
immersion of 3 in. [75 mm] or less during operation.
shown in brackets. The values stated in each system are not
4.3 Partial immersion liquid-in-glass thermometers (and
exact equivalents; therefore, each system shall be used inde-
possibly other types) shall have a permanent mark to which the
pendently of the other. Combining values from the two systems
device must be immersed without applying a correction factor.
may result in nonconformance with the specification.
4.4 Reference Temperature Measuring Device, shall be
1.3 This standard does not purport to address all of the
readable and accurate to 6 0.5°F [0.2°C] at the verification
safety concerns, if any, associated with its use. It is the
points in 5.1. A certificate or report that verifies the accuracy
responsibility of the user of this standard to establish appro-
shall be available in the laboratory for review. The certificate or
priate safety and health practices and determine the applica-
report shall provide documentation that the reference standard
bility of regulatory limitations prior to use.
used in the verification is traceable to NIST.
2. Referenced Documents
5. Calibration of Temperature Measuring Device
2.1 ASTM Standards:
5.1 Each temperature measuring device used for determin-
C 172 Practice for Sampling Freshly Mixed Concrete
ing temperature of freshly mixed concrete shall be calibrated
3. Significance and Use annually, or whenever there is a question of accuracy. This
calibration shall be performed by comparing the readings of the
3.1 This test method provides a means for measuring the
temperature measuring device at two temperatures at least
temperature of freshly mixed concrete. It may be used to verify
30°F [15°C] apart.
conformance to a specified requirement for temperature of
5.2 Calibration of the temperature measuring devices may
concrete.
be made in oil or other suitable baths having uniform density
3.2 Concrete containing aggregate of a nominal maximum
if provision is made to:
size greater than 3 in. [75 mm] may require up to 20 min for the
5.2.1 Maintain the bath temperature constant within 0.5°F
transfer of heat from aggregate to mortar. (See ACI Committee
[0.2°C] during the period of the test.
207.1R Report. )
5.2.2 Have both the temperature and reference temperature
4. Apparatus
measuring devices maintained in the bath for a minimum of 5
min before reading temperatures.
4.1 Container, shall be made of nonabsorptive material and
5.2.3 Continuously circulate the bath liquid to provide a
large enough to provide at least 3 in. [75 mm] of concrete in all
uniform temperature.
directions around the sensor of the temperature measuring
5.2.4 Slightly tap thermometers containing liquid to avoid
device; concrete cover must also be at least three times the
adhesion of the liquid t
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