ASTM C1064/C1064M-23

Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete

SIGNIFICANCE AND USE
4.1 This test method provides a means for measuring the temperature of freshly mixed concrete. The measured temperature represents the temperature at the time of testing and may not be an indication of the temperature of the freshly mixed concrete at a later time. It may be used to verify conformance to a specified requirement for temperature of concrete.  
4.2 Concrete containing aggregate of a nominal maximum size greater than 75 mm [3 in.] may require up to 20 min for the transfer of heat from aggregate to mortar. (See ACI Committee 207.1R Report.4)
SCOPE
1.1 This test method covers the determination of temperature of freshly mixed hydraulic-cement concrete.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.3 The text of this standard refers to notes and footnotes that provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)  
1.5 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.

General Information

• Status: Published
• Publication Date: 30-Nov-2023
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.60 - Testing Fresh Concrete

Relations

• Replaces: ASTM C1064/C1064M-17 - Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
• Effective Date: 01-Dec-2023
• Refers: ASTM C670-24a - Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
• Effective Date: 01-Feb-2024
• Refers: ASTM C670-24 - Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
• Effective Date: 01-Jan-2024
• Refers: ASTM C670-15 - Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
• Effective Date: 15-Jun-2015
• Referred By: ASTM C1077-24 - Standard Practice for Agencies Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Testing Agency Evaluation
• Effective Date: 01-Dec-2023
• Referred By: ASTM C173/C173M-24 - Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
• Effective Date: 01-Dec-2023
• Referred By: ASTM C173/C173M-23 - Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
• Effective Date: 01-Dec-2023
• Referred By: ASTM C1077-17 - Standard Practice for Agencies Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Testing Agency Evaluation
• Effective Date: 01-Dec-2023
• Referred By: ASTM C1768/C1768M-12(2017) - Standard Practice for Accelerated Curing of Concrete Cylinders
• Effective Date: 01-Dec-2023
• Referred By: ASTM C31/C31M-24a - Standard Practice for Making and Curing Concrete Test Specimens in the Field
• Effective Date: 01-Dec-2023
• Referred By: ASTM C1709-22 - Standard Guide for Evaluation of Alternative Supplementary Cementitious Materials (ASCM) for Use in Concrete
• Effective Date: 01-Dec-2023
• Referred By: ASTM C94/C94M-23 - Standard Specification for Ready-Mixed Concrete
• Effective Date: 01-Dec-2023
• Referred By: ASTM C1019-20 - Standard Test Method for Sampling and Testing Grout for Masonry
• Effective Date: 01-Dec-2023
• Referred By: ASTM D6449-99(2015)e1 - Standard Test Method for Flow of Fine Aggregate Concrete for Fabric Formed Concrete (Flow Cone Method) (Withdrawn 2024)
• Effective Date: 01-Dec-2023
• Referred By: ASTM C192/C192M-19 - Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory
• Effective Date: 01-Dec-2023

Overview

ASTM C1064/C1064M-23: Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete establishes procedures for accurately determining the temperature of freshly mixed hydraulic-cement concrete. This internationally recognized test method provides a reliable means of verifying concrete temperature at the time of testing, helping ensure quality control and adherence to specified requirements during construction. The standard is applicable to a wide range of projects using hydraulic-cement concrete and accommodates both SI and inch-pound units, in accordance with global standardization practices.

Key Topics

• Purpose and Significance

  • Ensures concrete temperature is within specified limits, which is critical for workability, set time, and strength development.
  • Confirms conformance to temperature requirements, supporting project specifications and construction quality control.
  • Notes that temperature of large-aggregate concrete may take up to 20 minutes to stabilize between aggregate and mortar.

• Measurement Process

  • Requires use of a certified temperature measuring device immersed at least 75 mm (3 in.) into the concrete sample, with adequate concrete surround.
  • The temperature reading should be taken after at least 2 minutes, but not more than 5 minutes, ensuring accuracy at the point of placement or sampling.
  • Emphasizes yearly verification of temperature measuring device accuracy, with records maintained in the laboratory-including device identification and operator name.

• Dual Unit System

  • Specifies that SI units and inch-pound units are both standard, but must not be combined within a single measurement or test result.

• Safety Considerations

  • Highlights potential risks: freshly mixed hydraulic cement is caustic and can cause chemical burns upon prolonged contact with skin or tissue.
  • Users must establish safety, health, and environmental protocols and consider regulatory requirements specific to their site.

Applications

ASTM C1064/C1064M-23 is vital for a variety of construction and quality assurance scenarios, including:

• On-Site Concrete Placement
  • Used directly at construction sites to confirm concrete being poured meets temperature specifications, which is important for structural integrity and curing performance.
• Quality Control Laboratories
  • Adopted by laboratories and testing agencies to ensure reliable temperature readings as part of broader concrete quality assessments.
• Ready-Mix and Precast Plants
  • Utilized by concrete producers to monitor batch temperatures before transportation or molding, minimizing issues due to extreme temperature variations.
• Regulatory and Contract Compliance
  • Ensures contractors and suppliers meet project or specification temperature requirements, helping avoid costly rejections or delays.
• Research and Development
  • Employed in academic, governmental, and industrial research to study effects of temperature on concrete setting and strength characteristics.

Related Standards

Several standards complement ASTM C1064/C1064M-23 in the field of concrete testing and quality assurance:

• ASTM C125 – Terminology Relating to Concrete and Concrete Aggregates: Provides definitions for terms used in concrete testing.
• ASTM C172/C172M – Practice for Sampling Freshly Mixed Concrete: Specifies procedures for obtaining and handling concrete samples.
• ASTM C670 – Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials: Addresses statistical accuracy and repeatability for test methods.

ASTM C1064/C1064M-23 is essential for ensuring the consistency, safety, and performance of hydraulic-cement concrete through accurate temperature measurement, supporting construction quality, regulatory compliance, and project success.

Standards Content (Sample)

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: C1064/C1064M − 23
Standard Test Method for
Temperature of Freshly Mixed Hydraulic-Cement Concrete
This standard is issued under the fixed designation C1064/C1064M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* C125 Terminology Relating to Concrete and Concrete Ag-
gregates
1.1 This test method covers the determination of tempera-
C172/C172M Practice for Sampling Freshly Mixed Con-
ture of freshly mixed hydraulic-cement concrete.
crete
1.2 The values stated in either SI units or inch-pound units
C670 Practice for Preparing Precision and Bias Statements
are to be regarded separately as standard. The values stated in
for Test Methods for Construction Materials
each system are not necessarily exact equivalents; therefore, to
ensure conformance with the standard, each system shall be
3. Terminology
used independently of the other, and values from the two
3.1 For definitions of the terms used in this test method,
systems shall not be combined.
refer to Terminology C125.
1.3 The text of this standard refers to notes and footnotes
4. Significance and Use
that provide explanatory information. These notes and foot-
notes (excluding those in tables and figures) shall not be
4.1 This test method provides a means for measuring the
considered as requirements of this standard.
temperature of freshly mixed concrete. The measured tempera-
1.4 This standard does not purport to address all of the ture represents the temperature at the time of testing and may
safety concerns, if any, associated with its use. It is the not be an indication of the temperature of the freshly mixed
responsibility of the user of this standard to establish appro- concrete at a later time. It may be used to verify conformance
priate safety, health, and environmental practices and deter- to a specified requirement for temperature of concrete.
mine the applicability of regulatory limitations prior to use.
4.2 Concrete containing aggregate of a nominal maximum
(Warning—Fresh hydraulic cementitious mixtures are caustic
size greater than 75 mm [3 in.] may require up to 20 min for the
and may cause chemical burns to skin and tissue upon
transfer of heat from aggregate to mortar. (See ACI Committee
prolonged exposure. ) 4
207.1R Report. )
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Apparatus
ization established in the Decision on Principles for the
5.1 Container, shall be large enough to provide at least 75
Development of International Standards, Guides and Recom-
mm [3 in.] of concrete in all directions around the sensor of the
mendations issued by the World Trade Organization Technical
temperature measuring device; concrete cover must also be at
Barriers to Trade (TBT) Committee.
least three times the nominal maximum size of the coarse
aggregate.
2. Referenced Documents
3 5.2 Temperature Measuring Device, shall be capable of
2.1 ASTM Standards:
accurately measuring the temperature of the freshly mixed
concrete to 6 0.5 °C [61 °F] throughout a range of 0° to 50 °C
1 [30° to 120 °F]. The design of the temperature measuring
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee device shall be such that it allows 75 mm [3 in.] or more
C09.60 on Testing Fresh Concrete.
immersion during operation.
Current edition approved Dec. 1, 2023. Published December 2023. Originally
approved in 1986. Last previous edition approved in 2017 as C1064/C1064M–17. 5.3 Partial immersion liquid-in-glass thermometers (and
DOI: 10.1520/C1064_C1064M-23.
possibly other types) shall have a permanent mark to which the
Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
device must be immersed without applying a correction factor.
Annual Book of ASTM Standards, Vol 04.02.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from American Concrete Institute (ACI), P.O. Box 9094, Farmington
the ASTM website. Hills, MI 48333-9094, http://www.concrete.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1064/C1064M − 23
5.4 Reference Temperature Measuring Device, shall be 7.2.1 Immediately, prior to sampling the freshly mixed
readable and accurate to 6 0.2 °C [0.5 °F] at the verification concrete, dampen (with water) the sample container.
points in 6.1. A certificate or report that verifies the accuracy 7.2.2 Sample the freshly mixed concrete in accordance with
shall be available in the laboratory for review. Accuracy of Practice C172/C172M, except that composite samples are not
liquid-in-glass reference temperature measuring devices shall required if the only purpose for obtaining the sample is to
be verified once. Verification of direct-reading resistance ref- determine temperature.
erence temperature measuring devices shall be performed at 7.2.3 Place the freshly mixed concrete into the container.
least every twelve (12) months. The certificate or report shall
8. Procedure
provide documentation that the reference standard used in the
verification is traceable to the National Institute of Standards
8.1 Position the temperature measuring device so that the
and Technology (NIST).
end of the temperature sensing portion i
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1064/C1064M − 17 C1064/C1064M − 23
Standard Test Method for
Temperature of Freshly Mixed Hydraulic-Cement Concrete
This standard is issued under the fixed designation C1064/C1064M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers the determination of temperature of freshly mixed hydraulic-cement concrete.
1.2 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 beare not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.3 The text of this standard references refers to notes and footnotes that provide explanatory information. These notes and
footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns
to skin and tissue upon prolonged exposure. )
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
C125 Terminology Relating to Concrete and Concrete Aggregates
C172/C172M Practice for Sampling Freshly Mixed Concrete
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
3. Terminology
3.1 For definitions of the terms used in this test method, refer to Terminology C125.
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.60 on
Testing Fresh Concrete.
Current edition approved Oct. 1, 2017Dec. 1, 2023. Published October 2017December 2023. Originally approved in 1986. Last previous edition approved in 20122017
as C1064/C1064M–12. DOI: 10.1520/C1064_C1064M-17.–17. DOI: 10.1520/C1064_C1064M-23.
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1064/C1064M − 23
4. Significance and Use
4.1 This test method provides a means for measuring the temperature of freshly mixed concrete. The measured temperature
represents the temperature at the time of testing and may not be an indication of the temperature of the freshly mixed concrete at
a later time. It may be used to verify conformance to a specified requirement for temperature of concrete.
4.2 Concrete containing aggregate of a nominal maximum size greater than 75 mm [3 in.] may require up to 20 min for the transfer
of heat from aggregate to mortar. (See ACI Committee 207.1R Report. )
5. Apparatus
5.1 Container, shall be large enough to provide at least 75 mm [3 in.] of concrete in all directions around the sensor of the
temperature measuring device; concrete cover must also be at least three times the nominal maximum size of the coarse aggregate.
5.2 Temperature Measuring Device, shall be capable of accurately measuring the temperature of the freshly mixed concrete to
6 0.5 °C [61 °F] throughout a range of 0° to 50 °C [30° to 120 °F]. The design of the temperature measuring device shall be such
that it allows 75 mm [3 in.] or more immersion during operation.
5.3 Partial immersion liquid-in-glass thermometers (and possibly other types) shall have a permanent mark to which the device
must be immersed without applying a correction factor.
5.4 Reference Temperature Measuring Device, shall be readable and accurate to 6 0.2 °C [0.5 °F] at the verification points in 6.1.
A certificate or report that verifies the accuracy shall be available in the laboratory for review. Accuracy of liquid-in-glass reference
temperature measuring devices shall be verified once. Verification of direct-reading resistance reference temperature measuring
devices shall be performed at least every twelve (12) months. The certificate or report shall provide documentation that the
reference standard used in the verification is traceable to the National Institute of Standards and Technology (NIST).
6. Verification of the Accuracy of Temperature Measuring Devices
6.1 The accuracy of each temperature measuring device used for determining the temperature of freshly mixed concrete shall be
verified at least annually, every twelve (12) months, or whenever there is a question of accuracy. Verify the accuracy of the
temperature measuring device by comparing the readings of the reference temperature measuring device to the temperature
measuring device at two temperatures at least 15 °C [30 °F] apart.
6.2 Verification of the accuracy of the temperature measuring devices may
...