ASTM C1679-22
(Practice)Standard Practice for Measuring Hydration Kinetics of Hydraulic Cementitious Mixtures Using Isothermal Calorimetry
Standard Practice for Measuring Hydration Kinetics of Hydraulic Cementitious Mixtures Using Isothermal Calorimetry
SIGNIFICANCE AND USE
5.1 Thermal power curves are used to evaluate the isothermal hydration kinetics of the combined mixture of different materials during the early period after being mixed with water. These isothermal power curves, or hydration profiles, may provide indications relative to setting characteristics, compatibility of different materials, sulfate balance and early strength development. The isothermal hydration profiles can also be used to evaluate the effects of compositions, proportions, and time of addition of materials as well as curing temperature. Special care must be used in evaluating extended retardation with paste specimens, which have been shown to overestimate the retardation of some mixtures containing cement, SCM, and admixtures.
5.2 This procedure can be used to measure the effect of chemical admixtures on the cement hydration profile. In many cases, the addition of chemical admixture changes the kinetics of cement hydration.
5.3 Although this technique has been used historically to understand issues related to setting and slump loss, it must be emphasized that isothermal calorimetry results cannot predict concrete performance definitely, either positively or negatively. Extensive verification in concrete at planned dosages and temperatures, and at higher dosages, is needed. Isothermal calorimetry is an effective tool to identify sensitivities, so that concrete testing can be efficiently planned and performed.
5.4 This practice provides a means of assessing the relative hydration performance of various test mixtures compared with control mixtures that are prepared in a similar manner.
5.5 The procedure and apparatus can be used to monitor the thermal power from pastes and mortars alone or in combination with chemical admixtures.
5.6 The isothermal calorimeter described here can be used to measure the thermal power and heat of hydration of mortars prepared independently or obtained by wet sieving from concrete in accordance with Practice C172/C1...
SCOPE
1.1 This practice describes the apparatus and procedure for measuring relative differences in hydration kinetics of hydraulic cementitious mixtures, either in paste or mortar (see Note 1), including those containing admixtures, various supplementary cementitious materials (SCM), and other fine materials by measuring the thermal power using an isothermal calorimeter.
Note 1: Paste specimens are often preferred for mechanistic research when details of individual reaction peaks are important or for particular calorimetry configurations. Mortar specimens may give results that have better correlation with concrete setting and early strength development and are often preferred to evaluate different mixture proportions for concrete. Both paste and mortar studies have been found to be effective in evaluating concrete field problems due to incompatibility of materials used in concrete mixtures.
1.2 This practice does not cover the measurement of heat of hydration. Heat of hydration can be determined according to Test Method C1702.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in 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.
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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: C1679 − 22
Standard Practice for
Measuring Hydration Kinetics of Hydraulic Cementitious
1
Mixtures Using Isothermal Calorimetry
This standard is issued under the fixed designation C1679; 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* 2. Referenced Documents
3
1.1 This practice describes the apparatus and procedure for 2.1 ASTM Standards:
measuring relative differences in hydration kinetics of hydrau- C125 Terminology Relating to Concrete and Concrete Ag-
lic cementitious mixtures, either in paste or mortar (see Note gregates
1), including those containing admixtures, various supplemen- C172/C172M Practice for Sampling Freshly Mixed Con-
tary cementitious materials (SCM), and other fine materials by crete
measuring the thermal power using an isothermal calorimeter. C219 Terminology Relating to Hydraulic and Other Inor-
NOTE 1—Paste specimens are often preferred for mechanistic research
ganic Cements
when details of individual reaction peaks are important or for particular
C305 Practice for Mechanical Mixing of Hydraulic Cement
calorimetry configurations. Mortar specimens may give results that have
Pastes and Mortars of Plastic Consistency
better correlation with concrete setting and early strength development
C403/C403M Test Method for Time of Setting of Concrete
and are often preferred to evaluate different mixture proportions for
Mixtures by Penetration Resistance
concrete. Both paste and mortar studies have been found to be effective in
evaluating concrete field problems due to incompatibility of materials
C511 Specification for Mixing Rooms, Moist Cabinets,
used in concrete mixtures.
Moist Rooms, and Water Storage Tanks Used in the
1.2 This practice does not cover the measurement of heat of
Testing of Hydraulic Cements and Concretes
hydration. Heat of hydration can be determined according to C778 Specification for Standard Sand
Test Method C1702.
C1005 Specification for Reference Masses and Devices for
Determining Mass and Volume for Use in Physical Testing
1.3 The values stated in SI units are to be regarded as
of Hydraulic Cements
standard. No other units of measurement are included in this
C1602/C1602M Specification for Mixing Water Used in the
standard.
Production of Hydraulic Cement Concrete
1.4 This standard does not purport to address all of the
C1702 Test Method for Measurement of Heat of Hydration
safety concerns, if any, associated with its use. It is the
of Hydraulic Cementitious Materials Using Isothermal
responsibility of the user of this standard to establish appro-
Conduction Calorimetry
priate safety, health, and environmental practices and deter-
C1738/C1738M Practice for High-Shear Mixing of Hydrau-
mine the applicability of regulatory limitations prior to use.
lic Cement Pastes
(Warning—Fresh hydraulic cementitious mixtures are caustic
and may cause chemical burns to skin and tissue upon
3. Terminology
2
prolonged exposure. )
3.1 Definitions—For definitions of terms used in this
1.5 This international standard was developed in accor-
practice, refer to Terminology C125 and Terminology C219.
dance with internationally recognized principles on standard-
3.2 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.2.1 baseline, n—the signal from the calorimeter when
Development of International Standards, Guides and Recom-
there is an inert specimen in the instrument.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.2.2 calcium aluminate, n—various aluminate phases in-
cluding but not limited to the tricalcium aluminate and ferrite
phases in portland cement clinker, calcium aluminate phases
1
This practice is under the jurisdiction of ASTM Committee C09 on Concrete
occurring in some supplementary cementitious materials, and
and Concrete Aggregates and is the direct responsibility of Subcommittee C09.48 on
Performance of Cementitious Materials and Admixture Combinations.
Current edition approved Dec. 15, 2022. Published February 2023. Originally
3
approved in 2007. Last previous edition approved in 2017 as C1679 – 17. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/C1679-22. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Standards volume information, refer to the standard’s Docum
...
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: C1679 − 17 C1679 − 22
Standard Practice for
Measuring Hydration Kinetics of Hydraulic Cementitious
1
Mixtures Using Isothermal Calorimetry
This standard is issued under the fixed designation C1679; 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*
1.1 This practice describes the apparatus and procedure for measuring relative differences in hydration kinetics of hydraulic
cementitious mixtures, either in paste or mortar (see Note 1), including those containing admixtures, various supplementary
cementitious materials (SCM), and other fine materials by measuring the thermal power using an isothermal calorimeter.
NOTE 1—Paste specimens are often preferred for mechanistic research when details of individual reaction peaks are important or for particular calorimetry
configurations. Mortar specimens may give results that have better correlation with concrete setting and early strength development and are often preferred
to evaluate different mixture proportions for concrete. Both paste and mortar studies have been found to be effective in evaluating concrete field problems
due to incompatibility of materials used in concrete mixtures.
1.2 This practice does not cover the measurement of heat of hydration. Heat of hydration can be determined according to Test
Method C1702.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in 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 and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may
2
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
3
2.1 ASTM Standards:
C125 Terminology Relating to Concrete and Concrete Aggregates
C172/C172M Practice for Sampling Freshly Mixed Concrete
C219 Terminology Relating to Hydraulic and Other Inorganic Cements
C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
C403/C403M Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance
1
This practice is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.48 on
Performance of Cementitious Materials and Admixture Combinations.
Current edition approved Dec. 1, 2017Dec. 15, 2022. Published January 2018February 2023. Originally approved in 2007. Last previous edition approved in 20142017
as C1679 – 14.C1679 – 17. DOI: 10.1520/C1679-17.10.1520/C1679-22.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
1
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C1679 − 22
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C778 Specification for Standard Sand
C1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in Physical Testing of
Hydraulic Cements
C1602/C1602M Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete
C1702 Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction
Calorimetry
C1738/C1738M Practice for High-Shear Mixing of Hydraulic Cement Pastes
...
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