SIST EN 196-12:2025

Reactivity of cement constituents - Heat of hydration and bound water content methods

This document specifies two complementary test methods to assess the chemical reactivity of a pozzolanic or latent hydraulic cement constituent by measurements of heat of hydration (see Clause 5 and 8.3 Method A, Heat of Hydration) or bound water content (see Clause 5 and 8.4 Method B, Bound Water Content) of hydrated pastes composed of the cement constituent, calcium hydroxide, calcium carbonate, potassium sulfate, and potassium hydroxide cured at 40 °C for 72 h and 168 h (3 days and 7 days).
These two test methods do not distinguish between latent hydraulic and pozzolanic reactivity. Therefore, these methods are used for measuring the chemical reactivity of following cement constituents as specified under EN 197 1 and EN 197 5: S, D, P, Q, V, W and T.
These test methods are used in complement with the current specifications on cement constituent reactivity given by EN 197 1 and EN 197 5, i.e. the reactive silicon dioxide content measured according to EN 196 2 for cement constituents P, Q and V; the compressive strength of specified test mortars determined according to EN 196-1 for cement constituents W and T, and the pozzolanicity of pozzolanic cements according to EN 196 5 for CEM IV type cements according to EN 197-1.
The test methods are used for qualification purposes if the cement constituents are tested at the fineness of the intended use.
NOTE In case the test methods are used for purposes of comparison of intrinsic reactivity, cement constituents are tested at similar fineness, where possible.
The test methods are also used for testing other new constituents that are latent hydraulic or pozzolanic and that are not covered by EN 197-1 and EN 197-5. However, for such new constituents the validity of the underlying correlations with strength development have not been verified; in consequence the test results can only be used for informative and indicative purposes.
Furthermore, these test methods are used in manufacturing control of cement constituents for assessing their latent hydraulic or pozzolanic reactivity.

Reaktivität von Zementbestandteilen - Verfahren zur Bestimmung der Hydratationswärme und des chemisch gebundenen Wassers

Dieses Dokument legt zwei sich ergänzende Prüfverfahren fest zur Bewertung der chemischen Reaktivität eines puzzolanischen oder latent hydraulischen Zementbestandteils durch Messung der Hydratationswärme (siehe Abschnitt 5 und 8.3, Verfahren A, Hydratationswärme) oder des gebundenen Wassergehalts (siehe Abschnitt 5 und 8.4, Verfahren B, Gebundener Wassergehalt) von hydratisierten Zementleimen, die aus dem Zementbestandteil, Calciumhydroxid, Calciumcarbonat, Kaliumsulfat und Kaliumhydroxid bestehen und für 72 h und 168 h (3 Tage und 7 Tage) bei 40 °C ausgehärtet wurden.
Diese beiden Prüfverfahren unterscheiden nicht zwischen latent hydraulischer und puzzolanischer Reaktivität. Deshalb werden diese beiden Verfahren zur Messung der chemischen Reaktivität der folgenden in EN 197 1 und EN 197 5 festgelegten Zementbestandteile verwendet: S, D, P, Q, V, W und T.
Diese Prüfverfahren werden als Ergänzung zu den derzeitigen Spezifikationen zur Reaktivität von Zement-bestandteilen angewendet, die in EN 197 1 und EN 197 5 angegeben sind, d. h. der nach EN 196 2 gemessene reaktive Siliciumdioxidgehalt für die Zementbestandteile P, Q und V, die Druckfestigkeit von festgelegten Prüfmörteln nach EN 196 1 für die Zementbestandteile W und T, und die Puzzolanität von Puzzolanzement nach EN 196 5 für Zement des Typs CEM IV nach EN 197 1.
Die Prüfverfahren werden zu Qualifizierungszwecken angewendet, wenn die Zementbestandteile mit der Mahlfeinheit für die bestimmungsgemäße Verwendung geprüft werden.
ANMERKUNG Für den Fall, dass die Prüfverfahren für Vergleiche der intrinsischen Reaktivität angewendet werden, werden die Zementbestandteile bei einer vergleichbaren Mahlfeinheit geprüft, soweit dies möglich ist.
Die Prüfverfahren werden auch für die Prüfung anderer neuartiger Bestandteile, die latent hydraulisch oder puzzolanisch sind und die die nicht in EN 197-1 und EN 197-5 behandelt werden, angewendet. Für derartige neue Bestandteile wurde die Gültigkeit der zugrundeliegenden Korrelationen mit der Festigkeitsentwicklung jedoch noch nicht verifiziert; somit können die Prüfergebnisse ausschließlich für informative und indikative Zwecke genutzt werden.
Darüber hinaus werden diese Prüfverfahren bei der Produktionskontrolle von Zementbestandteilen zur Bewertung ihrer latent hydraulischen oder puzzolanischen Reaktivität eingesetzt.

Réactivité des constituants du ciment - Méthodes de détermination de la chaleur d’hydratation et de la teneur en eau liée

Le présent document spécifie deux méthodes d’essai complémentaires pour évaluer la réactivité chimique d’un constituant pouzzolanique ou hydraulique latent du ciment par mesurages de la chaleur d’hydratation (voir l’Article 5 et le paragraphe 8.3 Méthode A, Chaleur d’hydratation) ou de la teneur en eau liée (voir l’Article 5 et le paragraphe 8.4 Méthode B, Teneur en eau liée) des pâtes de ciment hydraté composées du constituant du ciment, d’hydroxyde de calcium, de carbonate de calcium, de sulfate de potassium et d’hydroxyde de potassium vieillies à 40 °C pendant 72 h et 168 h (3 jours et 7 jours).
Ces deux méthodes d’essai ne font pas de distinction entre la réactivité hydraulique latente et pouzzolanique. Par conséquent, ces méthodes sont utilisées pour mesurer la réactivité chimique des constituants du ciment suivants comme spécifié dans l’EN 197 1 et l’EN 197 5 : S, D, P, Q, V, W et T.
Ces méthodes d’essai sont utilisées en complément des spécifications actuelles relatives à la réactivité des constituants du ciment données par l’EN 197 1 et l’EN 197 5, c’est-à-dire la teneur en dioxyde de silicium réactif mesurée conformément à l’EN 196 2 pour les constituants du ciment P, Q et V, la résistance à la compression des mortiers d’essai spécifiés et déterminés conformément à l’EN 196 1 pour les constituants du ciment W et T, et la pouzzolanicité des ciments pouzzolaniques conformément à l’EN 196 5 pour les ciments CEM IV conformément à l’EN 197 1.
Les méthodes d’essai sont utilisées à des fins de qualification si les constituants du ciment sont soumis à essai à la finesse de l’usage prévu.
NOTE Si les méthodes d’essai sont utilisées à des fins de comparaison de la réactivité intrinsèque, les constituants du ciment sont soumis à essai à une finesse similaire, dans la mesure du possible.
Ces méthodes d’essai sont également utilisées pour soumettre à essai d’autres nouveaux constituants qui sont hydrauliques latents ou pouzzolaniques et qui ne sont pas couverts par l’EN 197-1 et l’EN 197-5. Toutefois, pour ces nouveaux constituants, la validité des corrélations sous-jacentes avec le développement de la résistance n’a pas été vérifiée ; en conséquence, les résultats d’essai ne peuvent être utilisés qu’à des fins informatives et indicatives.
En outre, ces méthodes d’essai sont utilisées pour le contrôle en fabrication des constituants du ciment afin d’évaluer leur réactivité hydraulique latente ou pouzzolanique.

Reaktivnost sestavin cementa - Metodi za določanje hidratacijske toplote in vsebnosti vezane vode

General Information

• Status: Not Published
• Public Enquiry End Date: 01-Aug-2023
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: CAA - Mineral binders and masonry
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Dec-2024
• Due Date: 16-Feb-2025
• Ref Project: EN 196-12:2024 - Methods of testing cement - Part 12: Reactivity of cement constituents - Heat of hydration and bound water content methods

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17979:2023
01-julij-2023
Reaktivnost sestavin cementa - Metoda za določanje hidracijske toplote in
vsebnosti vezane vode
Reactivity of cement constituents - Heat of hydration and bound water content methods
Reaktivität von Zementbestandteilen - Verfahren zur Bestimmung der
Hydratationswärme und des chemisch gebundenen Wassers
Réactivité des constituants du ciment - Méthodes de détermination de la chaleur
d’hydratation et de la teneur en eau liée
Ta slovenski standard je istoveten z: prEN 17979
ICS:
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
oSIST prEN 17979:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17979:2023
oSIST prEN 17979:2023
DRAFT
EUROPEAN STANDARD
prEN 17979
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2023
ICS
English Version
Reactivity of Cement Constituents - Heat of Hydration and
Bound Water methods
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 51.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17979:2023 E
worldwide for CEN national Members.

oSIST prEN 17979:2023
prEN 17979:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 General requirements for testing . 5
4.1 Number of tests . 5
4.2 Repeatability and reproducibility . 5
4.2.1 Repeatability . 5
4.2.2 Reproducibility . 5
4.3 Expression of masses, volumes, factors and results . 5
5 Principle of test methods (A and B) . 6
6 Reagents . 6
6.1 General . 6
6.2 Calcium hydroxide (Ca(OH)2) . 6
6.3 Potassium hydroxide (KOH) . 6
6.4 Potassium sulfate . 7
6.5 Calcium carbonate (CaCO3) dried to constant mass at (200 ± 10) °C . 7
6.6 Potassium solution . 7
7 Apparatus . 7
8 Procedures. 7
8.1 Preparation of a test cement constituent specimen . 7
8.2 Testing Paste . 8
8.3 Method A, Heat of Hydration . 8
8.3.1 Preparation of the apparatus . 8
8.3.2 Paste specimen preparation . 9
8.3.3 Measurement of heat release . 9
8.3.4 Calculations . 9
8.4 Method B, Bound Water Content . 9
8.4.1 Paste specimen casting . 9
8.4.2 Paste specimen curing . 9
8.4.3 Cured specimen preparation . 9
8.4.4 Bound water content measurement .10
8.4.5 Calculations .10
8.4.6 Correction for natural pozzolana (P) containing bound water .10
9 Report .11
10 Precision .12
10.1 Method A, Heat of Hydration .12
10.1.1 Repeatability and reproducibility .12
10.2 Method B, Bound Water Content .12
10.2.1 Repeatability and reproducibility .12
Bibliography .13

oSIST prEN 17979:2023
prEN 17979:2023 (E)
European foreword
This document (prEN 17979:2023) has been prepared by Technical Committee CEN/TC 51 “Cement and
Building Limes”, the secretariat of which is held by NBN.
This document is currently submitted to the CEN Enquiry.
oSIST prEN 17979:2023
prEN 17979:2023 (E)
1 Scope
This document specifies two complementary test methods to assess the chemical reactivity of a
pozzolanic or latent hydraulic cement constituent by measurements of heat of hydration (see Clause 5
and 8.3 Method A, Heat of Hydration) or bound water content (see Clause 5 and 8.4 Method B, Bound
Water Content) of hydrated pastes composed of the cement constituent, calcium hydroxide, calcium
carbonate, potassium sulfate, and potassium hydroxide cured at 40 °C for 72 h and 168 h (3 days and 7
days).
These two test methods do not distinguish between latent hydraulic and pozzolanic reactivity. Therefore,
these methods are used for measuring the chemical reactivity of following cement constituents as
specified under EN 197-1 and EN 197-5: S, D, P, Q, V, W and T.
These test methods are used in complement with the current specifications on cement constituent
reactivity given by EN 197-1 and EN 197-5, i.e. the reactive silicon dioxide content measured according
to EN 196-2 for cement constituents P, Q and V; the compressive strength of specified test mortars
determined according to EN 196-1 for cement constituents W and T, and the pozzolanicity of pozzolanic
cements according to EN 196-5 for CEM IV type cements according to EN 197-1.
The test methods are used for qualification purposes if the cement constituents are tested at the fineness
of the intended use.
NOTE  In case the test methods are used for purposes of comparison of intrinsic reactivity, cement constituents
are tested at similar fineness, where possible.
The test methods are also used for testing other new constituents that are latent hydraulic or pozzolanic
and that are not covered by EN 197-1 and EN 197-5. However, for such new constituents the validity of
the underlying correlations with strength development have not been verified; in consequence the test
results can only be used for informative and indicative purposes.
Furthermore, these test methods are used in manufacturing control of cement constituents for assessing
their latent hydraulic or pozzolanic reactivity.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 196-2, Method of testing cement - Part 2: Chemical analysis of cement
EN 196-6, Methods of testing cement - Part 6: Determination of fineness
EN 196-11, Methods of testing cement - Part 11: Heat of hydration - Isothermal Conduction Calorimetry
method
EN 197-1, Cement - Part 1: Composition, specifications and conformity criteria for common cements
ISO 565:1990, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal
sizes of openings
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 9277, Determination of the specific surface area of solids by gas adsorption — BET method
oSIST prEN 17979:2023
prEN 17979:2023 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 197-1, EN 196-2, EN 196-11 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
chemically bound water
water, in hardened cement paste, that has reacted and is part of the structure of hydrated reaction
products; chemically bound water for a specific time is taken as the mass loss when a paste specimen,
dried previously at 40 °C, is heated in a furnace to 350 °C
Note 1 to entry: Some natural pozzolans can contain bound water and lose mass over this temperature range. This
mass loss shall be determined and used to correct the bound water value for the paste.
3.2
constituent
main cement constituent, other than clinker
4 General requirements for testing
4.1 Number of tests
For each determination, one or more tests shall be carried out in which the number of measurements to
be taken shall be as specified in the relevant clause of this document (see also 8.3 and 8.4).
4.2 Repeatability and reproducibility
4.2.1 Repeatability
Precision under repeatability conditions where independent test results are obtained with the same
method on identical test items (material) in the same laboratory by the same operator using the same
equipment within short intervals of time.
4.2.2 Reproducibility
Precision under reproducibility conditions where test results are obtained with the same method on
identical test items (material) in different laboratories with different operators using different
equipment.
4.3 Expression of masses, volumes, factors and results
Express masses in grams to the nearest 0,000 1 g.
Express the results, where a single test result has been obtained, to one decimal for the method A and to
two decimal places for the method B (see Clause 9).
Express the results, where two test results have been obtained, as the mean of the results, as a percentage
generally to two decimal places.
If the two test results differ by more than twice the standard deviation of repeatability, r
...