oSIST prEN 12390-10:2025

SLOVENSKI STANDARD
01-december-2025
Preskušanje strjenega betona - 10. del: Določanje odpornosti betona proti
karbonatizaciji pri atmosferski koncentraciji ogljikovega dioksida
Testing hardened concrete - Part 10: Determination of the carbonation resistance of
concrete at atmospheric levels of carbon dioxide
Prüfung von Festbeton - Teil 10: Bestimmung des Karbonatisierungswiderstandes von
Beton bei atmosphärischer Konzentration von Kohlenstoffdioxid
Essais pour béton durci - Partie 10 : Détermination de la résistance à la carbonatation du
béton à des niveaux atmosphériques de dioxyde de carbone
Ta slovenski standard je istoveten z: prEN 12390-10
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 91.100.30 Will supersede EN 12390-10:2018
English Version
Testing hardened concrete - Part 10: Determination of the
carbonation resistance of concrete at atmospheric levels of
carbon dioxide
Essais pour béton durci - Partie 10 : Détermination de Prüfung von Festbeton - Teil 10: Bestimmung des
la résistance à la carbonatation du béton à des niveaux Karbonatisierungswiderstandes von Beton bei
atmosphériques de dioxyde de carbone atmosphärischer Konzentration von Kohlenstoffdioxid
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 104.
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12390-10:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 6
5 Reagents and apparatus . 7
6 Production of specimens . 7
6.1 General . 7
6.2 Procedure when using climate controlled chamber . 8
6.3 Procedure when using a natural exposure site . 8
7 Carbonation depth measurements . 9
7.1 Testing age and generation of colour change . 9
7.2 Determination of the carbonation depth . 10
7.2.1 General . 10
7.2.2 Measuring the depth of carbonation . 10
7.2.3 Appreciation of dense aggregates . 10
7.2.4 Appreciation of pores and porous aggregates and extreme values . 10
8 Determination of the rate of carbonation . 10
9 Test report . 11
10 Precision . 12
Annex A (informative) Guidance on suitable climate controlled chambers . 14
Annex B (informative) Guidance on natural exposure sites . 18
Bibliography . 20

European foreword
This document (prEN 12390-10:2025) has been prepared by Technical Committee CEN/TC 104
“Concrete and related products”,”, the secretariat of which is held by SN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12390-10:2018.
EN 12390-10:2018:
— The scope has been updated in order to account for slowly reacting binders.
The EN 12390 series, under the general title Testing hardened concrete, consists of the following parts:
— Part 1: Shape, dimensions and other requirements for specimens and moulds
— Part 2: Making and curing specimens for strength tests
— Part 3: Compressive strength of test specimens
— Part 4: Compressive strength - Specification for testing machines
— Part 5: Flexural strength of test specimens
— Part 6: Tensile splitting strength of test specimens
— Part 7: Density of hardened concrete
— Part 8: Depth of penetration of water under pressure
— Part 9: Freeze–thaw resistance with de-icing salts - Scaling (Technical Specification)
— Part 10: Determination of the carbonation resistance of concrete at atmospheric levels of carbon
dioxide
— Part 11: Determination of the chloride resistance of concrete, unidirectional diffusion
— Pert 12: Determination of the carbonation resistance of concrete – Accelerated carbonation method
— Part 13: Determination of the secant modulus of elasticity in compression
— Part 14: Semi-adiabatic method for the determination of heat released by concrete during its
hardening process
— Part 15: Adiabatic method for the determination of heat released by concrete during its hardening
process
— Part 16: Determination of the shrinkage of concrete
— Part 17: Determination of creep of concrete in compression
— Part 18: Determination of the chloride migration coefficient
— Part 19: Determination of electrical resistivity
Introduction
In reinforced and prestressed concrete structures, a sufficient concrete cover protects conventional
steel reinforcement from corrosion and contributes to ensure that the intended working life is achieved.
Reinforcement corrosion induced by carbonation can play a significant role in a structure’s
serviceability and consequently carbonation resistance of concrete, in particular of the cover zone, is an
important property to be quantified.
This document describes a test method for the quantification of the carbonation rate of any freshly cast
concrete. This document quantifies concrete behaviour in the conditions of carbonation at natural
levels of carbon dioxide. For standardization purposes, the carbon dioxide concentration in the climate
controlled chamber is fixed at 400 ppm, which is an increase of 50 ppm over the value used in the
previous version of this document. However, atmospheric levels of carbon dioxide are not constant in
location or time, and in some urban and industrial areas, carbon dioxide concentration exceeds
400 ppm.
From a European perspective, it makes sense to have common test procedures and common assessment
procedures, but with various possible purposes.
One of the intended applications of this document is the comparison of concrete mixtures, and in
particular the assessment of the impact of a change of constituent, e.g. cement type, addition, or the
impact of a change in mix proportions, e.g. w/c ratio, cement content, fines content. Such a comparison,
is also carried out when assessing the durability performance, and more precisely the ‘equivalent
durability’ with respect to carbonation, of a concrete, with unknown carbonation resistance or of a
concrete with one or more unfamiliar constituents. CEN/TR 16563 sets out basic principles to be
followed by 'equivalent durability' procedures.
In addition, this document provides parameters used in the classification of concrete on the basis of its
carbonation resistance.
Moreover, the rate of carbonation, as determined by the described test procedure, is used in some
models that estimate the start of reinforcement corrosion.
As this document provides test procedures, it only describes the production of standardized test
results; how these test results are used is not within the scope of this document.
1 Scope
This document specifies a method of determining the carbonation rate of a concrete, expressed in
mm/√a.
This document establishes a procedure where a standardized climate controlled chamber is used and
where specimens are placed on a natural exposure site protected from direct rainfall. The standardized
climate controlled chamber procedure is the reference method.
These procedures are applicable for the initial testing of concrete, including those manufactured with
slowly reacting binders, provided that the ages at which the carbonation depth is measured, the number
of measurements required to calculate the carbonation rate, as well as the length of exposure to CO , are
appropriately selected, as described in this document.
These procedures are not applicable for factory production control.
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 12390-1, Testing hardened concrete — Part 1: Shape, dimensions and other requirements for
specimens and moulds
EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests
EN 12390-3, Testing hardened concrete — Part 3: Compressive strength of test specimens
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Principle
Pairs of beams of concrete (or two cubes per test age) from the same batch of concrete are stored in a
climate controlled chamber as specified in 5.4 or on a natural exposure site as specified in 5.5. After
defined periods of exposure, an approximately 50 mm thick slice of the beam is broken off at each test
age and tested for its carbonation depth. If cubes are being used, they are broken in half and one half of
each cube is used to measure the carbonation depth, the other half being discarded.
The carbonation depth is measured at three locations on each face of each beam/cube giving a potential
total of 12 measurements per specimen and potentially 24 measurements for the two specimens. The
mean carbonation depth of all measurements is calculated. The remains of the beams are returned to
the climate controlled chamber for testing at other pre-defined ages. Using at least three sets of
measurements taken at 3 months, 6 months and 1 year, the rate of carbonation expressed as mm/√a is
determined.
5 Reagents and apparatus
5.1 A solution of 1 g
...