SIST EN 12390-12:2020

Testing hardened concrete - Part 12: Determination of the carbonation resistance of concrete - Accelerated carbonation method

This procedure is a method for evaluating the carbonation resistance of concrete using test conditions that accelerate the rate of carbonation. After a period of preconditioning, the test is carried out under controlled exposure conditions using an increased level of carbon dioxide.
NOTE   The test under reference conditions takes a minimum of 112 days comprising a minimum age of the specimen prior to conditioning of 28 days, a minimum conditioning period of 14 days and an exposure to increased carbon dioxide levels of 70 days.
This procedure is not a method for the determination of carbonation depths in existing concrete structures.

Prüfung von Festbeton - Teil 12: Bestimmung des Karbonatisierungswiderstandes von Beton - Beschleunigtes Karbonatisierungsverfahren

Dieses Verfahren repräsentiert eine Methode für die Beurteilung des Karbonatisierungswiderstandes von Beton unter solchen Prüfbedingungen, die die Karbonatisierungsgeschwindigkeit beschleunigen. Nach einer Vorbehandlungsphase wird die Prüfung unter geregelten Bedingungen in Form der Beanspruchung durch eine erhöhte Kohlenstoffdioxidkonzentration in der Umgebungsluft durchgeführt.
ANMERKUNG   Unter Referenzbedingungen dauert diese Prüfung mindestens 112 Tage, wobei diese Zeitspanne die mindestens 28 tägige Alterung des Probekörpers vor der Klimatisierung, seine mindestens 14 Tage dauernde Klimatisierung und seine 70 tägige Beanspruchung durch erhöhte Kohlenstoffdioxidkonzentrationen umfasst.
Dieses Verfahren eignet sich nicht zur Bestimmung der Karbonatisierungstiefen in bereits bestehenden Betontragwerken.

Essais pour béton durci - Partie 12 : Détermination de la résistance à la carbonatation du béton - Méthode de la carbonatation accélérée

Le présent mode opératoire est une méthode pour l’évaluation de la résistance à la carbonatation d’un béton en utilisant des conditions d’essai qui accélèrent la vitesse de carbonatation. Après une période de préconditionnement, l’essai est réalisé dans des conditions d’exposition contrôlées avec une teneur plus élevée en dioxyde de carbone.
NOTE   L’essai dans les conditions de référence nécessite au minimum 112 jours, l’âge minimal de l’éprouvette avant le conditionnement étant de 28 jours, plus une période minimale de conditionnement de 14 jours et une exposition de 70 jours à des teneurs élevées en dioxyde de carbone.
Ce mode opératoire ne permet pas de déterminer la profondeur de carbonatation des structures en béton existantes.

Preskušanje strjenega betona - 12. del: Določanje odpornosti proti karbonatizaciji betona - Metoda pospešene karbonatizacije

General Information

• Status: Published
• Public Enquiry End Date: 09-Dec-2018
• Publication Date: 11-Mar-2020
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: BBB - Concrete, reinforced concrete and prestressed concrete
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Feb-2020
• Due Date: 12-Apr-2020
• Completion Date: 12-Mar-2020
• Ref Project: EN 12390-12:2020 - Testing hardened concrete - Part 12: Determination of the carbonation resistance of concrete - Accelerated carbonation method

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 12390-12:2020
01-april-2020

Preskušanje strjenega betona - 12. del: Določanje odpornosti proti karbonatizaciji

betona - Metoda pospešene karbonatizacije

Testing hardened concrete - Part 12: Determination of the carbonation resistance of

concrete - Accelerated carbonation method

Prüfung von Festbeton - Teil 12: Bestimmung des Karbonatisierungswiderstandes von

Beton - Beschleunigtes Karbonatisierungsverfahren

Essais pour béton durci - Partie 12 : Détermination de la résistance à la carbonatation du

béton - Méthode de la carbonatation accélérée
Ta slovenski standard je istoveten z: EN 12390-12:2020
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
SIST EN 12390-12:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 12390-12:2020
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SIST EN 12390-12:2020
EN 12390-12
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 91.100.30
English Version
Testing hardened concrete - Part 12: Determination of the
carbonation resistance of concrete - Accelerated
carbonation method

Essais pour béton durci - Partie 12 : Détermination de Prüfung von Festbeton - Teil 12: Bestimmung des

la résistance à la carbonatation du béton - Méthode de Karbonatisierungswiderstandes von Beton -

la carbonatation accélérée Beschleunigtes Karbonatisierungsverfahren
This European Standard was approved by CEN on 4 November 2019.

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. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists 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, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12390-12:2020 E

worldwide for CEN national Members.
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SIST EN 12390-12:2020
EN 12390-12:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 Principle ............................................................................................................................................................. 7

5 Reagents and apparatus ............................................................................................................................... 8

6 Production of concrete specimens ............................................................................................................ 9

6.1 General ................................................................................................................................................................ 9

6.2 Making and testing concrete specimens ................................................................................................. 9

7 Carbonation depth measurements ........................................................................................................ 10

8 Determination of the carbonation depth ............................................................................................ 10

8.1 General ............................................................................................................................................................. 10

8.2 Measuring the depth of carbonation on each test specimen ........................................................ 11

8.3 Appreciation of dense aggregates .......................................................................................................... 11

8.4 Appreciation of pores and porous aggregates and extreme values ........................................... 11

8.5 Expression of the Results .......................................................................................................................... 11

9 Test Report ..................................................................................................................................................... 12

10 Precision estimate ....................................................................................................................................... 13

Annex A (informative) Guidance on storage chambers ............................................................................... 15

Bibliography ................................................................................................................................................................. 18

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SIST EN 12390-12:2020
EN 12390-12:2020 (E)
European foreword

This document (EN 12390-12:2020) has been prepared by Technical Committee CEN/TC 104 “Concrete

and related products”, the secretariat of which is held by SN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by July 2020, and conflicting national standards shall be

withdrawn at the latest by July 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

The series EN 12390, Testing hardened concrete, includes 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

— 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 (in preparation)
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EN 12390-12:2020 (E)
— Part uu: Determination of resistivity

— Part zz: Determination of the carbonation rate of concrete under test conditions that accelerate

carbonation ·

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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, Turkey and the United

Kingdom.
Under development.
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SIST EN 12390-12:2020
EN 12390-12:2020 (E)
Introduction

Reinforced concrete structures need to be durable to ensure that the intended working life is achieved.

The resistance to corrosion of reinforcement induced by carbonation plays a significant role in a

structure’s serviceability and consequently carbonation behaviour of concrete is an important property

to measure. This document specifies an accelerated test method that could be applied to cast test

specimens to assess the carbonation behaviour of a concrete mix.
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SIST EN 12390-12:2020
EN 12390-12:2020 (E)
1 Scope

This document quantifies the carbonation resistance of concrete using test conditions that accelerate the

rate of carbonation. After a period of preconditioning, the test is carried out under controlled exposure

conditions using an increased level of carbon dioxide.

NOTE The test performed under reference conditions takes a minimum of 112 days comprising a minimum

age of the specimen prior to curing under water of 28 days, a minimum preconditioning period of 14 days and an

exposure period to increased carbon dioxide levels of 70 days.

This procedure is not a method for the determination of carbonation depths in existing concrete

structures.
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 12350-2, Testing fresh concrete — Part 2: Slump test
EN 12350-3, Testing fresh concrete — Part 3: Vebe test
EN 12350-4, Testing fresh concrete — Part 4: Degree of compactability
EN 12350-5, Testing fresh concrete — Part 5: Flow table test

EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
carbonation rate

average rate at which the carbonation front penetrates concrete expressed as mm/√(days)

Note 1 to entry: The carbonation rate will vary depending upon the test curing, preconditioning or exposure

conditions and therefore any carbonation rate has to be qualified by the conditions under which it was obtained.

The abbreviation ‘K ’ is the carbonation rate under the test conditions specified in this document.

3.2
depth of carbonation

depth as measured using a phenolphthalein solution or an alternative indicator that results in a colour

change in the range of pH 8 to pH 11 on the freshly-split concrete surface
3.3
effective time

time in days spent in the storage chamber with the concrete specimens continually exposed to carbon

dioxide
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EN 12390-12:2020 (E)
3.4
mean carbonation depth
mean depth of carbonation of two specimens
3.5
single point carbonation depth
k, point
depth of carbonation recorded for a single point on a specimen

Note 1 to entry: This is the measured depth of carbonation except where the measurement point coincides with

a dense particle, porous particle or void, see 8.3 and 8.4.
3.6
specimen carbonation depth
k, spec
mean depth of carbonation of a single specimen
3.7
specimen face carbonation depth
k, face
mean depth of carbonation of a single exposed face of a single specimen
4 Principle

2 concrete prisms, 8 concrete cubes or 5 concrete cylinders are cast and thereupon cured for 28 days in

accordance with EN 12390-2. The test specimens are then conditioned in a laboratory air environment

for 14 days and then placed in a storage chamber with a carbon dioxide concentration within the storage

chamber in percent by volume of (3,0 ± 0,5) % when the storage chamber is at normal conditions (1 013

mbar at 25°C) , temperature (20 ± 2) °C and relative humidity (57 ± 3) % for periods of up to 70 days.

Immediately prior to placing specimens in the storage chamber and after prescribed ages corresponding

to 7, 28 and 70 days of storage in the chamber (this gives approximately equidistant values of √days), 2

of the cubes are split in half; 1 cylinder is split in half along its vertical axis and a 50 mm slice is split from

each of the prisms and the depths of carbonation measured.

On one half of each cylinder or each slice of prism or on one half of each cube, twelve single point

carbonation depths (d ) are measured after each exposure period and the depth of carbonation d ,

k,point k

at that exposure time is expressed as the mean of the two test specimens. Using measurements taken at

the fixed times, the carbonation rate expressed as mm/√days is determined.
CO concentration can vary with with altitude above the sea level.
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5 Reagents and apparatus

A solution of 0,8 g of phenolphthalein powder dissolved in a solution of 70 ml ethanol and 30 ml of

deionised water or a suitable alternative indicator giving a colour change in the range pH 8 to 11 that

gives a sufficiently clear colour change in concrete to differentiate the neutralized zone, e.g.

thymolphthalein

WARNING — Phenolphthalein is listed in REACH appendix 2 and its lists of substances of very high

concern. Phenolphthalein powder should be handled with the greatest care using safety gloves in a fume

cupboard fitted with an extractor.

Where needed, a fixing solution to permanently fix the colour change in the concrete specimen, see

Clause 7.

NOTE 1 Suppliers of some indicator solutions also provide a fixing solution that permanently fixes the colour

change.
A magnifier and a gauge with a precision of 0,5 mm.

A storage chamber with a carbon dioxide concentration within the storage chamber in percent by volume

as indicated in Clause 4, temperature at (20 ± 2) °C and a relative humidity at (57 ± 3) %, see Annex A

(informative) for details of a suitable chamber. The carbon dioxide concentration shall be within ± 0,5 %

by volume of the target value with no variation for longer than 4 h outside the target value ± 1,0 %.

NOTE 2 Experience [5] has shown that if saturated surface-dry specimens are placed in the storage chamber

shortly after removal from water curing, the relative humidity can exceed that permitted. Also, without active

control of the carbon dioxide concentration, the levels can drop below the permitted tolerance as the carbonation

process continues. Therefore, it is important that the storage chamber has active control on carbon dioxide

concentration, relative humidity and temperature.

NOTE 3 Relative humidity levels can be maintained using methods at the discretion of the laboratory, for

example active humidification/dehumidification.

NOTE 4 When the door of the storage chamber is opened, the carbon dioxide concentration within the chamber

can fall rapidly, and therefore, for practical reasons, a short period of low carbon dioxide concentration is

acceptable. The cumulative periods of times of low carbon dioxide concentration cannot exceed 4 % of the storage

time of 63 days. The relative carbon dioxide concentration is expected to be within ± 0,1 % by volume of the target

value during 96 % of the storage time in the carbonation chamber

Apparatus for recording the relative humidity with a maximum permissible measurement error

of ± 3,0 % and the temperature with a maximum permissible measurement error of ± 0,5 °C.

Apparatus for recording CO concentration with a maximum permissible measurement error of ± 0,1 %

by volume.

NOTE 5 The recording apparatus can be fitted with an audio/visual/email or other suitable alarm to alert

breaches of CO concentration within the storage chamber due to possible apparatus malfunction

...