SIST-TS CEN/TS 12697-52:2025

SLOVENSKI STANDARD
01-julij-2025
Nadomešča:
SIST EN 12697-52:2017
Bitumenske zmesi - Preskusne metode - 52. del: Kondicioniranje za zagotovitev
oksidativnega staranja
Bituminous mixtures - Test methods - Part 52: Conditioning to address oxidative ageing
Asphalt - Prüfverfahren - Teil 52: Konditionierung zur Ansprache der oxidativen Alterung
Mélange bitumineux - Méthodes d'essai - Partie 52 : Conditionné pour traiter le
vieillissement oxydatif
Ta slovenski standard je istoveten z: CEN/TS 12697-52:2025
ICS:
93.080.20 Materiali za gradnjo cest Road construction materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 12697-52
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
May 2025
TECHNISCHE SPEZIFIKATION
ICS 93.080.20 Supersedes CEN/TS 12697-52:2017
English Version
Bituminous mixtures - Test methods - Part 52:
Conditioning to address oxidative ageing
Mélanges bitumineux - Méthodes d'essai - Partie 52 : Asphalt - Prüfverfahren - Teil 52: Konditionierung zur
Conditionnement pour l'obtention d'un vieillissement Ansprache der oxidativen Alterung
par oxydation
This Technical Specification (CEN/TS) was approved by CEN on 10 February 2025 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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.
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. CEN/TS 12697-52:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Procedure A — Conditioning of loose asphalt mixture . 6
5.1 Apparatus . 6
5.2 Procedure. 7
5.2.1 General . 7
5.2.2 Conditioning for short-term ageing potential (Procedure A.1) . 7
5.2.3 Conditioning for long-term ageing potential (Procedure A.2) . 7
5.3 Test report . 8
6 Procedure B — Conditioning of compacted asphalt mixture specimens . 9
6.1 Apparatus . 9
6.2 Conditioning at ambient air (Procedure B.1) . 10
6.2.1 Procedure. 10
6.2.2 Test report . 11
6.3 Conditioning under forced flow with gaseous oxidant (Procedure B.2) . 11
6.3.1 Procedure. 11
6.3.2 Test report . 13
Bibliography . 15

European foreword
This document (CEN/TS 12697-52:2025) has been prepared by Technical Committee CEN/TC 227 “Road
material”, the secretariat of which is held by BSI.
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.
This document supersedes CEN/TS 12697-52:2017.
CEN/TS 12697-52:2017:
— general editorial update according to current standard template and CEN/CENELEC Internal
Regulations, Part 3:2019;
— [2] deletion of “for hot mix asphalt” in titles of occurring test methods in EN 12697-series;
— [2] addition of EN 1427, EN 12607-1 and EN 14769;
— [3] update of Terms and definitions;
— [5.1.2], [5.1.3], [5.1.4] and [5.1.5] updated wording regarding the maximum permissible error;
— [5.1.2] introduction of explanatory NOTE 1 regarding the use of device when condition loose mixture;
— [5.2.2] previous Clause with title “Preparation” including text deleted;
— [5.2.2] change of title to read “Conditioning for short-term ageing potential (Procedure A.1);
— [5.2.2] clarification of paragraph that preparation of mixture is only valid for short-term ageing;
— [5.2.2] correction of thickness of the loose mix and addition of interval for stirring the mixture;
— [5.2.3] change of title to read “Conditioning for long-term ageing potential (Procedure A.2);
— [5.2.3] clarification regarding the preparation of mixture for long-term ageing and information of the
potential further analysis of mixtures after conditioning;
— [5.3] update of the contents in the test report;
— [6.1] updated wording regarding the maximum permissible error in relevant subclauses;
— [6.2.1] introduction of explanatory NOTE regarding the impact of re-heating of asphalt mixture;
— [6.2.2] update of the contents in the test report;
— [6.3.1] addition of specification of material for the tubing;
— [6.3.2] update of the contents in the test report.
A list of all parts in the EN 12697 series can be found on the CEN website.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: 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 the
United Kingdom.
1 Scope
This document specifies two sets of procedures for conditioning of bituminous mixtures in terms of
oxidative ageing. Procedures A.1 and A.2 can be applied on loose bituminous mixture before compaction
of specimens, procedures B.1 and B.2 on compacted specimens.
Material conditioned by this document can be used for further testing to assess the effect of oxidative
ageing on characteristics of bituminous mixtures and thus on their durability and recyclability.
Alternatively, binder can be extracted from conditioned mixture to assess the effect of oxidative ageing
on binder characteristics taking into account potential effects of mineral aggregates on ageing.
This document is applicable to bituminous mixtures manufactured in the laboratory or in a mixing plant.
Procedures B.1 and B.2 are applicable to specimens from laboratory production or samples taken from
the field.
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 12697-5, Bituminous mixtures — Test methods — Part 5: Determination of the maximum density
EN 12697-6, Bituminous mixtures — Test methods — Part 6: Determination of bulk density of bituminous
specimens
EN 12697-8, Bituminous mixtures — Test methods — Part 8: Determination of void characteristics of
bituminous specimens
EN 12697-27, Bituminous mixtures — Test methods — Part 27: Sampling
EN 12697-29, Bituminous mixtures — Test methods — Part 29: Determination of the dimensions of a
bituminous specimen
EN 12697-30, Bituminous mixtures — Test methods — Part 30: Specimen preparation by impact compactor
EN 12697-31, Bituminous mixtures — Test methods — Part 31: Specimen preparation by gyratory
compactor
EN 12697-32, Bituminous mixtures — Test methods — Part 32: Specimen preparation by vibratory
compactor
EN 12697-33, Bituminous mixtures — Test methods — Part 33: Specimen prepared by roller compactor
EN 12697-35, Bituminous mixtures — Test methods — Part 35: Laboratory mixing
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
ageing
alteration of asphalt mixtures over time due to the superposed impact of different environmental
conditions (e.g. oxygen, other oxidation agents, UV and moisture) that lead to altering characteristics of
the binder, additive and aggregate component over time
Note 1 to entry: Changes in binder characteristics are mainly increasing stiffness and brittleness leading to
increased risk of low-temperature and fatigue cracking of asphalt mixtures. Impacts of fine and coarse aggregates
on the ageing behaviour of asphalt mixtures are still topic of scientific discussion. Ageing can be divided into short-
term ageing (STA) during production and compaction of asphalt mixtures and asphalt layers and into long-term
ageing (LTA) of compacted pavement layers over the years.
3.2
durability
maintenance of the structural integrity of compacted material over its expected service-life when
exposed to the effects of the environment (water, oxygen, sunlight,…) and traffic loading
4 Principle
One of two sets of methods is used for asphalt mixture conditioning. In the first set of methods
(Procedures A.1 and A.2), loose asphalt mixture is conditioned. The loose mixture is placed into a pan and
conditioned within a heating cabinet with forced air ventilation for a specific duration at elevated
temperature to accelerate ageing due to oxidation. Additionally pressure can be applied for further
acceleration of conditioning. Procedure A.1 address the short-term ageing potential, procedure A.2 the
long-term ageing potential.
In the second set of methods (Procedures B.1 and B.2) compacted specimens from bituminous mixtures
prepared in the laboratory or coming from the plant or samples from the field are conditioned. Two
options for conditioning are available. Either specimens are placed into a pan and conditioned within a
heating cabinet with forced air ventilation for a specific duration at a specific temperature (Procedure
B.1), or specimens are placed within a triaxial cell (comparable to triaxial cells used for permeability tests
on soils) and a forced flow of gaseous oxidant agent (ozone enriched compressed air) through the
specimen is used to condition the specimen for a specific duration at a specific temperature (Procedure
B.2).
NOTE Methods B.1 and B.2 result in different results in subsequent testing of conditioned specimens or
extracted binder.
5 Procedure A — Conditioning of loose asphalt mixture
5.1 Apparatus
5.1.1 One or more pans, with dimensions large enough to ensure that the loose mixture can be spread
on it with a thickness of the mixture of up to 60 mm.
To increase the oxidative ageing effect by enhanced air flow through the mixture, a pan with a perforated
plate with a maximum mesh size of 0,7 mm can be applied.
5.1.2 Heating cabinet, with forced air ventilation able to maintain the conditioning temperature with
a maximum permissible error of 5 °C and a maximum deviation of ± 1°C in the vicinity of the sample.
5.1.3 Thermometer, capable of measuring temperatures from room temperature to 180 °C, readable
to 1 °C with a maximum permissible error of 0.5 °C.
5.1.4 Watch or timer, readable to 1 min and with a maximum permissible error of 1 min.
5.1.5 A device, able to maintain the conditioning temperature and pressure with a maximum
permissible error of 1 °C for the temperature and of 100 kPa for the pressure.
NOTE 1 The device is used when conditioning a loose mixture under temperature and pressure.
NOTE 2 The pressure ageing vessel (PAV) as described in EN 14769 meets the requirements for conditioning of
loose mixture under temperature and pressure.
5.2 Procedure
5.2.1 General
Procedure A.1 (for short-term ageing) shall not be applied on loose mix coming from the field as this step
has already been taken in the mixing plant.
5.2.2 Conditioning for short-term ageing potential (Procedure A.1)
Prepare the bituminous mixture according to EN 12697-35.
Preheat the device in which the mixture is to be conditioned and the pan to the conditioning temperature
for at least 60 min.
Fill the loose mixture into the pan and spread it so that a homogeneous layer of mixture with a thickness
of (25 ± 5) mm is in the pan. Before placing the pan in the conditioning device, allow the mixture to cool
down to the set conditioning temperature. Use the thermometer to check the mixture temperature
regularly. When the mixture has reached the conditioning temperature, place the pan into the
conditioning device. Condition the mixture at the specified temperature and pressure for the set
conditioning time ± 10 min.
To reduce the danger of binder drainage, it is recommended to carry out preliminary tests according to
EN 12697-18 at the desired conditioning temperature to analyse whether binder drainage occurs. If so,
lower the temperature until no binder drainage occurs.
To maintain a uniform conditioning it is recommended to stir the mixture at regular time intervals so as
to avoid segregation, e.g. each 1 h.
NOTE The method for short-term ageing of laboratory prepared asphalt mixtures suggested by SHRP-A-383
[1] report sets a conditioning temperature of 135 °C for 4 h.
After conditioning:
— the mixture is compacted to specimens according to EN 12697-30, EN 12697-31, EN 12697-32, or
EN 12697-33 for testing of mixture characteristics after conditioning; or
— the binder is extracted from the mixture according to EN 12697-3 or EN 12697−4 for testing of
binder characteristics after mixture conditioning.
— the mixture is further conditioned for long-term ageing according to 5.2.3.
5.2.3 Conditioning for long-term ageing potential (Procedure A.2)
Only mixture prepared in the laboratory and conditioned according to 5.2.3 (short-term ageing) or
mixture coming from a mixing plant shall be further conditioned to long-term ageing as described within
this clause.
Preheat the device in which the mixture is to be conditioned and the pan to the conditioning temperature
for at least 60 min. Fill the loose mixture into the pan and spread it so that a homogeneous layer of
mixture with a thickness of (25 ± 5) mm is in the pan. In case mixture needs to be reheated for placing it
into th
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