oSIST prEN 12607-1:2023
(Main)Bitumen and bituminous binders - Determination of the resistance to hardening under influence of heat and air - Part 1: RTFOT method
Bitumen and bituminous binders - Determination of the resistance to hardening under influence of heat and air - Part 1: RTFOT method
This part of EN 12607 specifies a method for measuring the combined effects of heat and air on a thin moving film of bitumen or bituminous binder simulating the hardening which most bituminous binders undergo during mixing in an asphalt mixing plant.
The method described is not applicable to some modified binders or to those where the viscosity is too high to provide a moving film. In some cases the sample may creep out of the glass container and flow on the heating elements of the oven during testing. The method is suitable for other bituminous binders than paving grade bitumen, but the reference temperature might give excessive hardening that do not resemble real conditions during mixing at the plant. The method may not represent the hardening that occurs during mixing of warm mix binders.
The method is referred to as RTFOT, i.e. Rolling Thin Film Oven Test.
WARNING - Use of this European Standard can involve hazardous materials, operations and equipment. This European Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this European Standard to identify the hazards and assess the risks involved in performing this test method and to implement sufficient control measures to protect individual operators (and the environment). This includes appropriate safety and health practices and determination of the applicability of regulatory limitations prior to use.
If there is a likelihood of volatile components being present in a binder, this procedure should not be used. It should not be used for cutback bitumen or bituminous emulsions before these products have been stabilized, e.g. in accordance with EN 13074 2.
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Beständigkeit gegen Verhärtung unter Einfluss von Wärme und Luft - Teil 1: RTFOT-Verfahren
Bitumes et liants bitumineux - Détermination de la résistance au durcissement sous l'effet de la chaleur et de l'air - Partie 1 : Méthode RTFOT
Bitumen in bitumenska veziva - Določanje odpornosti proti otrjevanju pod vplivom toplote in zraka - 1. del: Metoda RTFOT
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12607-1:2023
01-junij-2023
Bitumen in bitumenska veziva - Določanje odpornosti proti otrjevanju pod vplivom
toplote in zraka - 1. del: Metoda RTFOT
Bitumen and bituminous binders - Determination of the resistance to hardening under
influence of heat and air - Part 1: RTFOT method
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Beständigkeit gegen
Verhärtung unter Einfluss von Wärme und Luft - Teil 1: RTFOT-Verfahren
Bitumes et liants bitumineux - Détermination de la résistance au durcissement sous
l'effet de la chaleur et de l'air - Partie 1 : Méthode RTFOT
Ta slovenski standard je istoveten z: prEN 12607-1
ICS:
75.140 Voski, bitumni in drugi naftni Waxes, bituminous materials
proizvodi and other petroleum products
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
oSIST prEN 12607-1:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12607-1:2023
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oSIST prEN 12607-1:2023
DRAFT
EUROPEAN STANDARD
prEN 12607-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2023
ICS Will supersede EN 12607-1:2014
English Version
Bitumen and bituminous binders - Determination of the
resistance to hardening under influence of heat and air -
Part 1: RTFOT method
Bitumes et liants bitumineux - Détermination de la Bitumen und bitumenhaltige Bindemittel -
résistance au durcissement sous l'effet de la chaleur et Bestimmung der Beständigkeit gegen Verhärtung unter
de l'air - Partie 1 : Méthode RTFOT Einfluss von Wärme und Luft - Teil 1: RTFOT-
Verfahren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 336.
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 12607-1:2023 E
worldwide for CEN national Members.
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prEN 12607-1:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 5
5 Apparatus . 5
6 Sampling . 10
6.1 General. 10
6.2 Test sample preparation . 10
7 Procedure . 10
7.1 Test conditions . 10
7.2 Determination and measurement . 10
7.3 Measurement . 11
8 Calculation . 11
9 Expression of results . 12
10 Precision . 12
10.1 Repeatability . 12
10.2 Reproducibility . 12
11 Test report . 13
Annex A (informative) Characteristics of thermometer . 14
Annex B (informative) Temperature homogeneity verification in RTFOT oven . 15
Bibliography . 18
2
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oSIST prEN 12607-1:2023
prEN 12607-1:2023 (E)
European foreword
This document (prEN 12607-1:2023) has been prepared by Technical Committee CEN/TC 336
“Bituminous binders”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12607-1:2014.
Compared to the previous edition the main technical changes are:
a) reference duration of procedure was added in Clause 4;
b) Clause 4 was updated by removing limitation to test following the RTFOT procedure to those listed;
c) reference to new informative Annex B was made in 5.1;
d) amendments were made on temperature control and verification in 5.1 and in the new informative
Annex B;
e) a complementary drawing to Figure 3 in Clause 5 was added to show concave glass containers and
renamed into Figure 3 a) and Figure 3 b) and a second note was added to 5.4;
f) Clause 6 was aligned with draft revised EN 12594;
g) 6.3 was removed;
h) Clause 8 was editorially updated;
i) a new informative Annex B on temperature verification was added.
EN 12607, Bitumen and bituminous binders — Determination of the resistance to hardening under the
influence of heat and air, is currently composed with the following parts:
— Part 1: RTFOT method
— Part 2: TFOT method
— Part 3: RFT method
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oSIST prEN 12607-1:2023
prEN 12607-1:2023 (E)
1 Scope
This document specifies a method for measuring the combined effects of heat and air on a thin moving
film of bitumen or bituminous binder simulating the hardening which most bituminous binders
undergo during mixing in an asphalt mixing plant.
The method described is not applicable to some modified binders or to those where the viscosity does
not allow to provide a moving film. In some cases, the sample may creep out of the glass container and
flow on the heating elements of the oven during testing. The method is suitable for other bituminous
binders than paving grade bitumen, but the reference temperature might give excessive hardening that
do not resemble real conditions during mixing at the plant. The method may not represent the
hardening that occurs during mixing of warm mix binders.
The method is referred to as RTFOT, i.e. Rolling Thin Film Oven Test.
WARNING — Use of this document can involve hazardous materials, operations and equipment. This document
does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of
this document to identify the hazards and assess the risks involved in performing this test method and to
implement sufficient control measures to protect individual operators (and the environment). This includes
appropriate safety and health practices and determination of the applicability of regulatory limitations prior to
use.
If there is a likelihood of volatile components being present in a binder, this procedure should not be
used. It should not be used for cutback bitumen or bituminous emulsions before these products have
been stabilized, e.g. in accordance with EN 13074-2.
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 58, Bitumen and bituminous binders - Sampling bituminous binders
EN 1426, Bitumen and bituminous binders - Determination of needle penetration
EN 1427, Bitumen and bituminous binders - Determination of the softening point - Ring and Ball method
EN 12594, Bitumen and bituminous binders - Preparation of test samples
EN 12596, Bitumen and bituminous binders - Determination of dynamic viscosity by vacuum capillary
EN 13302, Bitumen and bituminous binders - Determination of dynamic viscosity of bituminous binder
using a rotating spindle apparatus
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:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
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prEN 12607-1:2023 (E)
4 Principle
A moving film of bituminous binder is heated in an oven to a specified temperature for a given period of
time with a constant supply of air.
The effects of heat and air are determined based on the change in mass (expressed as a percentage) or
on the change in the bituminous binder’s characteristics such as penetration according to EN 1426,
softening point according to EN 1427 or dynamic viscosity according to EN 12596 or EN 13302, and
other tests before and after the period in the oven.
The reference temperature of this conditioning is 163 °C and the reference duration is 75 min.
5 Apparatus
Usual laboratory apparatus and glassware, together with the following:
5.1 Oven, rectangular, double-walled and electrically heated. The inside dimensions excluding the air
plenum shall be as follows:
— height: (340 ± 15) mm;
— width: (405 ± 15) mm;
— depth: (445 ± 15) mm.
The front door shall contain a symmetrically located window of the following dimensions:
— width: (320 ± 15) mm;
— height: (215 ± 15) mm.
This window shall contain two sheets of heat resistant glass separated by an air space. The window
shall permit an unobstructed view of the interior of the oven.
The top of the upper heating element shall be (25 ± 9) mm below the oven floor.
The oven shall be ventilated by convection currents of air; the oven shall have air inlets and outlets for
the evacuation of hot gases. The air inlets toward the bottom of the oven shall be located so that the air
2
is able to flow around the heating elements and their total open area shall be (1 500 ± 100) mm . The
outlets for the hot gases evacuation shall be located in the upper part of the oven and their total open
2
area shall be (1 000 ± 100) mm .
The oven shall incorporate an air flow around the side walls and ceiling. The air plenum (between the
wall and the sheaths) shall be of uniform thickness (38 ± 3) mm [Figure 1 a)]. The inside of the oven
shall be equipped with a vertical circular aluminium carriage with a diameter of (300 ± 10) mm
[Figure 2 a)]. The horizontal axis of the circular carriage is located (160 ± 10) mm from the upper inside
wall of the oven, excluding the air plenum. The carriage shall be provided with suitable openings and
spring clips for firmly holding eight glass containers in a horizontal position [Figure 2 b)]. The carriage
shall be mechanically driven by a 20 mm diameter shaft and shall make 15 turns within (60 ± 1) s. The
front surface of the carriage shall be (110 ± 5) mm from the rear inside wall of the oven.
On the upper surface and at the midpoint of the width of the oven and (150 ± 5) mm from the front face
of the carriage, a squirrel cage-type fan shall be mounted with an outside diameter of (135 ± 5) mm and
a thickness of (75 ± 5) mm and turned at (1 725 ± 100) r/min by an externally mounted motor.
The fan shall be set so that it turns in an opposite direction to its vanes. The air flow characteristics shall
be suction from the floor of the oven then flow along the walls in the sheaths fitted for this purpose and
exhaust at the upper surface through the fan [Figure 1 a) and Figure 1 b)].
5
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prEN 12607-1:2023 (E)
The oven shall be equipped with a thermostat capable of maintaining a constant temperature to ± 0,5 °C
throughout the entire periphery of the vertical circular carriage. The corresponding regulation probe
shall be situated on the right side of the oven as described in Figure 1 or symmetrically on the left side.
The temperature shall be recorded inside the oven with the reading point (25 ± 5) mm below a
horizontal line through the axle of the carriage, (50 ± 5) mm from the inside wall and (115 ± 5) mm
from the front face of the carriage. The heating capacity shall be sufficient to bring the oven back to the
test temperature within a 10 min period after insertion of the containers.
The oven shall be equipped with an air jet positioned to blow heated air into each container at its lowest
point of travel. The air jet shall have an outlet orifice with a diameter of (1,0 ± 0,1) mm connected to a
copper tubing (see EN 12735-1) with an external diameter of (8,0 ± 0,1) mm and a length of
(7,60 ± 0,05) m. This tube shall be coiled to lie flat on the bottom of the oven and lead to a source of oil-
free, dried and dust-free air. The orifice of the tubing shall be between 5 mm and 10 mm from the
opening in the glass container. The air jet shall blow along the main axis of the glass container.
NOTE Activated silica gel treated with an indicator is a satisfactory desiccant for the air.
The equipment (particularly the circular carriage rotation/fan rotation speed, the homogeneity of
temperature in the oven as well as the accuracy of the temperature control system) should be
calibrated at regular intervals in accordance with the quality assurance procedure of the laboratory, at
least once per year, and verified as described in the equipment manufacturers handbook. Action should
be taken if it does not comply with the requirements stated in this method. Annex B gives information
and describes a method to check the temperature uniformity in the working space of the circular
carriage.
5.2 Flow meter, capable of measuring the airflow at a rate of (4,0 ± 0,2) l/min at ambient
temperature and pressure.
5.3 Temperature measuring device
A temperature measuring device (combining sensor and reading unit) that shall:
— have a range from at least 150 °C to 200 °C;
— be readable to 0,1 °C or less;
— have a maximum permissible error of ± 0,5 °C or better.
Sensors based on platinum resistance thermometers have been found suitable but other principles are
also allowed. The thermal response time of the sensor shall be comparable with the former used
reference (see informative Annex A). The temperature measuring device shall be calibrated regularly.
When measuring and controlling nominally constant temperatures, as in this test method, the thermal
response time can be rather high (e.g. slow response to a change in temperature). Care shall be taken to
consider this aspect since low thermal response times of the sensor can indicate greater cyclic
variations than the bituminous material in practice experiences.
5.4 Glass containers, (in which the sample of bituminous binder is subjected to the test), made of
heat-resistant glass conforming t
...
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