prEN 14771

Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending Beam Rheometer (BBR)

This document specifies a method for the determination of the flexural creep stiffness of bituminous binders in the range of 30 MPa to 1 GPa by means of the bending beam rheometer.
WARNING - The use of this document may 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 document to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

Bitumen und bitumenhaltige Bindemittel - Bestimmung der Biegekriechsteifigkeit - Biegebalkenrheometer (BBR)

Dieses Dokument legt ein Verfahren zur Bestimmung der Biegekriechsteifigkeit von bitumenhaltigen Bindemitteln im Bereich von 30 MPa bis 1 GPa mit einem Biegebalkenrheometer fest.
WARNUNG - Die Anwendung dieses Dokuments kann den Umgang mit gefährlichen Substanzen und Ausrüstungsteilen und die Ausführung gefährlicher Arbeitsgänge einschließen. Diese Europäische Norm erhebt nicht den Anspruch, alle mit ihrer Anwendung verbundenen Sicherheitsprobleme anzusprechen. Es liegt in der Verantwortung des Anwenders dieses Dokuments, geeignete Verhaltensregeln für den Arbeits- und Gesundheitsschutz festzulegen und vor der Anwendung zu klären, ob einschränkende Vorschriften zu berücksichtigen sind.

Bitumes et liants bitumineux - Détermination du module de rigidité en flexion - Rhéomètre à flexion de barreau (BBR)

Le présent document spécifie une méthode permettant de déterminer le module de rigidité en flexion des liants bitumineux dans la plage de 30 MPa à 1 GPa au moyen d'un rhéomètre à flexion de barreau.
AVERTISSEMENT - L'utilisation de ce document peut impliquer l'intervention de produits, d'opérations et d'équipements à caractère dangereux. Le présent document n'est pas censé aborder tous les problèmes de sécurité concernés par son usage. Il incombe à son utilisateur d'établir des règles d'hygiène et de sécurité appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation.

Bitumen in bitumenska veziva - Ugotavljanje upogibne togosti - Reometer z nosilcem, obremenjenim na upogib (BBR)

General Information

• Status: Not Published
• Publication Date: 21-Dec-2023
• ICS: 75.140 - Waxes, bituminous materials and other petroleum products
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: CEN/TC 336 - Bituminous binders
• Drafting Committee: CEN/TC 336/WG 1 - Bituminous binders for paving
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 16-Dec-2022
• Due Date: 31-Dec-2022
• Completion Date: 16-Dec-2022
• Ref Project: oSIST prEN 14771:2022 - Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending Beam Rheometer (BBR)

Relations

• Revises: EN 14771:2012 - Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending Beam Rheometer (BBR)
• Effective Date: 05-Dec-2018

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 14771:2022
01-maj-2022
Bitumen in bitumenska veziva - Ugotavljanje upogibne togosti - Reometer z
nosilcem, obremenjenim na upogib (BBR)

Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending

Beam Rheometer (BBR)
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Biegekriechsteifigkeit -
Biegebalkenrheometer (BBR)
Bitumes et liants bitumineux - Détermination du module de rigidité en flexion -
Rhéomètre à flexion de barreau (BBR)
Ta slovenski standard je istoveten z: prEN 14771
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 14771:2022 en,fr,de

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

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oSIST prEN 14771:2022
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oSIST prEN 14771:2022
DRAFT
EUROPEAN STANDARD
prEN 14771
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2022
ICS 75.140; 91.100.50 Will supersede EN 14771:2012
English Version
Bitumen and bituminous binders - Determination of the
flexural creep stiffness - Bending Beam Rheometer (BBR)

Bitumes et liants bitumineux - Détermination du Bitumen und bitumenhaltige Bindemittel -

module de rigidité en flexion - Rhéomètre à flexion de Bestimmung der Biegekriechsteifigkeit -

barreau (BBR) Biegebalkenrheometer (BBR)

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, Turkey 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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14771:2022 E

worldwide for CEN national Members.
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oSIST prEN 14771:2022
prEN 14771:2022 (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 Preparation of test samples .............................................................................................................. 6

6.1 General...................................................................................................................................................... 6

6.2 Preparation of moulds ........................................................................................................................ 6

6.3 Preparation of test specimen ........................................................................................................... 7

7 Procedure ................................................................................................................................................ 7

7.1 Measurement .......................................................................................................................................... 7

7.2 Deflection in a valid determination ............................................................................................... 8

8 Calculation ............................................................................................................................................... 8

8.1 General...................................................................................................................................................... 8

8.2 Measured stiffness ................................................................................................................................ 9

8.3 Calculated stiffness ............................................................................................................................... 9

8.4 m-value ..................................................................................................................................................... 9

8.5 Validity of the results ........................................................................................................................ 10

9 Expression of results ......................................................................................................................... 10

10 Precision ................................................................................................................................................ 10

10.1 Repeatability, r .................................................................................................................................... 10

10.2 Reproducibility, R ............................................................................................................................... 10

11 Test report ............................................................................................................................................. 10

Annex A (informative) Calculation of T (S=300 MPa) and respective m-value ........................ 15

Annex B (informative) Calculation of ΔTc ............................................................................................... 17

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

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oSIST prEN 14771:2022
prEN 14771:2022 (E)
European foreword

This document (prEN 14771:2022) 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 14771:2012.
Compared to EN 14771:2012, the following changes have been made:
a) 5.1.1.1 reworded to provide more clarity;
b) 5.2.1 reworded to provide more clarity;
c) 6.1 Reference to scope added in note;
d) Description reworded to provide more clarity; timing of trimming adjusted;

e) 7.1 Information to discard damaged or distorted specimen added, and in c) wording aligned with

5.1.1.1;
f) Annex A added;
g) Annex B added;
h) Bibliography updated with EN 1427.
This document is based on ASTM D 6648-01 [1].
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oSIST prEN 14771:2022
prEN 14771:2022 (E)
1 Scope

This document specifies a method for the determination of the flexural creep stiffness of bituminous

binders in the range of 30 MPa to 1 GPa by means of the bending beam rheometer.

WARNING — The use of this document may 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 document to establish appropriate safety and health practices and to

determine the applicability of regulatory limitations prior to use.
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 12594, Bitumen and bituminous binders - Preparation of test samples

EN 14023, Bitumen and bituminous binders - Specification framework for polymer modified bitumens

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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
flexural creep stiffness
S(t)
ratio obtained by dividing the bending stress by the bending strain

Note 1 to entry: The strain will increase with the loading time and therefore the flexural creep stiffness will also be

a function of time.
3.2
m-value

absolute value of the slope of the curve of the logarithm of the stiffness versus the logarithm of time

3.3
contact load

load required to maintain positive contact between the test specimen, supports and the loading shaft

Note 1 to entry: The contact load of 25 mN to 45 mN is used in this method.
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3.4
test load
load used to determine the stiffness of the bituminous binder being tested
Note 1 to entry: The test load of 930 mN to 1030 mN is used in this method.
4 Principle

The bending beam rheometer is used to measure the mid-point deflection, in three-point bending, of a

beam of bituminous binder. A constant load is applied to the mid-point of the test specimen for a defined

loading time and the deflection is measured as a function of time. A low temperature liquid bath is used

to control the temperature. The stiffness of the test specimen for the specific loading times is calculated

from the bending stress and strain.
5 Apparatus

5.1 Bending Beam Rheometer (BBR), consisting of a loading frame with test specimen supports, a

controlled temperature liquid bath and a data acquisition system.

5.1.1 The loading frame, consisting of a set of sample supports, a blunt-nosed shaft to apply the load

to the mid-point of the test specimen, a load cell mounted in line with the loading shaft, a means for

zeroing the load applied to the specimen, a means for applying a constant load to the test specimen and

a deflection measuring transducer attached to the loading shaft. A schematic picture of the device is

shown in Figure 1.

5.1.1.1 The loading system, which shall be capable of applying a contact load of 25 mN to 45 mN to

the test specimen and maintaining a constant test load from within the range of 930 mN to 1 030 mN with

a tolerance of ± 10 mN. The rise time from the contact load to the test load shall be less than 0,5 s. Details

of the loading pattern are shown in Figure 2.

5.1.1.2 The loading shaft, which shall be continuous and in line with the load cell and deflection

measuring transducer with a spherically shaped end (6,3 ± 0,3) mm in radius.

5.1.1.3 The load cell, which shall have a minimum capacity of no less than 2,0 N and a resolution of

at least 2,5 mN.

5.1.1.4 The LVD-transducer, or other suitable device to measure the deflection of the test specimen

that shall have a linear range of at least 6 mm, and be capable of resolving linear movement of 2,5 μm.

5.1.1.5 The sample supports, which shall consist of two non-corrosive metal supports with a

(3,0 ± 0,3) mm contact radius and spaced 101 mm to 103 mm apart. The spacing of the supports shall be

measured to 0,3 mm (see Figure 3).

5.1.2 A temperature measurement device, used as a calibrated temperature transducer that shall be

capable of measuring the temperature with an accuracy of ± 0,1 °C over the range of - 36 °C to 0 °C. The

measuring head shall be mounted within 50 mm of the mid-point of the test specimen.

5.1.3 A liquid bath, capable of maintaining the desired test temperature near the test sample within

± 0,2 °C during isothermal conditioning and during the test procedure in the range of - 36 °C to 0 °C. Bath

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liquid shall not affect the properties of the bituminous binder being tested. The density of the liquid shall

not exceed 1 050 kg/m at the test temperature.

NOTE 95 % (volume fraction) ethanol, or methanol have been found to be suitable as a bath liquid.

5.1.3.1 A bath agitator, which shall be used for maintaining the required temperature homogeneity

with agitation intensity so that the fluid currents do not disturb the testing process.

5.1.3.2 A circulating bath, an optional separate bath unit, cooling the test bath liquid.

5.1.4 A data acquisition and control system, which resolves loads to at least 2,5 mN, test specimen

deflection to at least 2,5 μm, and bath liquid temperature to the nearest 0,1 °C. The software shall control

the measuring system and record time, load deflection and temperature during the test. All the load and

deflection readings shall be an average of at least five points within ± 0,2 s of the reporting time.

5.2 Test specimen moulds, with the interior dimensions (6,4 ± 0,1) mm wide, (12,7 ± 0,1) mm deep

and (127 ± 5) mm long, fabricated from a suitable metal as shown in Figure 4. The thickness of the two

end pieces used for each mould shall not vary from each other in thickness by more than 0,1 mm.

NOTE Small errors in thickness of the test specimen can have a large effect on the calculated modulus because

the calculated modulus is a function of the thickness raised to the third power.

5.2.1 Plastic strips, or strips from silicone paper or similar material that does not adhere to the test

specimen and does not interact with the bituminous binder, to cover those sections of the test specimen

moulds which will come in contact with test specimen during their preparation, except for the end pieces.

6 Preparation of test samples
6.1 General

NOTE BBR testing can be done on all types of binders and stages (see scope); typically, BBR testing is carried

out on long-term aged binders.

Take the laboratory sample in accordance with EN 58, taking all necessary safety precautions, and

ensuring that the test sample is representative of the laboratory sample from which it is taken. Ensure

that the laboratory sample is homogeneous and is not contaminated (see EN 1425).

Remove a sufficient amount of the laboratory sample, if necessary using a warmed knife, and transfer it

to a suitable container. Melt the sample according to EN 12594.

Raise the material to the required temperature of not more than 100 °C above the expected softening

point (see EN 1427). For polymer modified bitumen follow the procedure provided by the supplier. If no

other guidance is provided by the supplier for polymer modified bitumen according to EN 14023 the

temperature shall be within 180 °C to 200 °C. The temperatu
...