SIST EN 14771:2005
(Main)Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending Beam Rheometer (BBR)
Bitumen and bituminous binders - Determination of the flexural creep stiffness - Bending Beam Rheometer (BBR)
This European Standard 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 standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard 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)
Diese Europäische Norm 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 dieser Europäischen Norm kann gefährliche Substanzen, Arbeitsgänge
und Ausrüstung einschließen. In der Europäischen Norm werden nicht alle Sicherheitsprobleme
angesprochen, die mit ihrer Anwendung verbunden sind. Es liegt in der Verantwortung des
Anwenders dieser Norm, geeignete Sicherheits- und Gesundheitsschutzmaßnahmen vorzusehen und
vorher zu klären, ob einschränkende Vorschriften zu berücksichtigen sind.
Bitumes et liants bitumineux - Détermination du module de rigidité en flexion - Rhéometre a 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 a 1 GPa au moyen d'un rhéometre a flexion de barreau (BBR).
AVERTISSEMENT - L'utilisation de la présente Norme européenne peut impliquer l'intervention de produits, d'opérations et d'équipements a caractere dangereux. La présente Norme européenne n'est pas censée aborder tous les problemes de sécurité concernés par son usage. Il est de la responsabilité de l'utilisateur de consulter et d'établir des regles de sécurité et d'hygiene 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
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 14771:2005
01-november-2005
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 -
Rhéometre a flexion de barreau (BBR)
Ta slovenski standard je istoveten z: EN 14771:2005
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
SIST EN 14771:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 14771:2005
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SIST EN 14771:2005
EUROPEAN STANDARD
EN 14771
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 75.140; 91.100.50
English version
Bitumen and bituminous binders - Determination of the flexural
creep stiffness - Bending Beam Rheometer (BBR)
Bitumes et liants bitumineux - Détermination du module de Bitumen und bitumenhaltige Bindemittel - Bestimmung der
rigidité en flexion - Rhéomètre à flexion du barreau (BBR) Biegekriechsteifigkeit - Biegebalkenrheometer (BBR)
This European Standard was approved by CEN on 25 March 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14771:2005: E
worldwide for CEN national Members.
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SIST EN 14771:2005
EN 14771:2005 (E)
Contents page
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
7 Procedure .7
8 Calculation.8
9 Expression of results .9
10 Precision.9
11 Test report .10
2
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SIST EN 14771:2005
EN 14771:2005 (E)
Foreword
This document (EN 14771:2005) has been prepared by Technical Committee CEN/TC 336 “Bituminous
binders”, the secretariat of which is held by AFNOR.
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 November 2005, and conflicting national standards shall be withdrawn
at the latest by November 2005.
This European Standard is based on ASTM D 6648-01.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
3
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SIST EN 14771:2005
EN 14771:2005 (E)
1 Scope
This European Standard 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 European Standard 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 European Standard to establish appropriate
safety and health practices and to determine the applicability of regulatory limitations prior to use.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. 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
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
flexural creep stiffness
S (t)
ratio obtained by dividing the bending stress by the bending strain; 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
the absolute value of the slope of the curve of the logarithm of the stiffness versus the logarithm of time
3.3
contact load
P
c
load required to maintain positive contact between the test specimen, supports and the loading shaft
NOTE The contact load of 25 mN to 45 mN is used in this method.
3.4
test load
P
t
load used to determine the stiffness of the bituminous binder being tested
NOTE The test load of 930 mN to 1030 mN is used in this method.
4
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SIST EN 14771:2005
EN 14771:2005 (E)
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 consists 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 shall be capable of applying a contact load of 25 mN to 45 mN to the test
specimen and maintaining a test load of 930 mN to 1030 mN within ± 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 shall be continuous and in line with the load cell and deflection measuring
transducer with a spherically-shaped end 6,3 mm ± 0,3 mm in radius.
5.1.1.3 The load cell 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
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, shall consist of two non-corrosive metal supports with a 3,0 mm ± 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, as a calibrated temperature transducer shall be capable of
measuring the temperature with the 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 test procedure in the range of – 36 °C to 0 °C. Bath liquid
shall not affect the properties of the bituminous binder being tested. The density of the liquid shall not exceed
3
1050 kg/m at the test temperature.
NOTE 95 % (volume fraction) ethanol has been found to be suitable as a bath liquid.
5.1.3.1 A bath agitator shall be used for maintaining the required temperature homogeneity with
agitation intensity such that the fluid currents do not disturb the testing process.
5.1.3.2 A circulating bath, an optional separate bath unit, cools the test bath liquid.
5.1.4 A data acquisition and control system 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
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SIST EN 14771:2005
EN 14771:2005 (E)
5.2 Test specimen moulds, with the interior dimensions 6,4 mm ± 0,1 mm wide, 12,7 mm ± 0,1 mm
deep and 127 mm ± 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.
6 Preparation of test samples
6.1 General
The laboratory sample shall be taken in accordance with EN 58 and prepared in accordance with EN 12594.
6.2
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