EN 12697-46:2020
(Main)Bituminous mixtures - Test methods - Part 46: Low temperature cracking and properties by uniaxial tension tests
Bituminous mixtures - Test methods - Part 46: Low temperature cracking and properties by uniaxial tension tests
This document specifies uniaxial tension tests for characterizing the resistance of an asphalt mixture against low temperature cracking. The results of the uniaxial tension tests can be used to evaluate the following:
- tensile strength at a specified temperature, using the uniaxial tension stress test (UTST);
- minimum temperature that the asphalt can resist before failure, using the thermal stress restrained specimen test (TSRST);
- tensile strength reserve at a specified temperature (using a combination of TSRST and UTST);
- relaxation time, using the relaxation test (RT);
- creep curve to back calculate rheological parameters, using the tensile creep tests (TCT);
- fatigue resistance at low temperatures due to the combination of cryogenic and mechanical loads, using the uniaxial cyclic tension stress tests (UCTST).
Asphalt - Prüfverfahren - Teil 46: Widerstand gegen Kälterisse und Tieftemperaturverhalten bei einachsigen Zugversuchen
Dieses Dokument legt einachsige Zugversuche zur Bestimmung des Widerstandes eines Asphaltgemischs gegen Kälterisse fest. Die Ergebnisse der einachsigen Zugversuche können zur Beurteilung folgender Eigen¬schaften verwendet werden:
- Zugspannung bei einer festgelegten Temperatur unter Anwendung des direkten (einachsigen) Zugversuchs (en: Uniaxial Tension Stress Test, UTST);
- Tiefsttemperatur, bis zu der der Asphalt dem Ausfall widerstehen kann, unter Anwendung des Abkühlversuchs (en: Thermal Stress Restrained Specimen Test, TSRST);
- Zugfestigkeitsreserve bei einer festgelegten Temperatur (unter Anwendung einer Kombination aus TSRST und UTST);
- Relaxationszeit unter Anwendung des Relaxationsversuchs (en: Relaxation Test, RT);
- Kriechkurve, um durch Zugkriechversuche (en: Tensile Creep Test, TCT) auf rheologische Parameter zurückrechnen zu können; und
- Ermüdungsverhalten bei niedrigen Temperaturen aufgrund der Kombination kryogener und mechanischer Beanspruchungen unter Anwendung von einachsigen zyklischen Zugversuchen (en: Uniaxial Cyclic Tension Stress Test, UCTST).
Mélanges bitumineux - Méthodes d'essai - Partie 46 : Fissuration et propriétés à basse température par des essais de traction uniaxiale
Ce document spécifie les essais de traction uniaxiale permettant de caractériser la résistance à la fissuration à basse température d'un mélange d'enrobé. Les résultats des essais de traction uniaxiale peuvent servir aux évaluations suivantes :
- la résistance à la traction à une température spécifiée en procédant à un essai de contrainte de traction uniaxiale (UTST) ;
- la température minimale à laquelle peut résister l'enrobé avant sa rupture en procédant à un essai sur éprouvette en retrait empêché sous contrainte thermique (TSRST) ;
- la réserve de résistance à la traction à une température spécifiée (en combinant TSRST et UTST) ;
- du temps de relaxation en procédant à l'essai de relaxation (RT) ;
- la courbe de fluage afin de recalculer les paramètres rhéologiques en procédant à des essais de fluage (TCT) ;
- la résistance à la fatigue aux basses températures due à la combinaison de charges cryogéniques et mécaniques en procédant à des essais de contrainte de traction cyclique uniaxiale (UCTST).
Bitumenske zmesi - Preskusne metode - 46. del: Odpornost proti razpokam pri nizkih temperaturah z enoosnimi nateznimi preskusi
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 12697-46:2012
Bitumenske zmesi - Preskusne metode - 46. del: Odpornost proti razpokam pri
nizkih temperaturah z enoosnimi nateznimi preskusi
Bituminous mixtures - Test methods - Part 46: Low temperature cracking and properties
by uniaxial tension tests
Asphalt - Prüfverfahren - Teil 46: Widerstand gegen Kälterisse und
Tieftemperaturverhalten bei einachsigen Zugversuchen
Mélanges bitumineux - Méthodes d'essai - Partie 46: Fissuration à basse température et
les propriétés des tensions uni axiaux par des tests
Ta slovenski standard je istoveten z: EN 12697-46:2020
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.
EN 12697-46
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 93.080.20 Supersedes EN 12697-46:2012
English Version
Bituminous mixtures - Test methods - Part 46: Low
temperature cracking and properties by uniaxial tension
tests
Mélanges bitumineux - Méthodes d'essai - Partie 46 : Asphalt - Prüfverfahren - Teil 46: Widerstand gegen
Fissuration et propriétés à basse température par des Kälterisse und Tieftemperaturverhalten bei
essais de traction uniaxiale einachsigen Zugversuchen
This European Standard was approved by CEN on 18 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 12697-46:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 8
5 Apparatus . 9
5.1 Testing device for conducting UTST, TSRST, RT and TCT . 9
5.1.1 General . 9
5.1.2 Load device . 9
5.1.3 Deformation measurement system . 11
5.1.4 Load measurement system . 11
5.1.5 Recording equipment . 11
5.1.6 Thermostatic chamber . 12
5.2 Testing device for conducting UCTST . 12
5.2.1 Dynamic testing device . 12
5.2.2 Monitoring system . 12
5.2.3 Electronic signal amplifier . 13
5.2.4 Thermostatic chamber . 13
5.2.5 Recording equipment . 13
6 Calibration . 13
6.1 Testing device for conducting UTST, TSRST, relaxation test and tensile creep test . 13
6.2 Testing device for conducting UCTST . 13
7 Specimen preparation . 14
7.1 Number of samples . 14
7.2 Dimensions . 14
7.3 Preparation . 14
7.4 Bulk density . 14
7.5 Drying . 15
7.6 Storage . 15
7.7 Mounting . 15
7.8 Installation and conditioning . 16
8 Procedure. 16
8.1 Uniaxial tension stress test (UTST) . 16
8.2 Thermal stress restrained specimen test (TSRST) . 17
8.3 Relaxation test (RT) . 17
8.4 Tensile creep test (TCT) . 17
8.5 Uniaxial cyclic tensile stress test (UCTST) . 18
8.5.1 Test temperature and test frequency . 18
8.5.2 Base stress . 18
8.5.3 Peak stress . 18
9 Evaluation . 19
9.1 Tension strength reserve . 19
9.2 Uniaxial cyclic tensile stress test (UCTST) . 21
10 Test report . 22
10.1 General . 22
10.2 General information . 22
10.3 Information on specimen. 22
10.4 Information on test method . 22
10.5 Information on the test and results . 22
10.5.1 Uniaxial tension stress test (UTST) . 22
10.5.2 Thermal stress restrained specimen test (TSRST) . 23
10.5.3 Tension strength reserve . 23
10.5.4 Relaxation test (RT) . 23
10.5.5 Tensile creep test (TCT) . 23
10.5.6 Uniaxial cyclic tensile stress test (UCTST) . 23
11 Precision . 24
Bibliography . 25
European foreword
This document (EN 12697-46:2020) has been prepared by Technical Committee CEN/TC 227 “Road
materials”, the secretariat of which is held by BSI.
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 August 2020, and conflicting national standards shall
be withdrawn at the latest by August 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.
This document supersedes EN 12697-46:2012.
The following is a list of significant technical changes since the previous edition:
— the title no longer makes the method exclusively for hot mix asphalt;
— [ge] editorial update according to current standard template;
— [ge] NOTEs modified and adjusted to normal text where appropriate according to ISO/IEC
Directives – Part 2:2016, 24.5;
— [Clause 4] changed order of indent 3 and 4 for consistency with Clause 8.3 and 8.4;
— [5.1.4] clause amended to read: Load measurement system, capable of monitoring the axial load up
to (25 ± 0,025) kN with resolution of 0,001 kN or better and with an accuracy of ±0,01 kN or better.
— [5.1.4] excessive and incorrect NOTE deleted;
— [5.2.1] accuracy for Dynamic testing device (0,1 Hz) completed with “±”;
— [5.2.1] correction of keys for Figure 8;
— [5.2.5] clarified that temperature is measured on a dummy specimen;
— [6.1.1] clarified that the main reason for required calibration is to obtain correct loading condition;
— [7.3.1] added description for sawing of prismatic specimen to ensure a precise cross section;
— [7.3.2] added description for thickness to enable sawing of prismatic specimens;
— [8.2.2] clarified that the results of the test evaluation are measured (not failure stress and failure
temperature;
— [8.5.1]; NOTE modified and adjusted to normal text according to ISO/IEC Directives – Part 2:2016,
24.5. Added description of suitable test temperature and testing frequency for intermediate low
temperatures;
— [8.5.3.6] the reason for measuring clarified.
A list of all parts in the EN 12697 series 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 implement this European Standard: Austria, Belgium, Bulg
...
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