SIST EN 12697-44:2019
(Main)Bituminous mixtures - Test methods - Part 44: Crack propagation by semi-circular bending test
Bituminous mixtures - Test methods - Part 44: Crack propagation by semi-circular bending test
This document specifies the Semi-Circular Bending (SCB) test method to determine the tensile strength or fracture toughness of an asphalt mixture for the assessment of the potential for crack propagation. The results of the test can be used to calculate:
- the maximum load that the material containing a notch (crack) can resist before failure;
- when the presence of a notch is critical.
It should be noted that the test only describes a method to determine the resistance to crack propagation of an asphalt mixture. The crack propagation phase describes the second part of failure mechanism during dynamic loading. The first phase, which is the crack initiation phase, is mainly covered by the fatigue test (EN 12697-24).
Asphalt - Prüfverfahren - Teil 44: Bestimmung der Rissausbreitung mittels Halbzylinder-Biegeversuch
Dieses Dokument legt das Verfahren zur Messung der Rissausbreitung mittels Halbzylinder-Biegeversuch (en: Semi-Circular Bending (SCB)) zur Bestimmung der Zugfestigkeit oder Bruchzähigkeit von Asphaltgemischen zur Beurteilung ihres Risswachstumspotentials fest.
Die Ergebnisse dieser Prüfung können für Folgendes verwendet werden:
— zur Berechnung der Höchstlast, der ein mit einer Kerbe (Riss) versehenes Material, ohne zu reißen, standhalten kann;
— für Berechnungen, in denen das Vorhandensein einer Kerbe kritisch ist.
Es sollte beachtet werden, dass diese Prüfung nur ein Verfahren zur Bestimmung des Widerstandes von Asphaltgemischen gegen Risswachstum beschreibt. Die Risswachstumsphase beschreibt den zweiten Teil des Ausfallprozesses bei dynamischer Belastung. Die erste Phase, d. h. die Rissentstehungsphase, wird in erster Linie durch die Ermüdungsprüfung abgedeckt (siehe EN 12697 24).
Mélanges bitumineux - Méthodes d'essai - Partie 44 : Propagation de fissure par essai de flexion d'un bloc semi-circulaire
Ce document décrit la méthode d’essai de flexion d’un bloc semi-circulaire (SCB) permettant de déterminer la résistance à la traction ou la ténacité à la rupture d’un mélange bitumineux pour l’évaluation du potentiel de propagation de fissure. Les résultats de l’essai peuvent servir à déterminer :
— la charge maximale que peut supporter un matériau présentant une entaille (fissure) avant de se rompre ;
— si la présence d’une entaille est critique ou non.
Il convient de noter que l’essai décrit seulement une méthode de détermination de la résistance à la propagation de fissure d’un mélange bitumineux. La phase de propagation de fissure correspond à la seconde partie du mécanisme de rupture sous une charge dynamique. La première phase, c’est-à-dire la phase d’initiation de la fissure, est principalement traitée par l’essai de fatigue (voir l’EN 12697 24).
Bitumenske zmesi - Preskusne metode - 44. del: Širjenje razpoke s polkrožnim upogibnim preskusom
Ta osnutek evropskega standarda določa preskusno metodo s polkrožnim upogibnim preskusom (SCB) za ugotavljanje natezne trdnosti ali odpornosti asfaltne zmesi proti lomljenju za ocenjevanje možnosti širjenja razpoke. Rezultati preskusa se lahko uporabijo za izračun:
– največje obremenitve, ki jo še lahko prenese material z zarezo (razpoko);
– tega, kdaj je prisotnost zareze kritična.
Opozoriti je treba, da preskus opisuje zgolj metodo za ugotavljanje odpornosti na širjenje razpoke asfaltne zmesi. Faza širjenja razpoke opisuje drugi del mehanizma okvare pri dinamični obremenitvi. Prva faza, tj. faza uvajanja razpoke, je v glavnem zajeta v preskusu utrujenosti (EN 12697-24).
General Information
- Status
- Published
- Public Enquiry End Date
- 19-Nov-2017
- Publication Date
- 07-Apr-2019
- Technical Committee
- CES - Roads
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 18-Mar-2019
- Due Date
- 23-May-2019
- Completion Date
- 08-Apr-2019
Relations
- Effective Date
- 01-May-2019
Overview - EN 12697-44:2019 (SCB test for bituminous mixtures)
EN 12697-44:2019 is a CEN standard that specifies the Semi‑Circular Bending (SCB) test method for bituminous mixtures (asphalt). The method determines tensile strength or fracture toughness of an asphalt mixture to assess its susceptibility to crack propagation. Results allow calculation of the maximum load a notched specimen can resist (Fmax) and whether a notch (pre‑existing crack) is critical for failure. The test focuses on the crack propagation phase of failure; crack initiation is mainly covered by EN 12697‑24 (fatigue testing).
Key topics and technical requirements
- Test principle: a half‑cylinder (semi‑circular) specimen with a centre notch is loaded in three‑point bending so tensile stress occurs at the base; deformation is applied at a constant rate and the maximum load (Fmax) is recorded.
- Specimen and notches:
- Height tolerance added: (74 ± 1) mm.
- Notch width tolerance: (0.40 ± 0.20) mm.
- Loading and rates:
- Constant displacement rate of (5.0 ± 0.2) mm/min during the test.
- Apparatus accuracy:
- Test machine range at least 50 kN.
- Load measurement accuracy ±0.2 kN.
- Displacement measurement accuracy ±0.01 mm.
- Roller support geometry: centre‑to‑centre support length (120.0 ± 0.5) mm, roller diameter (35.0 ± 0.5) mm.
- Measured quantities and outputs:
- Maximum force (Fmax), tensile strength, fracture toughness (KIc, unit N/mm1.5), strain and stress at failure.
- Test scope: method for resistance to crack propagation only; not a full fatigue initiation assessment.
Applications - who uses EN 12697-44:2019
- Pavement materials laboratories for mix characterization and quality control.
- Road and pavement engineers for mixture design and selection of crack‑resistant asphalt.
- Contractors and QA/QC teams for acceptance testing and verification of production mixes.
- Research organizations and universities studying fracture mechanics, asphalt crack propagation, or comparing binder/aggregate effects.
- Forensic investigations of pavement distress to quantify propagation resistance.
Practical benefits include objective comparison of mixes, support for specification limits, and data for modelling crack growth in pavements.
Related standards
- EN 12697‑24 - Fatigue test (crack initiation phase)
- EN 12697‑27 - Sampling
- EN 12697‑31 - Specimen preparation by gyratory compactor
- EN 12697‑33 - Specimen prepared by roller compactor
- EN 12697‑35 - Laboratory mixing
Keywords: EN 12697-44:2019, SCB test, semi‑circular bending test, bituminous mixtures, asphalt fracture toughness, crack propagation, pavement materials, tensile strength, CEN.
Frequently Asked Questions
SIST EN 12697-44:2019 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Bituminous mixtures - Test methods - Part 44: Crack propagation by semi-circular bending test". This standard covers: This document specifies the Semi-Circular Bending (SCB) test method to determine the tensile strength or fracture toughness of an asphalt mixture for the assessment of the potential for crack propagation. The results of the test can be used to calculate: - the maximum load that the material containing a notch (crack) can resist before failure; - when the presence of a notch is critical. It should be noted that the test only describes a method to determine the resistance to crack propagation of an asphalt mixture. The crack propagation phase describes the second part of failure mechanism during dynamic loading. The first phase, which is the crack initiation phase, is mainly covered by the fatigue test (EN 12697-24).
This document specifies the Semi-Circular Bending (SCB) test method to determine the tensile strength or fracture toughness of an asphalt mixture for the assessment of the potential for crack propagation. The results of the test can be used to calculate: - the maximum load that the material containing a notch (crack) can resist before failure; - when the presence of a notch is critical. It should be noted that the test only describes a method to determine the resistance to crack propagation of an asphalt mixture. The crack propagation phase describes the second part of failure mechanism during dynamic loading. The first phase, which is the crack initiation phase, is mainly covered by the fatigue test (EN 12697-24).
SIST EN 12697-44:2019 is classified under the following ICS (International Classification for Standards) categories: 93.080.20 - Road construction materials. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 12697-44:2019 has the following relationships with other standards: It is inter standard links to SIST EN 12697-44:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN 12697-44:2019 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bitumenske zmesi - Preskusne metode - 44. del: Širjenje razpoke s polkrožnim upogibnim preskusomAsphalt - Prüfverfahren - Teil 44: Bestimmung der Rissausbreitung mittels Halbzylinder-BiegeversuchMélanges bitumineux - Méthodes d'essai - Partie 44 : Propagation de fissure par essai de flexion d'un bloc semi-circulaireBituminous mixtures - Test methods - Part 44: Crack propagation by semi-circular bending test93.080.20Materiali za gradnjo cestRoad construction materialsICS:Ta slovenski standard je istoveten z:EN 12697-44:2019SIST EN 12697-44:2019en,fr,de01-maj-2019SIST EN 12697-44:2019SLOVENSKI
STANDARDSIST EN 12697-44:20101DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12697-44
March
t r s { ICS
{ uä r z rä t r Supersedes EN
s t x { yæ v vã t r s rEnglish Version
Bituminous mixtures æ Test methods æ Part
v vã Crack propagation by semiæcircular bending test Mélanges bitumineux æ Méthodes d 5essai æ Partie
v v ã Propagation de fissure par essai de flexion d 5un bloc semiæcirculaire
Asphalt æ Prüfverfahren æ Teil
v vã Bestimmung der Rissausbreitung mittels HalbzylinderæBiegeversuch This European Standard was approved by CEN on
s { November
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s { CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t x { yæ v vã t r s { ESIST EN 12697-44:2019
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