SIST EN 12697-44:2010
(Main)Bituminous mixtures - Test methods for hot mix asphalt - Part 44: Crack propagation by semi-circular bending test
Bituminous mixtures - Test methods for hot mix asphalt - Part 44: Crack propagation by semi-circular bending test
This European Standard 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 für Heißasphalt - Teil 44: Bestimmung des Risswachstums durch eine Biegeprüfung unter Aufbringung einer Dreipunkt-Belastung (semi-circular bending test [SCB-Prüfung])
Diese Europäische Norm beschreibt das Verfahren der Biegeprüfung unter Aufbringung einer Dreipunkt-Belastung (en: Semi-Circular Bending Test; SCB-Prüfung) zur Bestimmung der Zugfestigkeit oder Bruch¬zähigkeit von Asphaltgemischen zur Bewertung ihres Risswachstumspotentials.
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 die Berechnung von Lastfällen, in denen das Vorhandensein einer Kerbe kritisch ist.
Zu beachten ist, dass dieses Verfahren nur eine Prüfung zur Bestimmung des Widerstandes eines Asphalt-Beton-Gemischs 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 pour mélange hydrocarboné à chaud - Partie 44 : Propagation de fissure par essai de flexion d'un bloc semi-circulaire
La présente Norme européenne 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 de béton 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 za vroče asfaltne zmesi - 44. del: Širjenje razpoke s polkrožnim upogibnim preskusom
Ta evropski standard določa preskusno metodo s polkrožnim upogibnim preskusom za ugotavljanje natezne trdnosti ali odpornosti proti lomljenju asfaltne zmesi za oceno potenciala širjenja razpoke. Rezultati preskusa se lahko uporabijo za izračun: - maksimalne obremenitve, ki jih material z zarezo (razpoko) lahko prenaša, preden popusti; - kdaj je prisotnost zareze kritična. Upoštevati je treba, da preskus le opisuje metodo za ugotavljanje odpornosti proti širjenju razpoke asfaltne zmesi. Fazo širjenja razpoke opisuje drugi del mehanizma odpovedi med dinamično obremenitvijo. Prvo fazo, ki je začetna faza razpoke, v glavnem zajema preskus trdnosti (EN 12697-24).
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Asphalt - Prüfverfahren für Heißasphalt - Teil 44: Bestimmung des Risswachstums durch eine Biegeprüfung unter Aufbringung einer Dreipunkt-Belastung (semi-circular bending test [SCB-Prüfung])Mélanges bitumineux - Méthodes d'essai pour mélange hydrocarboné à chaud - Partie 44 : Propagation de fissure par essai de flexion d'un bloc semi-circulaireBituminous mixtures - Test methods for hot mix asphalt - Part 44: Crack propagation by semi-circular bending test93.080.20Materiali za gradnjo cestRoad construction materialsICS:Ta slovenski standard je istoveten z:EN 12697-44:2010SIST EN 12697-44:2010en,fr,de01-december-2010SIST EN 12697-44:2010SLOVENSKI
STANDARD
SIST EN 12697-44:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12697-44
September 2010 ICS 93.080.20 English Version
Bituminous mixtures - Test methods for hot mix asphalt - Part 44: Crack propagation by semi-circular bending test
Mélanges bitumineux - Méthodes d'essai pour mélange hydrocarboné à chaud - Partie 44 : Propagation de fissure par essai de flexion d'un bloc semi-circulaire
Asphalt - Prüfverfahren für Heißasphalt - Teil 44: Bestimmung der Rissausbreitung mittels Halbzylinder-Biegeversuch This European Standard was approved by CEN on 28 August 2010.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12697-44:2010: ESIST EN 12697-44:2010
EN 12697-44:2010 (E) 2 Contents Page Foreword .31 Scope .62 Normative references .63 Terms and definitions .64 Symbols .75 Principle .76 Apparatus .86.1 Test Machine .86.2 Load cell or other force-measuring gauge .86.3 Deformation gauge .86.4 Roller bearings .86.5 Specimen bearing strips .96.6 Metal loading strip L .96.7 Monitoring equipment .96.8 Sliding callipers .96.9 Climatic chamber .96.10 Cutting machine .97 Sample preparation . 107.1 Manufacture . 107.2 Dimensional check . 107.3 Storage . 118 Procedure . 119 Calculations . 1210 Test report . 1411 Precision data . 14Bibliography . 15 SIST EN 12697-44:2010
EN 12697-44:2010 (E) 3 Foreword This document (EN 12697-44:2010) has been prepared by Technical Committee CEN/TC 227 “Road Materials”, the secretariat of which is held by DIN. 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 March 2011, and conflicting national standards shall be withdrawn at the latest by March 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This European Standard is one of a series of standards as listed below: EN 12697-1, Bituminous mixtures — Test methods for hot mix asphalt — Part 1: Soluble binder content EN 12697-2, Bituminous mixtures — Test methods for hot mix asphalt — Part 2: Determination of particle size distribution EN 12697-3, Bituminous mixtures — Test methods for hot mix asphalt — Part 3: Bitumen recovery: Rotary evaporator EN 12697-4, Bituminous mixtures — Test methods for hot mix asphalt — Part 4: Bitumen recovery: Fractionating column EN 12697-5, Bituminous mixtures — Test methods for hot mix asphalt — Part 5: Determination of the maximum density EN 12697-6, Bituminous mixtures — Test methods for hot mix asphalt — Part 6: Determination of bulk density of bituminous specimens EN 12697-7, Bituminous mixtures — Test methods for hot mix asphalt — Part 7: Determination of bulk density of bituminous specimens by gamma rays EN 12697-8, Bituminous mixtures — Test methods for hot mix asphalt — Part 8: Determination of void characteristics of bituminous specimens EN 12697-9, Bituminous mixtures — Test methods for hot mix asphalt — Part 9: Determination of the reference density EN 12697-10, Bituminous mixtures — Test methods for hot mix asphalt — Part 10: Compactability EN 12697-11, Bituminous mixtures — Test methods for hot mix asphalt — Part 11: Determination of the affinity between aggregate and bitumen EN 12697-12, Bituminous mixtures — Test methods for hot mix asphalt — Part 12: Determination of the water sensitivity of bituminous specimens EN 12697-13, Bituminous mixtures — Test methods for hot mix asphalt — Part 13: Temperature measurement EN 12697-14, Bituminous mixtures — Test methods for hot mix asphalt — Part 14: Water content SIST EN 12697-44:2010
EN 12697-44:2010 (E) 4 EN 12697-15, Bituminous mixtures — Test methods for hot mix asphalt — Part 15: Determination of the segregation sensitivity EN 12697-16, Bituminous mixtures — Test methods for hot mix asphalt — Part 16: Abrasion by studded tyres EN 12697-17, Bituminous mixtures — Test methods for hot mix asphalt — Part 17: Particle loss of porous asphalt specimen EN 12697-18, Bituminous mixtures — Test methods for hot mix asphalt — Part 18: Binder drainage EN 12697-19, Bituminous mixtures — Test methods for hot mix asphalt — Part 19: Permeability of specimen EN 12697-20, Bituminous mixtures — Test methods for hot mix asphalt — Part 20: Indentation using cube or Marshall specimens EN 12697-21, Bituminous mixtures — Test methods for hot mix asphalt — Part 21: Indentation using plate specimens EN 12697-22, Bituminous mixtures — Test methods for hot mix asphalt — Part 22: Wheel tracking EN 12697-23, Bituminous mixtures — Test methods for hot mix asphalt — Part 23: Determination of the indirect tensile strength of bituminous specimens EN 12697-24, Bituminous mixtures — Test methods for hot mix asphalt — Part 24: Resistance to fatigue EN 12697-25, Bituminous mixtures — Test methods for hot mix asphalt — Part 25: Cyclic compression test EN 12697-26, Bituminous mixtures — Test methods for hot mix asphalt — Part 26: Stiffness EN 12697-27, Bituminous mixtures — Test methods for hot mix asphalt — Part 27: Sampling EN 12697-28, Bituminous mixtures — Test methods for hot mix asphalt — Part 28: Preparation of samples for determining binder content, water content and grading EN 12697-29, Bituminous mixtures — Test methods for hot mix asphalt — Part 29: Determination of the dimensions of a bituminous specimen EN 12697-30, Bituminous mixtures — Test methods for hot mix asphalt — Part 30: Specimen preparation by impact compactor EN 12697-31, Bituminous mixtures — Test methods for hot mix asphalt — Part 31: Specimen preparation by gyratory compactor EN 12697-32, Bituminous mixtures — Test methods for hot mix asphalt — Part 32: Laboratory compaction of bituminous mixtures by a vibratory compactor EN 12697-33, Bituminous mixtures — Test methods for hot mix asphalt — Part 33: Specimen prepared by roller compactor EN 12697-34, Bituminous mixtures — Test methods for hot mix asphalt — Part 34: Marshall test EN 12697-35, Bituminous mixtures — Test methods for hot mix asphalt — Part 35: Laboratory mixing EN 12697-36, Bituminous mixtures — Test methods for hot mix asphalt — Part 36: Determination of the thickness of a bituminous pavement EN 12697-37, Bituminous mixtures — Test methods for hot mix asphalt — Part 37: Hot sand test for the adhesivity of binder on precoated chippings for HRA SIST EN 12697-44:2010
EN 12697-44:2010 (E) 5 EN 12697-38, Bituminous mixtures — Test methods for hot mix asphalt — Part 38: Common equipment and calibration EN 12697-39, Bituminous mixtures — Test methods for hot mix asphalt — Part 39: Binder content by ignition EN 12697-40, Bituminous mixtures — Test methods for hot mix asphalt — Part 40: In situ drainability EN 12697-41, Bituminous mixtures — Test methods for hot mix asphalt — Part 41: Resistance to de-icing fluids EN 12697-42, Bituminous mixtures — Test methods for hot mix asphalt — Part 42: Amount of coarse foreign matter in reclaimed asphalt EN 12697-43, Bituminous mixtures — Test methods for hot mix asphalt — Part 43: Resistance to fuel EN 12697-44, Bituminous mixtures — Test methods for hot mix asphalt — Part 44: Crack propagation by semi-circular bending test prEN 12697-45, Bituminous mixtures — Test methods for hot mix asphalt — Part 45: Saturation Ageing Tensile Stiffness (SATS) Conditioning Test prEN 12697-46, Bituminous mixtures — Test methods for hot mix asphalt — Part 46: Low Temperature Cracking and Properties by Uniaxial Tension Tests EN 12697-47, Bituminous mixtures — Test methods for hot mix asphalt — Part 47: Determination of the ash content of natural asphalts prEN 12697-48, Bituminous mixtures — Test methods for hot mix asphalt — Part 48: Inter-layer bond strength (in preparation) prEN 12697-49, Bituminous mixtures — Test methods for hot mix asphalt — Part 49: Skid resistance of asphalt in the laboratory (in preparation) prEN 12697-50, Bituminous mixtures — Test methods for hot mix asphalt — Part 50: Scuffing resistance of surface course (in preparation) According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 12697-44:2010
EN 12697-44:2010 (E) 6 1 Scope This European Standard 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 potent
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