1、December 2010 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).I
2、CS 93.080.20!$lV“1735951www.din.deDDIN EN 12697-44Bituminous mixtures Test methods for hot mix asphalt Part 44: Crack propagation by semi-circular bending testEnglish translation of DIN EN 12697-44:2010-12Asphalt Prfverfahren fr Heiasphalt Teil 44: Bestimmung der Rissausbreitung mittels Halbzylinder
3、-BiegeversuchEnglische bersetzung von DIN EN 12697-44:2010-12Mlanges bitumineux Mthodes dessai pour mlange hydrocarbon chaud Partie 44: Propagation de fissure par essai de flexion dun bloc semi-circulaireTraduction anglaise de DIN EN 12697-44:2010-12www.beuth.deDocument comprises pagesIn case of dou
4、bt, the German-language original shall be considered authoritative.1711.10 DIN EN 12697-44:2010-12 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 227 “Road materials” (Secretariat: DIN, Germany). The responsible German body invo
5、lved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-10-10 AA Asphalt. 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12697-44 September 2010 ICS 93.080.20 English Version Bituminous mixtures - Test methods fo
6、r hot mix asphalt - Part 44: Crack propagation by semi-circular bending test Mlanges bitumineux - Mthodes dessai pour mlange hydrocarbon chaud - Partie 44 : Propagation de fissure par essai de flexion dun bloc semi-circulaire Asphalt - Prfverfahren fr Heiasphalt - Teil 44: Bestimmung der Rissausbrei
7、tung 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
8、-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 u
9、nder 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, Germa
10、ny, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG
11、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: EEN 12697-44:2010 (E) 2 Contents Page Foreword 31 Scope 62 Normative references 63 Terms and definitions .64 S
12、ymbols 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
13、Sample preparation 107.1 Manufacture . 107.2 Dimensional check . 107.3 Storage . 118 Procedure 119 Calculations . 1210 Test report . 1411 Precision data . 14Bibliography . 15DIN EN 12697-44:2010-12 EN 12697-44:2010 (E) 3 Foreword This document (EN 12697-44:2010) has been prepared by Technical Commit
14、tee 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 l
15、atest 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
16、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
17、 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
18、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: Determin
19、ation 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 method
20、s 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
21、13: Temperature measurement EN 12697-14, Bituminous mixtures Test methods for hot mix asphalt Part 14: Water content DIN EN 12697-44:2010-12 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, Bit
22、uminous 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
23、-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 u
24、sing 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 metho
25、ds 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 asph
26、alt 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
27、 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 mi
28、x 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-
29、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 t
30、est for the adhesivity of binder on precoated chippings for HRA DIN EN 12697-44:2010-12 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
31、 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: Amo
32、unt 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 mixture
33、s 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 ho
34、t 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
35、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 imple
36、ment 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, Swi
37、tzerland and the United Kingdom. DIN EN 12697-44:2010-12 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 potential for crack propagation
38、. 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 aspha
39、lt 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). 2 Normative references The following referenced documents are indispensable for th
40、e application of this document. For dated referenced, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12697-27, Bituminous mixtures Test methods for hot mix asphalt Part 27: Sampling EN 12697-31, Bituminous
41、mixtures Test methods for hot mix asphalt Part 31: Specimen preparation by gyratory compactor EN 12697-33, Bituminous mixtures Test methods for hot mix asphalt Part 33: Specimen prepared by roller compactor EN 12697-35, Bituminous mixtures Test methods for hot mix asphalt Part 35: Laboratory mixing
42、3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 test piece sample obtained by sawing an asphalt cylinder through a diameter 3.2 strain relative deformation of the test piece 3.3 stress force per unit area 3.4 horizontal stress tensile stress
43、prevailing at the base of the test piece 3.5 tensile strength strength of the material under tensile loading DIN EN 12697-44:2010-12 EN 12697-44:2010 (E) 7 3.6 fracture toughness resistance to failure of the test piece by breaking 4 Symbols a Notch depth in millimetres (mm) D Diameter in millimetres
44、 (mm) f(a/W) Geometric factor F Force in newtons (N) FmaxMaximum force in newtons (N) KIcFracture toughness in newtons per millimetre to the power of 1,5 (N/mm1,5) t Thickness in millimetres (mm) W Vertical displacement at maximum force in millimetres (mm) maxStrain at maximum force in percent (%) S
45、tress in newtons per square millimetre (N/mm) horHorizontal stress in newtons per square millimetre (N/mm) maxMaximum stress at failure in newtons per square millimetre (N/mm) 5 Principle A half cylinder test piece with a centre crack is loaded in three-point bending in such a way that the middle of
46、 the base of the test piece is subjected to a tensile stress. During the test, the deformation increases at a constant rate of 5 mm/min. The corresponding load increases to a maximum value, Fmax, that is directly related to the fracture toughness of the test sample. In Figure 1 an example of the tes
47、t frame and specimen is given. DIN EN 12697-44:2010-12 EN 12697-44:2010 (E) 8 Dimensions in millimetres Figure 1 Example of the test frame and specimen for the SCB-test 6 Apparatus 6.1 Test Machine The machine should have a range of at least 50 kN and have a drive with which a constant deformation r
48、ate of (5,0 0,2) mm/min is maintained during the test. 6.2 Load cell or other force-measuring gauge Capable of measuring the load with an accuracy of 0,2 kN. 6.3 Deformation gauge Capable of measuring the deformation to an accuracy of 0,01 mm. 6.4 Roller bearings Capable of rotating on its axis with a support length (centre to centre) of (120,0 0,5) mm and a diameter of (35,0 0,5) mm, as shown in Figure 2. DIN EN 12697-44:2010-12 EN 12697-44:2010 (E) 9 Dimensions in millimetres Key 1 Roller bearings 2 Loading strip Figure 2 Schematic of semi-circular bend
