EN 12697-23-2017 en Bituminous mixtures - Test methods - Part 23 Determination of the indirect tensile strength of bituminous specimens.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Bituminous mixtures - Test methodsPart 23: Determination of the indirect tensile strength of bituminous specimensBS EN 1269723:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12697-23 November 2017 ICS 93.080.2

2、0 Supersedes EN 12697-23:2003English Version Bituminous mixtures - Test methods - Part 23: Determination of the indirect tensile strength of bituminous specimens Mlanges bitumineux - Mthode dessais - Partie 23 : Dtermination de la rsistance la traction indirecte des prouvettes bitumineuses Asphalt -

3、 Prfverfahren - Teil 23: Bestimmung der indirekten Zugfestigkeit von Asphalt-Probekrpern This European Standard was approved by CEN on 28 August 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status

4、 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, Germ

5、an). 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

6、, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey

7、and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.

8、 No. EN 12697-23:2017 ENational forewordThis British Standard is the UK implementation of EN 1269723:2017. It supersedes BS EN 1269723:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/510/1, Asphalt products.A list of organizations represented on

9、 this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 90925 2

10、ICS 93.080.20Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2017.Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARDB

11、S EN 1269723:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12697-23 November 2017 ICS 93.080.20 Supersedes EN 12697-23:2003English Version Bituminous mixtures - Test methods - Part 23: Determination of the indirect tensile strength of bituminous specimens Mlanges bitumineux - Mthode dessa

12、is - Partie 23 : Dtermination de la rsistance la traction indirecte des prouvettes bitumineuses Asphalt - Prfverfahren - Teil 23: Bestimmung der indirekten Zugfestigkeit von Asphalt-Probekrpern This European Standard was approved by CEN on 28 August 2017. CEN members are bound to comply with the CEN

13、/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 Cen

14、tre 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 th

15、e official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nether

16、lands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN

17、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12697-23:2017 EBS EN 1269723:2017EN 12697-23:2017 (E) 2 Contents Page European Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Principle . 5 5 Apparatus . 5 5.

18、1 Compression testing machine 5 5.2 Testing head with loading strips . 5 Table 1 Requirements for loading strips . 5 Figure 1 Testing head with loading strips and test specimen 6 5.3 Measuring device 6 5.4 Water bath . 6 5.5 Soft plastic bags . 6 6 Sample preparation 6 6.1 Number of specimen 6 6.2 D

19、imensions of test specimen 6 6.3 Visual examination . 7 6.4 Measurement of dimensions . 7 6.5 Age of Specimen . 7 7 Conditioning 7 7.1 Thermal treatment . 7 7.2 Storage 7 8 Test temperature 8 9 Test procedure . 8 Figure 2 Types of failure 8 10 Calculation . 9 11 Test report . 9 12 Precision . 9 BS E

20、N 1269723:2017EN 12697-23:2017 (E) 3 European Foreword This document (EN 12697-23:2017) 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

21、identical text or by endorsement, at the latest by May 2018, and conflicting national standards shall be withdrawn at the latest by May 2018. 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 id

22、entifying any or all such patent rights. This document supersedes EN 12697-23:2003. The following is a list of significant technical changes since the previous edition: the series title no longer makes the method exclusively for hot mix asphalt; EN 12697-12 deleted as Normative reference, including

23、any references to EN 12697-12 in this test method; 5.2 addition of device for test specimen with diameter 80 mm and 120 mm; 5.2 Table 1 and Table 2 merged into one Table 1; 6.2 addition of tolerances on diameter for specimens with diameter 80 mm and 120 mm; 6.2 addition of maximum aggregate size for

24、 specimens with diameter 80 mm and 120 mm; 6.5 introduction of requirements for specimen age; 8 test temperature set to + 10 C but opened by references from other standards; 10 unit for ITS amended to kilopascals (kPa). Formula corrected accordingly; 11 bullet g). Unit amended to kilopascals (kPa).

25、According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Ger

26、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1269723:2017EN 12697-23:2017 (E) 4 1 Scope This European Standard specifi

27、es a test method for determining the (splitting) indirect tensile strength of cylindrical specimens of bituminous mixtures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references

28、, 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 - Part 27: Sampling EN 12697-29, Bituminous mixtures - Test method for hot mix asphalt - Part 29: Determination

29、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, Bi

30、tuminous mixtures Test methods for hot mix asphalt Part 32: Laboratory compaction of bituminous mixtures by 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

31、 asphalt - Part 34: Marshall test 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 indirect tensile strength ITS maximum tensile stress calculated from the peak load applied to a cylindrical specimen loaded diametrically until break at specifi

32、ed test conditions 3.2 cylindrical specimen laboratory-made (e.g. gyratory or impact-compacted) cylindrical moulded specimen or core taken from a bituminous layer or slab BS EN 1269723:2017EN 12697-23:2017 (E) 5 4 Principle The cylindrical specimen to be tested is brought to the specified test tempe

33、rature, placed in the compression testing machine between the loading strips, and loaded diametrically along the direction of the cylinder axis with a constant speed of displacement until it breaks. The indirect tensile strength is the maximum tensile stress calculated from the peak load applied at

34、break and the dimensions of the specimen. 5 Apparatus 5.1 Compression testing machine Compression testing machine, Marshall-type conforming to EN 12697-34, or similar apparatus, having a recommended minimum capacity of 28 kN and capable of applying loads to test specimens at a constant rate of defor

35、mation of (50 2) mm/min after a transitory period less than 20 % of the loading time. The rate of deformation shall be maintained. When the test is conducted at low temperatures, on stiff asphalt samples as/or on specimens with diameter of 150 mm or 160 mm, the loading capacity of 28 kN may not be s

36、ufficient in order to reach the indirect tensile strength. In these cases, test devices of higher load capacity can be used. 5.2 Testing head with loading strips Testing head for indirect tensile strength test equipped with loading strips of hardened steel having a concave surface with a radius of c

37、urvature corresponding to the nominal radius of the specimen (see Figure 1). Loading strips for testing of cylindrical specimens shall have a radius of curvature fitting the specimen under test and a width as shown in Table 1. Table 1 Requirements for loading strips Dimensions mm Specimen diameter (

38、mm) 80 2 100 3 120 3 150 3 160 3 Loading strip width, W (mm) 10,2 0,1 12,7 0,2 15,2 0,2 19,1 0,2 20,0 0,2 Maximum height difference at the curved side of the loading strip, h (mm) 0,33 0,40 0,48 0,61 0,63 Dimensions for the curved side are not exactly specified as narrow tolerances could require loa

39、ding strip replacement after very few tests. As the importance of exactly fitting loading strips is not considered essential, slightly larger curvature of loading strips may ease the specimen placement. The loading strips shall have a length of at least equal to the height of the specimen to be test

40、ed. It is recommended that the edges of the loading strips are rounded by grinding to remove the sharp edges in order not to cut the sample during testing. The upper testing head shall be guided to ensure a parallel movement of the loading strips. The upper head may be carried by a spring just capab

41、le of carrying the head to facilitate the handling of the device. BS EN 1269723:2017EN 12697-23:2017 (E) 6 Key 1 testing head 2 loading strips 3 specimen W Width of the loading strip h Maximum height difference at the curved side of the loading strip F load Figure 1 Testing head with loading strips

42、and test specimen 5.3 Measuring device Measuring device capable of determining load to an accuracy of 0,2 kN. 5.4 Water bath Water bath, thermostatically controlled, or air chamber, capable of maintaining the test temperature as selected according to 8 with an accuracy of 1 C in the vicinity of the

43、sample. 5.5 Soft plastic bags Soft plastic bags or other suitable devices for watertight protection of specimens (only required for water bath conditioning). 6 Sample preparation 6.1 Number of specimen At least three specimens shall be prepared for each sample and condition tested. 6.2 Dimensions of

44、 test specimen The cylindrical test specimens shall have a diameter of (80 2) mm, (100 3) mm, (120 3) mm, (150 3) mm or (160 3) mm. BS EN 1269723:2017EN 12697-23:2017 (E) 7 For specimens with: 80 mm nominal diameter, the maximum aggregate size of the bituminous mixture shall not exceed 11 mm; 100 mm

45、 nominal diameter, the maximum aggregate size shall not exceed 22 mm; 120 mm nominal diameter, the aggregate size shall not exceed 31,5 mm; 150 mm and 160 mm nominal diameter, the maximum aggregate size shall not exceed 40 mm. The specimens shall be cylindrical moulded specimens, laboratory-produced

46、 in accordance with EN 12697-30, EN 12697-31 or EN 12697-32, or cores taken from a bituminous slab produced in accordance with EN 12697-33, or cores taken from a bituminous layer in accordance with EN 12697-27. The specimens shall (unless otherwise specified) have a height of between 35 mm and 75 mm

47、. 6.3 Visual examination The specimens shall visually be symmetrical with the curved side even and circular. 6.4 Measurement of dimensions The height and diameter of each test specimen shall be measured in accordance with EN 12697-29. 6.5 Age of Specimen Prior to the start of testing, the specimens

48、shall be stored on a flat surface at a temperature of not more than 25 C for between 48 hours and 42 days from the time of their manufacture. NOTE The storage time influences the mechanical properties of the specimen. For purposes other than type testing, different storage times can be applied. 7 Co

49、nditioning 7.1 Thermal treatment Bring the test specimen to the test temperature selected according to 8 by placing it either: in a water bath, protecting the specimen from the water by enclosing it in a sealed soft plastic bag or other suitable watertight protection and ensuring that that the watertight protection is pressed closely to the surface of the specimen in order to allow adequate heat transmission; or in a thermostatically control