BS EN 12390-6-2009 Testing hardened concrete - Tensile splitting strength of test specimens《硬化混凝土试验 试样的抗拉伸撕裂强度》.pdf

《BS EN 12390-6-2009 Testing hardened concrete - Tensile splitting strength of test specimens《硬化混凝土试验 试样的抗拉伸撕裂强度》.pdf》由会员分享，可在线阅读，更多相关《BS EN 12390-6-2009 Testing hardened concrete - Tensile splitting strength of test specimens《硬化混凝土试验 试样的抗拉伸撕裂强度》.pdf（14页珍藏版）》请在麦多课文档分享上搜索。

1、BS EN12390-6:2009ICS 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTesting hardenedconcretePart 6: Tensile splitting strength of testspecimensLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIThis Briti

2、sh Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 June2010 BSI 2010ISBN 978 0 580 67068 8Amendments/corrigenda issued since publicationDate CommentsBS EN 12390-6:2009National forewordThis British Standard is the UK implementation of EN 12390-6:2009. Itsup

3、ersedes BS EN 12390-6:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/1, Concrete production and testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to inc

4、lude all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EUROP

5、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12390-6 December 2009 ICS 91.100.30 Supersedes EN 12390-6:2000English Version Testing hardened concrete - Part 6: Tensile splitting strength of test specimens Essais sur bton - Partie 6 : Dtermination de la rsistance en traction par fendage dprouvettes

6、 Prfung von Festbeton - Teil 6: Spaltzugfestigkeit von Probekrpern This European Standard was approved by CEN on 1 November 2009. 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 standa

7、rd 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 l

8、anguage 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, Cyprus, Czech Republic, Denmark, Estonia, Fi

9、nland, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES

10、 KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-6:2009: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy

11、, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 2 Contents Page Foreword 3 Introduction .41 Scope 52 Normative references 53 Principle 54 Apparatus .55 Test specimens 66 Procedure .77 Expression of results 88 Test report 99 Precision .9Annex A (normative) Determination of tensile splitting strength u

12、sing cubic or prismatic specimens . 10Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 3 Foreword This document (EN 12390-6:2009) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products

13、”, 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 June 2010, and conflicting national standards shall be withdrawn at the latest by June 2010. Attention i

14、s 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 document supersedes EN 12390-6:2000. This document has been prepared under a mandate given t

15、o CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This standard is one of a series concerned with testing concrete. EN 12390, Testing hardened concrete consists of the following parts: Part 1: Shape, dimensions and other

16、 requirements of specimens and moulds Part 2: Making and curing specimens for strength tests Part 3: Compressive strength of test specimens Part 4: Compressive strength Specification for testing machines Part 5: Flexural strength of test specimens Part 6: Tensile splitting strength of test specimens

17、 Part 7: Density of hardened concrete Part 8: Depth of penetration of water under pressure The main change from the previous edition of this European Standard has been to provide an alternative specification for packing strips and requires the selected loading rate to be applied after the initial lo

18、ad does not exceed approximately 20 % of the anticipated failure load. 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, Cyprus, Czech Republic, Denmark, Estoni

19、a, 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. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12,

20、 Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 4 Introduction This test method was one of a number examined in a laboratory inter-comparison part-funded by the EC under Measurement and Testing programme, contract MAT1-CT94-0043. The programme and other references showed the followi

21、ng: a) Tensile splitting strengths measured between the normal plane platens of testing machines gave the same results as those using the special curved platens, originally described in ISO 4018. Although, therefore these curved platens have been optionally retained in this standard, they are not ne

22、cessary for the measurement. b) The material used for the packing strips affects the apparent tensile strength measured. This has led to the decision to standardize on hardboard strips, since they provided the lowest standard deviations. c) The apparent tensile strength measured depends upon the sha

23、pe and size of the test specimen used: 1) cubes gave higher measured tensile strengths than cylinders, by approximately 10 %; 2) 150 mm cubes gave lower measured tensile strengths than 100 mm cubes; 3) the effect of cylinder size on measured tensile strength was not found to be significant, possibly

24、 due to the variability of the data. As a result of these conclusions from the laboratory programme, this standard restricts the measurement of tensile splitting strength to cylindrical specimens used with hardboard packing strips, which is the reference method. However, as some countries still test

25、 cubical or prismatic specimens, their use has been retained in a normative annex. In cases of dispute, the reference method is the use of cylinders of 150 mm diameter and 300 mm length. It is recognized good practice to include measurement of density prior to the determination of tensile splitting

26、strength, as a check on compaction. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 5 1 Scope This European Standard specifies a method for the determination of the tensile splitting strength of cylindrical test

27、 specimens of hardened concrete. A method using cubic or prismatic specimens is included in normative Annex A. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated reference

28、s, the latest edition of the referenced document (including any amendments) applies. EN 12350-1, Testing fresh concrete Part 1: Sampling EN 12390-1, Testing hardened concrete Part 1: Shape, dimensions and other requirements of specimens and moulds EN 12390-2, Testing hardened concrete Part 2: Making

29、 and curing specimens for strength tests EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machines EN 316, Wood fibre boards Definition, classification and symbols 3 Principle A cylindrical specimen is subjected to a compressive force applied to a narrow r

30、egion along its length. The resulting orthogonal tensile force causes the specimen to fail in tension. 4 Apparatus 4.1 Testing machine, conforming to EN 12390-4, curved steel loading pieces may be used in place of conventional plane platens, when tests are carried out on cubic or prismatic specimen.

31、 4.2 Jig (optional), for positioning the specimen and the packing strips. The jig shall not restrict the deformation of the specimen during the test. NOTE Suitable jig for cylindrical specimens is shown in Figure 1. 4.3 Packing strips, conforming to EN 316, made of hardboard, of density equal or gre

32、ater than 900 kg/m and dimensions, width (a) = (15 1) mm; thickness (t) = (4 1) mm and a length greater than the length of the line of contact of the test specimen. Alternatively, packing strips may be used if they meet the following hardness criterion: When submitted to a punching test by means of

33、a rod of circular cross section, having a diameter of (16 0,5) mm and applying a force at a rate of (48 10) kN/min, the instantaneous penetration when the force of (20 5) kN is achieved shall be equal to (1,2 0,4) mm. Packing strips shall be used only once. Licensed Copy: Wang Bin, ISO/EXCHANGE CHIN

34、A STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 6 Key 1 Steel loading piece 2 Hardboard packing strips L Length of specimen d Diameter of specimen Figure 1 Jig for testing cylindrical specimens 5 Test specimens 5.1 General The test specimens shall be cy

35、lindrical, conforming to EN 12390-1, but a length/diameter ratio as low as 1 shall be acceptable for cores. Specimens cast in moulds shall conform to EN 12390-1 and EN 12390-2. The specimens shall be examined and any abnormalities observed shall be reported. 5.2 Adjustment of test specimens Where th

36、e dimensions or shapes of the test surfaces of the specimens do not conform to EN 12390-1, because they exceed the respective tolerances, they shall be rejected or adjusted to comply with the standard as follows: a) uneven surfaces shall be levelled by grinding; b) the deviation of angles shall be c

37、orrected by cutting and/or grinding. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 7 5.3 Marking Unless a centring jig is used, two lines shall be marked along which to apply the load. These lines shall be opp

38、osite each other in an axial plane and the extremities of the two lines shall be connected over each end of the specimen, to define clearly the plane of loading. 6 Procedure 6.1 Specimen preparation For specimens stored in water, wipe any excess moisture from the surface of the specimen before placi

39、ng in the testing machine. Wipe the bearing surfaces of the jig, packing strips, loading pieces and platens. Clean and remove any loose grit or other extraneous material from the surface of the specimen that will be in contact with the packing strips. 6.2 Specimen positioning Place the test specimen

40、 centrally in the testing machine, optionally using a jig. Carefully position packing strips and, if required, loading pieces, along the top and bottom of the plane of loading of the specimen. Ensure that the upper platen is parallel with the lower platen, during loading. Dimensions in millimetres K

41、ey 1 Steel loading piece d Height of specimen 2 Hardboard packing strips R Radius of loading piece 3 Segment may be trimmed a Width of packing strip L Length of specimen t Thickness of packing strip Figure 2 Curved loading pieces Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:1

42、2, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 8 6.3 Loading Ensure that the specimen remains centred when the load is first applied, either by means of a jig or by temporary supports. Select a constant rate of stress within the range 0,04 MPa/s (N/mms) to 0,06 MPa/s (N/mms). Aft

43、er the application of the initial load, which does not exceed approximately 20 % of the failure load, apply the load to the specimen without shock and increase continuously, at the selected constant rate 10 %, until no greater load can be sustained. The required loading rate is given by the formula:

44、 2dLsR=where: R is the required loading rate, in Newtons per second (N/s); L is the length of the specimen, in millimetres (mm) (see Figure 2); d is the designated cross-sectional dimension, in millimetres (mm); s is the stress rate, in megapascals per second (MPa/s) or in Newtons per square millime

45、tre per second (N/mms). When using manually controlled testing machines, correct any tendency for the selected rate of loading to decrease, as specimen failure is approached, by appropriate adjustment of the controls. When using automatically controlled testing machines, check the rate of loading pe

46、riodically, to ensure that the rate is constant. Record the maximum load indicated. 6.4 Examination of specimen Examine the fractured specimen and the appearance of the concrete and record, if unusual. 7 Expression of results The tensile splitting strength is given by the formula: dLFf=2ctwhere ctf

47、is the tensile splitting strength, in megapascals (MPa) or in Newtons per square millimetre (N/mm); F is the maximum load, in Newtons (N); L is the length of the line of contact of the specimen, in millimetres (mm); d is the designated cross-sectional dimension, in millimetres (mm). Licensed Copy: W

48、ang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/09/2010 07:12, Uncontrolled Copy, (c) BSIBS EN 12390-6:2009EN 12390-6:2009 (E) 9 NOTE For deviations from the standard method in respect of the dimensions of the specimen, the strength calculation may be based on the actual dimensions of the test specimen. E

49、xpress the tensile splitting strength to the nearest 0,05 MPa (or N/mm). 8 Test report The test report shall include: a) identification of the test specimen; b) details of adjustment (if appropriate); c) surface moisture condition at time of test; d) date of test; e) appearance of concrete and type of fracture (if unusual); f) tensile splitting strength of specimen, to nearest 0,05 MPa (or N/mm); g) any deviation from the standard test method; h) a declaration from th