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<ul><li><p>BRITISH STANDARD BS EN 12390-6:2000Incorporating Corrigendum No.1</p><p>Testing hardened </p><p>concrete </p><p>Part 6: Tensile splitting strength of test specimens</p><p>The European Standard EN 12390-6:2000 has the status of a British Standard</p><p>ICS 91.100.30</p></li><li><p>BS EN 12390-6:2000</p><p>This British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Policy and Strategy Committee on 15 December 2000</p><p> BSI 17 November 2004</p><p>ISBN 0 580 36606 5</p><p>National foreword</p><p>This British Standard is the official English language version of EN 12390-6:2000, including Corrigendum September 2004. It will supersede BS 1881-117:1983, which will be withdrawn in 2003 when the full package of concrete standards is available.</p><p>The UK participation in its preparation was entrusted to Technical Committee B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing, which has the responsibility to:</p><p>A list of organizations represented on this subcommittee can be obtained on request to its secretary.</p><p>Cross-references</p><p>The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled International Standards Correspondence Index, or by using the Search facility of the BSI Electronic Catalogue or of British Standards Online.</p><p>This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.</p><p>Compliance with a British Standard does not of itself confer immunity from legal obligations.</p><p> aid enquirers to understand the text;</p><p> present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;</p><p> monitor related international and European developments and promulgate them in the UK.</p><p>Summary of pages</p><p>This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover.</p><p>The BSI copyright notice displayed in this document indicates when the document was last issued.</p><p>Amendments issued since publication</p><p>Amd. No. Date Comments</p><p>15439 Incorporating Corrigendum No.1</p><p>17 November 2004 Amended foreword and changes to subclause 6.3</p></li><li><p>EUROPEAN STANDARD </p><p>NORME EUROPENNE </p><p>EUROPISCHE NORM </p><p> EN 12390-6 </p><p> October 2000 </p><p>ICS 91.100.30 Incorporating corrigendum September 2004 </p><p>English version </p><p>Testing hardened concrete - Part 6: Tensile splitting strength of test specimens </p><p>Essai pour bton durci - Partie 6: Rsistance en traction par fendage d'prouvettes </p><p>Prfung von Festbeton - Teil 6: Spaltzugfestigkeit von Probekrpern </p><p>This European Standard was approved by CEN on 18 February 2000. </p><p>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 Management Centre or to any CEN member. </p><p>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 Management Centre has the same status as the official versions. </p><p>CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. </p><p>EUROPEAN COMMITTEE FOR STANDARDIZATION </p><p>C O M I T E U R O P E N D E N OR M A LI S A T I O N</p><p>EUR O P IS C HES KOM I T EE F R N OR M UNG </p><p>Management Centre: rue de Stassart, 36 B-1050 Brussels </p><p> 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. </p><p>Ref. No. EN 12390-6:2000 E</p></li><li><p>Page 2 EN 12390-6:2000 </p><p>Contents </p><p>Page </p><p>Foreword ...................................................................................... 3 </p><p>1 Scope ...................................................................................... 4 </p><p>2 Normative references......................................................................... 4 </p><p>3 Principle.................................................................................... 4 </p><p>4 Apparatus .................................................................................. 4 </p><p>5 Test specimens.............................................................................. 5 </p><p>6 Procedures ................................................................................. 6 </p><p>7 Expression of results......................................................................... 7 </p><p>8 Test Report................................................................................. 8 </p><p>9 Precision................................................................................... 8 </p><p>Annex A (normative) Determination of tensile splitting strength using cubic or prismatic specimens ...... 9 </p><p>Figure 1 - Jig for testing cylindrical specimens...................................................... 5 </p><p>Figure 2 - Curved loading piece ................................................................... 7 </p></li><li><p>Page 3 EN 12390-6:2000 </p><p>Foreword </p><p>This European Standard has been prepared by Technical Committee CEN/TC 104, Concrete (performance, production, placing and compliance criteria), the Secretariat of which is held by DIN. </p><p>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 April 2001, and conflicting national standards shall be withdrawn at the latest by December 2003. </p><p>According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. </p><p>This standard is one of a series concerned with testing concrete. </p><p>It is based on the International Standard ISO 4108 Concrete Determination of tensile splitting strength of test specimens. </p><p>It is recognized good practice to include measurement of density prior to the determination of tensile splitting strength, as a check on compaction. </p><p>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 following: </p><p>a) Tensile splitting strengths measured between the normal plane platens of testing machines, gave the same resultsas 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 necessary for the measurement. </p><p>b) The material used for the packing strips affects the apparent tensile strength measured. This has led to thedecision to standardize on hardboard strips, since they provided the lowest standard deviations. </p><p>c) The apparent tensile strength measured depends upon the shape and size of the test specimen used:</p><p> cubes gave higher measured tensile strengths than cylinders, by approximately 10 %;</p><p> 150 mm cubes gave lower measured tensile strengths than 100 mm cubes;</p><p> the effect of cylinder size on measured tensile strength was not found to be significant, possibly due to thevariability of the data. </p><p>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 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. </p><p>A draft for this standard was published in 1996 for CEN enquiry as prEN 12362. It was one of a series of individually numbered test methods for fresh or hardened concrete. For convenience it has now been decided to combine these separate draft standards into three new standards with separate parts for each method, as follows: </p><p>- Testing fresh concrete (EN 12350) </p><p>- Testing hardened concrete (EN 12390) </p><p>- Testing concrete in structures (EN 12504) </p></li><li><p>Page 4 EN 12390-6:2000 </p><p>The series EN 12390 includes the following parts where the brackets give the numbers under which particular test methods were published for CEN enquiry: </p><p>EN 12390 Testing hardened concrete - </p><p>Part 1: Shape, dimensions and other requirements of specimens and moulds (former prEN 12356:1996) Part 2: Making and curing specimens for strength tests (former prEN 12379:1996) Part 3: Compressive strength of test specimens (former prEN 12394:1996) Part 4: Compressive strength - Specification for testing machines (former prEN 12390:1996) Part 5: Flexural strength of test specimens (former prEN 12359:1996) Part 6: Tensile splitting strength of test specimens (former prEN 12362:1996) Part 7: Density of hardened concrete (former prEN 12363:1996) Part 8: Depth of penetration of water under pressure (former prEN 12364:1996) </p><p>1 Scope </p><p>This standard specifies a method for the determination of the tensile splitting strength of cylindrical test specimens of hardened concrete. A method using cubic or prismatic specimens is included in annex A (normative). </p><p>2 Normative references </p><p>This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). </p><p>EN 12350-1, Testing fresh concrete Part 1: Sampling. </p><p>EN 12390-1, Testing hardened concrete Part 1: Shape, dimensions and other requirements of specimens and moulds. </p><p>EN 12390-2, Testing hardened concrete Part 2: Making and curing specimens for strength tests. </p><p>EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machines. </p><p>EN 316, Wood fibreboards - Definition, classification and symbols. </p><p>3 Principle </p><p>A cylindrical specimen is subjected to a compressive force applied to a narrow region along its length. The resulting orthogonal tensile force causes the specimen to fail in tension. </p><p>4 Apparatus </p><p>4.1 Testing machine, of EN 12390-4. </p><p>Curved steel loading pieces may be used in place of conventional plane platens, when tests are carried out on cubic or prismatic specimen. </p><p>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. </p><p>NOTE A suitable jig for cylindrical specimens is shown in figure 1. </p></li><li><p>Page 5 EN 12390-6:2000 </p><p>4.3 Packing strips, conforming to EN 316, made of hardboard, of density &gt; 900 kg/m and dimensions, width (a) = (10 1) mm; thickness (t) = (4 1) mm and a length greater than the length of the line of contact of the test specimen. Hardboard packing strips shall be used only once. </p><p>Dimensions in millimetres </p><p>Key 1 Steel loading piece 2 Hardboard packing strips </p><p>Figure 1 - Jig for testing cylindrical specimens </p><p>5 Test specimens </p><p>5.1 General </p><p>The test specimens shall be cylindrical, 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 12350-1 and EN 12390-2. </p><p>The specimens shall be examined and any abnormalities observed shall be reported. </p><p>5.2 Adjustment of test specimens </p><p>Where the dimensions or shapes of test specimens do not conform to EN 12390-1, because they exceed the respective tolerances, they shall be rejected or adjusted as follows: </p><p> uneven surfaces shall be levelled by grinding;</p><p> the deviation of angles shall be corrected by cutting and/or grinding.</p><p>5.3 Marking </p><p>Unless a centring jig is used, two lines shall be marked along which to apply the load. These lines shall be opposite 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. </p></li><li><p>Page 6 EN 12390-6:2000 </p><p>6 Procedures </p><p>6.1 Specimen preparation </p><p>For specimens stored in water, wipe any excess moisture from the surface of the specimen before placing in the testing machine. </p><p>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. </p><p>6.2 Specimen positioning </p><p>Place the test specimen 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. </p><p>Ensure that the upper platen is parallel with the lower platen, during loading. </p><p>6.3 Loading </p><p>Ensure that the specimen remains centred when the load is first applied, either by means of a jig or by temporary supports. </p><p>Select a constant rate of loading within the range 0,04 MPa/s (N/mm x s) to 0,06 MPa/s (N/mm x s). Apply the load without shock and increase continuously, at the selected constant rate 10 %, until no greater load can be sustained. </p><p>NOTE The required loading rate on the testing machine is given by the formula: </p><p>2</p><p>xxxR</p><p>d L s = </p><p>where: </p><p>R is the rate of increase of load, in newtons per second; </p><p>L is the length of the specimen, in millimetres (see Figure 2); </p><p>d is the designated dimension of the specimen, in millimetres; </p><p>s is the increase in rate of stress, in..</p></li></ul>