BS EN 12390-5-2009 Testing hardened concrete Part 5 Flexural strength of test specimens.pdf
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1、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? BS EN 12390-5:2009 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12390-5 February 2009 ICS 91.100.30Supersedes EN 12390-5:2000 English Version Testing hardened concrete - Part 5: Flexural strength of test specimens Essai pour bton du
2、rci - Partie 5: Rsistance la flexion sur prouvettes Prfung von Festbeton - Teil 5: Biegezugfestigkeit von Probekrpern This European Standard was approved by CEN on 27 December 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving th
3、is 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
4、 (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, Bu
5、lgaria, 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 STANDA
6、RDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-5:2009: E BS EN 12390-5:2009 EN 12390-5:2009 (E)
7、 2 Contents Page Foreword 3 1Scope 5 2Normative references 5 3Principle 5 4Apparatus .5 5Test specimens 6 6Procedures .6 7Expression of results 7 8Test report 7 9Precision .8 Annex A (normative) Loading by a centre-point load . 10 ? BS EN 12390-5:2009 EN 12390-5:2009 (E) 3 Foreword This document (EN
8、 12390-5:2009) has been prepared by Technical Committee CEN/TC 104 “ Concrete and related products” , 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 Augus
9、t 2009, and conflicting national standards shall be withdrawn at the latest by August 2009. 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 ri
10、ghts. This document supersedes EN 12390-5:2000. It is recognized good practice to include measurement of density prior to the determination of flexural strength, as a check on compaction of the concrete. The two-point method of loading has been taken as the reference method, but the use of centre-po
11、int loading has been included as a normative annex. An inter-comparison of the two-point and the centre-point methods has been made as part of a test programme, part-funded by the EC under the Measurement and Testing Programme, contract MAT I-CT-94-CO43. The centre-point method gave results which we
12、re consistently 13 % higher than those from the two-point method. This standard is one of a series concerned with testing concrete. The series EN 12390 includes the following parts: EN 12390 Testing hardened concrete Part 1: Shape, dimensions and other requirements for specimens and moulds; Part 2:
13、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; Part 7: Density of hardened concrete;
14、Part 8: Depth of penetration of water under pressure. The following amendments have been made to the 2000-10 edition of this standard: editorial revision selected loading rate to be applied after the initial (not exceeding approx 20% of the anticipated failure load) According to the CEN/CENELEC Inte
15、rnal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, ? BS EN 12390-5:2009 EN 1
16、2390-5:2009 (E) 4 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. ? BS EN 12390-5:2009 EN 12390-5:2009 (E) 5 1 Scope This European Standard specifies a method for the determination of the flexural st
17、rength of specimens of hardened concrete. 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 references, the latest edition of the referenced document (including any amend
18、ments) applies. EN 12350-1, Testing fresh concrete Part 1: Sampling EN 12390-1:2000, Testing hardened concrete Part 1: Shape, dimensions and other requirements for test specimens and moulds EN 12390-2, Testing hardened concrete Part 2: Making and curing specimens for strength tests EN 12390-4, Testi
19、ng hardened concrete Part 4: Compressive strength Specification for testing machines 3 Principle Prismatic specimens are subject to a bending moment by the application of load through upper and lower rollers. The maximum load sustained is recorded and the flexural strength is calculated. 4 Apparatus
20、 4.1 Testing machine The test shall be carried out using a testing machine conforming to EN 12390-4. 4.2 Force application The device for applying loads (see Figure 1) shall consist of: 1) two supporting rollers; 2) two upper rollers carried by an articulated cross member, which divides the load app
21、lied by the machine equally between the two rollers. All rollers shall be manufactured from steel and shall have a circular cross-section with a diameter of 20 mm to 40 mm. They shall be at least 10 mm longer than the width of the test specimen. Three rollers, including the two upper ones, shall be
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