1、STDmBSI BS EN L2390-4-ENGL 2000 lib24bb9 0860720 359 BRITISH STANDARD Testing hardened concrete - Part 4: Compressive strength - Specification for testing machines The European Standard EN 12390-4:2000 has the status of a British Standard ICs 91.100.30 BS EN 1239042000 NO COPYING WITHOUT BSI PERMISS
2、ION EXCEPT AS PERMITTED BY COPYBIGH” LAW BS EN 12390-4:2000 been prepared under the Committee for Building and Civii Engineexhg, was published under the authority of the Standards Committee and comes into effect on 15 July 2 direction of the Sector AmdNo. Q BSI 07-2000 ISBN O 580 88400 8 National fo
3、reword Date Comments This British Standar is the official English language version of EN 1239042000. It will supersede Bs 1881-115:1986, which will be withdrawn in 2003 when the full package of the related concrete package is avauable. The UK parkipation in its preparation was entrusted by Technid c
4、ommittee 3517, Concrete, to Subcommittee B/517/1, production and testing, which has the responsibility ta - aid enquirers to undemtand the text; - present to the responsible European committee any enquiries on the - monitor related internaionai and European developments and promulgate interpretation
5、, or propods for change, and keep the UK interess informe them in the UK. A list of organizaons represented on this subcommittee can be obtained on request to its secrem. Cross-references The British Standards which implement intemational or European publications referred to in this document may be
6、found in the BSI Standards catalogue under the section entitled International Standards Correspondence Index“, or by using the “Findm facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Usern of British standa
7、rds are responsible for their correct applicatjon. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 16 and a back cova. The BSI copyright notice d
8、isplayed in this document indicates when the document waslastissued STD.BSI BS EN 12390-4-ENGL 2000 lb24bb9 0860922 521 - EUROPEAN STANDARD NORME EUROPEENNE EUROPASCHE NORM EN 12390.4 April 2000 ICs 91.100.30 English version Testing hardened concrete - Part 4: Compressive strength - Specification fo
9、r testing machines Essais pour bton durci - Partie 4: Rsistance en compression - Charactristiques des machines dessai Prfung von Festbeton -Teil 4: Bestimmung der Druckfestigkeit - Anforderungen an Prufmaschinen This European Standard was approved by CEN on 1 November 1999 CEN members are bound to c
10、omply with the CENICENELEC 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 sich national standards may be obtained on application to the Central
11、Secretariat or to any CEN member. This European Standard exists in three oficial versions (English, French, German). A version in any other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as he of
12、ficial versions. 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. EUROPEAN COMMITTEE FOR STANDARDIZATION EUR
13、OPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Central Secretariat: rue de Stassart, 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 123904:2000 E STD=BSI BS EN 12390-4-ENGL 2000 Lb24bb9 08b092
14、3 4b8 D Page 2 EN 1239042000 Contents Page 2 Foreword 1 scope 3 2 References 3 3 Definitions . 4 4 Construction of machines 4 5 Machine calibration . 8 6 Details to be provided by the supplier/manufacturer 8 Annex A (normative) Strain gauged column and proving procedure for compression testing machi
15、nes 9 Annex B (normative) Force calibration procedures . .I 2 Foreword 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. This European Standard shall be given the s
16、tatus of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2000, and conflicting national standards shall be withdrawn at the latest by December 2003. According to the CENICENELEC Internal Regulations, the national standards organizations of
17、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. This standard is one of a series
18、concerned with testing concrete. During the 1980s a number of countries found it necessary to introduce standards to specify more precisely the performance of compression machines for testing concrete specimens. This standard has been written to continue this movement and to overcome the present lac
19、k of a European Standard. A drafl for this standard was published in 1996 for CEN enquiry as prEN 12390. 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 drafl standards into three new stand
20、ards with separate parts for each method, as follows: - Testing fresh concrete (EN 12350); - Testing hardened concrete (EN 12390); - Testing concrete in structures (EN 12504). Q BSI 07-2000 Page 3 EN 123904:2000 This series, EN 12390, includes the following parts where the brackets give the numbers
21、under which the particular test methods were published for CEN enquiry: Part 1: Part 2: Part 3: Part 4: Part 5: Part 6: Part 7: Part 8: Shape, dimensions and other requirements of specimens and moulds (former prEN 12356:1996); Making and curing specimens for strength tests (former prEN 12379:1996);
22、Compressive strength of test specimens (former prEN 12394:1996); Compressive strength - Specification for testing machines (former prEN 12390:1996); Flexural strength of test specimens (former prEN 12359:1996); Tensile splitting strength of test specimens (former prEN 12362:1996); Density of hardene
23、d concrete (former prEN 12363:1996); Depth of penetration of water under pressure (former prEN 12364:1996). Three classes of testing machines are currently recognized, corresponding to scale accuracies of 1 %, 2 % and 3 %. It is evident that these accuracy classes have a direct impact upon the accur
24、acy of the test result and it is a matter for each country to decide whether to limit the range of machine classes to, for example, 1 % and 2 %. The requirement in this standard for the manner of force transfer is also important with regard to the effect upon measured compressive strength. However,
25、the requirement can be difficult to satisfy on some older testing machines. It is therefore a matter for each country to decide whether, at present, this requirement shall apply only to new machines as wriien in this standard or whether it shall appiy immediately to all machines. The requirements fo
26、r testing machines set out in this standard have been formulated to satisfy the needs of those compressive tests on concrete specimens which are specified in EN 206. Machines conforming to this standard can be suitable for other uses, but this needs to be carefully considered on an individual test b
27、asis. Particular care needs to be taken before using machines conforming to this standard for compressive tests on small specimens, e.g. those with lateral dimensions significantly less than 100 mm. The main concern is that the ball-seating fitted to the upper platen can be too large to align satisf
28、actorily on the top of such small specimens and special adaptations can be required. Another concern is the ability to accurately determine the failure load of small or low strength specimens. I Scope This standard specifies the requirements for the performance of compression testing machines for th
29、e measurement of the compressive strength of concrete. 2 References This European Standard incorporates by dated and 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
30、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. EN IS0 7500-1 : 1999 Metallic materials - Verificati
31、on of static uniaxial testing machines - Part 1 : Tensionkompression testing machines; verification and calibration of the force-measuring system (IS0 7500-1 :1999). EN 10002-3 Metallic materials - Tensile testing - Part 3: Calibration of force proving instruments for the verification of uniaxial te
32、sting machines. prEN 12390-1:1999 Testing hardened concrete - Part 1 : Shape, dimensions and other requirements of specimens and moulds. IS0 6507-1 Metallic materials - Vickers hardness test - Part 1 : Test method. IS0 4287: 1997 Geometrical Product Specification (GPS) - Surface texture: Profile met
33、hod - Terms, definitions and surface texture parameters. O BSI 07-2000 Page 4 EN 1239042000 3 Definitions For the purposes of this standard the following definfions apply. 3.1 auxiliary platen separate platen used to protect the machine platens, usually of a size equal to the designated size of the
34、specimen being tested 3.2 contact area the part of the platen that comes into contact with the specimen 3.3 indicated force the force indicated on the machine scale(s) or display 3.4 indication range the total force range, from zero to maximum, displayed on the machine 3.5 machine platens lower plat
35、en and upper platen with spherical seating both centred on the central vertical axis of the machine 3.6 measuring range that part of an indication range over which the machine conforms with the accuracy values specified in this standard 3.7 relative accuracy error of 3.7.1 true force the difference
36、between the average indicated force and the true force expressed as a percentage of the true force 3.7.2 indicated force the difference between the average true force and the indicated force expressed as a percentage of the indicated force 3.8 relative repeatability error of 3.8.1 true force the gre
37、atest difference between the indicated forces corresponding to repeated applications of a true force expressed as a percentage of the true force 3.8.2 indicated force the greatest difference between the true forces corresponding to repeated applications of an indicated force expressed as a percentag
38、e of the indicated force 3.9 resolution of force the smallest increment of force that can be assessed, estimated, or read on any force indication range (see annex B) 3.10 spacing block metal block used to adjust the space available to test specimens 3.11 true force the force indicated on a calibrate
39、d force proving device 4 Construction of machines 4.1 Machine platens, auxiliary platens and spacing blocks NOTE 1 : The use of auxiliary platens is optional. 4.1.1 Machine and auxiliary platens shall be made of a material which shall not deform irreversibly when the machine is used. Q BSI 07-2000 S
40、TD.BS1 BS EN 12390-4-ENGL 2000 - 1b24bb 0860926 177 Page 5 EN 12390-4:2000 4.1.2 Machine and auxiliary platens shall have a hardness value of at least 550 HV 30 (HRC 53) when tested in accordance with IS0 6507-1. 4.1.3 The flatness tolerance for machine piatens and auxiliary platens shall be 0,03 mm
41、 for the area in contact with the specimen. NOTE 2: For the purpose of this European Standard, flatness can be assessed by the measurement of straightness in four positions (see annex B of prEN 12390-1 :1999). 4.1.4 The roughness value (Ra) for the surface texture of machine and auxiliary platens sh
42、all be in the range 0,4 Pm to 3,2 Pm, when assessed in accordance with ISO/R468, for the area in contact with the specimens. 4.1.5 The area of machine platens in contact with the specimen shall be at least as great as the area of the specimen being tested. 4.1.6 The distance between either pair of o
43、pposite edges of a square auxiliary platen, or the diameter of a circular auxiliary platen, shall be not less than the designated size of the specimen. 4.1.7 The two contact faces of an auxiliary platen shall be parallel to a tolerance of 0,05 mm. 4.1.8 Auxiliary platens shall be at least 23 mm thic
44、k. 4.1.9 If there is a requirement to reduce the distance between the machine platens, up to four spacing blocks may be used. 4.1.10 A spacing block may be either circular or square in section and shall be adequately supported from below. NOTE 3: A minimum diameter or length of side of 200 mm is rec
45、ommended for spacing blocks. 4.1.1 1 Spacing blocks shall comply with the flatness and parallelism tolerances required for auxiliary platens (see clauses 4.1.3 and 4.1.7). 4.1.12 Spacing blocks shall not be placed in contact with the specimen. 4.1.13 Spacing blocks shall be positively located, centr
46、ally on the vertical machine axis. 4.2 Force measurement 4.2.1 Force indicator The machine shall be provided with: - dials or digital displays which allow the force to be read to the required accuracy (see 6.1.2); - a system which allows the maximum force sustained to be read after completion of the
47、 test, until reset; - displays readable from the operating position. The lowest verifiable value (see 8.1.4) of each measuring range shall be less than or equal to 20 % of the maximum value of the range. If the machine is equipped with several indication ranges, the above requirement shall apply to
48、each range. The machine force indication system shall not be affected by explosive failure of the specimen. 4.2.2 Force indicator calibration Force indicators shall be verified and shall conform to the requirements of Table 1 for the particular class of testing machine. Q BSI 07-2000 Page 6 EN 12390
49、-4:2000 Machine class Relative accuracy Relative Relative zero error error repeatability error (% of scale %2) %2) maximum) %2) I I1 ,o 1 ,o *0,2 2 - at a temperature of (20 f I O) OC; - at a relative humidity of up to 80 %. NOTE: Where electrical or other interference exists this can affect the accuracy of force indication and special provisions to overcome this interference can be necessary. 4.2.5 Deviation in linearity If a DC output, proportionate to the indicated force is provided, the linearity deviation of the output voltage - expressed as a percentage of the m
