1、 CEN EN*993-b 75 3404589 0096443 735 BRITISH STANDARD Methods of test for Dense shaped refractory products Part 6. Determination of modulus of rupture at ambient temperature The European Standard EN 993-6 : 1995 has the status of a British Standard BS EN BS 1902 : Section 4.4 : 1995 993-6 : 1995 CEN
2、 EN+993-b 95 m 3404589 0096444 671 m BS EN 993-6 : 1995 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Belgium Denmark Finland
3、France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standard Suomen Standardisoimisliito, r. y. Association francaise de normalisation Deutsches Institut fr
4、 Normung e.V. Hellenic Organization for Standardization Technological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Normalisatie-instituut Norges Standardiseringsforbund Instituto Portugus da Qualida
5、de Asociacin Espaola de Normalizacin y Certificacin Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution This British Standard, having been prepared under the direction of the Refractory Products Standards Policy Committee, was published under the
6、authority of the Standards Board and comes into effect on 15 May 1995 Q BSI 1995 Amendments issued since publication Amd. No. I Date 1 Rxt affected The foilowing BSI references relate to the work on this standard: Committee reference RPM/l Draft for comment 93/302938 DC ISBN O 580 23606 4 CEN ENw993
7、-6 95 I 3404587 0096445 508 = BS EN 993-6 : 1995 Contents m3e Cooperating organizations Inside front cover National foreword i Foreword 2 Text of EN 993-6 3 National annex NA (informative) Committees responsible Inside back cover National foreword This British Standard has been prepared under the di
8、rection of the Refractory Products Standards Policy Committee and is the English language version of EN 993-6 : 1995 Methods of test for dense shaped refractory products - Part 6: Determination of modulus of rupture at ambient temperature, published by the European Committee for European Committee f
9、or Standardization (CEN). It supersedes BS 1902 : Section 4.4 : 1984 which is withdrawn. EN 993-6 was produced as a result of international discussions in which the UK took an active part. Compliance with a British Standard does not of itself confer immunity from legal obligations. i EUROPEAN STANDA
10、RD NORME EUROPENNE EUROPISCHE NORM EN 993-6 February 1995 ICs 81.080 Descriptors: Refractory materials, shaped refractories, bend tests, environmental tests, determination, break modulus English version Methods of test for dense shaped refractory products - Part 6: Determination of modulus of ruptur
11、e at ambient temperature Mthodes dessai pour produits rfractaires faconns denses - Erzeugnisse - Partie 6: Dtermination du module de rupture par flexion temprature ambiante Prfverfahren fr dichte geformte feuerfeste Ri1 6: Bestimmung der Biegefestigkeit bei Raumtemperatur This European Standard was
12、approved by CEN on 1995-02-15. CEN members are bound to comply with the CENKENELEC 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
13、standards may be obtained on application to the Central Secretariat or to any CEN member. The 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
14、 to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. C
15、EN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 Copyright reserved to CEN members Ref. No. EN 993-6 : 1995 E hge 2 EN 993-6 : 1995 Foreword This European Standard has been prepared
16、 by Rchnical Committee CEN/TC 187, Refractory products and materials, the secretariat of which is held by BSI. It is closely based on the corresponding International Standard IS0 50 14 Shaped refractory products - Determination of modulus of rupture at ambient temperature, published by the Internati
17、onal Organization for Standardization Reproducibility and repeatability data are not available at present but may be included in a subsequent edition. EN 993 Methods of test for dense shaped refractwy products consists of 18 Parts: (ISO) . Part 1 : Part2: Part3: Part 4 : Part5: Part6: Part7: Part8:
18、PaIt9: Part 10 Determination of bulk density, apparent porosity and true porosity Determination of true density 7st methods for carbon-containing refractories Determination of pemwability to gases Determination of cold crushing strength Detmimtion of modulus of rupture at ambient temperature Determi
19、nation of modulus of rupture at elevated temperatures Determination of rrmtoriness-uncer- load Determination of creep in empression Determination of permanent change in dimensions on heating Part 11 : Determination of resistance to thermal Part 12 : Determination of pyrometric cone Part 13 : Spcij?c
20、ation for pyrometric cows Part 14 : Determination of therrrutl conductivity lart 15 : Determination of therrnal conductivity Part 16 : Determination of resistunce to acids Part 17 : Determination of bulk density of granular material (mercury method) Part 18 : Determination of bulk density of granula
21、r material (water method) shock (Em) equivalent (hot wire, cross-array) (hot wire, parallel) 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 August 1995, and conflicting national standards shall b
22、e withdrawn at the latest by August 1995. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, S
23、weden, Switzerland, United Kingdom. Contents Foreword Scope Definition Principle Apparatus Preparation of test pieces Procedure Expression of results Rst report Page 2 3 3 3 3 3 5 5 5 1 Scope This Part of EN 993 specifies a method for the determination of the modulus of rupture of dense and insulati
24、ng shaped refractory products at ambient temperature, under conditions of a constant rate of increase of stress. The method relates primarily to shaped and fired refractories. If it is to be applied to chemically bonded or tar-bonded bricks, they will usually require some form of preliminary heat tr
25、eatment. This preliminary treatment, the details of which are outside the scope of this standard, is a matter of agreement between the interested parties and shall be described in the test report. 2 Definition For the purposes of this Part of EN 993, the following definition applies. modulus of rupt
26、ure The maximum stress that a prismatic test piece of specified dimensions can withstand when it is bent in a three-point bending device. 3 Principle Loading of test pieces of the product to be tested at a constant rate of increase of stress until failure occurs. 4 Apparatus 4.1 Loading device 4.1.1
27、 The loading device shall have three bearing edges, two to support the test piece and one for the application of the load (see figure 1). The three edges shall have a radius of curvature in accordance with the requirements given in table 1 and shall be of length not less than 5 mm greater than the b
28、readth (b) of the test piece. The line contact of the three edges shall be parallel to each other in a direction perpendicular to the length and the plane of the breadth of the test piece. Two supporting edges shall rest on an intermediate bearing piece, cylindrical on its lower surface, so that eac
29、h edge may rotate independently in a vertical plane to accomodate any slight twist in the test piece. Alternatively, one supporting edge may be fixed, with the other supporting edge and the loadbearing edge being capable of rotation in a vertical plane. The distance between the two supporting edges
30、shall be in accordance with table 2 and the loadbearing edge shall be positioned equidistantly, at f 2 mm from each supporting edge. (See figures 1 and 2). Page 3 EN 993-6 : 1995 4.1.2 The loading device shali be capable of applying a load uniformly across the centre of the test piece and of increas
31、ing it at a uniform rate. A means shall be provided of recording or indicating the load at failure with an accuracy of f 2 %. 4.2 Lkying oven, capable of being controlled at (110 f 5) oc. 5 Preparation of test pieces 5.1 Number 5.1.1 The number of items (for example, bricks shapes, nozzles) to be te
32、sted shall be determined by agreement between the interested parties. 5.1.2 If test pieces are cut out of bricks or blocks, the same number shall be cut from each one, in order to facilitate statistical analysis, NME. The number of test pieces to be cut from each item (which detail is outside the sc
33、ope of this standard) is a matter for agreement between the interested parties. It should be stated in the test report. 5.2 Shape and sixe Each test piece shall be a whole standard rectangular brick (230 mm x 114 mm x 76 mm or 230 mm x 114 mm x 64 mm) or one of the other sizes shown in table 1. 5.3
34、Preparation 5.3.1 Standard size bricks (see 5.2) shall be tested as received. 5.3.2 If test pieces are cut out of bricks, it shall be done in such a way that, if the direction in which the brick was pressed is known, the upper longitudinal face in the testing position (the face in compression) is pa
35、rallel to, or coincides with, one of the original faces of the brick perpendicular to the direction of pressing. NOTE. Cutting with a continuous rim diamond wheel is recommended. If a serrated rim wheel is used, the edges of the cut where the wheel emerges are often frayed; it is therefore recommend
36、ed that such a wheel should enter the face of the brick that is to form the tensile face of the test piece during the test. 5.3.3 The direction of pressing, if known, shall be marked on the test piece. CEN EN*993-b 95 E 3404589 0096449 153 = Page 4 EN 993-6 : 1995 Loading bearing edge Compression fa
37、ce c 1 4 LS Figure 1. Arrangements and dimensions of test piece and bearing edges of loading device for tolerances, see table 1 Test piece 7 Intermediate bearing piece Supporting edge Figure 2. Diagrammatic representation of loading device - Intermediate bearing piece CEN EN*993-b 95 H 3404589 009b4
38、50 975 H Tolerance for the parallelism of the top and bottom faces Page 5 EN 993-6 : 1995 Distance Radius of between curvature for supports Ls the loading edge and bearing 6 Procedure where 230 x 114 x 76 230 x 114 x 64 200 x 40 x 40 150 x 25 x 25 6.1 Dry the test piece to constant mass in the oven
39、(see 4.2), controlled at (110 f 5) OC, cooling it each time away from moisture. 6.2 Measure the breadth and height of each test piece at its mid-point with an accuracy of f 0,l mm and the distance between the supporting edges with an accuracy of f 0,5 mm. 6.3 Place the test piece on the lower bearin
40、g edges of the loading device (see 4.1) so that it rests symmetrically across them. When the test piece is a normal standard brick, the face bearing any brand mark, i.e. the upper face, shall be in compression. If the test pieces have been cut out of the brick, the face of the test piece which corre
41、sponds to the original face of the brick (if it has been preserved) shall be in compression. 6.4 Apply the load vertically on to the test piece until failure occurs. The rate of increase of stress shall be: a) for a dense shaped refractory product or material: 0,15 MFWs f 0,015 MPa/s; b) for a shape
42、d insulating refractory product or material: 0,05 MPa/s f 0,005 MFWs. 6.5 Record the load at which failure of the test piece occurs (Fmax) and the temperature at which the test was conducted. edges - 180 f 1 15 f 0,5 fl f 0,15 f 0,25 180 f 1 5 f 0,5 fl f 0,l f 0,2 125 I 1 5 *0,5 - - 7 Expression of
43、results 7.1 The modulus of rupture OF is the ratio of the bending moment at the point of failure Mmax to the moment of resistance W (the section modulus), and is calculated from the following equation: Fm, is the maximum force exerted on the test piece, in N; L, is the distance between the points of
44、 support of the test piece, in mm; b is the breadth of the test piece, in mm; h is the height of the test piece, in mm. 7.2 The result shall be expressed in megapascals. 7.3 For bricks of standard size, the value obtained for a brick constitutes the result of that item. 7.4 For cut test pieces, reco
45、rd the individual values and the mean value for each item; these constitute the result for that item. 8 Test report The test report shall include the following information: a) the name of the testing establishment; b) the date of the test; e) a reference to this European Standard, i.e. determined in
46、 accordance with EN 993-6; d) the designation of the bricks tested (manufacturer, type, shape, batch number); e) the number of items tested; f) the pretreatment, if any, given to the test pieces (see 1.2); g) the number of test pieces per item; h) the dimensions of the test pieces; i) the position o
47、f the test pieces in the item; j) the distance between the supports; k) the nominal rate of tensile stress increase for each test piece; either 1) the individual values and the mean values of the modulus of rupture for each item (when more than one test piece is cut from each item); or m) the value
48、of the modulus of rupture for each item (when whole bricks are used). 1 %ble 1. Dimensions and tolerances associated with the tests on test pieces of various sizes Rst piece size lxbxh section sides All dimensions are in millimetre: CEN EN*773-b 95 3404589 0096453 801 BS EN 993-6 : 1995 National ann
49、ex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Refractory Products Standards Policy Committee (RPM/-) to Echnical Committee RPM1, upon which the following bodies were represented: British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association British Metallurgical Plant Constructors Association British Steel Industry British Vermiculite Association Refractories Association of Great Britain Refractories Contractors Association Society of Glass
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