ISO INTERNATIONAL STANDARD 5014 Secondedition 1997-07-01 ANsi Internat Doc Sec Dense and insulating shaped refractory products -- Determination of modulus of rupture at ambient temperature Produits refractaires faconnés denses et isolantsDetermination du module de rupture par flexion a temperature ambiante ISO Referencenumber ISO 5014:1997(E) r Standardizatio No reproduction or networking permitted without license from IHS Not for Resale ISO 5014:1997(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 5014 was prepared by Technical Committee ISO/TC 33, Refractories. This second edition cancels and replaces the first edition (ISO 5014:1986), which has been technically revised. CISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 : CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii cense from IHS Not for Resale ISO 5014:1997(E) INTERNATIONAL STANDARD ISO Dense and insulating shaped refractory products - Determination of modulus of rupture at ambient temperature 1 Scope This International Standard specifies a method for the determination of the modulus of rupture of dense and insulating 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 treatment. This preliminary treatment, the details of which are outside the scope of this standard, is a matter of agreement between the interested parties and is described in the test report. 2 Definition For the purposes of this International Standard, the following definition applies: 2.1 modulus of rupture: 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 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 breadth (b) of the test piece (see figure 2). The contact lines 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 each edge may rotate independently in a vertical plane to accommodate any slight twist in the test piece (see figure 2). Alternatively, one supporting edge may be fixed, with the other sup