01442095 PDF BRITISH STANDARD BS EN 1742 1998 Determination of shear strength between different layers of multilayer components made of autoclaved aerated concrete or lightweight aggregate concrete wi[.]
BRITISH STANDARD Determination of shear strength between different layers of multilayer components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure The European Standard EN 1742:1998 has the status of a British Standard ICS 91.100.30 BS EN 1742:1998 BS EN 1742:1998 National foreword This British Standard is the English language version of EN 1742:1998 The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregated concrete with open structure, which has the responsibility to: — aid enquirers to understand the text; — present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; — monitor related international and European developments and promulgate them in the UK A list of organizations represented on this committee can be obtained on request to its secretary Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application 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, pages i and ii, the EN title page, pages to and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 November 1998 © BSI 05-1999 ISBN 580 30147 Amendments issued since publication Amd No Date Comments BS EN 1742:1998 Contents National foreword Foreword Text of EN 1742 © BSI 05-1999 Page Inside front cover i ii blank EUROPEAN STANDARD EN 1742 NORME EUROPÉENNE April 1998 EUROPÄISCHE NORM ICS Descriptors: Concrete, cellular concrete, aggregates, reinforcing materials, prefabricated elements, mechanical tests, shear tests, determination, shear strength, test specimen English version Determination of shear strength between different layers of multilayer components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure Détermination de la résistance au cisaillement entre des différentes couches d’éléments multicouches réalisés en béton cellulaire autoclavé ou en béton de granulats légers strucuture ouvert Bestimmung der Scherfestigkeit zwischen den verschiedenen Schichten mehrschichtiger Bauteile aus dampfgehärtetem Porenbeton oder haufwerksporigem Leichtbeton This European Standard was approved by CEN on 25 March 1998 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 Central Secretariat or to any CEN member 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 Central Secretariat has the same status as the official 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 CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No 1742:1998 E EN 1742:1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 177, Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure, the secretariat of which is held by DIN In order to meet the performance requirements as laid down in the product standards for prefabricated components of autoclaved aerated concrete and of lightweight aggregate concrete with open structure, a number of standardized test methods are necessary 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 October 1998, and conflicting national standards shall be withdrawn at the latest by October 1998 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 United Kingdom Contents Foreword Scope Normative references Principle Apparatus Test specimens 5.1 Sample 5.2 Shape and size of test specimens 5.3 Number of test specimens 5.4 Preparation of test specimens 5.5 Measurement of test specimens 5.6 Conditioning of test specimens Testing procedure Test results Test report Figure — Typical test set-up Page 3 3 3 3 3 4 5 © BSI 05-1999 EN 1742:1998 Scope This European Standard specifies a method of determining the shear strength under short-term loading between the different layers of prefabricated multilayer components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweight aggregate concrete with open structure (LAC) according to prEN 1520 This test method is suitable only for evaluation of conformity purposes during production of multilayer components Normative references 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 EN 1353, Determination of moisture content of autoclaved aerated concrete EN 1356:1996, Performance test for prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure under transverse load prEN 1520, Prefabricated components of lightweight aggregate concrete with open structure prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete Principle The shear strength between different layers of a multilayer component is determined by applying a horizontal compression force acting in the longitudinal direction of the component (or a section thereof, see 5.2) at one end face on the bottom layer, while the component is laid in a horizontal position on two roller supports near its ends The component is supported at the opposite end at the top layer to prevent horizontal displacement and uplift The shear strength is calculated from the resulting shear force acting in the plane of the component at fracture, divided by the measured length and width of component Apparatus a) a saw, capable of cutting test specimens from big reinforced components; © BSI 05-1999 b) length measuring devices (e.g calipers and/or rules), capable of measuring the dimensions of test specimens to an accuracy of mm; c) a support frame with rollers (diameter at least 40 mm) and adjustable supports according to Figure 1; d) a jack, capable of applying a compressive load without shock The precision of the jack and of the load indication shall be such that the failure load can be determined to an accuracy of ± % The measuring range shall be such that the failure load is higher than one-tenth of the upper limit of the range e) (if required) a load cell placed between the jack and the support frame, capable of recording the compressive force with the accuracy and within the range specified in d); f) (optional) a device for measurement of displacements between individual layers Test specimens 5.1 Sample The sample for the preparation of the test specimens shall be taken in such a manner that it is representative of the product to be investigated 5.2 Shape and size of test specimens The test specimen usually consists of a whole multilayer component or a section thereof Preferably, the length of the test specimen should be between (2 and 3) m and its width between (0,5 and 1,0) m Components with width over 1,0 m may be cut in longitudinal direction, components with length over m may be cut to a length of (2 to 3) m 5.3 Number of test specimens Three test specimens shall be tested, unless otherwise specified in a relevant European Standard 5.4 Preparation of test specimens If necessary, test specimens shall be cut from larger components by means of a saw 5.5 Measurement of test specimens The length of the test specimens shall be measured along the centre lines on the surfaces of both outer layers The width (not including the width of any tongue) shall be measured over the whole thickness of the test specimen at a distance of 100 mm from both ends In addition, the thicknesses of the individual layers shall be measured, mainly to ascertain that there are no significant deviations from the nominal values Significant deviations shall be noted in the test report EN 1742:1998 Figure — Typical test set-up 5.6 Conditioning of test specimens Testing procedure The components shall be allowed to have the minimum curing time prescribed by the manufacturer At the time of testing, the mass related moisture content of the outer layers shall be between (10 and 40) % for AAC and at least % for LAC This shall be checked after the shear test on test specimens taken from the central parts of the outer layers The determination of the moisture content shall be performed according to EN 1353 in the case of AAC and according to clause of EN 1356:1996 in the case of LAC The temperature of the test specimens shall be in equilibrium with that of the test premises, but shall never be below °C at the time of test The test specimens shall be placed in the support frame on two rollers and positioned in such a way that the entire end face of the top layer is in contact with the horizontal support Between the horizontal support and the end face of the top layer an intermediate layer of soft fibre board with a width equal to the thickness of the top layer shall be inserted The support frame shall be provided with a device capable of preventing uplift of the end of the test specimen during application of the test load Support conditions are shown in Figure The load shall be applied to the end face of the bottom layer at the opposite end of the test specimen It shall be carefully centred in relation to the longitudinal axis of the test specimen and the centre plane of the bottom layer and shall be evenly distributed over the full width of the test specimen by means of a sufficiently rigid steel section and an intermediate layer of soft fibre board with a width equal to the thickness of the bottom layer The load may be applied continuously or in steps The loading rate shall be such that the failure load is reached after about © BSI 05-1999 EN 1742:1998 If required, the displacement between the individual layers should be measured at the ends of the test specimen as a function of the applied load After the shear test the moisture content of the bottom layer and the top layer shall be determined as specified in 5.6 Test results The shear strength between the different layers shall be calculated using equation (1): 4F Ù = -( b + b ) × ( l1 + l ) (1) where Ù is the in plane shear strength, in newtons per square millimetre; F is the failure load, in newtons; b1, b2, l1, l2 are the values for the width and the length of the test specimen determined in accordance with 5.5, in millimetres The shear strength of the individual test specimens and the mean value shall be expressed to the nearest 0,01 N/mm2 © BSI 05-1999 Test report The test report shall include the following: a) identification of the components; b) date of manufacture or other code; c) place and date of testing, testing institute and person responsible for testing; d) number and date of issue of this European Standard; e) description of components with indication of sizes and interesting material properties of individual layers; f) measured dimensions of individual test specimens; g) description of preparation of test specimens; h) type and place of failure; j) shear strength of each individual test specimen and mean value; k) (if measured) displacement between individual layers as a function of the applied load or of the calculated shear stress (table or graph); l) moisture content of the outer layers; m) observations during the test; n) (if appropriate) deviations from the standard method of testing; o) a declaration that the testing has been carried out in accordance with this European Standard except as detailed in n) BS EN 1742:1998 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British 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