1、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 with open structure The European Standard EN1742:1998 has the status of a British Standard ICS 91.100.30BSEN1742:19
2、98 This British Standard, having been prepared under the directionof the Sector Board for Building and Civil Engineering, was published under the authorityof the Standards Boardand comes intoeffecton 15November 1998 BSI 05-1999 ISBN 0 580 30147 8 National foreword This British Standard is the Englis
3、h language version of EN1742:1998. The UK participation in its preparation was entrusted to Technical CommitteeB/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregated concrete with open structure, which has the responsibility to: aid enquirers to understa
4、nd 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 ca
5、n 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
6、 “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
7、legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 5 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 tab
8、le on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN1742:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 1742 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1742 April 1998 ICS Descriptors: Concrete, c
9、ellular 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 lightweigh
10、t aggregate concrete with open structure Dtermination de la rsistance au cisaillement entre des diffrentes couches dlments multicouches raliss en bton cellulaire autoclav ou en bton de granulats lgers strucuture ouvert Bestimmung der Scherfestigkeit zwischen den verschiedenen Schichten mehrschichtig
11、er Bauteile aus dampfgehrtetem 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
12、 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 ot
13、her 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, CzechRepublic, Denmark, Finland, France, Germany, G
14、reece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rig
15、hts of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. 1742:1998 EEN1742:1998 BSI 05-1999 2 Foreword This European Standard has been prepared by Technical Committee CEN/TC177, Prefabricated reinforced components of autoclaved aerated concrete or lightw
16、eight 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 o
17、f 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. Accord
18、ing to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
19、Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test specimens 3 5.1 Sample 3 5.2 Shape and size of test specimens 3 5.3 Number of test specimens 3 5.4 Preparation of test specimens 3 5.5 Measurement of test spe
20、cimens 3 5.6 Conditioning of test specimens 4 6 Testing procedure 4 7 Test results 5 8 Test report 5 Figure 1 Typical test set-up 4EN1742:1998 BSI 05-1999 3 1 Scope This European Standard specifies a method of determining the shear strength under short-term loading between the different layers of pr
21、efabricated multilayer components made of autoclaved aerated concrete (AAC) according to prEN12602 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. 2
22、 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 revisi
23、ons 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, Performan
24、ce 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
25、of autoclaved aerated concrete. 3 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, see5.2) at one end face on the bottom layer, while t
26、he 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 f
27、racture, divided by the measured length and width of component. 4 Apparatus a) a saw, capable of cutting test specimens from big reinforced components; b) length measuring devices (e.g.calipers and/or rules), capable of measuring the dimensions of test specimens to an accuracy of 1 mm; c) a support
28、frame with rollers (diameter at least40mm) and adjustable supports according toFigure 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 3%. The measuring ran
29、ge 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 ind); f) (optional) a device for me
30、asurement of displacements between individual layers. 5 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
31、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 (0,5and1,0)m. Components with width over1,0m may be cut in longitudinal direction, components with length over3m may be cut to a length of (2to3)m. 5.3
32、 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 s
33、pecimens 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 of100mm from both ends. In addition, the thicknesses of the individual layers shall
34、be measured, mainly to ascertain that there are no significant deviations from the nominal values. Significant deviations shall be noted in the test report.EN1742:1998 4 BSI 05-1999 5.6 Conditioning of test specimens The components shall be allowed to have the minimum curing time prescribed by the m
35、anufacturer. At the time of testing, the mass related moisture content of the outer layers shall be between (10and40)% for AAC and at least5% 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 cont
36、ent shall be performed according to EN1353 in the case of AAC and according to clause7 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 0C at the time of test. 6 Testing procedure The test speci
37、mens 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
38、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 inFigure 1. The load shall be applied to the end face of the bottom layer
39、 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 i
40、ntermediate 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 about3min. Figure 1 Typical test set-upEN1742:1998 BSI 05-1999 5 If required, the dis
41、placement 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 in5.6. 7 Test results The shear strength between the differe
42、nt layers shall be calculated using equation (1): where The shear strength of the individual test specimens and the mean value shall be expressed to the nearest 0,01N/mm 2 . 8 Test report The test report shall include the following: a) identification of the components; b) date of manufacture or othe
43、r 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
44、 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);
45、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 8 n). (1) is the in plane shear strengt
46、h, in newtons per square millimetre; F is the failure load, in newtons; b 1 , b 2 , l 1 , l 2are the values for the width and the length of the test specimen determined in accordance with5.5, in millimetres. 4F b 1b 2 + () l 1l 2 + () - =BS EN 1742:1998 BSI 389 Chiswick High Road London W4 4AL BSIBr
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