Bsi bs en 01742 1998 (1999)

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 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 EN 1742:1998 has the status of a

British Standard

ICS 91.100.30

BS EN 1742:1998

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 0 580 30147 8

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 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 table on the inside front cover

Amendments issued since publication

Amd No Date Comments

BS EN 1742:1998

Contents

Page

ii blank

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 1742

April 1998

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 à

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

© BSI 05-1999

2

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

Page

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 specimens 3 5.6 Conditioning of test specimens 4

Figure 1 — Typical test set-up 4

EN 1742:1998

1 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

2 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

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, 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

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 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 ± 3 % 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.

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 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 3 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

5.6 Conditioning of test specimens

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 5 % 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 7 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 0 °C at the time of test

6 Testing procedure

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 1

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 3 min

Figure 1 — Typical test set-up

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.

7 Test results

The shear strength between the different 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 0,01 N/mm2

8 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 8 n).

(1)

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.

Ù 4F

b1+ b2

-=

BS EN

1742:1998

BSI

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