1、BRITISH STANDARD BS EN 991:1996 Determination of the dimensions of prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure The European Standard EN 991:1995 has the status of a British Standard ICS 91.080.40;91.100.30BSEN991:1996
2、This British Standard, having been prepared under the directionof the Sector Board forBuilding and Civil Engineering, was published underthe authorityof the Standards Boardand comes intoeffect on 15March1996 BSI 12-1999 The following BSI references relate to the work on this standard: Committee refe
3、rence B/523 Draft for comment 93/100974 DC ISBN 0 580 25344 9 Committees responsible for this BritishStandard The preparation of this British Standard was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregate concrete wit
4、h open structure, upon which the following bodies were represented: Aggregate Concrete Block Association Autoclaved Aerated Concrete Products Association British Masonry Society British Precast Concrete Federation Ltd. Department of the Environment (Building Research Establishment) Institution of St
5、ructural Engineers Local Authority Organizations Amendments issued since publication Amd. No. Date CommentsBSEN991:1996 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 991 3 List of references Inside back coverBSEN991:1996 ii BSI 12-19
6、99 National foreword This British Standard has been prepared by Technical Committee B/523 and is the English language version of EN991:1995, Determination of the dimensions of prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structur
7、e, aggregate published by the European Committee for Standardization (CEN). 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 confe
8、r immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 990:1995 BS EN 990:1996 Test methods for verification of corrosion protection of reinforcement in autoclaved aerated concrete and lightweight aggregate concrete with open structure ISO 7976-
9、1:1989 BS 7307 Building tolerances Measurements of buildings and building products Part 1:1990 Methods and instruments Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has b
10、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 991 May 1995 ICS 91.080.40;91.100.30 Descriptors: Concrete, cellular concrete, aggregates, tests, di
11、mensional measurements, dimensions squaring English version Determination of the dimensions of prefabricated reinforcedcomponents made of autoclaved aerated concreteor lightweight aggregate concrete with open structure Dtermination des dimensions de composants prfabriqus arms en bton cellulaire auto
12、clav ou en bton de granulats lgers structure ouverte Bestimmung der Mae vorgefertigter bewehrter Bauteile aus dampfgehrtetem Porenbeton oder haufwerksporigem Leichtbeton This European Standard was approved by CEN on1995-04-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
13、 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
14、 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
15、 standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, 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 Normun
16、g Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 991:1995 EEN991:1995 BSI 12-1999 2 Foreword This European Standard has been prepared by the Technica
17、l Committee CEN/TC177, Prefabricated reinforced components of autoclaved aerated concrete or light-weight aggregate concrete with open structure, of which the secretariat is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical te
18、xt or endorsement, at the latest by November1995, and conflicting national standards shall be withdrawn at the latest by November1995. In order to meet the performance requirements as laid down in the product standard for prefabricated components of lightweight aggregate concrete with open structure
19、 a number of standardized test methods are necessary. According to the CEN/CENELEC 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, Portu
20、gal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Procedure 3 5.1 General 3 5.2 Measurement of length and width 3 5.3 Measurement of thickness 3 5.4 Measurement of the shape of profiled faces 3 5.5 Verifi
21、cation of squareness 3 5.6 Additional measurements for hollow core components made of lightweight aggregate concrete with open structure 5 5.7 Additional measurements for multilayer components 5 6 Test report 5 Figure 1 Position of measuring points for length and width measurements 4 Figure 2 Positi
22、on of measuring points for thickness measurements 4 Figure 3 Examination of squareness 5EN991:1995 BSI 12-1999 3 1 Scope This European Standard specifies a method of determining the essential dimensions and of verification of squareness of fabricated reinforced components made of autoclaved aerated
23、(AAC) 1)or lightweight aggregate concrete (LAC) with open structure according to prEN1520. 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
24、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 990,
25、 Test methods for verification of corrosion protection of reinforcement in autoclaved aerated concrete and lightweight aggregate concrete with open structure. prEN 1356, Performance test under transversal load for prefabricated reinforced components made of autoclaved aerated concrete or lightweight
26、 aggregate concrete with open structure. prEN 1520, Prefabricated components of lightweight aggregate concrete with open structure. ISO 7976-1, Tolerances for building Methods of measurement of buildings and building products Part1: Methods and instruments. 3 Principle The length, width, thickness a
27、nd, where required, other essential dimensions of the components are measured by means of a rule, a tape measure, calipers or another suitable measuring device. In addition, for nominally rectangular components the squareness is checked. 4 Apparatus a) Any measuring instrument for the determination
28、of linear dimensions which meets the requirements of ISO7976-1 and allows readings with an accuracy of1mm; b) Position pieces for defining edges of components with profiled faces or with a distinct surface texture, which meet the requirements of ISO7976-1; c) A square with sides of at least500mm len
29、gth. 5 Procedure 5.1 General In the case of components presenting profiled faces or surfaces with a considerable roughness in relation to the permitted dimensional deviations, the measurements shall be taken with the aid of suitable position pieces placed on the object of measurement. The number of
30、measuring points indicated in5.2 to5.7 is considered to be the minimum number required; additional measurements may therefore be taken to reflect any additional dimensional accuracy requirements. 5.2 Measurement of length and width On each face of the component, three length measurements L 1to L 3an
31、d three width measurements W 1to W 3shall be taken as shown inFigure 1. If the specified width does not exceed1,20m, measurement L 2may be omitted. If the specified length does not exceed1,20m, measurement W 2may be omitted. 5.3 Measurement of thickness Eight thickness measurements shall be taken as
32、 shown inFigure 2. Where the specified width does not exceed1,20m, measurements at points T 4and T 8may be omitted. Where the special length does not exceed1,20m, measurements at points T 2and T 8may be omitted. 5.4 Measurement of the shape of profiled faces Where required the main dimensions of ton
33、gue and groove profiles or otherwise profiled edges shall be measured at least at three measuring points along each profiled edge, e.g.in the neighbourhood of the measuring points indicated inFigure 2. 5.5 Verification of squareness The squareness of nominally rectangular components in their plane s
34、hall be checked at both ends by means of a square as shown inFigure 3. 1) A standard about “prefabricated reinforced elements of autoclaved aerated concrete” is in preparation at CENEN991:1995 4 BSI 12-1999 Figure 1 Position of measuring points for length and width measurements Figure 2 Position of
35、measuring points for thickness measurementsEN991:1995 BSI 12-1999 5 The deviation of squareness is defined as the distance, expressed in millimetres, between the square at a distance of500mm from the apex and the connecting line of the two corners adjacent to the end face under consideration. 5.6 Ad
36、ditional measurements for hollow core components made of lightweight aggregate concrete with open structure At both ends of hollow core components the following dimensions shall be measured. Thickness of the concrete above and below each cavity (dimensions d 1and d 2according to Figure2 of prEN1520)
37、. Minimum width of the section after subtracting the width of the cavities and the depth of grooves. 5.7 Additional measurements for multilayer components The thickness of the individual layers shall be measured at least at three measuring points distributed over the width in a section near midspan.
38、 These measurements may be performed on components previously tested in a load test according to prEN1356 or on sections used for the corrosion test according to EN990. 6 Test report The test report shall include the following: a) identification of the product; b) date of manufacture or other code;
39、c) date of sampling; d) place and date of testing, testing institute and person responsible for testing; e) number and date of edition of this European Standard; f) mean values of measured dimensions rounded to the nearest1mm, for each individual component; g) in the case of nominally rectangular co
40、mponents: deviation from squareness rounded to the nearest mm at both opposite end faces; h) observations on the appearance of the components effecting the measurements. Figure 3 Examination of squareness6 blankBSEN991:1996 BSI 12-1999 List of references See national foreword.BS EN 991:1996 BSI 389
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