1、BRITISH STANDARD BS EN 678:1994 Determination of the dry density of autoclaved aerated concrete The European Standard EN678:1993 has the status of a BritishStandard UDC 666.973.6.035.55:620.1:531.75BSEN678:1994 This BritishStandard, having been prepared under the directionof Technical CommitteeB/523
2、, was publishedunder the authorityofthe Standards Boardand comes into effect on 15 March1994 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference B/523 Draft for comment92/12454DC ISBN 0 580 22331 0 Cooperating organizations The European Committee for Stan
3、dardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimislii
4、to, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspec
5、tion du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisati
6、on UnitedKingdom BritishStandards Institution Amendments issued since publication Amd. No. Date CommentsBSEN678:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN678 3 National annex NA (informative) Committees responsible Inside
7、back cover National annex NB (informative) Cross-reference Inside back coverBSEN678:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggreg
8、ate concrete with open structure. It is the Englishlanguage version of EN678:1993 Determination of dry density of autoclaved aerated concrete published by the European Committee for Standardization(CEN). A British Standard does not purport to include all the necessary provisions of a contract. Users
9、 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, pagesi andii, theEN title page, pages2 to4, an inside back
10、 cover 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN678 December1993 UDC 666.973.6.035.55:620.1:531.75 Descri
11、ptors: Concrete, aerated concrete, tests, measurements, density, dry density English version Determination of the dry density of autoclaved aerated concrete Dtermination de la masse volumique sche du bton cellulaire autoclav Bestimmung der Trockenrohdichte von dampfgehrtetem Porenbeton This European
12、 Standard was approved by CEN on1993-12-07. 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
13、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 langua
14、ge and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
15、itedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN678:1993 EEN678:1993 2 BSI 01-2000 Foreword This European Standard has been
16、 prepared by CEN/TC177, Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure. 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 Ju
17、ne1994, and conflicting national standards shall be withdrawn at the latest by June1994. The standard was approved and in accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany,
18、Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. 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
19、specimens 3 5.4 Preparation of test specimens 3 6 Testing procedure 4 6.1 Determination of the volume of the test specimens 4 6.2 Determination of the dry mass of the test specimens 4 7 Test results 4 8 Test report 4 Figure 1 Sampling scheme 4EN678:1993 BSI 01-2000 3 1 Scope This European Standard s
20、pecifies the procedure for the determination of the dry density of autoclaved aerated concrete. 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, an
21、d 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. E
22、N679, Determination of compressive strength of autoclaved aerated concrete. 3 Principle Test specimens are taken from prefabricated components. The dry density is determined as the ratio between the mass of the test specimens after drying to constant mass at(105 5) C and their volume. 4 Apparatus a)
23、 a saw, (for cylindrical test specimens also a core drill) for cutting test specimens; b) a straightedge, at least200mm long, and a0,1mm-feeler gauge; c) calipers, capable of reading the dimensions of the test specimens to an accuracy of0,1mm; d) a ventilated drying oven, capable of maintaining a te
24、mperature of(105 5) C; e) a balance, capable of determining the mass of the test specimens to an accuracy of0,1%. 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. NOTEThe test
25、 specimens may be prepared from prefabricated reinforced components. Alternatively, they may be taken from prefabricated unreinforced components of the same mould. 5.2 Shape and size of test specimens The test specimens shall be prisms, cubes, or cylinders with a minimum dimension of at least50mm an
26、d a volume of at least0,5 10 3 m 3each. It is recommended that the dry density be determined on the test specimens used for the determination of the compressive strength according to EN679. 5.3 Number of test specimens A test set shall consist of three test specimens. Whenever possible, one test spe
27、cimen shall be prepared from the upper third of the component, one from the middle and one from the lower third, in the direction of rise of the mass during manufacture (seeFigure 1). The position of the test specimens in the material, relative to the rise of the mass, shall be shown by the numberin
28、g. Alternatively, one single test specimen is sufficient, if it extends over the full height of the rise of the mass and if its volume is at least1,5 10 3 m 3 . The dry density determined on such a test specimen is equivalent to the mean value of three individual test specimens. 5.4 Preparation of t
29、est specimens The test specimens shall be cut by means of a saw (or a core drill in the case of cylindrical test specimens). Plane surfaces shall not deviate from planeness by more than0,1mm. Planeness shall be checked across the two diagonals of each surface, using a straightedge and a0,1mm-feeler
30、gauge. Deviations shall be corrected by means of grinding, milling, or a similar process. NOTEPreferably, the test specimens should not contain any reinforcement. If the inclusion of reinforcement cannot be avoided, the mass and the volume of the reinforcement including anticorrosion coating shall b
31、e considered in the calculation of the dry density.EN678:1993 4 BSI 01-2000 6 Testing procedure 6.1 Determination of the volume of the test specimens The volume of the individual test specimens is calculated from their dimensions. For this purpose, the dimensions shall be measured at different place
32、s to an accuracy of0,1mm by means of calipers. The necessary number of individual measurements from which the mean dimensions are calculated depends on the shape, size, and regularity of the surfaces and shall enable determination of the volume V of the test specimen with an error not exceeding1%. 6
33、.2 Determination of the dry mass of the test specimens The test specimens are placed in a ventilated drying oven at(105 5) C until constant mass is attained. Immediately after removal from the drying oven, the dry mass, m d , of the individual test specimens shall be determined. The error in determi
34、ning the mass shall not exceed0,1% of the mass of the test specimen. The mass of the test specimen is considered constant if after24h of further drying it has not changed by more than0,2%. 7 Test results The dry density i , in kilograms per cubic metre, of each individual test specimen i is calculat
35、ed as follows: i = i=1,2,3 The dry density of each individual test specimen, i , shall be expressed to the nearest5kg/m 3 . The dry density of the product, , in kilograms per cubic metre, is defined as the mean value of the dry densities iof the three test specimens of the test set: = ( 1 + 2 + 3 )
36、The dry density of the product, , shall be expressed to the nearest5kg/m 3 . 8 Test report The test report shall include the following: a) identification of the product; b) date of manufacture or other code; c) place and date of testing, testing institute and person responsible for testing; d) numbe
37、r and date of issue of this European Standard; e) shape, size, and relative position of the test specimens; f) dry density of each individual test specimen and mean value; g) observations on the appearance of the test specimens. Figure 1 Sampling scheme where: m di is the dry mass of the test specim
38、en, determined according to6.2, in kilograms; m di V i - V i is the volume of the test specimen, determined according to6.1, in cubic metres. 1 3 -BSEN678:1994 BSI 01-2000 National annex NA (informative) Committees responsible The UnitedKingdom participation in the preparation of this European Stand
39、ard was entrusted to Technical Committee B/523 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 Est
40、ablishment) Federation of Civil Engineering Contractors Local Authority Organizations National annex NB (informative) Cross-reference Publication referred to Corresponding BritishStandard EN679:1993 BS EN679:1994 Determination of compressive strength of autoclaved aerated concreteBS EN 678:1994 BSI
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