1、BRITISH STANDARD BS EN 992:1996 Determination of the dry density of lightweight aggregate concrete with open structure The European Standard EN992:1995 has the status of a British Standard ICS 91.080.40; 91.100.30BSEN992:1996 This British Standard, having been prepared under the directionof the Sect
2、or Board forBuilding and Civil Engineering, was published underthe authority of the Standards Board and comes into effect on 15 February1996 BSI08-1999 The following BSI references relate to the work on this standard: Committee referenceB/523 Draft for comment93/100973DC ISBN 0 580 25352 X Committee
3、s responsible for this British Standard The preparation of this British Standard was entrusted to Technical CommitteeB/523, Prefabricated concrete and lightweight aggregate concrete with open structure, upon which the following bodies were represented: Aggregate Concrete Block Association Autoclaved
4、 Aerated Concrete Products Association British Masonry Society British Precast Concrete Federation Ltd. Department of the Environment (Building Research Establishment) Institution of Structural Engineers Local Authority Organizations Amendments issued since publication Amd. No. Date CommentsBSEN992:
5、1996 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN992 3BSEN992:1996 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical CommitteeB/523. It is the English language version of EN992:1995 Determination
6、of the dry density of lightweight aggregate concrete with open structure 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.
7、 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 and a back cover. This standard has been updated (see copyright date) and may have
8、had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN992 May1995 ICS 91.080.40; 91.100.30 Descriptors: Concrete, aggregates, tests,determination, density (mass volume) English version Determination of
9、 the dry density of lightweight aggregate concrete with open structure Dtermination de la masse volumique sche dun bton de granulats lgers structure ouverte Bestimmung der Trockenrohdichte von haufwerksporigem Leichtbeton This European Standard was approved by CEN on1995-04-14. CEN members are bound
10、 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 Cen
11、tral 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
12、 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 UnitedKingdom. CEN European Committee for Standardization Comit Eur
13、open de Normalisation Europisches Komitee fr Normung 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. EN992:1995 EEN992:1995 BSI 08-1999 2 Foreword This E
14、uropean Standard has been prepared by the Technical 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. In order to meet the performance requirements as laid down in t
15、he product standard for prefabricated components 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 la
16、test by November1995, and conflicting national standards shall be withdrawn at the latest by November1995. 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, I
17、reland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom. 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
18、 Preparation of the test specimens 3 6 Procedure 3 6.1 Determination of the volume 3 6.2 Determination of the dry mass 4 7 Calculation of the dry density and expression of test results 4 8 Test report 4EN992:1995 BSI 08-1999 3 1 Scope This European Standard specifies a method of determining the dry
19、density of lightweight aggregate concrete with open structure (LAC). 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 liste
20、d 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. prEN1520, Prefabricated compo
21、nents of lightweight aggregate concrete with open structure. 3 Principle The dry density is determined on test specimens taken from prefabricated components according to prEN1520 as the ratio between mass of the concrete after drying to constant mass and its volume. 4 Apparatus a) a straight edge an
22、d feeler gauges; b) callipers, allowing readings with an accuracy of0,1mm; c) a ventilated drying oven, maintainable at a temperature of(105 5) C; d) a balance allowing the determination of the mass of the specimens with an accuracy of0,1%; e) equipment for drilling cores with water cooled diamond b
23、it and sufficiently rigid so that the cores can be obtained with straight sides and a minimum of surface irregularities; f) a saw with water cooled rotating carborundum or diamond blade for cutting test specimens or cutting test specimens to length. 5 Test specimens 5.1 Sample The sample for the pre
24、paration of the test specimens shall be taken in such a manner that it is representative of the product to be investigated. NOTEThe test specimens may be prepared from prefabricated reinforced components. Alternatively, they may be taken from prefabricated unreinforced components of the same mould.
25、5.2 Shape and size of test specimens The test specimens shall be cores with a diameter of approximately100mm. The cores shall be drilled perpendicular to the plane of floor slabs, roof slabs, and wall slabs and in vertical direction in the case of lintels. The cores shall extend over the whole thick
26、ness (height) of the component. Alternatively, test specimens may be prisms or cubes with a minimum dimension of at least50mm and a volume of at least0,5 10 3 m 3 . As for the rest, the same requirements apply as for cores. In the case of hollow core components the top layer and the bottom layer sha
27、ll be cut from the test specimens, and only this material shall be tested. In the case of multilayer components the individual layers shall be separated by cutting the test specimens perpendicular to their axis, and the dry density of the different layers shall be determined separately (see note). N
28、OTEIn the case of top and bottom layers thinner than20mm, this method gives only a rough approximation for the density. 5.3 Number of test specimens A test set shall consist of at least3 test specimens with a combined volume of at least2 10 3 m 3for solid components and0,75 10 3 m 3for the individua
29、l layers of multilayer or hollow core components. 5.4 Preparation of the test specimens The test specimens shall not be taken before the concrete has sufficiently hardened to ensure that a regular surface of the specimens can be obtained. They are preferably taken at points not near to joints or edg
30、es of the components, and with no or little reinforcement. If the inclusion of reinforcement cannot be avoided, the mass and the volume of the bars shall be considered in the calculation of the dry density of the LAC. The deviations of the surfaces of the test specimens from regular shape shall be s
31、mall enough to enable the determination of the volume from the measured dimensions with an error not exceeding1%. 6 Procedure 6.1 Determination of the volume The dimensions from which the volume of the test specimens is calculated shall be measured with callipers to the nearest0,1mm.EN992:1995 4 BSI
32、 08-1999 6.2 Determination of the dry mass The test specimens are placed in a drying oven at(105 5) C until constant mass is attained. Normally, drying shall be started not before an age of7days. The mass of the individual test specimens shall be determined immediately after removal from the drying
33、oven. The error in determining 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 Calculation of dry density and expression of test results The dry density is calcul
34、ated as follows The volume of the reinforcement may be determined by dividing its mass by its density (in the case of steel reinforcement7,85 10 3 kg/m 3 ). The dry density of each individual test specimen shall be expressed to the nearest5kg/m 3 , and the mean value shall be rounded to the nearest1
35、0kg/m 3 . In the case of multilayer components the mean dry density of the individual layers shall be determined separately. 8 Test report The test report shall include the following: a) identification of the product; b) date of manufacture or other code; c) date of sampling; d) place and date of te
36、sting, testing institute and person responsible for testing; e) number and date of edition of this European Standard; f) shape and size of the test specimens; g) dry density of each individual test specimen and mean value (in the case of multilayer components for each layer of interest); h) observat
37、ions on the appearance of the test specimens, e.g.included reinforcement, irregularities of the structure. where is the dry density, in kilograms per cubic metres; m c is the mass of the dried test specimen minus the mass of the reinforcement, in kilograms; V c is the volume of the test specimen min
38、us the volume of the reinforcement, in cubic metres.blankBS EN 992:1996 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international lev
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