1、CEN EN*992 95 3404589 OLL9915 700 BRITISH STANDARD Determination of the dry density of lightweight aggregate concrete with open structure The European Standard EN 992 : 1995 has the status of a British Standard ICs 91.080.40; 91.100.30 NO COPYING WTHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH
2、T LAW BS EN 992 : 1996 CEN ENx992 95 m 3404589 OLL99Lb 647 m BS EN 992 : 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/523, Prefabricated concrete and lightweight aggregate concrete with open structure, upon whic
3、h 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 Structural Engineers Local Au
4、thority Organizations 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 February 1996 O BSI 1996 The following BSI references relate to the work
5、on this standard: Committee reference B1523 Dmft for comment 93/100973 M: ISBN O 580 25362 X Amendments issued since publication Amd* No* I Date I Text affected CEN ENt992 95 3404589 OLL99L7 583 BS EN 992 : 1996 Contents Commit tees responsible Page Inside front cover National foreword ii Foreword 2
6、 %xt of EN 992 3 O BSI 1906 i CEN EN+2 95 3404589 OLL99L8 4LT = BSEN992: 1996 National foreword This British Standard has been prepared by Qchnical Committee B/523. It is the English language version of EN 992 : 1995 Determination of the dry o!ensity of lightweight aggregate concrete with open struc
7、ture published by the European Committee for Standardization (CEN). Compliance with a British Standard does not of itself confer immunity from legal obligations. 11 O ES1 1996 CEN EN*992 95 m 3404589 Oll99l9 356 H EUROPEAN STANDARD EN 992 NORME EUROPENNE EUROPISCHE NORM May 1995 ICs 91.080.40; 91.10
8、0.30 Descriptors: Concrete, aggregates, tests, determination, density (mass volume) English version Determination of 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 Trockenrohdi
9、chte von haufwerksporigem Leichtbeton This European Standard was approved by CEN on 1995-04-14. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-d
10、ate 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 th
11、e 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
12、 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 O 1995 All rights of reproduction and communication in any form and by a
13、ny means reserved in all countries to CEN and its members. Ref. No. EN 992 : 1995 E CEN EN*992 95 m 3404589 OLL9920 078 m Page 2 EN 992: 1995 Foreword This European Standard has been prepared by the Technical Committee CEN/TC 177, Prefabricated reinforced components of autoclaved aerated concrete or
14、 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 the product standard for prefabricated components of lightweight aggregate concrete with open structure a number of standardized test methods a
15、re 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 November 1995, and conflicting national standards shall be withdrawn at the latest by November 1995. According to the CENKENELEC Inter
16、nal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword 1 Scope 2 Norm
17、ative references 3 Principle 4 Apparatus 5 Test specimens 5.1 Sample 5.2 Shape and size of test specimens 5.3 Number of test specimens 5.4 Preparation of the test specimens 6 Procedure 6.1 Determination of the volume 6.2 Determination of the dry mass 7 Calculation of the dry density and expression o
18、f test results 8 %st report Page 2 3 3 3 3 3 3 3 3 3 3 3 4 4 4 0 BSI 1996 CEN ENS772 95 = 3404587 OL11772L TO4 Page 3 EN 992: 1995 1 Scope This European Standard specifies a method of determining the dry density of lightweight aggregate concrete with open structure (LAC). 2 Normative references This
19、 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 publica
20、tions 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. prEN 1520 Prefabricated cornpomts of lightweight aggregate concrete with open structure 3 Principle The dry density is determ
21、ined on test specimens taken from prefabricated components according to prEN 1520 as the ratio between mass of the concrete after drying to constant mass and its volume. 4 Apparatus a) a straight edge and feeler gauges; b) callipers, allowing readings with an accuracy of 0,l mm; c) a ventilated dryi
22、ng oven, maintainable at a temperature of (105 f 5) OC; d) a balance allowing the determination of the mass of the specimens with an accuracy of 0,l %; e) equipment for drilling cores with water cooled diamond bit and sufficiently rigid so that the cores can be obtained with straight sides and a min
23、imum 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 preparation of the test specimens shall be taken in such a manner that it is representative
24、of the product to be investigated. NOTE. The test 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 cores with a diameter
25、of approximately 100 mm. 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 thickness (height) of the component. Alternatively, test specimens may be prisms or cubes
26、with a minimum dimension of at least 50 mm and a volume of at least 0,5 x m3. 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 shall be cut from the test specimens, and only this material shall be tested. In the case
27、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). NOTE. In the case of top and bottom layers thinner than 20 mm, this method gives only a
28、rough approximation for the density. 5.3 Number of test specimens A test set shall consist of at least 3 test specimens with a combined volume of at least 2 x m3 for solid components and 0,75 x m3 for the individual layers of multilayer or hollow core components. 5.4 Preparation of the test specimen
29、s 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 edges of the components, and with no or little reinforcement. If the inclusion of reinfor
30、cement 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 small enough to enable the determination of the volume from the measured dimensions wit
31、h an error not exceeding 1 %. 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 nearest 0,l mm. O BSI 1996 CEN EN*992 95 3404589 OLL9922 940 Page 4 EN 992 : 1995 6.2 Determination of the dry ma
32、ss The test specimens are placed in a drying oven at (105 f 5) OC until constant mass is attained. Normally, drying shall be started not before an age of 7 days. The mass of the individual test specimens shall be determined immediately after removal from the drying oven. The error in determining the
33、 mass shall not exceed O, 1 % of the mass of the test specimen. The mass of the test specimen is considered constant if after 24 h of further drying it has not changed by more than 0,2 %. 7 Calculation of dry density and expression of test results The dry density is calculated as follows where p = m
34、clVc p m, is the dry density, in kilograms per cubic metres; is the mass of the dried test specimen minus the mass of the reinforcement, in kilograms; is the volume of the test specimen minus the volume of the reinforcement, in cubic metres. V, The volume of the reinforcement may be determined by di
35、viding its mass by its density (in the case of steel reinforcement 7,85 x lo3 kg/m3). The dry density of each individual test specimen shali be expressed to the nearest 5 kg/m3, and the mean value shall be rounded to the nearest 10 kg/m3. in the case of multilayer components the mean dry density of
36、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 testing, testing institute and person responsible for testing; e) number
37、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) observations on the appearance of the test specimens, e.g. included reinforceme
38、nt, irregularities of the structure. O BSI 1996 CEN ENa992 95 3404589 0339923 887 BS EN 992 : 1996 BSI 389 Chiswick High Road London W4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Eu
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