BS EN 1352-1997 Determination of static modulus of elasticity under compression of autoclaved aerated concrete or lightweight aggregate concrete with open structure《蒸气加气混凝土或开式结构轻集料.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1352 : 1997 The Eur

2、opean Standard EN 1352 : 1996 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Determination of static modulus of elasticity under compression of autoclaved aerated concrete or lightweight aggregate concrete with open structure

3、BS EN 1352 : 1997 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 October 1997 BSI 1997 The following BSI references relate to the work on this

4、 standard: Committee reference B/523 Draft for comment 93/110410 DC ISBN 0 580 27467 5 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/523, Prefabricated c

5、oncrete and lightweight aggregate concrete with open structure, upon which the following bodies were represented: Aggregate Concrete Block Association Autoclaved Aerated Concrete Association British Masonry Society British Precast Concrete Federation Ltd. Department of the Environment (Building Rese

6、arch Establishment) Institution of Structural Engineers Local Authority OrganizationsBS EN 1352 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 1352 3ii BSI 1997 BS EN 1352 : 1997 National foreword This British Standard has been pr

7、epared by Technical Committee B/523 and is the English language version of EN 1352 : 1996 Determination of static modulus of elasticity under compression of autoclaved aerated concrete or lightweight aggregate concrete with open structure, published by the European Committee for Standardization (CEN

8、). Cross-references Publication referred to Corresponding British Standard EN 678 : 1993 BS EN 678 : 1994 Determination of the dry density of autoclaved aerated concrete EN 679 : 1993 BS EN 679 : 1994 Determination of compressive strength of autoclaved aerated concrete EN 992 : 1995 BS EN 992 : 1996

9、 Determination of dry density of lightweight aggregate concrete with open structure EN 1354 : 1996 BS EN 1354 : 1997 Determination of compressive strength of lightweight aggregate concrete with open structure Compliance with a British Standard does not of itself confer immunity from legal obligation

10、s. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat

11、: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 1352 : 1996 E EUROPEAN STANDARD EN 1352 NORME EUROPE ENNE EUROPA ISCHE NORM December 1996 ICS 91.100.30 Descriptors: Concrete, cellular concrete, aggregates, mechanical tests, compression tests, determination, m

12、odulus of elasticity English version Determination of static modulus of elasticity under compression of autoclaved aerated concrete or lightweight aggregate concrete with open structure De termination du module de lasticite statique en compression du be ton cellulaire autoclave et du be ton de granu

13、lats le gers a structure ouverte Bestimmung des statischen Elastizita tsmoduls unter Druckbeanspruchung von dampfgeha rtetem Porenbeton und von haufwerksporigem Leichtbeton This European Standard was approved by CEN on 1996-11-30. CEN members are bound to comply with the CEN/CENELEC Internal Regulat

14、ions 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 Euro

15、pean Standard exists in three official version (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 natio

16、nal standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1352 : 1996 BSI 1997 Foreword This European Standard has been prepared by Technical Committ

17、ee 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. This European Standard shall be given the status of a national standard, either by publication of an identical text or by

18、endorsement, at the latest by June 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. 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 conc

19、rete with open structure, a number of standardized test methods are necessary. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece

20、, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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 Test specimens 3 5.1 Sample 3 5.2 Shape and size of test specimens 3 5.3 Number of test s

21、pecimens 4 5.4 Preparation of test specimens 4 5.5 Measurement of test specimens 4 5.6 Conditioning of test specimens 5 6 Determination of static modulus of elasticity 5 6.1 Position of gauge points and gauge length 5 6.2 Testing procedure 5 7 Test results 6 8 Test report 7Page 3 EN 1352 : 1996 BSI

22、1997 1) A European Standard for prefabricated reinforced components of autoclaved aerated concrete, is in preparation at CEN. 1 Scope This European Standard specifies a method of determining the static modulus of elasticity in compression of autoclaved aerated concrete (AAC) 1) or lightweight aggreg

23、ate concrete with open structure (LAC) according to prEN 1520. 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 her

24、eafter. 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 678 Determination of dry densit

25、y of autoclaved aerated concrete EN 679 Determination of compressive strength of autoclaved aerated concrete EN 992 Determination of dry density of lightweight aggregate concrete with open structure EN 1354 Determination of compressive strength of lightweight aggregate concrete with open structure p

26、rEN 1520 Prefabricated components of lightweight aggregate concrete with open structure ISO 4012 : 1978 Testing concrete Determination of compressive strength of test specimens 3 Principle The modulus of elasticity (E-modulus) is determined on prismatic test specimens taken from prefabricated compon

27、ents. It is calculated from the difference of longitudinal compressive strains corresponding to the increase of longitudinal compressive stress from the basic test stress s a (approximately 5 % of the declared compressive strength of the concrete) to the upper test stress s b (in general one-third o

28、f the declared compressive strength of the concrete). 4 Apparatus a) Any saw, suitable for cutting reinforced AAC or LAC components; b) Callipers, capable of reading the dimensions of the test specimens to an accuracy of 0,1 mm; c) A straight-edge (at least as long as the longest diagonal of the tes

29、t specimen surfaces, in the case of cylinders: at least as long as the generatrix), feeler gauges (0,2 mm, 0,5 mm (only for LAC), and 1,0 mm for both) and a square; d) A balance, capable of determining the mass of the test specimens to an accuracy of 0,1 %; e) A compression testing machine, which me

30、ets the requirements of ISO 4012 : 1978. It shall be capable of applying the required load at the specified rate and maintaining it at the required level for at least 60 s; f) Equalizing layers of soft fibreboard, with a thickness of (12 2) mm and a density of (250 to 400) kg/m 3 to be inserted betw

31、een the loadbearing surfaces of the test specimens and the platens of the compression testing machine (not required in the case of levelling the loadbearing surfaces by grinding or capping); g) A ventilated drying oven, capable of maintaining a temperature of (105 5)C (see note); h) Gauges, for dete

32、rmining the longitudinal deformations or strains with a gauge length according to 6.1, suitable to determine the strains to an accuracy of 53 10 26 (e.g. inductive displacement transducers, dial gauges, mirror extensometers, strain gauges etc.). NOTE. In addition, a ventilated drying oven capable of

33、 maintaining a temperature of (40 to 60) C can be helpful for conditioning of test specimens. 5 Test specimens 5.1 Sample The sample (normally at least one prefabricated component) for the preparation of the test specimens shall be taken in such a manner that it is representative of the product to b

34、e investigated. Test specimens may be prepared from samples which have previously been used for other tests, provided that they are cut at least 150 mm from an area where visible damage or changes of normal structure and appearance have occurred. 5.2 Shape and size of test specimens The reference te

35、st specimens shall be prisms with square cross-section with the dimensions normally 100 mm3 100 mm3 300 mm. Prisms of other sizes or other shape of the cross-section or cylindrical test specimens (drilled cores) may be used, provided that the smallest cross-sectional dimension is at least 75 mm (but

36、 not less than four times the maximum size of the aggregate in the concrete) and the ratio between length L and the smallest cross-sectional dimension D is in the range of 2# L/D# 4. If these requirements are not fulfilled, e.g. in the case of test specimens taken from hollow core components, this s

37、hall be stated in the test report.Page 4 EN 1352 : 1996 BSI 1997 Direction of rise Zone 1 Zone 2 Zone 3 W/3 W/3 W/3 Width W Thickness Figure 1. Sampling scheme for AAC-test specimens 5.3 Number of test specimens A test set shall consist of at least three test specimens. In the case of AAC, whenever

38、possible, one test specimen 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 (see figure 1). The position of the test specimens in the material relative to the rise of the mass shall be

39、shown by the numbering, and the direction of rise shall be marked on the test specimens. 5.4 Preparation of test specimens The specimens shall be cut not less than 2d after autoclaving or casting, respectively. The dust or the slurry of the process shall be removed. They shall be taken in such a way

40、 that their longitudinal axis is: in the case of AAC: perpendicular to the rise of the mass during the manufacture; in the case of LAC: in the plane of the compression force acting in the component when used in the structure. The test specimens shall contain no reinforcing bars within the gauge leng

41、th. (If unavoidable, bars which are perpendicular to the test load can be accepted in exceptional cases. This shall be mentioned in the test report.) The loadbearing surfaces of the test specimens (i.e. the faces in contact with the platens of the compression testing machine) shall be plane, paralle

42、l to each other and perpendicular to the longitudinal surfaces of the test specimens (in the case of cylindrical test specimens to the generatrices). Planeness of loadbearing surfaces shall be checked across the two diagonals (in the case of cylinders across two orthogonal diameters) using a straigh

43、t-edge and, if necessary, a feeler gauge. Deviations exceeding 0,2 mm shall be adjusted by cutting and/or grinding, or by capping. In the case of LAC, deviations up to 0,5 mm may be tolerated, provided that equalizing layers of soft fibreboard according to 4f) are used. Deviations from planeness or

44、regular shape, respectively, of the other surfaces shall not exceed 1,0 mm. The angle between the loadbearing surfaces and the adjacent longitudinal surfaces (in the case of cylinders: the generatrices) of the test specimens shall not deviate from a right angle by more than 1 mm per 100 mm. This sha

45、ll be checked along both orthogonal middle axes (in the case of cylinders along two orthogonal diameters) of the loadbearing surfaces by means of a square and a 1 mm feeler gauge or similar instrument. Larger deviations shall be corrected by cutting or grinding. 5.5 Measurement of test specimens The

46、 dimensions of the test specimens shall be measured to an accuracy of 0,1 mm, using callipers. Length and width (in the case of cylindrical test specimens the diameter) of the cross-sectional area, A c , shall be measured at mid height at two opposite longitudinal sides. The cross-sectional area sha

47、ll be calculated using the mean values of the results of the measurements. The height of the test specimens shall be measured in the middle of two opposite longitudinal sides (in the case of cylinders along two opposite generatrices). The volume V of the test specimens shall be calculated by multipl

48、ying A c by the mean value of the results of the height measurements.Page 5 EN 1352 : 1996 BSI 1997 5.6 Conditioning of test specimens In the case of AAC the test specimens shall be dried till their mass related moisture content is (6 2) % (see note). In doing so the temperature shall not exceed 60

49、C. In the case of LAC the mass related moisture content shall be at least 4 %. After reaching the specified moisture content, the test specimens shall be stored, protected against moisture changes, for at least 24 h prior to the test at (20 5)C for ensuring uniform moisture distribution within the test specimen and thermal equilibrium with the temperature in the laboratory. Immediately before testing and before applying any of the devices for measurement of deformations the moist mass, m hum , of the test specimens shall be deter