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1、BRITISH STANDARD BS EN 12269-2:2003 Determination of the bond behaviour between reinforcing steel and autoclaved aerated concrete by the “beam test” Part 2: Long term test The European Standard EN 12269-2:2003 has the status of a British Standard ICS 91.080.40; 91.100.30 ? Licensed Copy: sheffieldun
2、 sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12269-2:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 August 2004 BSI 9 August 2004 ISBN 0 580 44223 3 National foreword This British Standard is
3、the official English language version of EN 12269-2:2003. The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregate concrete with open structure, which has the responsibility to: A
4、list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Stan
5、dards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standar
6、d does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European
7、developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since public
8、ation Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12269-2 December 2003 ICS 91.080.40; 91.100.30 English version Determination of the bond behaviour between reinf
9、orcing steel and autoclaved aerated concrete by the “beam test” - Part 2: Long term test Dtermination du comportement de ladhrence entre les barres darmatures et le bton cellulaire autoclav par la mthode dessai de poutre - Partie 2: Essai de longue dure Bestimmung des Verbundverhaltens zwischen Bewe
10、hrungsstahl und dampfgehrtetem Porenbeton mit Hilfe der Balkenprfung - Teil 2: Langzeitprfverfahren This European Standard was approved by CEN on 1 September 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standa
11、rd 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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, Ger
12、man). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Fin
13、land, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de S
14、tassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12269-2:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12269-2:2003 (E) 2 Content
15、s Foreword3 1Scope 3 2Normative references 3 3Principle3 4Apparatus .4 5Test specimens5 5.1Sample 5 5.2Shape and size of test specimens5 5.3Number of test specimens6 5.4Preparation of test specimens6 5.5Conditioning of test specimens .7 6Testing procedure7 6.1Long term loading7 6.2Final short term t
16、est 7 7Test results.8 8Test report 8 Figures Figure 1 Test specimen and loading arrangement 5 Figure 2 Sampling scheme for test specimens. 6 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12269-2:2003 (E) 3 Foreword This document EN 1226
17、9-2:2003 has been prepared by Technical Committee 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, e
18、ither by publication of an identical text or by endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest by June 2004. The European Standard EN 12269 consists of the following parts: - Part 1: Short term test; - Part 2: Long term test. In order to
19、meet the performance requirements as laid down in the product standard for prefabricated components of autoclaved aerated concrete a number of standardized test methods are necessary. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries a
20、re bound to implement this European Standard : Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This European Standard
21、specifies a method of determining the long term bond behaviour between reinforcing bars and autoclaved aerated concrete (AAC) in prefabricated reinforced components according to prEN 12602. The test method is conceived to obtain values for the long term bond strength fb,l which are obtained in a fin
22、al short term test. The test is performed for different combinations of AAC type, bar shape, and corrosion protection systems. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the app
23、ropriate places in the text, and 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 pub
24、lication referred to applies (including amendments). EN 678, Determination of dry density of autoclaved aerated concrete. EN 679, Determination of compressive strength of autoclaved aerated concrete. EN 12269-1:2000, Determination of the bond behaviour between reinforcing steel and autoclaved aerate
25、d concrete by the “beam test” Part 1: Short term test. prEN 12602, Prefabricated reinforced components of autoclaved aerated concrete. 3 Principle The long term bond behaviour of reinforcing bars embedded in AAC is investigated in two steps as follows: Licensed Copy: sheffieldun sheffieldun, na, Sat
26、 Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12269-2:2003 (E) 4 1) Sustained loading of a prismatic test specimen (beam) by a constant transverse quarter point load for a period of 1 year at an elevated temperature of (50 5) C. The test specimen contains in longitudinal direction o
27、ne single reinforcing bar situated on the longitudinal median plane near the bottom surface (see EN 12269-1). 2) Final short term test according to EN 12269-1 on this test specimen in order to determine the long term bond strength fb,l obtained from final short term test. The long term bond strength
28、 fb,l is defined as the ultimate bond stress (residual bond strength) achieved at the final short term test. 4 Apparatus a) a saw for cutting test specimens from reinforced components; b) a core drill with a diameter of the cutting edge of (200 to 300) mm, depending on the specimen height, for remov
29、ing the AAC in the tensile zone of the cross-section in the midspan area of the beam; c) a straight-edge and 0,1 mm feeler gauges for checking the planeness of surface areas where loads and support reactions are transmitted; d) a room capable of maintaining a temperature of (50 5) C and a relative h
30、umidity of (55 5) %, for conditioning of test beams prior to the test and for the execution of the long term loading and the final short term test; e) for the long term loading: a loading system with a capacity of at least 20 kN, allowing the application of a constant quarter point transverse load (
31、see Figure 1) on a test beam with a span of (600 to 1200) mm for a period of 1 year at a temperature of (50 5) C. The beam shall rest on two supporting rollers through steel distribution plates having a width of (50 2) mm and a thickness of 10 mm, extending over the full width of the beam. At least
32、one of the rollers shall be capable of being inclined in a plane perpendicular to the longitudinal axis of the beam. The supporting rollers shall be placed at a distance of 50 mm from the end surfaces of the beam. The load shall be applied equally to both beam parts, using a bridge profile resting o
33、n two rollers positioned perpendicularly to the longitudinal axis of the beam with a distance of 200 mm. Between the rollers and the upper surface of the beam steel distribution plates with a width of (50 2) mm and a thickness of 10 mm, extending over the full width of the beam, shall be inserted. B
34、oth the supporting rollers and the load-applying rollers shall be manufactured from steel and shall have a circular cross-section with a diameter between (15 to 40) mm. Their length shall be at least equal to the width of the beam. The axes of all rollers shall be parallel to each other. Each roller
35、, except one of the supporting ones, shall be capable of rotating around its longitudinal axis and of being inclined in a plane normal to the longitudinal axis of the beam. After correct centring in the testing machine, the axes of inclination of the three inclinable rollers shall be situated on a v
36、ertical plane which shall not deviate by more than 1 mm from the axis of the compression force of the testing machine. The middle axis between the loading rollers or the supporting rollers, respectively, shall not deviate from the vertical axis of the testing machine (axis of the vertical compressio
37、n force) by more than 1 mm. f) for the final short term test: the same or a similar loading system as for e), but with a capacity of approximately 30 kN. Deflections shall be determined at midspan by means of a transducer and shall be used for control of rate of movement of the platen of the testing
38、 machine or of the loading device. g) a measuring system, capable of simultaneous measuring and registration of the following data: longitudinal strain in the bar at midspan (accuracy 2 % of the final measured value); Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Un
39、controlled Copy, (c) BSI EN 12269-2:2003 (E) 5 slip of the bar at both ends relative to the end surface of the beam (accuracy 0,01 mm). 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 inve
40、stigated. 5.2 Shape and size of test specimens The test specimens shall be beams according to Figure 1 which are cut from a reinforced component in a way that the longitudinal bar, of which bond is to be tested, is disposed in the vertical centre plane of the beam with a cover of (10 to 30) mm with
41、respect to the bottom face. If there are further longitudinal bars in the lower part (tension zone when tested) of the beam, they shall be cut at mid-span. The beam shall contain no transverse reinforcement within the AAC. For usual components the following dimensions shall be used: total height: h
42、= 200 mm; width: b = 20 , where is the nominal diameter of the steel bar (without corrosion protective coating), in millimetres; concrete cover: 10 mm c 30 mm. The total length of the beam shall be chosen such that l b = 40 50 mm on each side, where l b is the bond length over which the bar is in co
43、ntact with the AAC. If, in exceptional cases, the cover of the longitudinal bar exceeds 30 mm, beams with a total height of h = 300 mm shall be used. At both ends of the beam, the reinforcing bar to be tested shall protrude for at least 150 mm over the vertical end face of the AAC. Dimensions in mil
44、limetres Key 1Transducer for vertical displacement 2Free bar end 3Strain measuring base lb Bond length = 40 50 cConcrete cover a (200 to 250) mm for concrete cover c = (10 to 30) mm or 300 mm for concrete cover c 30 mm, respectivly b b = 20 , where is the diameter of the reinforcing bar c h = 200 mm
45、 for concrete cover c = (10 to 30) mm and h = 300 mm for concrete cover c 30 mm Figure 1 Test specimen and loading arrangement Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:19:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12269-2:2003 (E) 6 5.3 Number of test specimens A test set shal
46、l consist of three test specimens. Whenever 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 2). 5.4 Preparation of test specimens The test specim
47、ens shall be cut from the reinforced component, taking special care to avoid any early damage of bond. All surfaces shall be levelled sufficiently to ensure correct dimensions. The planeness of the surfaces shall be checked along the lines where the loading forces and the support reactions will be a
48、pplied, by means of a straight edge and, if necessary, by means of feeler gauges. Deviations by more than 0,1 mm in these areas shall be corrected by grinding. At both ends of the beam, the AAC shall be removed from around the bar to be tested over a length of 100 mm in order to eliminate the influe
49、nce of support pressure on bond. At midspan the beam shall be provided with a semi-cylindrical hole, diameter (200 to 250) mm for beams with a total height of h = 200 mm (used for concrete cover c = (10 to 30) mm) and 300 mm for beams with a total height of h = 300 mm (used for concrete cover c 30 mm). This hole is drilled horizontally (or cut out otherwise), perpendicularly to the longitudinal axis, leaving the bar free over a sufficient le