1、BS EN12269-2:2010ICS 91.080.40; 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDDetermination ofthe bond behaviourbetween reinforcingsteel and autoclavedaerated concrete by thebeam testPart 2: Long term testThis British Standardwas published under theau
2、thority of the StandardsPolicy and StrategyCommittee on 31 March2010 BSI 2010ISBN 978 0 580 64059 9Amendments/corrigenda issued since publicationDate CommentsBS EN 12269-2:2010National forewordThis British Standard is the UK implementation of EN 12269-2:2010. Itsupersedes BS EN 12269-2:2003 which is
3、 withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/523, Prefabricated components of reinforced autoclavedaerated concrete and lightweight aggregate concrete with open structure.A list of organizations represented on this committee can be obtained onrequest to it
4、s secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 12269-2:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
5、 12269-2 March 2010 ICS 91.080.40; 91.100.30 Supersedes EN 12269-2:2003English Version Determination of the bond behaviour between reinforcing steel and autoclaved aerated concrete by the beam test - Part 2: Long term test Dtermination du comportement dadhrence entre les barres darmature et le bton
6、cellulaire autoclav selon la mthode dessai de poutre - Partie 2 : Essai de longue dure Bestimmung des Verbundverhaltens zwischen Bewehrungsstahl und dampfgehrtetem Porenbeton mit Hilfe der Balkenprfung - Teil 2: Langzeitprfverfahren This European Standard was approved by CEN on 23 January 2010. CEN
7、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 such national standards may be obtained on appli
8、cation to the CEN Management Centre 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 CEN Management Centre h
9、as the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
10、Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and
11、by any means reserved worldwide for CEN national Members. Ref. No. EN 12269-2:2010: EBS EN 12269-2:2010EN 12269-2:2010 (E) 2 Contents Page Foreword . 31 Scope . 42 Normative references . 43 Terms and definitions 44 Principle . 45 Apparatus 46 Test specimens . 56.1 Sample . 56.2 Shape and size of tes
12、t specimens 66.3 Number of test specimens . 76.4 Preparation of test specimens 77 Testing procedure. 87.1 Cyclic loading 87.2 Final short term test . 87.3 Dry density, moisture content and compressive strength of AAC 88 Test results 99 Test report . 9Bibliography . 11Figures Figure 1 Test specimen a
13、nd loading arrangement 6Figure 2 Sampling scheme for test specimens 7BS EN 12269-2:2010EN 12269-2:2010 (E) 3 Foreword This document (EN 12269-2:2010) has been prepared by Technical Committee CEN/TC 177 “Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concr
14、ete 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 endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the late
15、st by September 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12269-2:2003. The European Standard
16、EN 12269 consists of the following parts: Part 1: Short term test; Part 2: Long term test. In order to 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. The main cha
17、nges with respect to EN 12269-2:2003 are listed below: a) the clause “Terms and definitions“ has been added; b) the normative references have been updated; c) provisions on the conditioning of test specimens have been added; d) the clause on “Apparatus“ has been adapted to take account of the latest
18、 findings; e) “long term loading“ has been replaced by “cyclic loading“ in the clause on “Testing procedure“; f) the requirements for the test report have been expanded. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to im
19、plement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
20、Switzerland and the United Kingdom. BS EN 12269-2:2010EN 12269-2:2010 (E) 4 1 Scope This document specifies a method of determining the long term bond behaviour between reinforcing bars and autoclaved aerated concrete (AAC) in prefabricated reinforced components according to EN 12602. The test metho
21、d is conceived to obtain values for the long term bond strength fb,lwhich are obtained in a final short term test. The test is performed for different combinations of AAC type, bar shape, and corrosion protection systems. 2 Normative references The following referenced documents are indispensable fo
22、r the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 678, Determination of the dry density of autoclaved aerated concrete EN 679, Determination of the com
23、pressive strength of autoclaved aerated concrete EN 1353, Determination of moisture content of autoclaved aerated concrete EN 12269-1:2000, Determination of the bond behaviour between reinforcing steel and autoclaved aerated concrete by the “beam test” Part 1: Short term test 3 Terms and definitions
24、 For the purposes of this document, the following terms and definitions apply. 3.1 long term bond strength fb,lbond stress (residual bond strength) achieved at the final short term test 4 Principle The long term bond behaviour of reinforcing bars embedded in AAC is investigated in two steps as follo
25、ws: 1) Cyclic loading of a prismatic test specimen by a transverse four point load alternating between Fminand Fmaxat a constant frequency for a specified number of cycles at a temperature of (20 5) C or at a temperature of (50 5) C. The test specimen contains in longitudinal direction one single re
26、inforcing bar situated on the longitudinal median plane near the bottom surface (see EN 12269-1). 2) Final short term test (in the same condition as in step 1) according to EN 12269-1 on this test specimen in order to determine the long term bond strength fb,lobtained from final short term test. 3)
27、Prior to the test, the test specimens shall be stored with enough free space around them enabling sufficient air circulation for a period of (48 2) h in a room with a constant temperature of (20 5) C or (50 5) C. 5 Apparatus 5.1 Saw for cutting test specimens from reinforced components. BS EN 12269-
28、2:2010EN 12269-2:2010 (E) 5 5.2 Core drill with a diameter of the cutting edge of (200 to 300) mm, depending on the specimen height (see 6.4), for removing the AAC in the tensile zone of the cross-section in the midspan area of the beam. 5.3 Straight-edge and 0,1 mm feeler gauges for checking the pl
29、aneness of surface areas where loads and support reactions are transmitted. 5.4 Room capable of maintaining a temperature of (20 5) C or (50 5) C, for conditioning of test beams prior to the test and during the execution of the cyclic loading and the final short term test. 5.5 For the cyclic loading
30、: cyclic loading machine with a capacity of at least 20 kN, allowing the application of an alternating transverse four point load (see Figure 1) on a test specimen with a span of 600 mm to 1 200 mm for a specified number of sinusoidal cycles at a constant frequency up to 5 Hz and alternating between
31、 load levels Fminand Fmax. 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 one of the rollers shall be capable of being inclined in a plane perpendicular to the l
32、ongitudinal 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 on two rollers positioned perpendicularly to the longitudinal axis of the beam with a di
33、stance of (200 2) 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. Both the supporting rollers and the load-applying rollers shall be manufactured from
34、 steel and shall have a circular cross-section with a diameter between 15 mm and 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, except one of the supporting ones, shall be capable of rotating around its long
35、itudinal 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 vertical plane which shall not deviate by more than 1 mm from the axis of the comp
36、ression 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 compression force) by more than 1 mm. 5.6 For the final short term test: same or a similar
37、loading system as for 5.5, 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 machine or of the loading device. 5.7 Measuring system, capable of simultaneous me
38、asuring and registration of the following data: longitudinal strain in the bar at midspan (accuracy 2 % of the final measured value); slip of the bar at both ends relative to the end surface of the beam (accuracy 0,01 mm). 6 Test specimens 6.1 Sample The sample for the preparation of the test specim
39、ens shall be taken in such a manner that it is representative of the product to be investigated. BS EN 12269-2:2010EN 12269-2:2010 (E) 6 6.2 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 longitudin
40、al bar, of which bond is to be tested, is disposed in the vertical centre plane of the beam with a cover of 10 mm to 30 mm with 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 c
41、ontain no transverse reinforcement. For usual components the following dimensions shall be used: total height: h = (200 2) mm; width: b = (20 2) mm, where is the nominal diameter of the steel bar (without corrosion protective coating), in millimetres; AAC cover: 10 mm c 30 mm. The total length of th
42、e beam shall be chosen such that lb = (40 50) mm on each side, where lbis the bond length over which the bar is in contact with the AAC. Dimensions in millimetres Key 1 Transducer for vertical displacement 2 Free bar end 3 Strain measuring base lbBond length = (40 50) mm c AAC cover a(200 to 250) mm
43、 for AAC cover c = (10 to 30) mm or 300 mm for AAC cover c 30 mm, respectively bb = 20, where is the diameter of the reinforcing bar ch = 200 mm for AAC cover c = (10 to 30) mm and h = 300 mm for AAC cover c 30 mm Figure 1 Test specimen and loading arrangement If, in exceptional cases, the cover of
44、the longitudinal bar exceeds 30 mm, beams with a total height of h = (300 2) 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. BS EN 12269-2:2010EN 12269-2:2010 (E) 7 6.3 Number of test specimens A t
45、est set shall 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). 6.4 Preparation of test specimens The
46、 test specimens 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 reactio
47、ns will be applied, 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. At both ends of the beam, the AAC shall be removed from around the bar to be tested over a length of (100 2) mm in order to eliminate the in
48、fluence of support pressure on bond. Key 1 Cross-section of component 2 Direction of rise b Width of test specimens c AAC cover h Total height of test specimen hcompHeight of component W Width of component Figure 2 Sampling scheme for test specimens At midspan the beam shall be provided with a semi-
49、cylindrical hole, diameter (200 to 250) mm for beams with a total height of h = (200 2) mm (used for AAC cover c = 10 mm to 30 mm) and (300 2) mm for beams with a total height of h = (300 2) mm (used for AAC 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 length in order to fix a strain measuring device. Th
