1、June 2010 Translation by DIN-Sprachendienst.English price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91
2、.080.40; 91.100.30!$f3N“1671643www.din.deDDIN EN 12269-2Determination of the bond behaviour between reinforcing steel andautoclaved aerated concrete by the beam test Part 2: Long term testEnglish translation of DIN EN 12269-2:2010-06Bestimmung des Verbundverhaltens zwischen Bewehrungsstahl und dampf
3、gehrtetemPorenbeton mit Hilfe der Balkenprfung Teil 2: LangzeitprfverfahrenEnglische bersetzung von DIN EN 12269-2:2010-06Dtermination du comportement dadhrence entre les barres darmature et le btoncellulaire autoclav selon la mthode dessai de poutre Partie 2: Essai de longue dureTraduction anglaise
4、 de DIN EN 12269-2:2010-06SupersedesDIN EN 12269-2:2004-03www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1305.10 DIN EN 12269-2:2010-06 A comma is used as the decimal marker. National foreword This standard has been prepared by Te
5、chnical Committee CEN/TC 177 “Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineerin
6、g Standards Committee), Working Committee NA 005-07-09 AA Porenbeton und haufwerksporiger Leichtbeton (Sp CEN/TC 177). Amendments This standard differs from DIN EN 12269-2:2004-03 as follows: a) Clause 3 “Terms and definitions” has been added. b) Normative references have been updated. c) Provisions
7、 on the conditioning of test specimens have been added. d) Clause 5 “Apparatus” has been adapted to take account of the latest findings. e) In clause 7 “Testing procedure”, “long term loading” has been replaced by “cyclic loading”. f) The requirements for the test report have been expanded. Previous
8、 editions DIN EN 12269-2: 2004-03 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 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 t
9、erm test Dtermination du comportement dadhrence entre les barres darmature et le bton 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: Langzei
10、tprfverfahren This European Standard was approved by CEN on 23 January 2010. CEN 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 bibli
11、ographical references concerning such national standards may be obtained on application 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
12、of a CEN member into its own language and notified to the CEN Management Centre has 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, Icel
13、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, 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
14、Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12269-2:2010: EEN 12269-2:2010 (E) 2 Contents Page Foreword . 31 Scope . 42 Normative references . 43 Terms and definitions 44 Principle . 45 Apparatus
15、 46 Test specimens . 56.1 Sample . 56.2 Shape and size of test 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 Tes
16、t report . 9Bibliography . 11Figures Figure 1 Test specimen and loading arrangement 6Figure 2 Sampling scheme for test specimens 7DIN EN 12269-2:2010-06 EN 12269-2:2010 (E) 3 Foreword This document (EN 12269-2:2010) has been prepared by Technical Committee CEN/TC 177 “Prefabricated reinforced compon
17、ents 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 endorsement, at the latest by September 2010,
18、 and conflicting national standards shall be withdrawn at the latest 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
19、. This document supersedes EN 12269-2:2003. The European Standard 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,
20、 a number of standardized test methods are necessary. The main changes 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 cl
21、ause on “Apparatus“ has been adapted to take account of the latest 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
22、standards organizations of the following countries are bound to implement 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, Norw
23、ay, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12269-2:2010-06 EN 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 pr
24、efabricated reinforced components according to EN 12602. The test method 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 Norma
25、tive references The following referenced documents are indispensable for 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
26、density of autoclaved aerated concrete EN 679, Determination of the compressive 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 conc
27、rete by the “beam test” Part 1: Short term test 3 Terms and definitions 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
28、 reinforcing bars embedded in AAC is investigated in two steps as follows: 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
29、) C. The test specimen contains in longitudinal direction one single reinforcing 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 t
30、he long term bond strength fb,lobtained from final short term test. 3) 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
31、Saw for cutting test specimens from reinforced components. DIN EN 12269-2:2010-06 EN 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
32、 of the beam. 5.3 Straight-edge and 0,1 mm feeler gauges for checking the planeness 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
33、the cyclic loading and the final short term test. 5.5 For the cyclic loading: 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
34、sinusoidal cycles at a constant frequency up to 5 Hz and alternating between 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
35、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 on two rolle
36、rs positioned perpendicularly to the longitudinal axis of the beam with a distance 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
37、 supporting rollers and the load-applying rollers shall be manufactured from 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, exc
38、ept 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 vertic
39、al 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 compression for
40、ce) by more than 1 mm. 5.6 For the final short term test: same or a similar 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 machin
41、e or of the loading device. 5.7 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); slip of the bar at both ends relative to the end surface of the beam (accuracy 0,01 mm). 6
42、 Test specimens 6.1 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 investigated. DIN EN 12269-2:2010-06 EN 12269-2:2010 (E) 6 6.2 Shape and size of test specimens The test specimens shall be beams according t
43、o 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 mm to 30 mm with respect to the bottom face. If there are further longitudinal bars in the lower part (tensi
44、on zone when tested) of the beam, they shall be cut at mid-span. The beam shall contain 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 prot
45、ective coating), in millimetres; AAC cover: 10 mm c 30 mm. The total length of the 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 en
46、d 3 Strain measuring base lbBond length = (40 50) mm c AAC cover a(200 to 250) mm 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 Figur
47、e 1 Test specimen and loading arrangement If, in exceptional cases, the cover of 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
48、the AAC. DIN EN 12269-2:2010-06 EN 12269-2:2010 (E) 7 6.3 Number of test specimens A test 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
