1、BRITISH STANDARDBS EN 1739:2007Determination of shear strength for in-plane forces of joints between prefabricated components of autoclaved aerated concrete or lightweight aggregate concrete with open structureThe European Standard EN 1739:2007 has the status of a British StandardICS 91.100.30g49g50
2、g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 1739:2007This British Standard was published under the authority of the Standards Policy and Strateg
3、y Committee on 30 April 2007 BSI 2007ISBN 978 0 580 50626 0National forewordThis British Standard was published by BSI. It is the UK implementation of EN 1739:2007. It supersedes BS EN 1739:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B/523, P
4、refabricated components of reinforced autoclaved aerated concrete and lightweight aggregate concrete with open structure.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a co
5、ntract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1739April 2007ICS 91.100.30 Supersedes EN 1739:1998 En
6、glish VersionDetermination of shear strength for in-plane forces of jointsbetween prefabricated components of autoclaved aeratedconcrete or lightweight aggregate concrete with open structureDtermination de la rsistance au cisaillement desjonctions entre des lments prfabriqus raliss enbton cellulaire
7、 autoclav ou en bton de granulats lgers structure ouverte, sous leffet de forces agissant dans leplan des lmentsBestimmung der Schubtragfhigkeit von Fugen zwischenvorgefertigten Bauteilen aus dampfgehrtetem Porenbetonoder haufwerksporigem Leichtbeton bei Belastung inBauteilebeneThis European Standar
8、d was approved by CEN on 24 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning suc
9、h nationalstandards 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 translationunder the responsibility of a CEN member into its own language a
10、nd notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
11、, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of ex
12、ploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1739:2007: EEN 1739:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Apparatus .4 5 Test specimens5 6 Testing procedure6 7 Test results.7 8 Test report 8 Bibliography 15
13、 Figures Figure 1 Example A for reference test set-up for grouted joint 9 Figure 2 Example B for reference test set-up for grouted joint 10 Figure 3 Example A for reference test set-up for mechanical joint 11 Figure 4 Example B for reference test set-up for mechanical joint 12 Figure 5 Example A for
14、 alternative test set-up13 Figure 6 Example B for alternative test set-up14 EN 1739:2007 (E) 3 Foreword This document (EN 1739:2007) has been prepared by Technical Committee CEN/TC 177 “Prefabricated reinforced components of autoclaved aerated concrete or light-weight aggregate concrete with open st
15、ructure”, 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 October 2007, and conflicting national standards shall be withdrawn at the latest by October 2007
16、. This document supersedes EN 1739:1998. In order to meet the performance requirements as laid down in the product standards for prefabricated reinforced components of autoclaved aerated concrete and of lightweight aggregate concrete with open structure, a number of standardized test methods are nec
17、essary. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
18、 Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 1739:2007 (E) 4 1 Scope This European Standard specifies methods of determining the shear strength for in-plane forces of joints between
19、 prefabricated components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweight aggregate concrete with open structure (LAC) according to EN 1520. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated re
20、ferences, 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 compressive strength of autoclaved aerated concrete
21、 EN 992, Determination of the dry density of lightweight aggregate concrete with open structure EN 1353, Determination of moisture content of autoclaved aerated concrete EN 1354, Determination of compressive strength of lightweight aggregate concrete with open structure 3 Principle The shear strengt
22、h for in-plane forces of longitudinal joints between two adjacent prefabricated AAC- or LAC-components or sections thereof is determined by applying an in-plane shear force parallel with to the joint. The load is increased continuously or in steps until failure of the joint. The load-displacement di
23、agram and the failure load are determined. The shear strength is determined from the failure load. 4 Apparatus a) saw for cutting components and test specimens; b) compression testing machine or a hydraulic jack, capable of applying a compressive load without shock continuously or in steps. The prec
24、ision of the compression testing machine or of the hydraulic jack and of the load indication shall be such that the failure load can be determined to an accuracy of 3 %. The measuring range shall be such that the failure load is higher than one-tenth of the range used; c) callipers and/or rule, capa
25、ble of measuring the dimensions of the test specimens and the joints to an accuracy of 1 mm; d) loading frame and/or devices (e.g. steel plates, flat steel bars, steel rollers, soft fibre board) according to Figures 1, 2, 3 or 4 (or Figures 5 or 6, for alternative tests) for transmitting the load an
26、d support reactions to the test specimen; e) dial gauge or a displacement transducer with a reading accuracy of 0,01 mm for measuring the relative displacement between the loaded and the supported part of the test specimen. EN 1739:2007 (E) 5 5 Test specimens 5.1 Sample The sample for the preparatio
27、n of the test specimens shall be taken in such a manner that it is representative of the product to be investigated. In the case of AAC, the direction of rise of the mass during manufacture shall be marked on the components. 5.2 Shape and size of test specimens The test specimen consists of two conn
28、ected parts of prefabricated reinforced components with the actual thickness t of the component and a length of l = 150 mm. The width of one part is w1= 100 mm and the width of the other part is w2= 200 mm, the total width of the specimen is then w = 300 mm plus the thickness of the joint, see Figur
29、es 1 and 2. If the joint system is mechanical, e.g. nails and plates or similar or toothed joints, the dimensions may be increased, to ensure space for the tooth or mechanical connections, as long as the ratio between the width and the length is 1 (e.g. w = l = 600 mm), see Figures 3 and 4. 5.3 Numb
30、er of test specimens A test set shall consist of at least three test specimens. 5.4 Preparation of test specimens AAC shall be allowed to cool for at least 2 d after autoclaving before assembling of the two parts. LAC test specimens shall be at least 21 d old before assembling the two parts and at l
31、east 28 d at testing. Before jointing, length, thickness and width of the parts to be connected shall be measured. The shape and dimensions of the longitudinal faces adjacent to the joint (e.g. tongue and groove) shall also be determined. For a mechanical jointing system dimensions and material prop
32、erties of all parts shall be indicated. If the parts to be connected are frozen or cold, they shall be stored with sufficient space between each other at room temperature for at least 2 d before jointing. In the case of a grouted joint the test specimens shall be assembled as shown in Figures 1 or 2
33、. If the joint system is mechanical, e.g. nails and plates or similar, the two parts shall be joined together dry, without grouting (see Figures 3 or 4). There shall be at least two mechanical fixings or grouted dowels along such a joint. Defined tolerances for the mechanical fixings may be taken in
34、to account. If the joint is grouted with mortar or concrete, the two parts of the test specimen shall be fixed temporarily together in at least two places before grouting. After hardening of the grouting material the fixing shall be removed. Grouting shall be performed according to the instructions
35、of the manufacturer of the components. The grouting procedure (including e.g. any pre-wetting of the concrete adjacent to the joint), the recipe, consistency and the temperature of the grouting material shall be recorded in the test report. A grouted joint shall be protected against moisture loss un
36、der plastic sheet immediately after grouting and shall be allowed to harden at room temperature for at least 7 d before the test. 5.5 Conditioning of test specimens The test specimens shall be kept at room temperature before and during testing. The moisture content of the concrete at testing shall b
37、e at least 6 % by mass for AAC and at least 4 % by mass for LAC. This shall be checked after the shear test (see 6.2). EN 1739:2007 (E) 6 NOTE When in doubt about the moisture content, this can be estimated in advance by testing related samples of material. 5.6 Alternative test specimens Alternative
38、 test specimens may be used, when the basic principle in this test standard is used. A correlation between the results from the alternative test method used shall be established with the reference method given above. In Figure 5 and Figure 6 test set-ups for alternative tests are presented. The test
39、s can be carried out with or without transverse pressure. 6 Testing procedure 6.1 Shear test The test specimen is placed in the testing machine or loading frame as shown in Figures 1 to 6. If the loaded and the supported surfaces of the test specimen deviate from planeness by more than 0,1 mm (to be
40、 checked over the two diagonals by means of a straight-edge and, if necessary, a feeler gauge), an intermediate layer of soft fibre board, gypsum plaster or mortar shall be applied between the concrete and the adjacent steel parts as indicated in the figures. In the case of standard tests using a lo
41、ading frame according to Figures 1 or 3, the support plate at the bottom shall be placed close to the joint, ensuring that the opposite loaded part of the test specimen can move freely downwards. The supported part shall be clamped to the support plate at bottom by tightening the clamp screw pressin
42、g on the ball-and-socket joint placed on the top of the component. This is not necessary if a test set-up according to Figures 2 or 4 is chosen. The load shall be applied as line load parallel to the joint, reaching over the whole thickness of the test specimen. The load transmitting steel bar shall
43、 be placed close to the joint, in the specified distance from the adjoining edge of the joint (see Figure 1 to 4). It shall be capable of being inclined in a plane parallel to the joint. A dial gauge or displacement transducer shall be installed as shown in the figures for measuring the relative dis
44、placement over the joint between the loaded and the supported part of the test specimen. In the case of lateral supports, it shall be ensured that the supporting rollers are capable of moving smoothly to prevent any significant influence of frictional forces on test results. After having taken an in
45、itial reading of the dial gauge or the displacement transducer, the load is applied continuously or in steps, depending on the equipment used for measuring and recording the displacement. In the case of continuous loading, the loading rate shall be chosen such that failure will occur within (10 to 2
46、0) min. In the case of incremental load application, the size of the load steps shall not exceed 1/10 of the estimated failure load. Within the individual steps the load may be applied rapidly, but without shock. The displacement gauge shall be read immediately after reaching a new load level and ad
47、ditionally 1 min later under the same load. The procedure shall be repeated until failure occurs. In the case of substantial creep, the load shall be kept constant, and readings shall be taken every other minute until creep ceases, but not longer than 10 min. The formation of cracks or irregularitie
48、s shall be recorded in the test report. 6.2 Investigations after shear test Observations on the extent of filling of grouted joints shall be indicated in the test report. Samples shall be taken from the components in the vicinity of the joint to check the moisture content of the concrete. In the cas
49、e of AAC this shall be done in accordance with EN 1353. In the case of LAC the procedure described in EN 1356:1996, Clause 7, may be used. EN 1739:2007 (E) 7 Additional samples shall be taken in order to determine the compressive strength and the dry density of the concrete. They shall be extracted from undamaged parts of the components tested or from a component or block from the same mould or mixer batch as used for the components of the shear test. The compressive strength shall be determined according to EN 679 (AAC) or EN 1354 (LAC). The dry den
