EN 15416-2-2007 9714 Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 2 Static load test of multiple bondline specimens in co.pdf

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2、henolic and aminoplastic Test methods Part 2: Static load test of multiple bondline specimens in compression shearThe European Standard EN 15416-2:2007 has the status of a British StandardICS 83.180Adhesives for load bearing timber structures other than BRITISH STANDARDBS EN 15416-2:2007BS EN 15416-

3、2:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 56147 4Amendments/corrigenda issued since publicat

4、ionDate CommentsCompliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN 15416-2:2007.The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations r

5、epresented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15416-2December 2007ICS 83.180English

6、VersionAdhesives for load bearing timber structures other than phenolicand aminoplastic - Test methods - Part 2: Static load test ofmultiple bondline specimens in compression shearAdhsifs pour charpentes en bois portantes, de type autreque phnolique et aminoplaste - Mthodes dessai - Partie2 : Essai

7、de charge statique des prouvettes plan de jointmultiple en cisaillement par compressionKlebstoffe fr tragende Holzbauteile ausgenommenPhenolharzklebstoffe und Aminoplaste - Prfverfahren -Teil 2: Statische Belastungsprfung an Prfkrpern mitmehreren Klebstofffugen bei Druck-ScherbeanspruchungThis Europ

8、ean Standard was approved by CEN on 10 November 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 con

9、cerning such 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

10、 language and 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,

11、 Luxembourg, 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 r

12、ights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15416-2:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4

13、 3 Principle4 4 Apparatus .4 5 Selection and preparation of wood7 6 Test procedure.11 7 Expression of results and test report12 Bibliography 13 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 3 Foreword This document (EN 15416-2:

14、2007) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. 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 June 2008, and conflicting nationa

15、l standards shall be withdrawn at the latest by June 2008. This European Standard is one of a series dealing with test methods for adhesives for use in load bearing timber structures. The standard is published in support of Eurocode 5, Common unified rules for timber structures. The series consist o

16、f six test methods to assess the performance of adhesives after specified heat and humidity treatments (EN 302, Parts 1 to 4, EN 15416-2 and EN 15416-3) and two test methods to characterize the working properties of the adhesive (EN 15416-4 and EN 15416-5). Requirements for the adhesives are stated

17、in other standards, for instance requirements for one component polyurethane adhesives for load bearing timber structures are given in prEN 15425. Safety statement Persons using this document should be familiar with the normal laboratory practice, in applicable. This document does not purport to add

18、ress all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. According to the CEN/CENELEC Internal Regulations, the national standards organizations

19、 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, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, S

20、lovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 4 1 Scope This European Standard specifies a method of determining the ability of adhesive bonds to resist static l

21、oad. It is applicable to adhesives used in load bearing timber structures. It is suitable for the following applications: a) for assessing the compliance of adhesives according to prEN 15425; b) for assessing the suitability and quality of adhesives for load-bearing timber structures. This test is i

22、ntended primarily to obtain performance data for the classification of adhesives for load bearing timber structures according to their suitability for use in defined climatic environments. This method is not intended for use to provide numerical design data and does not necessarily represent the per

23、formance of the bonded member in service. It is not applicable to assessment of the suitability of adhesives for the manufacture of wood-based panels. 2 Normative references Not applicable. 3 Principle Glued test pieces are subjected to a constant compression shear load under a series of three diffe

24、rent climates. Number of failures and the amount of deformation is measured after the test specimens have passed through all the climate cycles. 4 Apparatus 4.1 Test jigs The test equipment is in principle similar to that described in ASTM D 353507a, with the exception of the spring characteristics

25、(Figure 1 and Figure 2). Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 5 Dimensions in millimetres Key 1 top plate 2 spacer plate 3 base plate 4 tension rod x 4, diameter 15,9 mm 5 centre rod x 1, diameter 15,9 mm Figure 1 Test

26、 jig Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 6 Dimensions in millimetres Key 1 top plate 2 spacer plate 3 base plate 4 tension rod x 4, diameter 15,9 mm 5 centre rod x 1, diameter 15,9 mm Figure 2 Dimensions of plates and

27、 rods Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 7 If equipment according to ASTM D 353507a is used, distance blocks need to be placed over and under the specimen. The distance blocks shall be prepared in such a way that the

28、 two contact surfaces, between the distance block and the jig and between the distance block and the specimen, are parallel. Blocks produced from several pieces of plywood bonded together have been found suitable. Distance blocks made by metal should be avoided. Dimension of distance blocks: 47,6 mm

29、 50,8 mm ca. 100,0 mm. NOTE 1 Reduced height of test jig. Since the length of the specimens is shorter than in ASTM D353507a, the height of the test jigs can be reduced correspondingly. Minimum height of distance pieces: 25 mm. The spring shall have the following characteristics: outside diameter (u

30、nloaded): 105 mm; end fix: both ends fixed and grounded; free length: 320 mm; compression at maximum load 45 mm to 50 mm. NOTE 2 A spring rate of 81 N/mm has shown to be suitable. 4.2 Heating chamber The heating chamber shall be capable of maintaining (70 2) C. 4.3 Climate chamber The climate chambe

31、r shall be capable of maintaining the two climates (20 2) C and (85 5) % relative humidity, and (50 2) C and (75 5) % relative humidity. 4.4 Testing machine A universal testing machine is required for applying the load to the test jigs. 5 Selection and preparation of wood 5.1 General Untreated beech

32、 wood (Fagus sylvatica L.) with a density of (700 50) kg/m at (12 1) % moisture content shall be used. The material shall be straight grained and free from knots. The angle of the annual rings to the surface to be bonded should be between 30 and 60. The parts, of which the specimen is built of, shou

33、ld have the same direction for the annual rings in the cross section by gluing (Figure 3). Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 8 Figure 3 Orientation of annual rings in cross section of lamination The wood shall be fr

34、ee of decay, machining defects (such as chipped grain, dubbed ends, feed roll polish, coarse knife marks and feed roll compression) and any drying defects such as case hardening, collapse, splits or checks. Condition the wood at (20 2) C and a relative humidity of (65 5) % until a moisture content o

35、f (12 1) % has been obtained. Plane each lamination immediately before or not more than 4 h before applying the test adhesive. 5.2 Preparation of laminations Three laminated wood members shall be prepared in order to produce six test samples. The laminated members shall be prepared from boards (16,0

36、 0,1) mm thick (after planning) by (60,0 0,1) mm wide by (305,0 0,1) mm along the grain. Each laminated member shall be made from two outer lamellae as above and alternate spacers and wood sections for the inner part. The wood sections shall be sliced from a third board identical to those above. The

37、 wood sections shall be (28,5 0,1) mm along the grain by (16,0 0,1) mm thick by (60,0 0,1) mm wide, see Figure 4. Spacers have to be made of suitable material, which makes it possible to remove them without destroying the specimen or disturb the positioning of the central pieces. Dimension of spacer

38、s: Length (6,4 0,1) mm, thickness slightly less than the mid section pieces, width (60,0 0,1) mm. NOTE 1 Spacers made from PTFE has shown to be a suitable material. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 9 Dimensions in

39、millimetres Figure 4 Test assembly prior to bonding Figure 5 Test assembly after planing The centre layer of the assembly shall be made of 7 spacers and 8 wood sections alternately placed tightly adjacent to each others, see Figure 4. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008

40、 08:28, Uncontrolled Copy, (c) BSIEN 15416-2:2007 (E) 10 The wood sections should be slightly thicker than the spacers to obtain adequate pressure on the glue lines. The gluing has to be done according to the suppliers recommendations. Carefully clamp the mid section lengthwise to be sure that no mo

41、vement will occur when pressing the whole piece together (Figure 4). NOTE 2 It has been found that running a 13 mm wide piece of tape completely around the 15 loose pieces holds them together when mounting the laminations. The outer lamellas shall then be applied overlapping approximately 13 mm at e

42、ach end and the entire assembly carefully clamped and the adhesive cured as recommended. The positioning of the centrepieces shall be secured. Spacers shall be removed and excess adhesive removed as soon as it can be done without moving the centrepieces. The spacers shall be pushed gently (not impac

43、t driven) out. After curing each three ply laminated assembly shall be trimmed along the sides to leave a width of (50,8 0,1) mm, see Figure 5. After gluing, the specimens shall be conditioned for a minimum of 14 days in standard atmosphere 20 C and 65 % RH before the load is applied. Average thickn

44、ess of the bond lines is registered. 5.3 Preparation of test samples The outer lamellas of the specimen shall then be notched with a width of (3,2 0,1) mm. The notches shall divide each centre piece symmetrically. Notching should be to, but not beyond, the adhesive layer. From each of the three lami

45、nations, two test specimens with length (133,6 0,1) mm are made, each containing four centre pieces. Each specimen will then contain a total of 12 bond lines (nominal dimension 50,8 mm 12,7 mm) for axial compression loading, providing a series of 6 pairs load bearing bond lines each of which having

46、a total nominal bond line area of 1 290 mm. The two outer lamellae are then trimmed, in order to make the terminal surfaces plane (Figure 6). Figure 6 The final shape of the specimen (48,0 mm 50,8 mm 133,6 mm) Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 23/04/2008 08:28, Uncontrolled Copy

47、, (c) BSIEN 15416-2:2007 (E) 11 6 Test procedure 6.1 Application of load Prior to testing, use a straightedge and a razor blade to scribe lines perpendicular to every adhesive bond line for measuring possible slippage (see Figure 6). Insert the test specimens within the guides of the test jigs. Posi

48、tion spacer plate no. 2 on top. Insert the spring and position spacer plate no. 1 on top of the spring. Exert a gentle compression and position the corner nuts. Load the entire unit in a compression testing machine to a total load of 3 870 N, resulting in a nominal shear stress in the bond lines of

49、3,0 N/mm. Tighten the corner nuts by hand to maintain spring compression. Position the keeper nut on the centre rod and tighten to within 9,5 mm of the top plate, thus retaining the spring in case of bond line failures. Corner nuts shall be fixed within 2 min from start of applying load. Climate treatment shall be started immediately after loading. 6.2 Test climates The 6 clamped specimens are exposed for the following climate cycle according to Table 1. Table 1 Climate trea