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1、BRITISH STANDARD BS EN 15416-3:2007 Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear ICS 83.180 +A1:2010 National foreword This British Standard is the UK
2、implementation of EN 15416-3:2007+A1:2010. It supersedes BS EN 15416-3:2007 which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CE
3、N amendment A1 is indicated by . The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives. 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 provision
4、s of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 15416-3:2007+A1:2010 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007
5、BSI 2010 Amendments/corrigenda issued since publication Date Comments 31 July 2010 Implementation of CEN amendment A1:2010 ISBN 978 0 580 63860 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15416-3:2007+A1 February 2010 ICS 83.180 Supersedes EN 15416-3:2007 English Version Adhesives for loa
6、d bearing timber structures other than phenolic and aminoplastic - Test methods - Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear Adhsifs pour structures portantes en bois, de type autre que phnolique et aminoplaste - Mthodes dessai - Partie 3: Essa
7、i de dformation par fluage dans des conditions climatiques cycliques avec des prouvettes charges en cisaillement par flexion Klebstoffe fr tragende Holzbauteile ausgenommen Phenolharzklebstoffe und Aminoplaste - Prfverfahren - Teil 3: Prfung der Kriechverformung unter zyklischen Klimabedingungen an
8、Prfkrpern bei Biege- Scherbeanspruchung This European Standard was approved by CEN on 23 September 2007 and includes Amendment 1 approved by CEN on 4 January 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standa
9、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 CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French,
10、 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 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, C
11、yprus, 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, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION
12、 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 by any means reserved worldwide for CEN national Members. Ref. No. EN 15416-3:2007+A1:2010: E EN 15416-3:2007+A1:2010 (E) 2 Contents
13、 Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 5 5 Apparatus .5 5.1 Test jig 5 5.2 Climate chamber 6 5.3 Measuring gauge .6 6 Preparation of test samples 6 7 Test procedure, evaluation and expression of results 8 7.1 Test procedure .8 7.2 Evaluation and ex
14、pression of results 9 8 Test report . 10 BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 3 Foreword This document (EN 15416-3:2007+A1:2010) 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 sta
15、tus of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2010, and conflicting national standards shall be withdrawn at the latest by August 2010. Attention is drawn to the possibility that some of the elements of this document may be the subj
16、ect of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1, approved by CEN on 2010-01-04. This document supersedes EN 15416-3:2007. The start and finish of text introduced or altered by amendment is indica
17、ted in the text by tags !“. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greec
18、e, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Safety statement Persons using this document should be familiar with the normal laboratory practice, if applic
19、able. This document does not purport to address 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. !Environmental statement It is understood th
20、at some of the material permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, the user of the standard shall take c
21、are to carry out an appropriate disposal of the wastes, according to local regulation.“ BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 4 1 Scope This European standard specifies a method for determining the creep deformation of bonded specimens loaded in bending shear. It is applicable to ad
22、hesives used in load-bearing timber structures. It is suitable for the following applications: a) for assessing the compliance of adhesives to !EN 15425“ Adhesives, One component polyurethane, for load bearing timber structures - Classification and performance requirements; b) for assessing the suit
23、ability and quality of adhesives for load-bearing timber structures. This test is intended 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
24、to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not applicable for assessing the suitability of adhesives for the manufacture of wood- based panels 2 Normative references The following referenced documents are indispensable f
25、or 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 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and per
26、formance requirements EN 923:2005, Adhesives Terms and definitions !EN 15425“, Adhesives One component polyurethane for load bearing timber structures Classification and performance requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005
27、 and the following apply. 3.1 relative creep value, kdef(t) time-dependent increase of the deformation of one specimen NOTE By means of the deflection w(t) and the initial deflection w(0), the relative creep value is calculated using the following formula: 1 )0( )( )( w tw tkdef (1) where w(t) is th
28、e deflection at times t; w (0) is the initial deflection immediately after initial loading, measured 1 min after the loading of the individual specimen; kdef (t) is the relative creep value. BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 5 3.2 ratio of relative creep, RCi(t) ratio of the rel
29、ative creep values kdef (t) of two matched specimens i, tested adhesive,i and PRF,i, at time t NOTE By means of kdef (t),tested adhesive,i and kdef (t),PRF,i within one pair of matched bending specimens (i), the ratio of relative creep is calculated using the following formula: iPRFtk iadhesiveteste
30、dtk tR def def Ci ,),( ,),( )( (2) where def(t), tested adhesive,i is the relative creep value of the respective tested adhesive sample i; def(t), PRF,i is the relative creep value of the respective phenolic-resorcinol (PRF) - sample i; RCi (t) is the ratio of relative creep of matched pair of bendi
31、ng specimens i. 4 Principle Bending specimens of a constant cross-section are subjected to constant load at cyclically varying climate conditions. Specimens bonded with the adhesive to be tested are compared with specimens bonded with a PRF- adhesive conforming to the requirement of adhesive type I
32、as specified in EN 301. 5 Apparatus 5.1 Test jig A test jig being capable of applying a load of 2 000 N in each loading point with a loading principle as shown in Figure 1. BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 6 Dimensions in millimetres Key A Measuring gauge for the measuring of t
33、he deflection of the specimen Figure 1 Loading principle for the bending test 5.2 Climate chamber A climate chamber capable of maintaining the two test climates (20 2) C and (85 5) % RH and (45 2) C and (40 5) % RH. The climate chamber shall be capable of alternating between the two test climates in
34、 10 h. 5.3 Measuring gauge A measuring gauge enabling readings of the deflection of the specimens with an accuracy of 0,01 mm, see Figure 1. 6 Preparation of test samples !Five boards of straight grained, defect-free spruce wood (Picea abies L.) of density (425 25) kg/m3 shall be used to manufacture
35、 a total of 5 pairs of matched bending specimens with bondline thickness (0,3 0,1) mm. Each board shall have a width of at least 150 mm, a length of at least 1 260 mm and a thickness of at least 33 mm, and shall be used to manufacture one pair of 2 matched bending specimens according to the scheme s
36、hown in Figure 2. Each of the 2 matched bending specimens consists of 2 boards of spruce wood of equal sizes. Each board shall have a thickness in the bond line area of (25 0,1) mm (after final preparation), a width of at least 70 mm (before the bonding) and a length of at least 625 mm (before the b
37、onding), with an angle of the growth rings between 30 and 60 (in relation to the surface to be bonded). BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 7 Not more than 24 h before the bonding, the boards are planed to their final thickness and one of the two boards of each specimen is prepare
38、d at the periphery in an appropriate manner to ensure a bondline thickness of (0,3 0,1) mm and to ensure that there is no loss of adhesive during the bonding of the test specimen. NOTE The use of a 0,2 mm thick cardboard spacer frame with a width of maximum 10 mm (bonded on a planed board with the f
39、inal thickness of (25 0,1) mm), or milling a 60 mm wide groove with a depth of (0,2 0,1) mm into a (25,2 0,1) mm thick, planed board, have shown to be suitable methods for the production of samples with a bondline thickness of (0,3 0,1) mm. Each specimen is glued from the two boards with an orientat
40、ion of the growth rings as shown in Figure 2. One specimen of the pair shall be glued with the adhesive tested for assessment and the other specimen of the pair shall be glued with an adhesive of thermosetting phenolic-resorcinol type conforming to the requirements for an adhesive of type I as speci
41、fied in EN 301. The adhesives shall be used in accordance with the recommendations of the adhesive manufacturer. After pressing and curing for at least seven days in standard climate (20 2) C and (65 5) % RH, the specimens are planed to final width of (50 0,1) mm and cut to final length of (600 1,0)
42、 mm, ensuring that the prepared periphery of the samples is cut off completely from the test specimen, so that the specimen has a constant bondline thickness of (0,3 0,1) mm. The thickness of the samples shall not be changed after bonding in order to provide samples with a thickness of (50,3 0,1) mm
43、.“ BS EN 15416-3:2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 8 Dimensions in millimetres Key 1 = tested adhesive 1 2 = tested adhesive 2 Figure 2 Cutting scheme and build-up of matched pair of bending shear specimens 7 Test procedure, evaluation and expression of results 7.1 Test procedure The bending
44、tests shall be performed as four point bending tests with the loads applied at a distance of one third of the span of 500 mm from the supports, see Figure. 1. Each of the two loads shall be 2 000 N. The loading shall be applied symmetrically with respect to mid-span. The loading procedure shall be s
45、mooth and no impact loading shall occur. The bearing lengths at the supports and at the load application points shall be 60 mm and the bearing width shall be at least 50 mm. This loading results in a maximum bending stress level of 16 N/mm and a maximum shear stress level of 1,2 N/mm. BS EN 15416-3:
46、2007+A1:2010 EN 15416-3:2007+A1:2010 (E) 9 The specimens shall be subjected to a cyclic stepped climate as shown in Table 1, alternating repeatedly between a constant climate of (20 2) C and (85 5) % RH, followed by a climate of (45 2) C and (40 5) % RH. Each climate step shall last for 1 week, the
47、test shall start with a climate (20 2) C and (85 5) % RH. Table 1 Cyclic stepped climate for the bending test Climate step No. Temperature C Relative humidity % Duration of climate step h 1 (20 2) (85 5) 168 2 (45 2) (40 5) 168 The use of other climatic conditions for the test are acceptable, if it
48、is shown that these climatic conditions lead to comparable results as those defined in Table 1. The mid-span deflection of each bending specimen shall be recorded at the bending tension edge in the middle of the width of the test piece. The employed dial gauges shall enable readings to 0,01 mm. The
49、initial deflection shall be recorded 1 min after the loading of each sample and subsequently at least once every week at the end of each climate step. The loading shall be sustained for at least 26 weeks. If the specified ratio of relative creep requirement given in !EN 15425“ or in relevant standards is fulfilled, the test is completed. In case the specified ratio of relative creep requirement, given in !EN 15425“ or in relevant standards, is not met, the lo