1、May 2017 English price group 10No 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 83.180!%eBe“2663166www.din.deDIN EN
2、302-8Adhesives for loadbearing timber structures Test methods Part 8: Static load test of multiple bond line specimens in compression shear;English version EN 3028:2017,English translation of DIN EN 302-8:2017-05Klebstoffe fr tragende Holzbauteile Prfverfahren Teil 8: Statische Belastungsprfung an P
3、rfkrpern mit mehreren Klebfugen bei DruckScherbeanspruchung;Englische Fassung EN 3028:2017,Englische bersetzung von DIN EN 302-8:2017-05Adhsifs pour structures portantes en bois Mthodes dessais Partie 8: Essai de charge statique sur des prouvettes joints mulitples en cisaillement par compression;Ver
4、sion anglaise EN 3028:2017,Traduction anglaise de DIN EN 302-8:2017-05SupersedesDIN EN 154162:200803www.beuth.deDocument comprises 17 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.05.17 DIN EN 302-8:2017-05 2 A comma is used
5、as the decimal marker. National foreword This document (EN 302-8:2015) has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretariat: UNE, Spain). The responsible German body involved in its preparation was DIN-Normenausschuss Holzwirtschaft und Mbel (DIN Standards Committee Timber an
6、d Furniture), Working Committee NA 042-04-05 AA “Mirror committee for CEN/TC 193/SC 1 wood adhesives”. Amendments This standard differs from DIN EN 15416-2:2008-03 as follows: a) the title of the standard has been modified; b) EN 301 and EN 16254 have been included in the Scope; c) in Table 1, (50 2
7、) C and (90 2) C for climate cycle 1 have been included with reference to EN 15425 for polyurethane adhesives; d) the content has been brought in line with the standard series DIN EN 302; e) new drawings of the test jig with some adjusted part dimensions have been included. Previous editions DIN EN
8、15416-2: 2008-03 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 302-8 January 2017 ICS 83.180 Supersedes EN 15416-2:2007English Version Adhesives for load-bearing timber structures - Test methods - Part 8: Static load test of multiple bond line specimens in compression shear Adhsifs pour struc
9、tures portantes en bois - Mthodes dessais - Partie 8 : Essai de charge statique sur des prouvettes joints multiples en cisaillement par compression Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 8: Statische Belastungsprfung an Prfkrpern mit mehreren Klebfugen bei Druck-Scherbeanspruchung
10、 This European Standard was approved by CEN on 30 October 2016. 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 bibliographical re
11、ferences concerning such national standards may be obtained on application to the CEN-CENELEC 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
12、CEN member into its own language and notified to the CEN-CENELEC 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, Former Yugoslav Republic of Macedo
13、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATI
14、ON EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 302-8:2017 EEN 302-8:2017 (E) 2 Contents Page European foreword . 3 Introductio
15、n 5 1 Scope 6 2 Normative references 6 3 Principle . 6 4 Apparatus . 6 4.1 Test jig . 6 4.2 Equipment for climate control . 9 4.3 Testing machine 9 5 Test specimens . 9 5.1 Selection of wood 9 5.2 Preparation of laminations . 9 5.3 Preparation of test specimens . 12 6 Test procedure 12 6.1 Applicati
16、on of load . 12 6.2 Test climates 13 6.3 Measurements and evaluation of result 13 7 Test report 13 Bibliography . 15 DIN EN 302-8:2017-053 European foreword This document (EN 302-8:2017) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by UNE. This Eu
17、ropean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. Attention is drawn to the possibility that some of the element
18、s of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 15416-2:2007. Compared to EN 15416-2:2007, the following modifications have been made: a) title has been changed; b) EN 301 and EN 1625
19、4 are included in the scope; c) introduction of (50 2) C and (90 2) C in Table 1, climate 1, with reference to EN 15425; d) layout has been made in line with EN 302-1:2013 to EN 302-7:2013; e) new drawings of the test jig with some adjusted part dimensions are included. This document is one of a pac
20、kage dealing with adhesives for use with timber structures, and is published in support to EN 1995, Eurocode 5: Design of timber structures (all parts). The package consists of three classification and performance requirements for adhesives for load-bearing timber structures; phenolic and aminoplast
21、ic adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerized isocyanate adhesives (EN 16254), and twelve test methods (EN 302 parts 1 to 8, EN 15416 parts 1, 3, 4 and 5). These European Standards have the following titles: EN 301, Adhesives, phenolic and aminoplast
22、ic, for load-bearing timber structures Classification and performance requirements EN 15425, Adhesives One component polyurethane (PUR) for load-bearing timber structures - Classification and performance requirements EN 16254, Adhesives Emulsion polymerized isocyanate (EPI) for load-bearing timber s
23、tructures Classification and performance requirements EN 302-1, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength EN 302-2, Adhesives for load-bearing timber structures Test methods Part 2: Determination of resistance to delaminati
24、on EN 302-8:2017 (E) DIN EN 302-8:2017-054 EN 302-3, Adhesives for load-bearing timber structures Test methods Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength EN 302-4, Adhesives for load-bearing timber structur
25、es Test methods Part 4: Determination of the effects of wood shrinkage on the shear strength EN 302-5, Adhesives for load-bearing timber structures Test methods Part 5: Determination of maximum assembly time under referenced conditions EN 302-6, Adhesives for load-bearing timber structures Test meth
26、ods Part 6: Determination of the minimum pressing time under referenced conditions EN 302-7, Adhesives for load-bearing timber structures Test methods Part 7: Determination of the working life under referenced conditions EN 302-8, Adhesives for load-bearing timber structures Test methods Part 8: Sta
27、tic load test of multiple bond line specimens in compression shear EN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 1: Long-term tension load test perpendicular to the bond line at varying climate conditions with specimens perpendicular
28、to the glue line (Glass house test) EN 15416-3, 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 EN 15416-4, Adhesives for load bearing timber structures o
29、ther than phenolic and aminoplastic Test methods Part 4: Determination of open assembly time under referenced conditions EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 5: Determination of minimum pressing time under referenced conditio
30、ns According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
31、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 302-8:2017 (E) DIN EN 302-8:2017-055 Introduction Safety statement Person
32、s using this European Standard should be familiar with the normal laboratory practice, if applicable. This European Standard cannot 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 en
33、sure compliance with any regulatory conditions. Environmental statement It is understood that some of the material permitted in this European Standard may have negative environmental impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from thi
34、s European Standard to the extent possible. At the end of the test, it is recommended that the user of this European Standard take care to carry out an appropriate disposal of the wastes, according to local regulation. EN 302-8:2017 (E) DIN EN 302-8:2017-056 1 Scope This European Standard specifies
35、a method of determining the ability of adhesive bonds to resist static load. 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 EN 301, EN 15425 and EN 16254; b) for assessing
36、the suitability and quality of adhesives for load-bearing timber structures; c) for assessing the effect on the bond strength resulting from constant load at different climate conditions. This method is intended primarily to obtain performance data for the classification of adhesives for load bearin
37、g timber structures according to their suitability for use in defined climatic environments. This method is not intended to provide data for structural design, and does not necessarily represent the performance of the bonded member in service. 2 Normative references The following documents, in whole
38、 or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 301:2013, Adhesives, phenolic and ami
39、noplastic, for load-bearing timber structures Classification and performance requirements EN 15425:2017, Adhesives One component polyurethane (PUR) for load-bearing timber structures Classification and performance requirements EN 16254:2013+A1:2016, Adhesives Emulsion polymerized isocyanate (EPI) fo
40、r load-bearing timber structures Classification and performance requirements 3 Principle Bonded test pieces are subjected to a constant compression shear load under a series of three different climates. Number of failures and the amount of deformation is measured after the end of the last climate cy
41、cle. 4 Apparatus 4.1 Test jig The test Equipment is shown in Figure 1 and Figure 2. EN 302-8:2017 (E) DIN EN 302-8:2017-057 Dimensions in millimetres Key 1 top plate 2 spacer plate 3 base plate 4 tension rod 5 centre rod Figure 1 Test jig EN 302-8:2017 (E)DIN EN 302-8:2017-058 Dimensions in millimet
42、res Key 1 top plate 3 base plate 2 spacer plate 4 tension rod (the given lengths are minimum values) 5 centre rod. (the given length is a minimum value) Figure 2 Dimensions of plates and rods EN 302-8:2017 (E) DIN EN 302-8:2017-059 If longer rods are used, distance blocks need to be placed on top an
43、d/or under the specimen. The distance blocks shall be prepared in such a way that the two contact surfaces, between the distance block and the jig and between the distance block and the specimen, are parallel. Dimension of distance blocks: at least 48 mm 51 mm 10 mm. NOTE Blocks produced from severa
44、l pieces of plywood bonded together have been found suitable The spring shall have the following characteristics: outside diameter (unloaded): 105 mm; end fix: both ends fixed and grounded ; free length: 320 mm; compression at maximum load: 45 mm to 50 mm. NOTE A spring rate of 81 N/mm has shown to
45、be suitable. 4.2 Equipment for climate control The used equipment shall be capable of maintaining (50 2) C, (70 2) C or (90 2) C with a relative humidity of (10 5) % in order to reach one of the climate conditions 1 a), 1 b) or 1 c) in Table 1, and the two climates (20 2) C and (85 5) % relative hum
46、idity and (50 2) C and (75 5) % relative humidity. 4.3 Testing machine A testing machine capable to apply a compression load is required. 5 Test specimens 5.1 Selection of wood Untreated beech wood (Fagus sylvatica L.) with a density of (700 50) kg/m3at 12 % moisture content shall be used. The mater
47、ial shall be straight-grained and free from knots, 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. The angle of the annual rings to the surface to be bond
48、ed shall be between 30 and 60. 5.2 Preparation of laminations Condition the wood at (20 2) C and (65 5) % relative humidity (hereafter climate 20/65 until a moisture content of (12 1) % has been obtained. Plane each lamination not more than 4 h before applying the test adhesive. The parts, of which
49、the specimen is built of, shall have the same direction for the annual rings in the cross section (according to Figure 3). EN 302-8:2017 (E) N1)N1)National footnote: Here, it reads “grounded” instead of “ground”. This has been corrected in the German version. DIN EN 302-8:2017-0510 Figure 3 Orientation of an
