DIN EN 302-4-2013 Adhesives for load-bearing timber structures - Test methods - Part 4 Determination of the effects of wood shrinkage on the shear strength German version EN 302-4 .pdf

1、June 2013 Translation by DIN-Sprachendienst.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 8

2、3.180!%3v“2021683www.din.deDDIN EN 302-4Adhesives for load-bearing timber structures Test methods Part 4: Determination of the effects of wood shrinkage on the shearstrength;English version EN 302-4:2013,English translation of DIN EN 302-4:2013-06Klebstoffe fr tragende Holzbauteile Prfverfahren Teil

3、 4: Bestimmung des Einflusses von Holzschwindung auf die Scherfestigkeit;Englische Fassung EN 302-4:2013,Englische bersetzung von DIN EN 302-4:2013-06Adhsifs pour structures portantes en bois Mthodes dessai Partie 4: Dtermination de linfluence du retrait du bois sur la rsistance au cisaillement;Vers

4、ion anglaise EN 302-4:2013,Traduction anglaise de DIN EN 302-4:2013-06SupersedesDIN EN 302-4:2004-10www.beuth.deDocument comprises 16 pagesIn case of doubt, the German-language original shall be considered authoritative.06.13DIN EN 302-4:2013-06 2 A comma is used as the decimal marker. National fore

5、word This document (EN 302-4:2013) has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretariat: AENOR, Spain). The responsible German body involved in its preparation was the Normenausschuss Holzwirtschaft und Mbel (Timber and Furniture Standards Committee), Working Committee NA 042

6、-04-05 AA Spiegelausschuss zu CEN/TC 193/SC 1 Holzklebung. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 6344-2 DIN ISO 6344-2 Amendments This standard differs from DIN EN 302-4:2004-10 as follows: a) in Subclause 4.2 “Climatic cabinets”

7、, the determination of the air speed has been rendered more precise; b) in Subclause 5.1.1 “Selection of timber”, the density of the Norway spruce has been changed from (425 25) kg/m3to (450 25) kg/m3; c) in Subclause 5.4 “Dry storage treatment”, the tolerance of the air speed has been increased and

8、 a recommended drying period has been included. Previous editions DIN 68141: 1969-10 DIN EN 302-4: 1992-08, 2004-10 National Annex NA (informative) Bibliography DIN ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P 12 to P 220 EUROPEAN

9、STANDARD NORME EUROPENNE EUROPISCHE NORM EN 302-4 March 2013 ICS 83.180 Supersedes EN 302-4:2004English Version Adhesives for load-bearing timber structures - Test methods - Part 4: Determination of the effects of wood shrinkage on the shear strength Adhsifs pour structures portantes en bois - Mthod

10、es dessai - Partie 4: Dtermination de linfluence du retrait du bois sur la rsistance au cisaillement Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 4: Bestimmung des Einflusses von Holzschwindung auf die Scherfestigkeit This European Standard was approved by CEN on 5 February 2013. CEN me

11、mbers 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 references concerning such national standards may be obtained on applica

12、tion 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 CEN member into its own language and notified to the CEN-CENELEC Manag

13、ement 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 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia

14、, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000

15、Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 302-4:2013: EEN 302-4:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 6 2 Normative references 6 3 Principle 6 4 Apparatus .6 5 Method 7 5.1 General 7 5.1.1

16、Selection of timber.7 5.1.2 Preparation of cover pieces 7 5.1.3 Preparation of core pieces 7 5.1.4 Conditioning .8 5.2 Preparation of the bonded assemblies8 5.3 Number of bonded assemblies . 11 5.4 Dry storage treatment 11 5.5 Preparation of the test piece . 11 5.6 Climatic storage 12 5.7 Test proce

17、dure 12 6 Expression of results . 12 7 Test report . 13 7.1 The adhesive . 13 7.2 Preparation of the samples and the testing procedures 13 7.3 Test results 13 Bibliography . 14 DIN EN 302-4:2013-06 EN 302-4:2013 (E) 3 Foreword This document (EN 302-4:2013) has been prepared by Technical Committee CE

18、N/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 September 2013 and conflicting national standards shall be withdrawn at the latest

19、by September 2013. 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. This document supersedes EN 302-4:2004. The following modifications

20、 have been made: The wood density requirement for Norwegian spruce has been altered; A recommended time period is given for the dry storage treatment. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe

21、an Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slove

22、nia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 302-4:2013-06 EN 302-4:2013 (E) 4 Introduction This document is one of a series dealing with adhesives for use with timber structures, and is published in support of EN 1995, Eurocode 5: Design of timber structures. The series co

23、nsists of three classification and performance requirements for adhesives for load-bearing timber structures, phenolic and aminoplastic adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerised isocyanate adhesives (prEN 16254), and all together eleven test methods

24、 (EN 302 Parts 1 to 7 and EN 15416 Parts 2 to 5). These European Standards have the following titles: EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 15425, Adhesives One component polyurethane for load bearing timber st

25、ructures Classification and performance requirements prEN 16254, Adhesives Emulsion polymerized isocyanate (EPI) for load-bearing timber structures Classification and performance requirements EN 302, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tens

26、ile shear strength Part 2: Determination of resistance to delamination Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength Part 4: Determination of the effects of wood shrinkage on the shear strength Part 5: Determi

27、nation of maximum assembly time under referenced conditions Part 6: Determination of the minimum pressing time under referenced conditions Part 7: Determination of the working life under referenced conditions EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic

28、 Test methods Part 2: Static load test of multiple bondline specimens in compression shear Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly time for one component polyurethane adhesives Part 5: Determination of

29、conventional pressing time Safety statement Persons using this document should be familiar with the normal laboratory practice, if applicable. This document cannot address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safet

30、y and health practices and to ensure compliance with any regulatory conditions. DIN EN 302-4:2013-06 EN 302-4:2013 (E) 5 Environmental statement It is understood that some of the material permitted in this standard can have a negative environmental impact. As technological advantages lead to better

31、alternatives for these materials, they will be eliminated from this standard to the greatest extent possible. At the end of the test, it is recommended that the user of the standard take care to carry out an appropriate disposal of the wastes, according to local regulations. DIN EN 302-4:2013-06 EN

32、302-4:2013 (E) 6 1 Scope This European Standard specifies a method for determining the influence of shear strength in crosswise gluing by wood shrinkage under drying conditions. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and prEN

33、 16254; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for determining if the adhesive is capable of withstanding stresses due to wood shrinkage without unacceptable loss of strength. This test is intended primarily to obtain performance data for the

34、 classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.). This method is not intended for use to provide numerical design data and does not necessarily represent

35、 the performance of the bonded member in service. 2 Normative references The following documents, in whole 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 editi

36、on of the referenced document (including any amendments) applies. EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 13183-1, Moisture content of a piece of sawn timber Part 1: Determination by oven dry method ISO 5893, Rub

37、ber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220 3 Principle A crosswise double joint with 0,5 mm thick glue li

38、ne is submitted to a dry storage treatment and then strained to failure by a compressive shear force. 4 Apparatus 4.1 Testing machine, which shall be either: a) capable of maintaining a constant rate of loading of (20 5) kN/min; or b) capable of maintaining a constant crosshead speed as described in

39、 ISO 5893. DIN EN 302-4:2013-06 EN 302-4:2013 (E) 7 4.2 Climatic cabinets, which shall be capable of maintaining the bonded assemblies under the following conditions: a) (40 2) C and a relative humidity of (30 2) % and an air speed of (0,7 0,15) m/s measured in the centre of an empty cabinet; b) (20

40、 2) C and a relative humidity of (65 5) %; c) (20 2) C and a relative humidity of (75 to 80) %. 5 Method 5.1 General 5.1.1 Selection of timber Use Norway spruce (Picea abies L.) having a density of (450 25) kg/m measured at 12 % moisture content as determined by oven drying (according to EN 13183-1)

41、. 5.1.2 Preparation of cover pieces From three boards with a length of at least 1 200 mm, prepare three pairs of solid Norway spruce cover pieces that are knot-free, straight grained with growth rings that are approximately tangential to the face and have a radius of 60 mm to 140 mm. The cover piece

42、s shall be a) 400 mm in length, b) 140 mm in width, and c) (20 0,5) mm in thickness after conditioning, measurement of moisture content (oven dry method according to EN 13183-1) and final preparation. Each matching pair of cover pieces is intended for the production of a specimen. 5.1.3 Preparation

43、of core pieces Prepare three laminated spruce core pieces that are knot-free, straight-grained and with annual rings at an angle of 35 to 55 relative to the surface (see Figure 1). The dimensions of the core pieces shall be a) 400 mm in length, b) 140 mm in width, and c) (40,0 0,5) mm in thickness a

44、fter conditioning, measurement of moisture content (oven dry method according to EN 13183-1) and final preparation. These laminated core pieces shall be produced of two boards with a width of (75 2) mm, and a thickness of at least 48 mm. The two boards shall be bonded together longitudinally with a

45、phenol-resorcinol-formaldehyde adhesive which passed EN 301 (used according to the adhesive manufacturers instructions), with an annual ring orientation as indicated in Figure 1. DIN EN 302-4:2013-06 EN 302-4:2013 (E) 8 Dimensions in millimetres Key 1 phenolic-resorcinol-formaldehyde (PRF) adhesive

46、glue line angle of annual line orientation to the surfaces Figure 1 Cross-section of the laminated Norway spruce core piece before planing and cutting to the required dimensions of 140 mm wide by (40,0 0,5) mm thick 5.1.4 Conditioning Condition the core and cover pieces such that the average moistur

47、e content of all three pieces used in an assembly is (17,5 0,5) %. Individual core and cover pieces may have a moisture content of (17 1) %, as determined by the oven-dry method, according to EN 13183-1. NOTE Storage at (20 2) C and 75 % to 80 % relative humidity would be expected to give rise to a

48、moisture content in the wood of between 16 % and 18 %. Not more than 8 h before bonding, either lightly plane or lightly sand, using a grade P100 abrasive paper as defined in ISO 6344-2, each surface to be bonded. Remove any dust carefully. Do not touch or soil the prepared surface. 5.2 Preparation

49、of the bonded assemblies Before bonding the specimens together, take a sample from each of the core and cover pieces for the wood moisture content determination, using the oven-dry method, according to EN 13183-1. Calculate and record each specimens mean moisture content using the following formula: Um= 42 321 UUU +where Umis the specimens mean moisture content in percent; U1is the moisture content of the first cover piece in percent; U2is the moistu