EN 302-2-2017 en Adhesives for load-bearing timber structures - Test methods - Part 2 Determination of resistance to delamination.pdf

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1、Adhesives for load-bearing timber structures - Test methodsPart 2: Determination of resistance to delaminationBS EN 3022:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 302-2 September 2017 ICS 83.180 Supersede

2、s EN 302-2:2013English Version Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination Adhsifs pour structures portantes en bois - Mthodes dessais - Partie 2 : Dtermination de la rsistance la dlamination Klebstoffe fr tragende Holzbauteile -

3、Prfverfahren - Teil 2: Bestimmung der DelaminierungsbestndigkeitThis European Standard was approved by CEN on 9 July 2017. 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 with

4、out any alteration. Up-to-date lists and bibliographical references 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

5、language made by translation under the responsibility of a 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, De

6、nmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, 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

7、 COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION 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 302-2:2017 ENational

8、 forewordThis British Standard is the UK implementation of EN 3022:2017. It supersedes BS EN 3022:2013, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on this committee can be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 t

9、o its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 90756 2ICS 83.180Compliance with a British Standard

10、 cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 3022:2017EUROPEAN STANDARD NORME EUROPENNE

11、EUROPISCHE NORM EN 302-2 September 2017 ICS 83.180 Supersedes EN 302-2:2013English Version Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination Adhsifs pour structures portantes en bois - Mthodes dessais - Partie 2 : Dtermination de la rsi

12、stance la dlamination Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 2: Bestimmung der DelaminierungsbestndigkeitThis European Standard was approved by CEN on 9 July 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t

13、his 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 application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official

14、 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Aus

15、tria, 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, Serbia, Slovakia, Slovenia, Spa

16、in, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION 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 worldwid

17、e for CEN national Members. Ref. No. EN 302-2:2017 EBS EN 3022:2017EN 302-2:2017 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 6 2 Normative references 6 3 Principle . 6 4 Apparatus . 6 5 Method 7 5.1 Selection of timber 7 5.2 Preparation of the bonded members . 7 5.2.1 Bonded mem

18、bers with thin glue lines . 7 5.2.2 Bonded members with 2 mm glue lines 8 5.3 Preparation of test pieces 9 5.3.1 Bonded members with thin glue lines . 9 5.3.2 Bonded members with 2 mm glue lines 9 5.4 Test procedures . 9 5.4.1 General 9 5.4.2 nulHigh temperature procedure (for type I adhesives) . 9

19、5.4.3 Low temperature procedure (for type II adhesives) . 10 5.5 Measurement and evaluation of delamination . 11 6 Expression of results . 12 7 Test report 12 7.1 The adhesives 12 7.2 Preparation of test pieces and testing procedure 13 7.3 Test results . 13 Bibliography . 14 BS EN 3022:2017EN 302-2:

20、2017 (E) 3 European foreword This document (EN 302-2:2017) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by UNE. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,

21、at the latest by March 2018, and conflicting national standards shall be withdrawn at the latest by March 2018. 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 o

22、r all such patent rights. This document supersedes EN 302-2:2013. Compared to EN 302-2:2013 the following modifications have been made: a) EN 15416-2 is replaced by EN 302-8, Adhesives for load-bearing timber structures Test methods Part 8: Static load test of multiple bond line specimens in compres

23、sion shear; b) preparation of bonded members with 2 mm glue line thickness added as 5.2.2; c) preparation of test pieces with 2 mm glue line thickness added as 5.3.2; d) drying conditions for hardwood species included in 5.4.3. According to the CEN-CENELEC Internal Regulations, the national standard

24、s 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem

25、bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3022:2017EN 302-2:2017 (E) 4 Introduction This document is one of a series dealing with adhesives for use with timber structures, and is publishe

26、d in support of EN, 1995 Eurocode 5: Design of timber structures. The series consists 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 poly

27、merised isocyanate adhesives (EN 16254), and all together twelve test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-5, EN 302-6, EN 302-7 and EN 302-8 and EN 15416-1, EN 15416-3, EN 15416-4 and EN 15416-5). These European Standards have the following titles: EN 301, Adhesives, phenolic and

28、 aminoplastic, 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-bearin

29、g timber structures Classification and performance requirements EN 302, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength Part 2: Determination of resistance to delamination Part 3: Determination of the effect of acid damage to woo

30、d 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: Determination of maximum assembly time under referenced conditions Part 6: Determination of the minimum pressing time under referenced

31、conditions Part 7: Determination of the working life under referenced conditions Part 8: Static load test of multiple bond line specimens in compression shear EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 1: Long-term tension load test

32、perpendicular to the bond line at varying climate conditions with specimens loaded perpendicular to the glue line (Glasshouse test) Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly time under referenced conditio

33、ns Part 5: Determination of minimum pressing time under referenced conditions. BS EN 3022:2017EN 302-2:2017 (E) 5 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, assoc

34、iated 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 that some of the material permitted in this standard can have a negative environmental impac

35、t. As technological advantages lead to better 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

36、to local regulations. BS EN 3022:2017EN 302-2:2017 (E) 6 1 Scope This European Standard specifies a method for determining the resistance to delamination in glue lines. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and EN 16254; b)

37、for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding. This

38、test is not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage properties, such as acetylated wood, heat-treated wood and polymer impregnated wood. This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing ti

39、mber 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 Not applicable. 3 Principle Bonded, l

40、aminated specimens are subjected to an impregnation-drying procedure. The specimens are impregnated with water by immersing them and applying alternating high and low (vacuum) pressure. They are then dried rapidly in a specified air stream at low humidity (see 4.4). The extent of open glue lines, de

41、lamination, as a result of these treatments is measured and compared with the total length of glue lines on both end-grain faces of the specimen. 4 Apparatus 4.1 Autoclave or similar pressure vessel, designed to safely withstand a pressure of at least 625 kPa absolute (525 kPa above nominal atmosphe

42、ric pressure). 4.2 Vacuum pump or similar device, capable of reducing the pressure in the vessel (4.1) to below 20 kPa absolute (80 kPa below nominal atmospheric pressure). 4.3 Pump or similar device, for obtaining a pressure of at least 600 kPa absolute (500 kPa above nominal atmospheric pressure).

43、 4.4 Air-circulating oven(s) or chamber(s), capable of drying the test pieces (see 5.4) in the following climate condition: a) for low temperature procedure (type II adhesive) a temperature of (27,5 2,5) C, circulating the air within the chamber, maintaining a constant relative humidity of (30 5) %

44、and b) for high temperature procedure (type I adhesive) a temperature of (65 3) C, circulating the air within the chamber, maintaining a relative humidity of (12,5 2,5) %. BS EN 3022:2017EN 302-2:2017 (E) 7 NOTE Air speed velocity of 2 m/s to 3 m/s in empty chamber has shown to be suitable to achiev

45、e drying times according to 5.4.2 and 5.4.3. 4.5 Balance, allowing measurements with an accuracy of 1 g. 4.6 Wood chisel and hammer, or similar devices capable of opening the glue lines. 5 Method 5.1 Selection of timber Use flat-sawn, straight-grained Norway spruce (Picea abies L.), free of reaction

46、 wood, with a density of (450 25) kg/3mat (12 1) % moisture content. Preferably, knot-free wood should be used, but allowances are made for boards with knots up to a maximum of 20 mm in diameter, but splay (spike) knot is not allowed. The test with Norway spruce also covers approval of silver fir (A

47、bies alba) and Scots pine (Pinus sylvestris). If the adhesive is to be used on wood from other conifer species like larch (Larix decidua), Douglas fir (Pseudotsuga menziesii) and pines with coloured heartwood (other than Scots pine (Pinus sylvestris), from hardwood species and/or on preservative tre

48、ated wood, also prepare four laminated members using representative samples using wood with mean density. Condition the timber in the standard climate 20/65 (20 2) C and a relative humidity of (65 5) %) for at least 7 days prior to bonding, ensuring that the timber has a moisture content of (12 1) %

49、. 5.2 Preparation of the bonded members 5.2.1 Bonded members with thin glue lines Make four laminated members, two with short assembly time and two with long assembly time. For each laminated member, prepare six lamellae at least (150 5) mm wide, (30 1) mm thick and approximately 500 mm long from six different boards. The desired thickness is achieved by planing 38 mm thick lamellae. Store the lamellae in standard climate 20/65 before planing and gluing. Bond the lamel