1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 302-5:2013Adhesives for load-bearingstructures Test methodsPart 5: Determination of maximumassembly time under referenced conditionsBS EN 302-5:2013 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of EN 302-5:2013. It supersedes DD ENV 302-5:2002, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e P R I / 5 2 , A d h e s i v e s .A list of organizations represented on this com
3、mittee 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. The British Standards Institution 2013. Published by BSI Standards Limited 2013.ISBN 978 0 580 75261 2 ICS 83
4、.180 Compliance with a British Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 302-5:2013EUROPEAN STANDAR
5、D NORME EUROPENNE EUROPISCHE NORM EN 302-5 March 2013 ICS 83.180 Supersedes ENV 302-5:2001English Version Adhesives for load-bearing structures - Test methods - Part 5: Determination of maximum assembly time under referenced conditions Adhsifs pour structures portantes en bois - Mthodes dessai - Par
6、tie 5: Dtermination du temps dassemblage maximal dans des conditions de rfrence Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 5: Bestimmung der maximalen Wartezeit bei Referenzbedingungen This European Standard was approved by CEN on 5 February 2013. CEN members are bound to comply with
7、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 application to the CEN-CENELEC Managem
8、ent 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 Management Centre has the same statu
9、s 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, Lithuania, Luxembourg, Malta,
10、 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 Brussels 2013 CEN All rights of
11、 exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 302-5:2013: EBS EN 302-5:2013EN 302-5:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 6 2 Normative references 6 3 Terms and definitions .6 4 Principle 6 5 Apparatus .6 6 Procedure .7 6.1
12、General 7 6.1.1 Selection of timber.7 6.1.2 Preparation of the bonded members .7 6.1.3 Glue spread level .7 6.2 Screening test 7 6.2.1 General 7 6.2.2 Adhesive application .7 6.2.3 Lay-up .7 6.2.4 Pressing time .8 6.2.5 Conditioning .8 6.2.6 Procedure and evaluation of the screening test 8 6.3 Final
13、 test .8 6.3.1 General 8 6.3.2 Pressing time .8 6.3.3 Conditioning .8 6.4 Delamination test procedures 9 6.4.1 Preparation of the test pieces 9 6.4.2 Testing for delamination .9 6.5 Measurement and evaluation of delamination 9 7 Expression of results 9 8 Requirement 10 8.1 Screening test . 10 8.2 Fi
14、nal test 10 9 Test report . 10 BS EN 302-5:2013EN 302-5:2013 (E) 3 Foreword This document (EN 302-5:2013) 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 pub
15、lication of an identical text or by endorsement, at the latest by September 2013 and conflicting national standards shall be withdrawn at the latest 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 CEN
16、ELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes ENV 302-5:2001. The following modifications have been made: The principle for the determination of maximum assembly time has been totally altered; The rolling ball method has been exchanged by
17、test pieces similar to EN 3022. 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, Former Yugoslav Re
18、public of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 302-5:2013EN 302-5:2013 (E) 4 Introduction This d
19、ocument 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 consists of three classification and performance requirements for adhesives for load-bearing timber structures; phenolic and a
20、minoplastic adhesives (EN 301), one component polyurethane adhesive (EN 15425) and emulsion polymerized isocyanate adhesive (prEN 16254) and all together eleven test methods (EN 302 Parts 1 to 7 and EN 15416 Parts 2 to 5). These European Standards have the following titles: EN 301, Adhesives, phenol
21、ic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 15425, Adhesives One component polyurethane for load bearing timber structures Classification and performance requirements prEN 16254, Adhesives Emulsion polymerized isocyanate (EPI) for load-beari
22、ng 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 wo
23、od 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
24、 conditions Part 7: Determination of the working life under referenced conditions EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 2: Static load test of multiple bondline specimens in compression shear Part 3: Creep deformation test at cy
25、clic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly time for one component polyurethane adhesives Part 5: Determination of conventional pressing time Safety statement Persons using this document should be familiar with the normal laboratory practice,
26、 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 safety and health practices and to ensure compliance with any regulatory conditions. BS EN 302-5:2013EN 302-5:2013 (E) 5 Environment
27、al 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 alternatives for these materials, they will be eliminated from this standard to the greatest extent possible. At the end of the test
28、, it is recommended that the user of the standard take care to carry out an appropriate disposal of the wastes, according to local regulations. BS EN 302-5:2013EN 302-5:2013 (E) 6 1 Scope This European Standard specifies a laboratory method of determining the maximum assembly time at two spread rate
29、 levels in standard atmosphere 20/65. This European Standard is intended for obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions. 2 Normative references The following documents, in whole or in part, are normatively referenced in this docume
30、nt 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, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classificatio
31、n and performance requirements EN 302-2:2013, Adhesives for load-bearing timber structures Test methods Part 2: Determination of resistance to delamination EN 923:2005+A1:2008, Adhesives Terms and definitions 3 Terms and definitions For the purposes of this document, the terms and definitions given
32、in EN 923:2005+A1:2008 and the following apply. 3.1 assembly time time interval under specified conditions from spread of adhesive on the lamellae until the cramping pressure is applied 3.2 maximum assembly time time interval after which an adhesive coat loses its bonding ability 4 Principle Delamin
33、ation test pieces similar to EN 302-2 are produced with different assembly times for individual bond lines by using 5 mm spacers in the corners. A delamination test is performed to evaluate the maximum assembly time at which the highest allowed delamination value is exceeded. 5 Apparatus 5.1 Autocla
34、ve or similar pressure vessel, as described in EN 302-2. 5.2 Vacuum pump or similar device, as described in EN 302-2. 5.3 Pump or similar device, as described in EN 302-2. 5.4 Air-circulating oven(s) or chamber(s), as described in EN 302-2. BS EN 302-5:2013EN 302-5:2013 (E) 7 5.5 Balance, as describ
35、ed in EN 302-2. 5.6 Wood chisel and hammer,or similar devices capable of opening the glue lines. 5.7 Spacers, made of wood or hard plastic with a thickness of 5 mm. 6 Procedure 6.1 General NOTE This test method has two stages: screening test (6.2) and final test (6.3). 6.1.1 Selection of timber Make
36、 laminated members out of flat-sawn, straight-grained Norway spruce (Picea abies L.), free of reaction wood, with a density of (450 25) kg/m at 12 % moisture content. Preferably, knot-free wood should be used, but allowances are made for boards with knots up to a maximum of 15 mm in diameter, but sp
37、lay (spike) knot is not allowed. Condition the timber in the standard climate (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) %. 6.1.2 Preparation of the bonded members For each laminated member, prepare si
38、x lamellae (150 5) mm wide, (30 1) mm thick and approximately 500 mm long. The desired thickness is achieved by planing 38 mm thick lamellae. Bond the lamellae within 8 h of planing. Within each laminated member assembly, ensure that the six lamellae present the same growth ring orientation. The ass
39、embly is produced in climate (20 1) C and (65 2) % relative humidity. A strict climate control is very important as small changes in air temperature and relative humidity will highly influence the drying tendency of the applied adhesive and thus influence the maximum assembly time. The circulation o
40、f air should be as low as possible. 6.1.3 Glue spread level The assembly time is determined with two levels of glue spread: 250 g/m and 400 g/m. 6.2 Screening test 6.2.1 General For each level of glue spread (6.1.3) make one laminated member of six lamellae giving five glue lines with different asse
41、mbly time for each glue line. 6.2.2 Adhesive application Apply the adhesive on one side of the lamellae in accordance with the adhesive manufacturers recommendation, as a glue mix or as separate spread of adhesive and hardener by using a ribbon spreader. 6.2.3 Lay-up Start to apply the adhesive on t
42、he top surface of the lamellae number 2. After 2 min open assembly time, place 5 mm thick spacers in each corner and cover the glue line by placing lamellae number 1 on top of lamellae number 2. BS EN 302-5:2013EN 302-5:2013 (E) 8 Then continue to apply the adhesive on the top surface of lamellae nu
43、mber 3. After 2 min open assembly time, add 5 mm spacers in each corner and cover the glue line with the assembly consisting of lamellae number 1 and number 2. Continue the same procedure with lamellae number 4, 5 and 6. If the expected assembly time is 30 min then use 5 min intervals between the gl
44、ue lines; for expected assembly time 30 min to 60 min, use 10 min intervals; and for expected assembly time 60 min, use 15 min intervals. EXAMPLE If the expected assembly time is 50 min, then start with 30 min assembly time and continue with 40 min, 50 min, 60 min and end with 70 min assembly time.
45、6.2.4 Pressing time After the elapsed time of the assembly times, remove the spacers from the corners and press the laminated member at (20 2) C and (65 5) % relative humidity with a pressure of 0,6 N/mm. The pressing time shall be as recommended by the adhesive manufacturer. 6.2.5 Conditioning Afte
46、r bonding and pressing, but before cutting and testing, condition the assembly for 7 days at (20 2) C and (65 5) % relative humidity. A longer or shorter conditioning time may be used if recommended by the adhesive manufacturer. 6.2.6 Procedure and evaluation of the screening test Prepare the test p
47、ieces and follow the test procedure as described in 6.4. If the first screening test does not give a clear indication of the maximum assembly time, all glue lines pass the requirement (delamination less than 4 %). If none of the glue lines pass the requirement or the time intervals for the assembly
48、time between glue lines is too long or too short, then make a second screening test with more appropriate time settings. When the screening test result of two of the three test pieces can be concluded to indicate the maximum assembly time, then make the final test. 6.3 Final test 6.3.1 General For e
49、ach level of glue spread (6.1.3), prepare two bonded members according to 6.1.2 with the same assembly time for all glue lines, as determined from the screening test result (6.2.6), and carry out the test according to 6.4. 6.3.2 Pressing time After the assembly time has been reached, remove the spacers from the corners and press the laminated member at (20 2) C and (65 5) % relative humidity with a pressure of 0,6 N/mm. The pressing time shall be as recommended by the adhesive man
