EN 15416-4-2006 3778 Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 4 Determination of open assembly time for one component.pdf

1、BRITISH STANDARDBS EN 15416-4:2006Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 4: Determination of open assembly time for one component polyurethane adhesivesThe European Standard EN 15416-4:2006 has the status of a British StandardICS 83.180g49

2、g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIBS EN 15416-

3、4:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006ISBN 0 580 48465 3National forewordThis British Standard was published by BSI. It is the UK implementation of EN 15416-4:2006.The UK participation in its preparat

4、ion was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on PRI/52 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.Compliance w

5、ith a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15416-4August 2006ICS 83.180Engl

6、ish VersionAdhesives for load bearing timber structures other than phenolicand aminoplastic - Test methods - Part 4: Determination of openassembly time for one component polyurethane adhesivesAdhsifs pour structures portantes en bois de type autreque phnolique et aminoplaste - Mthodes dessai - Parti

7、e4 : Dtermination du temps dassemblage ouvert pour lesadhsifs base de polyurthanne monocomposantsKlebstoffe fr tragende Holzbauteile ausgenommenPhenolharzklebstoffe und Aminoplaste - Prfverfahren -Teil 4: Bestimmung der offenen Wartezeit frEinkomponenten-Klebstoffe auf PolyurethanbasisThis European

8、Standard was approved by CEN on 18 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning s

9、uch nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language a

10、nd notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Net

11、herlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation i

12、n any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15416-4:2006: ELicensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 2 Contents Page Foreword3 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 P

13、rinciple5 5 Apparatus .5 6 Procedure .6 7 Expression of results 7 8 Test report 7 Bibliography 9 Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 3 Foreword This document (EN 15416-4:2006) has been prepared by Technical Committee CEN/TC 1

14、93 “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 February 2007, and conflicting national standards shall be withdrawn at the latest by Feb

15、ruary 2007. This document is one of a series dealing with test methods for adhesives for use in load bearing timber structures. The standard is published in support of Eurocode 5, Common unified rules for timber structures. The series consists of seven test methods to assess the performance of adhes

16、ives after specified heat and humidity treatments: EN 302-1, Adhesives for load-bearing timber structures Test methods Part 1: Determination of bond strength in longitudinal tensile shear strength; EN 302-2, Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resis

17、tance to delamination; 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 structures - Test metho

18、ds - Part 4: Determination of the effects of wood shrinkage on the shear strength; prEN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 1: Static load test of single bondline specimens in compression shear; prEN 15416-2, Adhesives for

19、load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 2: Static load test of multiple bondline specimens in compression shear; prEN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 3: Creep deformatio

20、n test at cyclic climate conditions with speciments loaded in bending shear; and two test methods to characterize the working properties of the adhesive: EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods - Part 4: Determination of open assembl

21、y time for one component polyurethane adhesives; EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods - Part 5: Determination of conventional pressing time. Requirements for the adhesives are stated in other documents, for instance requirements f

22、or one component polyurethane adhesives for load bearing timber structures are given in prEN 15425. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republ

23、ic, 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. Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:0

24、0 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 4 SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility

25、of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 5 1 Scope This document specifies a method of determining the open

26、assembly time in a standard climate. This document is intended to determine the open assembly time for one component polyurethane adhesives using a defined procedure for obtaining a reliable base for comparison of open assembly time between adhesives. The method gives a result that cannot be applied

27、 to the safe manufacture of timber structures without taking into account the influence of factors such as timber density/moisture content, factory temperature and relative air humidity. 2 Normative references The following referenced documents are indispensable for the application of this document.

28、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 301:2006, Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements EN 302-

29、1:2004, Adhesives for load bearing timber structures - Test methods - Part 1: Determination of bond strength in longitudinal tensile shear strength EN 923:2005, Adhesives Terms and definitions ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of trav

30、erse) Specification 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005 and the following apply. 3.1 open assembly time longest open assembly time (expressed as the mean of 10 individual results) that gives a tensile shear strength of at least 10

31、 N/mm in a standard climate (20 C and 65 % RH) with normal coefficient of variation and normal failure mode compared to the results obtained under optimal conditions. 4 Principle Standard beech lap joints are tested in tensile shear after various open assembly times until it is found that the shear

32、strength value is below 10 N/mm, the coefficient of variation increases considerably or the failure mode changes considerably. 5 Apparatus The testing machine shall be either: a) constant rate of loading machine capable of maintaining a rate of loading of (2,00,5) kN/min; or, b) constant rate of tra

33、verse machine as described in ISO 5893. Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 6 The jaws of the testing machine shall grip the test pieces with a wedge action, ensure self-aligning of the test piece and prevent from slippage du

34、ring loading. 6 Procedure 6.1 General Sufficient beech panels shall be prepared in accordance with EN 302-1:2004, clause 6.1 to enable 6 sets each of at least 10 test specimens with thin glue lines (0,1 mm) to be manufactured. 6.2 Preparation of bonded assemblies After conditioning to (12 1) % moist

35、ure content in the standard climate the panels shall be divided into 6 equal groups of samples, one for each of the 6 test series given in Table 1. Table 1 Time intervals for open assembly times at 20 C and 65 % RH Test series (nr) 1 2 3 4 5 6 Assembly time (min) 5 15 30 40 50 60 In case the result

36、of the test with open assembly times as given in Table 1 exceeds 60 min or the maximum open assembly time is shorter than 30 min, the open assembly time given in Table 1 shall be adjusted adequately. The adjustment shall be such that at least a total of 6 test series covering the time range between

37、minimum assembly time (test series 1) and expected maximum assembly time (test series 6) is tested. Not more than 24 h before bonding either lightly plane or lightly sand each surface to be bonded (using an abrasive paper of grain size P100 complying with FEPA-43). Remove any dust carefully. Do not

38、touch or soil the prepared surfaces. An adhesive spread of 200 g/mm2on one side only shall be used unless another amount is requested by the manufacturer. Comply with the adhesive manufacturers instructions regarding the processing conditions, including the preparation and application of the adhesiv

39、e and report them in the test report. After adhesive application, the board is open assembled in standard atmosphere (20 C and 65 % RH) from 5 min to 60 min (Table 1) before bonded together. Before pressure application, the board shall be laid together as shown in EN 302-1:2004, Figure 1, ensuring t

40、hat the matching board is used to produce the bonded assembly joint. 6.3 Preparation of samples for testing After bonding and pressing and before testing, conditioning the assembly for 7 days in the standard atmosphere (20 C and 65 % RH). The test pieces shall be cut 3 days or more after bonding. NO

41、TE A longer conditioning time may be used if recommended by the adhesive manufacturer. Cut five strips of width b = 20 mm from each bonded assembly along the grain, avoiding areas within 7,5 mm of the outside long edges of the panel (EN 302-1:2004, Figure 1). Cut these strips into test pieces with l

42、ength l1= (150 5) mm (EN 302-1:2004, Figure 2). Make flat bottomed cuts of 2,5 mm width in the bonded section across the grain so that an overlap of width l2= (10,00,1) mm is defined in the middle section. The cuts are to separate the wood layers and the adhesive layer, but they shall not go beyond

43、the adhesive layer. Before the test two pieces of each test series are used to measure the glue line thickness. Licensed Copy: Wang Bin, na, Thu Dec 14 06:01:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 15416-4:2006 (E) 7 6.4 Test procedure Test ten test pieces for each of the open assembly times

44、 given in Table 1. Results from tests in which failure occurred in the wood at values below 10 N/mm (EN 301:2006, Table 2, A1), rather than at the bond, or in which visual examination shows that the adhesive was not correctly applied, are invalid. All results, valid or invalid, shall be reported. In

45、sert the test piece symmetrically in the jaws of the testing machine so that the distance between the jaws is within the range of 50 mm to 90 mm. Grip tightly so that the specimen is aligned with its long axis parallel to the direction of the load. Apply a tensile force until the test piece fails. T

46、he tests shall be carried out at either: a) rate of load increase of (2,0 0,5) kN/min; or b) constant rate of jaw separation not exceeding 5 mm/min such that the time required to reach failure is between 30 s - 90 s. Record the load at failure in Newtons. For every tested test piece, by visual inspe

47、ction estimate and record the percentage wood failure to the nearest 10 % and the failure mode. 7 Expression of results Calculate the shear strength of every test piece according to the following formula: aFs = Where s is the shear strength in Newton per square millimetre (N/mm2) F is the load at fa

48、ilure in Newton (N) a is the area of the tested surface (200 mm2) Express the result of the test as the mean of the shear strength N/mm of the ten valid tests and the coefficient of variation of each test series. Express the wood failure as a mean of the ten valid test results. 8 Test report The fol

49、lowing information about preparation of test pieces and testing procedure shall be included in the test report: a) statement that the tests were carried out in accordance with this standard. b) date on which the tests were carried out and the date of the report. c) chemical nature and origin of the sample of adhesive tested. d) manufacturers name and batch number or other means of uniquely identifying the sample. e) details of the preparation and method of application of the adhesive including date of gluing. Licensed Copy: Wang Bi