1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23461-4 SANS 10183-4-4:2009Edition 1 EN 302-4:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Adhesives for wood Part 4-4: Test methods Deter
4、mination of the effects of wood shrinkage on the shear strength This national standard is the identical implementation of EN 302-4:2004 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 P
5、retoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 10183-4-4:2009 Edition 1 EN 302-4:2004 Edition 2 Table of changes Change No. Date Scope Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance derived from publications of the European C
6、ommittee for Standardization (CEN). National foreword This South African standard was approved by National Committee SABS SC 1010A, Adhesives for wood Adhesives for wood, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS docu
7、ment was published in November 2009. This SANS document supersedes SANS 10183:2000 (edition 1.1), in part. SANS 10183 consists of the following parts, under the general title Adhesives for wood: Part 1: Terminology and classification. Part 2: Structural applications. Part 3: Non-structural applicati
8、ons. Part 4: Test methods. SANS 10183-4, in turn, consists of the following sections: Section 1: Determination of bond strength in longitudinal tensile shear strength. Section 2: Determination of resistance to delamination. Section 3: Determination of the effect of acid damage to wood fibres by temp
9、erature and humidity cycling on the transverse tensile strength. Section 4: Determination of the effects of wood shrinkage on the shear strength. Section 5: Static load test of multiple bondline specimens in compression shear. Section 6: Determination of pH. Section 7: Resistance to creep under stat
10、ic loading for structural wood laminating adhesives used under exterior exposure conditions. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 302-4July 2004ICS 83.180 Supersedes EN 302-4:1992English versionAdhesives for load-bearing timber structures - Test methods -Part 4: Determination of the eff
11、ects of wood shrinkage on theshear strengthAdhsifs pour structures portantes en bois - Mthodesdessai - Partie 4: Dtermination de linfluence du retrait dubois sur la rsistance au cisaillementKlebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 4:Bestimmung des Einflusses von Holzschwindung auf d
12、ieScherfestigkeitThis European Standard was approved by CEN on 16 April 2004.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 biblio
13、graphical references concerning such 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 C
14、EN member into its own language and 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,
15、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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 2004 CEN All
16、rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 302-4:2004: ESANS 10183-4-4:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-4:2004 (E) 2 Contents page Foreword3 1 Scope 4 2
17、 Normative references 4 3 Principle4 4 Safety 4 5 Apparatus .5 5.1 Testing machine.5 5.2 Climatic cabinets .5 6 Method 5 6.1 Selection of timber.5 6.1.1 General5 6.1.2 Preparation of cover pieces5 6.1.3 Preparation of core pieces5 6.1.4 Conditioning.6 6.2 Preparation of the bonded assemblies7 6.3 Nu
18、mber of bonded assemblies 11 6.4 Dry storage treatment .11 6.5 Preparation of the test pieces 12 6.6 Climatic storage.12 6.7 Test procedure.13 7 Expression of results 13 8 Test report 13 8.1 The adhesive 13 8.2 Preparation of the samples and the testing procedures .13 8.3 Test results.14 Bibliograph
19、y 15 SANS 10183-4-4:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-4:2004 (E) 3 Foreword This document (EN 302-4:2004) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. Thi
20、s 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 January 2005, and conflicting national standards shall be withdrawn at the latest by January 2005. This document supersedes EN 302-4:1992. This documen
21、t is one of a series dealing with adhesives for use with timber structures, and is published in support of Eurocode No. 5 “Common unified rules for timber structures”. The series consists of a classification and performance requirements for two types of phenolic and aminoplastic adhesives for use in
22、 different climatic conditions (EN 301), four test methods (EN 302 Parts 1 to 4) used to assess the performance of adhesives after specified heat and humidity treatments, and three test methods (ENV 302-5 and EN 302 Parts 6 and 7) to characterise the working properties of the adhesive. EN 301 and EN
23、 302 Parts 1 to 4 and Parts 6 and 7 have the following titles. EN 301 Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 302 Adhesives for lead-bearing timber structures Test methods Part 1: Determination of bond strength in longit
24、udinal tensile 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
25、 6: Determination of the conventional pressing time Part 7: Determination of the conventional working life ENV 302-5:2001 has the title Adhesives for load-bearing timber structures Test methods Part 5: Determination of the conventional assembly time. According to the CEN/CENELEC Internal Regulations
26、, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
27、Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SANS 10183-4-4:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-4:2004 (E) 4 1 Scope This part of EN 302 specifies a method for determining the ext
28、ent to which wood shrinkage under drying conditions will weaken an adhesive bond. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for determining
29、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 classification of adhesives for load-bearing timber structures according to their suitability for use in defined climati
30、c environments. This test is carried out on spruce (Picea abies L.). This method is not intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service. It is not intended to be used to assess the suitability of adhesives for the m
31、anufacture of wood-based panels. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) ap
32、plies. 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, Rubber and plastics test equipment Tensile, flexural and com
33、pression types (constant rate of traverse) Specification. 3 Principle A crosswise double joint with a 0,5 mm thick glue line is submitted to a dry storage treatment and then strained to failure by a compressive shear force. 4 Safety Persons using this document shall be familiar with normal laborator
34、y practice. This document does not purport to address all safety problems, if any, associated with its use. It is the responsibility of the user to establish safety and health practices and to ensure compliance with any European or national regulatory conditions. SANS 10183-4-4:2009This s tandard ma
35、y only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-4:2004 (E) 5 5 Apparatus 5.1 Testing machine The testing machine shall be either: a) a constant rate of loading machine, capable of maintaining a rate of loading of (20 5) kN/min; or b) a constant rate of
36、 traverse machine as described in ISO 5893. 5.2 Climatic cabinets The cabinets shall be enclosures 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 (0,6 to 0,8) m/s (air speed as measured in an empty cabi
37、net); b) (20 2) C and a relative humidity of (65 5) %; c) (20 2) C and a relative humidity of (75 to 80) %. 6 Method 6.1 Selection of timber 6.1.1 General Use spruce (Picea abies L.) having a density of (425 25) kg/m measured at (12 1) % moisture content as determined by oven drying (according to EN
38、 13183-1). 6.1.2 Preparation of cover pieces From three boards with a length of at least 1 200 mm prepare three pairs of solid spruce cover pieces that are knot-free, straight grained and a) 400 mm in length b) 140 mm in width c) (20 0,5) mm in thickness after conditioning, measurement of moisture c
39、ontent (oven dry method according to EN 13183-1) and final preparation, with growth rings that are approximately tangential to the face and have a radius of 60 mm to 140 mm. Each matching pair of cover pieces is intended for the production of a specimen. 6.1.3 Preparation of core pieces Prepare thre
40、e 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 core pieces shall be a) 400 mm in length b) 140 mm in width SANS 10183-4-4:2009This s tandard may only be used and printed by approved subscri
41、ption and freemailing clients of the SABS .EN 302-4:2004 (E) 6 c) (40,0 0,5) mm in thickness after conditioning, measurement of moisture content (oven dry method according to EN 18183-1) and final preparation. These laminated core pieces shall be produced from two boards with a width of (75 2) mm, a
42、nd a thickness of at least 48 mm. The two boards shall be bonded together longitudinally with a phenol-resorcinol-formaldehyde adhesive that has passed EN 301 (used according to the adhesive manufacturers instructions), with an annual ring orientation as indicated in Figure 1. Dimensions in millimet
43、res Key 1 PRF bond line Angle of annual ring orientation to the surface Figure 1 Cross-section of the laminated spruce core piece before planning and capping to the required dimensions of 140 mm wide by (40,0 0,5) mm thick 6.1.4 Conditioning Condition the core and cover pieces such that the average
44、moisture 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 C and 75 % to 80 % relative humidity would be expected to give rise to
45、 a moisture content in the wood of between 16 % and 18 %. Not more than eight hours before bonding, either lightly plane, or lightly sand using a grade P 100 abrasive paper complying with FEPA Standard 43-GB, each surface to be bonded. Remove any dust carefully. Do not touch or soil the prepared sur
46、face. SANS 10183-4-4:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-4:2004 (E) 7 6.2 Preparation of the bonded assemblies Before bonding the specimens together, take a sample from each of the core and cover pieces for the wood moi
47、sture 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= 12 324UU U+where Um= the specimens mean moisture content in percent; U1= the moisture content of the first cover piece in percen
48、t; U2= the moisture content of the second cover piece in percent; U3= the moisture content of the core piece in percent. Prepare the bonded assemblies as shown in Figure 2 with the curvature of the growth rings of the cover pieces away from the surfaces to be bonded (Figure 2 c), and the grain of th
49、e cover pieces at right angles to the grain of the core piece (Figures 2 a) and 2 b). Fix two (0,5 0,01) mm thick aluminium spacer frames (Figure 3), one spacer on the core piece and one spacer on the cover piece to limit the bond area to (100 0,1) mm x (100 0,1) mm and the nominal bond line thickness to 0,50 mm. NOTE 1 If no other instructions are provided by the adhesive manufacturer, apply the adhesive on the surface of the core piece to be bonded as well as on the surface of the cover piece to be
