SIST EN 302-3:2013
(Main)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
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
This Part of EN 302 specifies a method for determining the effect on bond strength of damage to wood fibres caused by the action of acids from the adhesive during climatic cycling. It is suitable for the following applications: a) 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 if the adhesive after bonding has a damaging influence on the strength of the wood due to chemical action. 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 climatic 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 manufacture of wood-based panels. NOTE Attention is drawn to the fact that the performance requirement established in EN 301 for the acid fibre damage test applies only if either: 1) the adhesive mixture, or 2) one of the adhesive components, when applied separately, shows a pH value lower than 4,0, as determined by EN 1245.
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 3: Bestimmung des Einflusses von Säureschädigung der Holzfasern durch Temperatur- und Feuchtezyklen auf die Querzugfestigkeit
Dieser Teil von EN 302 legt ein Verfahren zur Bestimmung des Einflusses von Holzfaserschädigung auf die Klebstofffugenfestigkeit, verursacht durch die Wirkung von Säuren des Klebstoffes während einer zyklischen Klimabeanspruchung, fest.
Er ist für folgende Anwendungsfälle geeignet:
a) zur Beurteilung der Übereinstimmung von Klebstoffen mit EN 301;
b) zur Beurteilung der Eignung und Qualität von Klebstoffen für tragende Holzbauteile;
c) zur Feststellung, ob der Klebstoff nach der Verklebung infolge chemischer Vorgänge einen schädigenden Einfluss auf die Holzfestigkeit hat.
Diese Prüfung dient hauptsächlich der Ermittlung von Leistungswerten für die Klassifizierung von Klebstoffen für tragende Holzbauteile entsprechend ihrer Eignung zum Einsatz unter bestimmten klimatischen Bedingungen. Diese Prüfung wird mit Fichte (Picea abies L.) durchgeführt.
Dieses Verfahren ist nicht zur Ermittlung von Rechenwerten für die Konstruktion geeignet und gibt nicht zwangsläufig das Verhalten des verklebten Bauteiles in Gebrauch wieder.
Adhésifs pour structures portantes en bois - Méthodes d'essai - Partie 3: Détermination de l'influence de l'attaque d'acide des fibres de bois, résultant de traitements cycliques en température et humidité sur la résistance à la traction transversale
Cette partie de l’EN 302 décrit une méthode de détermination de l’influence sur la résistance à la rupture d’un joint de l’attaque des fibres de bois provoquée par l’action d’acides contenus dans l’adhésif pendant des traitements cycliques climatiques.
Elle concerne les applications suivantes :
a) évaluation de la conformité des adhésifs à l’EN 301 ;
b) évaluation de l’aptitude et de la qualité des adhésifs pour les structures portantes en bois ;
c) détermination de l’éventuelle influence nuisible de l’adhésif après collage sur la résistance du bois résultant d’une action chimique.
Le présent essai est principalement destiné à obtenir des données de performances en vue de la classification des adhésifs pour les structures portantes en bois en fonction de leur aptitude à l’utilisation dans des environnements climatiques définis. Cet essai est réalisé sur de l’épicéa (Picea abies L.).
La présente méthode n’est pas destinée à fournir des données numériques relatives à la conception et ne représente pas nécessairement les performances de l’élément collé dans son application.
Lepila za nosilne lesene konstrukcije - Preskusne metode - 3. del: Ugotavljanje vpliva kislinskih poškodb lesnih vlaken, nastalih zaradi cikličnih obremenitev s temperaturo in vlago, na prečno natezno trdnost
Ta del standarda EN 302 določa metodo za ugotavljanje vpliva poškodb lesnih vlaken na sprijemno trdnost, ki nastanejo zaradi delovanja kislin iz lepila med podnebno obremenitvijo. Metoda se uporablja za: a) oceno skladnosti lepil s standardom EN 301; b) oceno ustreznosti in kakovosti lepil za nosilne lesene konstrukcije; c) ugotavljanje, ali ima lepilo po sprijemanju škodljiv vpliv na trdnost lesa zaradi delovanja kemikalij. Ta preskus je namenjen zlasti pridobivanju podatkov o lastnostih za razvrstitev lepil za nosilne lesene konstrukcije glede na njihovo ustreznost za uporabo v opredeljenih podnebnih okoljih. Pri tem poskusu se uporablja smreka (Picea abies L.). Ta metoda ni namenjena za zagotavljanje številčnih podatkov o zasnovi, pri čemer ne predstavlja nujno lastnosti zlepljenega elementa v uporabi. Ni namenjena za oceno ustreznosti lepil za proizvodnjo lesnih plošč. OPOMBA Opozoriti je treba, da se zahteva glede lastnosti iz standarda EN 301 za preskus kislinskih poškodb vlaken uporablja le, če ima: 1) mešanica lepila ali 2) ena od sestavin lepila pri ločenem nanosu vrednost pH nižjo od 4,0, kot je določeno v standardu EN 1245.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 3: Bestimmung des Einflusses von Säureschädigung der Holzfasern durch Temperatur- und Feuchtezyklen auf die QuerzugfestigkeitAdhésifs pour structures portantes en bois - Méthodes d'essai - Partie 3: Détermination de l'influence de l'attaque d'acide des fibres de bois, résultant de traitements cycliques en température et humidité sur la résistance à la traction transversaleAdhesives 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 strength91.080.20Lesene konstrukcijeTimber structures83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 302-3:2013SIST EN 302-3:2013en,de01-maj-2013SIST EN 302-3:2013SLOVENSKI
STANDARDSIST EN 302-3:2004/A1:2006SIST EN 302-3:20041DGRPHãþD
SIST EN 302-3:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 302-3
March 2013 ICS 83.180 Supersedes EN 302-3:2004English Version
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
Adhésifs pour structures portantes en bois - Méthodes d'essai - Partie 3: Détermination de l'influence de l'attaque d'acide des fibres de bois, résultant de traitements cycliques en température et humidité sur la résistance à la traction transversale
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 3: Bestimmung des Einflusses von Säureschädigung der Holzfasern durch Temperatur- und Feuchtezyklen auf die Querzugfestigkeit This European Standard was approved by CEN on 5 February 2013.
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 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 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 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, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 302-3:2013: ESIST EN 302-3:2013
EN 302-3:2013 (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 Selection of timber.7 5.2 Preparation of the bonded assemblies.7 5.3 Preparation of the test pieces .9 5.4 Number of test pieces .9 5.5 Climatic and cyclic storage conditions .9 5.6 Test procedure .9 6 Expression of results . 10 7 Test report . 10 7.1 The adhesive . 10 7.2 Preparation of test pieces and testing procedures . 10 7.3 Test results . 11 Bibliography . 12
SIST EN 302-3:2013
EN 302-3:2013 (E) 3 Foreword This document (EN 302-3:2013) 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 publication 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 CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 302-3:2004. The following modification has been made: The amendment in A1 has been included in the standard. 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 Republic 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. SIST EN 302-3:2013
EN 302-3:2013 (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 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 polymerised isocyanate adhesives (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, phenolic and aminoplastic, for load-bearing timber structures — Classification and performance requirements EN 15425, Adhesives — One component polyurethane for load bearing requirements prEN 16254, Adhesives — Emulsion polymerized isocyanate (EPI) for load-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 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: Determination 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 — 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 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 safety and health practices and to ensure compliance with any regulatory conditions. SIST EN 302-3:2013
EN 302-3:2013 (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 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
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