EN 302-8:2017

SLOVENSKI STANDARD
01-april-2017
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SIST EN 15416-2:2008
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Adhesives for load-bearing timber structures - Test methods - Part 8: Static load test of
multiple bond line specimens in compression shear
Klebstoffe für tragende Holzbauteile - Prüfverfahren - Teil 8: Statische
Belastungsprüfung an Prüfkörpern mit mehreren Klebstofffugen bei Druck-
Scherbeanspruchung
Adhésifs pour structures portantes en bois - Méthodes d'essai - Partie 8 : Essai de
charge statique sur des éprouvettes à joints multiples en cisaillement par compression
Ta slovenski standard je istoveten z: EN 302-8:2017
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 302-8
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2017
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 15416-2:2007
English Version
Adhesives for load-bearing timber structures - Test
methods - Part 8: Static load test of multiple bond line
specimens in compression shear
Adhésifs pour structures portantes en bois - Méthodes Klebstoffe für tragende Holzbauteile - Prüfverfahren -
d'essai - Partie 8 : Essai de charge statique sur des Teil 8: Statische Belastungsprüfung an Prüfkörpern mit
éprouvettes à joints multiples en cisaillement par mehreren Klebstofffugen bei Druck-
compression Scherbeanspruchung
This European Standard was approved by CEN on 30 October 2016.

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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR 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 Ref. No. EN 302-8:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Principle . 6
4 Apparatus . 6
4.1 Test jig . 6
4.2 Equipment for climate control . 9
4.3 Testing machine . 9
5 Test specimens . 9
5.1 Selection of wood . 9
5.2 Preparation of laminations . 9
5.3 Preparation of test specimens . 12
6 Test procedure . 12
6.1 Application of load . 12
6.2 Test climates . 13
6.3 Measurements and evaluation of result . 13
7 Test report . 13
Bibliography . 15

European foreword
This document (EN 302-8:2017) 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 July 2017, and conflicting national standards shall be
withdrawn at the latest by July 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15416-2:2007.
Compared to EN 15416-2:2007, the following modifications have been made:
a) title has been changed;
b) EN 301 and EN 16254 are included in the scope;
c) introduction of (50 ± 2) °C and (90 ± 2) °C in Table 1, climate 1, with reference to EN 15425;
d) layout has been made in line with EN 302-1:2013 to EN 302-7:2013;
e) new drawings of the test jig with some adjusted part dimensions are included.
This document is one of a package dealing with adhesives for use with timber structures, and is
published in support to EN 1995, Eurocode 5: Design of timber structures (all parts).
The package 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 polymerized isocyanate adhesives (EN 16254), and
— twelve test methods (EN 302 parts 1 to 8, EN 15416 parts 1, 3, 4 and 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 (PUR) for load-bearing timber structures -
Classification and performance requirements
— EN 16254, Adhesives — Emulsion polymerized isocyanate (EPI) for load-bearing timber structures —
Classification and performance requirements
— EN 302-1, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of
longitudinal tensile shear strength
— EN 302-2, Adhesives for load-bearing timber structures — Test methods — Part 2: Determination of
resistance 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 methods — Part 4: Determination of
the effects of wood shrinkage on the shear strength
— EN 302-5, Adhesives for load-bearing timber structures — Test methods — Part 5: Determination of
maximum assembly time under referenced conditions
— EN 302-6, Adhesives for load-bearing timber structures — Test methods — Part 6: Determination of
the minimum pressing time under referenced conditions
— EN 302-7, Adhesives for load-bearing timber structures — Test methods — Part 7: Determination of
the working life under referenced conditions
— EN 302-8, Adhesives for load-bearing timber structures — Test methods — Part 8: Static load test of
multiple bond line specimens in compression shear
— EN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic —
Test methods — Part 1: Long-term tension load test perpendicular to the bond line at varying climate
conditions with specimens perpendicular to the glue line (Glass house test)
— EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic —
Test methods — Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in
bending shear
— EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic —
Test methods — Part 4: Determination of open assembly time under referenced conditions
— EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic —
Test methods — Part 5: Determination of minimum pressing time under referenced conditions
According to the CEN-CENELEC Internal Regulations, the national standards 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, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
Safety statement
Persons using this European Standard should be familiar with the normal laboratory practice, if
applicable. This European Standard 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.
Environmental statement
It is understood that some of the material permitted in this European Standard may have negative
environmental impact. As technological advantages lead to better alternatives for these materials, they
will be eliminated from this European Standard to the extent possible.
At the end of the test, it is recommended that the user of this European Standard take care to carry out
an appropriate disposal of the wastes, according to local regulation.
1 Scope
This European Standard specifies a method of determining the ability of adhesive bonds to resist static
load. It is applicable to adhesives used in load bearing timber structures.
It is suitable for the following applications:
a) for assessing the compliance of adhesives according to EN 301, EN 15425 and EN 16254;
b) for assessing the suitability and quality of adhesives for load-bearing timber structures;
c) for assessing the effect on the bond strength resulting from constant load at different climate
conditions.
This method 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 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
The following documents, in whole or in part, are normatively referenced in this document 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 301:2013, Adhesives, phenolic and aminoplastic, for load-bearing timber structures — Classification
and performance requirements
EN 15425:2017, Adhesives — One component polyurethane (PUR) for load-bearing timber structures —
Classification and performance requirements
EN 16254:2013+A1:2016, Adhesives — Emulsion polymerized isocyanate (EPI) for load-bearing timber
structures — Classification and performance requirements
3 Principle
Bonded test pieces are subjected to a constant compression shear load under a series of three different
climates. Number of failures and the amount of deformation is measured after the end of the last
climate cycle.
4 Apparatus
4.1 Test jig
The test Equipment is shown in Figure 1 and Figure 2.
Dimensions in millimetres
Key
1 top plate
2 spacer plate
3 base plate
4 tension rod
5 centre rod
Figure 1 — Test jig
Dimensions in millimetres
Key
1 top plate 3 base plate
2 spacer plate 4 tension rod (the given lengths are minimum values)
5 centre rod. (the given length is a minimum value)
Figure 2 — Dimensions
...