EN 17224:2019
(Main)Determination of compressive shear strength of wood adhesives at elevated temperatures
Determination of compressive shear strength of wood adhesives at elevated temperatures
This document specifies a test method for determining the comparative compression shear strength of adhesive bonds and solid wood at both ambient temperature and elevated temperature. The maximum load of the test pieces at ambient temperature and after exposure to a specific elevated temperature for a specified duration of time is evaluated. It is applicable to adhesives used in load bearing timber structures and to other wood adhesives.
This method is intended primarily to obtain performance data for the influence of elevated temperatures on the behaviour of adhesive bonds.
This method is not intended to provide data for structural design, and does not necessarily represent the performance of the bonded element in service.
Bestimmung der Druck-Scherfestigkeit von Holzklebstoffen bei erhöhten Temperaturen
Dieses Dokument legt ein Prüfverfahren zur Bestimmung der relativen Druck-Scherfestigkeit von Klebstoffverbindungen und Vollholz bei Umgebungstemperatur und erhöhter Temperatur fest. Die Höchstlast der Prüfkörper bei Umgebungstemperatur und nach Einwirkung einer bestimmten erhöhten Temperatur für eine bestimmte Dauer werden bestimmt. Es gilt für Klebstoffe für tragende Holzbauteile und andere Holzklebstoffe.
Dieses Verfahren ist hauptsächlich dafür vorgesehen, Leistungsdaten für den Einfluss erhöhter Temperaturen auf das Verhalten der Klebstoffverbindungen zu erhalten.
Dieses Verfahren ist nicht dafür vorgesehen, Bemessungswerte bereitzustellen und gibt nicht zwangsläufig die Leistungsfähigkeit des verklebten Bauteils im Gebrauch wieder.
Détermination de la résistance des adhésifs de bois au cisaillement par compression à températures élevées
Le présent document spécifie une méthode d’essai visant à déterminer la résistance comparative au cisaillement par compression des joints de colle et du bois massif à la fois à température ambiante et à température élevée. La charge maximale des éprouvettes à température ambiante et après exposition à une température élevée spécifique pendant une durée déterminée est évaluée. Le présent document s’applique aux adhésifs utilisés dans les structures portantes en bois et aux autres adhésifs pour bois.
Cette méthode est principalement destinée à obtenir des données de performances concernant l’influence des températures élevées sur le comportement des joints de colle.
Cette méthode n’est pas destinée à fournir des données pour le calcul de structures et ne représente pas nécessairement les performances de l’élément collé en service.
Ugotavljanje tlačne strižne trdnosti lesnih lepil pri povišanih temperaturah
Ta dokument določa preskusno metodo za določanje primerjalne tlačne strižne trdnosti sprijetih lepil in masivnega lesa pri temperaturi okolice ter povišani temperaturi. Ocenjuje se največja obremenitev preskušancev pri temperaturi okolice in po izpostavljenosti določeni povišani temperaturi za določen čas. Uporablja se za lepila za nosilne lesene konstrukcije in druga lesna lepila.
Primerna je za ocenjevanje vpliva povišanih temperatur na tlačno strižno silo sprijetega lepila.
Ta metoda je namenjena predvsem pridobivanju podatkov o vplivu povišanih temperatur na vedenje sprijetih lepil. Uporablja se lahko za ocenjevanje lepil za nosilne lesene konstrukcije in tudi za ocenjevanje lepil za nenosilne lesene elemente glede na njihovo primernost za oblikovanje vezi v določenih klimatskih okoljih pri povišanih temperaturah.
Ta metoda ni namenjena zagotavljanju podatkov za konstrukcijsko zasnovo, pri čemer ne predstavlja nujno lastnosti zlepljenega elementa v uporabi.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2019
Ugotavljanje tlačne strižne trdnosti lesnih lepil pri povišanih temperaturah
Determination of compressive shear strength of wood adhesives at elevated
temperatures
Bestimmung der Druck-Scherfestigkeit von Holzklebstoffen bei erhöhten Temperaturen
Détermination de la résistance des adhésifs de bois au cisaillement par compression à
températures elevées
Ta slovenski standard je istoveten z: EN 17224:2019
ICS:
83.180 Lepila Adhesives
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17224
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2019
EUROPÄISCHE NORM
ICS 83.180
English Version
Determination of compressive shear strength of wood
adhesives at elevated temperatures
Détermination de la résistance des adhésifs de bois au Bestimmung der Druck-Scherfestigkeit von
cisaillement par compression à températures élevées Holzklebstoffen bei erhöhten Temperaturen
This European Standard was approved by CEN on 26 May 2019.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17224:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 2
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Apparatus . 5
5.1 Test jig . 5
5.2 Climate chamber or oven . 5
5.3 Thermocouples . 6
5.4 Testing machine . 6
6 Test specimens . 6
6.1 Selection of wood . 6
6.2 Preparation of test pieces . 6
7 Test procedure . 9
7.1 Test at ambient temperature . 9
7.2 Test at elevated temperature . 10
7.3 Evaluation of result . 11
8 Expression of results and test report . 12
Bibliography . 13
European foreword
This document (EN 17224:2019) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,
the secretariat of which is held by UNE.
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 January 2020, and conflicting national standards shall
be withdrawn at the latest by January 2020.
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.
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 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.
Environmental statement
It is understood that some of the material permitted in this document can have negative environmental
impact. As technological advantages lead to better alternatives for these materials, they will be
eliminated from this document to the extent possible.
At the end of the test, the user of the document should take care to carry out an appropriate disposal of
the wastes, according to local regulation.
1 Scope
This document specifies a test method for determining the comparative compression shear strength of
adhesive bonds and solid wood at both ambient temperature and elevated temperature. The maximum
load of the test pieces at ambient temperature and after exposure to a specific elevated temperature for
a specified duration of time is evaluated. It is applicable to adhesives used in load bearing timber
structures and to other wood adhesives.
This method is intended primarily to obtain performance data for the influence of elevated
temperatures on the behaviour of adhesive bonds.
This method is not intended to provide data for structural design, and does not necessarily represent
the performance of the bonded element in service.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 923, Adhesives — Terms and definitions
EN 14080:2013, Timber structures — Glued laminated timber and glued solid timber — Requirements
3 Terms and definitions
For the purposes of this document the terms and definitions given in EN 923 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
http://www.electropedia.org/
• IEC Electropedia: available at
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Principle
Solid wood test pieces and adhesively bonded test pieces are prepared. Both types of test pieces are
tested in a compression shear test according to EN 14080:2013, Annex D at ambient temperature and
after exposure to an elevated temperature. The compression shear strength of the solid wood test
pieces and the adhesively bonded test pieces at ambient temperature and elevated temperature is
compared in order to evaluate the shear strength of the adhesive at elevated temperature.
5 Apparatus
5.1 Test jig
The test equipment described in EN 14080:2013, Annex D is suitable for the performance of the shear
test.
5.2 Climate chamber or oven
A climate chamber or oven capable of maintaining the targeted temperature to within ±2 °C and with
sufficient air circulation to provide constant temperature conditions within the oven interior for the
heating of the test pieces.
5.3 Thermocouples
Thermocouples capable of measuring the temperature in the test pieces to within ±2 °C.
5.4 Testing machine
A testing machine capable of performing the block shear test specified in EN 14080:2013, Annex D with
an accuracy of ±1 % of the maximum load is required for the performance of the shear tests.
6 Test specimens
6.1 Selection of wood
In general, Norway spruce (Picea abies L.) with a density of (450 ± 25) kg/m at 12 % moisture content
is used. The test with Norway spruce also covers Silver fir (Abies alba) and Scots pine (Pinus sylvestris).
The use of other wood species is possible.
NOTE When using other wood species, the test results are considered to be representative of the density
range used in the test. It is assumed that the results apply to lower densities as well.
The material shall be straight-grained and free from knots, reaction wood, machining defects (such as
chipped grain, dubbed ends, feed roll polish, coarse knife marks and feed roll compression) and any
drying defects such as case hardening, collapse, splits or checks. The raw material for the preparation of
the test pieces shall have dimensions of at least 150 mm (width) × 50 mm (height) and a length of at
least 300 mm.
The angle of the annual rings to the surface, as measured from the wide face, shall be between 45° and
90°.
When testing adhesives used in load-bearing timber structures, the wood shall be conditioned at
(20 ± 2) °C and a relative humidity of (65 ± 5) % until a moisture content of (12 ± 1) % has been
obtained.
When testing wood adhesives for non-load-bearing applications, the wood may alternatively be
conditioned at (23 ± 2) °C and a relative humidity of (50 ± 5) % until equilibrium moisture content is
obtained.
Plane each lamination not more than 8 h before the bonding of the test pieces.
6.2 Preparation of test pieces
Solid wood block shear test pieces and adhesively bonded block shear test pieces shall be produced. To
ensure that all test pieces have a comparable wood quality, the solid wood test pieces and the
adhesively bonded test pieces shall be produced using the same raw material following the principle as
shown in Figure 1. At least four test pieces, two solid wood test pieces for testing at ambient
temperature and elevated temperature and two adhesively bonded test pieces for testing at ambient
temperature and elevated temperature, shall be produced from one board.
Key
1 solid, ambient temperature 5 grain direction
2 solid, elevated temperature 6 side-matched specimens
3 bonded, ambient temperature 7 bondline
4 bonded, elevated temperature
Figure 1 — Principle for production of side-matched test pieces
20 bonded test pieces shall be prepared in accordance with Figure 2. In addition, 20 solid wood control
test pieces shall be produced with the same dimensions as the bonded test pieces. The bonded test
pieces and the matched solid wood test pieces shall be produced as 20 pairs. Care shall be taken to
ensure the same annual ring orientation when bonding the laminations together into a bonded
assembly.
Dimensions in millimetres
Key
1 grain direction
Figure 2 — Form and dimensions of the final block shear test pieces
The bonded test pieces shall be prepared from laminations (16,0 ± 0,1) mm thick (after planing) by
(60,0 ± 0,1) mm wide. The adhesive preparation and the bonding procedure shall follow the adhesive
manufacturer’s recommendation.
After the bonding process, the bonded laminations shall be conditioned for a minimum of 14 d in
standard climate 20 °C and 65 % relative humidity. After the conditioning period, the bonded
laminations shall be planed or cut to the final width. The test pieces are cut to the final dimensions
before the test is started. The shear area of the test pieces shall be (40,0 ± 0,1) mm × (50,0 ± 0,1) mm,
see Figure 2.
On
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