SIST ENV 13381-3:2003
(Main)Test methods for determining the contribution to the fire resistance of structural members - Part 3: Applied protection to concrete members
Test methods for determining the contribution to the fire resistance of structural members - Part 3: Applied protection to concrete members
This part of this European Prestandard specifies a test method for determining the contribution of fire protection systems to the fire resistance of structural concrete members, for instance slabs, floors, roofs and walls and which can include integral beams and columns. The concrete can be lightweight, normalweight or heavyweight concrete and of strength classes 20/25 (LC/C/HC) to 50/60 (LC/C/HC). The member can contain steel reinforcing bars.
The test method is applicable to all fire protection materials used for the protection of concrete members and includes sprayed materials, coatings, cladding protection systems and multi-layer or composite fire protection materials, when the gap between the fire protection material and the concrete member is less than 5 mm. Otherwise the test methods in prENV 13381-1 or prENV 13381-2, as appropriate, apply
This European Prestandard contains the fire test which specifies the tests which should be carried out to determine the ability of the fire protection material to remain coherent and fixed to the concrete and to provide data on the temperature distribution throughout the protected concrete member, when exposed to the standard temperature time curve.
In special circumstances, where specified in national building regulations, there can be a need to subject the protection material to a smouldering curve. The test for this and the special circumstances for its use are detailed in annex A.
The fire test methodology makes provision for the collection and presentation of data which can be used as direct input to the calculation of fire resistance of concrete members in accordance with the procedures given in ENV 1992-1-2.
This European Prestandard also contains the assessment which prescribes how the analysis of the test data should be made and gives guidance to the procedures by which interpolation should be undertaken.
The limits of applicability of the results of the assessment arising from the fire test ar
Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden Bauteilen - Teil 3: Brandschutzmaßnahmen für Betonbauteile
Dieser Teil dieser Europäischen Vornorm legt ein Prüfverfahren fest zur Bestimmung des Beitrags von Brandschutzsystemen zur Feuerwiderstandsfähigkeit tragender Betonbauteile, zum Beispiel Platten, Decken, Dächer und Wände, die integrierte Balken und Stützen enthalten können. Der Beton kann Leichtbeton, Normalbeton oder Schwerbeton der Festigkeitsklassen 20/25 (LC/C/HC) bis 50/60 (LC/C/HC) sein. Das Bauteil kann Bewehrungsstähle enthalten.
Das Prüfverfahren gilt für alle Brandschutzmaterialien, die für den Schutz der Betonbauteile verwendet werden und beinhaltet aufgesprühte Materialien, Bekleidungen, Beschichtungsschutzsysteme und Mehrschicht- oder Verbundsysteme mit einem Abstand von höchstens 5 mm zwischen dem Brandschutzmaterial und dem Betonbauteil. Andernfalls gelten je nach Erfordernis die Prüfverfahren nach prENV 13381-1 oder ENV 13381-2.
Diese Europäische Vornorm beinhaltet die Brandprüfung, die durchgeführt werden sollte, um die Fähigkeit des Brandschutzmaterials, mit dem Beton fest verbunden zu bleiben, zu bestimmen und um Daten über die Temperaturverteilung im geschützten Betonbauteil zu liefern, wenn dieses der Einheits-Temperaturzeitkurve ausgesetzt wird.
Unter besonderen Umständen, die in nationalen Bauvorschriften festgelegt sind, kann es erforderlich sein, das Brandschutzmaterial einer Schwelbrandkurve zu unterziehen. Die Prüfung und die besonderen Umstände für deren Anwendung sind in Anhang A angegeben.
Die Methodologie der Brandprüfung gibt die Möglichkeit, Messwerte zu ermitteln, die direkt als Eingangswerte zur Berechnung des Feuerwiderstandes von Betonbauteilen entsprechend den Verfahren nach ENV 1992-1-2 benutzt werden können.
Diese Europäische Vornorm beinhaltet außerdem das Verfahren zur Beurteilung der Interpretation der Ergebnisse aus den Brandprüfungen und eine Anleitung zu den Verfahren der Interpolation.
Der zulässige Bereich der Anwendbarkeit der Ergebnisse aus der Beurteilung der Brandprüfung ist zusammen mit dem zulässigen direk
Méthode d'essai pour déterminer la contribution a la résistance au feu des éléments de construction - Partie 3: Protection appliquée aux éléments en béton
Cette partie de l'ENV 13381 spécifie une méthode d'essai permettant de déterminer la contribution apportée par les systemes de protection contre le feu a la résistance au feu des éléments de construction en béton, tels que des dalles, planchers, toits et murs, et qui peuvent inclure des poutres ou des poteaux intégrées. Le béton peut etre de type léger, normal ou compact et appartenir aux classes de résistance aux contraintes 20/25 (LC/C/HC) a 50/60 (LC/C/HC). L'élément de construction en béton peut contenir des barres d'armature en acier.La méthode d'essai est applicable a tous les matériaux de protection contre le feu utilisés pour protéger les éléments de construction en béton et englobe les matériaux appliqués par projection, les revetements, les systemes de protection plaqués et les matériaux de protection contre le feu multi-couches ou composites, lorsque l'espace de séparation éventuel entre le matériau de protection contre le feu et l'élément en béton doit toujours etre inférieur a 5 mm, sinon il convient d'utiliser selon le cas, les autres méthodes d'essai définies dans le prENV 13381-1 ou l'ENV 13381-2 La membrane de protection verticale peut etre séparée de l'élément de construction et etre auto-porteuse, ou elle peut etre fixée sur l'élément de construction et peut faire partie d'une structure porteuse. Cette méthode d'essai est applicable aux membranes de protection verticale avec un La présente prénorme européenne contient l'essai au feu qui spécifie les essais qui devraient etre effectués pour déterminer l'aptitude du matériau de protection contre le feu a rester cohérent et fixé sur le béton, et pour obtenir des données concernant la répartition de la température sur l'ensemble de l'élément en béton protégé, lorsque celui est exposé au feu suivant la courbe de température/temps normalisée. La méthodologie des essais au feu comporte des dispositions concernant le recueil et la présentation de données susceptibles de servir comme des entrées directe
Preskusne metode za ugotavljanje prispevka k požarni odpornosti konstrukcijskih elementov - 3. del: Zaščita betonskih elementov
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ENV 13381-3:2003
01-januar-2003
3UHVNXVQHPHWRGH]DXJRWDYOMDQMHSULVSHYNDNSRåDUQLRGSRUQRVWLNRQVWUXNFLMVNLK
HOHPHQWRYGHO =DãþLWDEHWRQVNLKHOHPHQWRY
Test methods for determining the contribution to the fire resistance of structural members
- Part 3: Applied protection to concrete members
Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden
Bauteilen - Teil 3: Brandschutzmaßnahmen für Betonbauteile
Méthode d'essai pour déterminer la contribution a la résistance au feu des éléments de
construction - Partie 3: Protection appliquée aux éléments en béton
Ta slovenski standard je istoveten z: ENV 13381-3:2002
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.080.40 Betonske konstrukcije Concrete structures
SIST ENV 13381-3:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ENV 13381-3:2003
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SIST ENV 13381-3:2003
EUROPEAN PRESTANDARD
ENV 13381-3
PRÉNORME EUROPÉENNE
EUROPÄISCHE VORNORM
July 2002
ICS 13.220.50
English version
Test methods for determining the contribution to the fire
resistance of structural members - Part 3: Applied protection to
concrete members
This European Prestandard (ENV) was approved by CEN on 1 March 2002 as a prospective standard for provisional application.
The period of validity of this ENV is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the ENV can be converted into a European Standard.
CEN members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final
decision about the possible conversion of the ENV into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. ENV 13381-3:2002 E
worldwide for CEN national Members.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
Contents
page
Foreword .3
1 Scope .4
2 Normative references.4
3 Terms and definitions, symbols and units.5
4 Test equipment .7
5 Test conditions .7
6 Test specimens.9
7 Installation of the test construction .13
8 Conditioning.14
9 Application of instrumentation .14
10 Test procedure .17
11 Test results.18
12 Test report.19
13 Assessment .19
14 Report of the assessment .21
15 Limits of applicability of the results of the assessment.22
Annex A (normative) Test method to the smouldering fire or slow heating curve.33
Annex B (normative) Measurement of properties of fire protection materials .35
Annex C (normative) Equivalent thickness of concrete .38
Bibliography.41
2
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
Foreword
This document ENV 13381-3:2002 has been prepared by Technical Committee CEN/TC127 "Fire safety in buildings",
the secretariat of which is held by BSI.
This document has been prepared under a mandate given to CEN by the European Commission and the European Free
Trade Association.
As there was little experience in carrying out these tests in Europe CEN/TC127 agreed that more experience should be
built up during a prestandardization period before agreeing text as European Standards. Consequently all parts are being
prepared as European Prestandards.
This European Prestandard is one of a series of standards for evaluating the contribution to the fire resistance of structural
members by applied fire protection materials. Other parts of this ENV are:
Part 1: Horizontal protective membranes.
Part 2: Vertical protective membranes.
Part 4: Applied protection to steel members.
Part 5: Applied protection to concrete/profiled sheet steel composite members.
Part 6: Applied protection to concrete filled hollow steel columns.
Part 7: Applied protection to timber members.
Annexes A, B and C are normative.
Caution
The attention of all persons concerned with managing and carrying out this fire resistance test, is drawn to the fact that
fire testing can be hazardous and that there is a possibility that toxic and/or harmful smoke and gases can be evolved
during the test. Mechanical and operational hazards can also arise during the construction of test elements or structures,
their testing and the disposal of test residues.
An assessment of all potential hazards and risks to health should be made and safety precautions should be identified and
provided. Written safety instructions should be issued. Appropriate training should be given to relevant personnel.
Laboratory personnel should ensure that they follow written safety instructions at all times.
The specific health and safety instructions contained within this prestandard should be followed.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries
are bound to announce this European Prestandard: Austria, Belgium, Czech Republic, Denmark, Finland, France,
Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
and the United Kingdom.
3
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
1 Scope
This part of this European Prestandard specifies a test method for determining the contribution of fire protection
systems to the fire resistance of structural concrete members, for instance slabs, floors, roofs and walls and which
can include integral beams and columns. The concrete can be lightweight, normalweight or heavyweight concrete
and of strength classes 20/25 (LC/C/HC) to 50/60 (LC/C/HC). The member can contain steel reinforcing bars.
The test method is applicable to all fire protection materials used for the protection of concrete members and
includes sprayed materials, coatings, cladding protection systems and multi-layer or composite fire protection
materials, when the gap between the fire protection material and the concrete member is less than 5 mm.
Otherwise the test methods in prENV 13381-1 or ENV 13381-2, as appropriate, apply.
This European Prestandard contains the fire test which specifies the tests which should be carried out to
determine the ability of the fire protection material to remain coherent and fixed to the concrete and to provide
data on the temperature distribution throughout the protected concrete member, when exposed to the standard
temperature time curve.
In special circumstances, where specified in national building regulations, there can be a need to subject the
protection material to a smouldering curve. The test for this and the special circumstances for its use are detailed
in annex A.
The fire test methodology makes provision for the collection and presentation of data which can be used as direct
input to the calculation of fire resistance of concrete members in accordance with the procedures given in
ENV 1992-1-2.
This European Prestandard also contains the assessment which prescribes how the analysis of the test data should
be made and gives guidance to the procedures by which interpolation should be undertaken.
The limits of applicability of the results of the assessment arising from the fire test are defined together with
permitted direct application of the results to different concrete structures, densities, strengths, thicknesses and
production techniques over the range of thicknesses of the applied fire protection system tested.
2 Normative references
This European Prestandard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Prestandard only when incorporated in it by amendment or revision. For undated references the latest edition of
the publication referred to applies (including amendments).
EN 1363-1 Fire resistance tests - Part 1: General requirements.
EN 1363-2 Fire resistance tests - Part 2: Alternative and additional procedures.
ENV 10080 Steel for the reinforcement of concrete - Weldable ribbed reinforcing steel B 500 - Technical
delivery conditions for bars, coils and welded fabric.
EN 206-1 Concrete - Part 1: Specification, performance, production and conformity.
ENV 1992-1-1 Eurocode 2: Design of concrete structures -
Part 1-1: General rules and rules for buildings.
ENV 1992-1-2 Eurocode 2: Design of concrete structures -
Part 1-2: General rules - Structural fire design.
4
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
ISO 8421-2 Fire protection - Vocabulary - Part 2: Structural fire protection.
EN ISO 13943 Fire safety - Vocabulary (ISO 13943:1999).
3 Terms and definitions, symbols and units
3.1 Terms and definitions
For the purposes of this European Prestandard, the terms and definitions given in EN 1363-1, EN ISO 13943, ISO 8421-2
and EN 206-1, and the following apply:
3.1.1
concrete member
element of building construction which is loadbearing and is fabricated from concrete, defined according to EN 206-1.
It may contain steel reinforcing bars
3.1.2
fire protection material
material or combination of materials applied to the surface of a concrete member for the purpose of increasing its fire
resistance
3.1.3
passive fire protection materials
materials which do not change their physical form upon heating and which provide fire protection by virtue of their
physical or thermal properties. They may include materials containing water which, on heating, evaporates to produce
cooling effects
3.1.4
reactive fire protection materials
materials which are specifically formulated to provide a chemical reaction upon heating such that their physical form
changes and in so doing provide fire protection by thermal insulative and cooling effects
3.1.5
fire protection system
fire protection material together with a prescribed method of attachment to the concrete member
3.1.6
fire protection
protection afforded to the concrete member by the fire protection system such that the temperature throughout the depth
of the structural member and upon any steel reinforcing bars within it is limited throughout the period of exposure to fire
3.1.7
test specimen
concrete slab or beam test member plus the fire protection system under test
3.1.8
fire protection thickness
thickness of a single layer fire protection system or the combined thickness of all layers of a multilayer fire protection
system
3.1.9
stickability
ability of a fire protection material to remain sufficiently coherent and in position for a well defined range of deformations,
furnace and test specimen surface temperatures, such that its ability to provide fire protection is not significantly impaired
5
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
3.1.10
critical temperature
temperature at which failure is expected to occur in steel reinforcement within the concrete at a given load level
3.1.11
lathing
mechanical fixing aids comprising non-combustible wires or similar constructions fixed to the concrete before sprayed
fire protection material is applied
3.1.12
adhesive bond promoter
material applied to the surface of the concrete, prior to application of the fire protection material, for promotion of
increased bonding
3.1.13
equivalent thickness of concrete
theoretical thickness of concrete which provides the same thermal insulation for a given period of test as does the given
thickness of the applied fire protection system
NOTE Care should be taken to ensure when using "equivalent thickness" that in the practical situation the concrete thickness will not
be reduced by spalling etc.
3.2 Symbols and units
Symbol Unit Designation
L mm Length of the test specimen exposed to the furnace
exp
L mm Centre to centre distance between the test specimen supports
sup
L mm Total length of the test specimen
spec
W mm Width of the test specimen exposed to the furnace
exp
h mm Thickness of concrete slab or height of concrete beam specimen
l mm Distance of loading points from the specimen support points
sup
P kN Loading applied to the slab or beam test specimen
°C Critical temperature as specified in ENV 1992-1-2
crit
d mm Depth in concrete at which chosen is noted
crit
d mm Thickness of fire protection material: d is minimum thickness and dp
p p(min) (max)
is maximum applied thickness of fire protection material
°C Temperature rise, as a function of time
CL
d mm Depth in unprotected concrete slab at which is noted [used in annex
cc CL
C]
d mm Depth in protected concrete at which temperature rise d ,t) is measured
cp cp
at time t
) °C Temperature rise measured in protected concrete at measured depth d
dcp,t cp
2
f N/mm Yield strength of steel as defined in ENV 10080
y
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
mm Equivalent concrete thickness
4 Test equipment
4.1 General
The furnace and test equipment shall be as specified in EN 1363-1.
4.2 Furnace
The furnace shall be designed to permit the dimensions of the test specimen to be exposed to heating to be as
specified in 6.2 and its installation to be as specified in clause 7.
4.3 Loading equipment
Loading shall be applied according to EN 1363-1. The loading system shall permit loading, of the magnitude
defined in 5.3, to be applied along the length and width of the test specimen.
The loading equipment shall not inhibit the free movement of air above the test specimen and no part of the
loading equipment, other than at the loading points, shall be closer than 60 mm to the unexposed surface of the
test specimen.
5 Test conditions
5.1 General
Test specimens, subjected to predefined loading, are heated upon a furnace in horizontal orientation to provide
information on each of the following:
- the temperature distribution within the concrete test member;
- the behaviour of the fire protection system and its stickability;
- the behaviour of the test specimen with respect to specified performance criteria.
It is recommended that the test be continued until the mean temperature upon the main reinforcing bars within
the concrete reaches 700 °C, or any single maximum value of 750 °C is recorded, to give the necessary
information on the stickability of the fire protection system. However, these temperatures may be modified if
requested by the sponsor.
If the recommended termination temperatures are not reached after 6 hours test duration, the test shall normally
be terminated.
The procedures given in EN 1363-1 and, if applicable, EN 1363-2, shall be followed in the performance of this
test method unless specific contrary instruction is given herein.
5.2 Support and restraint conditions
5.2.1 Standard support and restraint conditions
Concrete slab test specimens shall be tested as a simply supported one way structure with two free edges and an
exposed surface and span as defined in 6.2.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
Concrete beam test specimens shall be tested simply supported. The test arrangement shall provide lateral
stability.
The concrete slab or beam test member shall be installed onto the furnace to allow freedom for longitudinal
movement and deformation using at one side rolling support(s) and at the other hinge support(s).
The surface of the bearings shall be smooth concrete or steel plates. The width of the bearings shall be the
minimum representative of practice.
5.2.2 Other support and restraint conditions
If the support and restraint conditions differ from the standard conditions specified in 5.2.1, these conditions shall
be described in the test report and the validity of the test results shall be restricted to those tested.
5.3 Loading conditions
The load (P) applied to the test specimen shall be calculated, taking account of the dead-weight of the specimen
(measured or derived by calculation from samples of the components, see 6.5.1) and the weight of load
distribution beams or plates, such that the following bending moments are produced and that the same stresses
exist within the steel reinforcement:
small slabs 5 kN.m/m width
large slabs 14 kN.m/m width
beams 25 kN.m
For concrete slab test specimens the load shall be symmetrically applied to the test specimen along two transverse
loading lines, each one at a distance (L ) from each of the supports. The proportion of the total load applied at
sup
each loading position shall be as specified in Figure 1 (small slab test specimen) and Figure 2 (large slab test
specimen). The load shall produce stresses approximating to a uniformly distributed load.
For concrete beam test specimens the load shall be symmetrically applied to the test specimen by a two point
loading system, each one at a distance (L ) from each of the supports. The proportion of the total load applied
sup
at each loading position shall be as specified in Figure 3. The load shall produce stresses approximating to a
uniformly distributed load.
Point loads shall be transferred to the test specimen through load distribution beams or plates (Figures 1, 2 and
3).
The total contact area between these and the concrete surface of the test specimen shall be as specified in
EN 1363-1, provided that the load distribution beam or plate chosen has a flexural rigidity large enough to give
the required distribution of the load.
Load distribution beams, for safety reasons, shall have a height to width ratio of < 1.
If the load distribution beams or plates are of steel or other high conductivity material, they shall be insulated
from the surface of the concrete test specimen by a suitable thermal insulation material.
Unexposed surface thermocouples shall not be closer than 100 mm to any part of the load distribution system
as shown in Figures 1, 2 and 3.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
6 Test specimens
6.1 Type and number of test specimens
6.1.1 Type of test specimens
The type of concrete test member used is determined by the type and practical situation to which the fire
protection system is to be used, i.e.:
a) fire protection systems to be used on flat, two dimensional concrete members only, such as slabs and
walls, are evaluated by carrying out the test on large concrete slabs;
b) fire protection systems to be used on beams and columns only, and subject to three and four sided
exposure, are evaluated by carrying out the test on concrete beams;
c) fire protection systems to be used on slabs, walls, beams and columns are evaluated by carrying out the
test on both concrete slabs and beams according to a) and b) above;
d) tests may be carried out, in addition to the large scale tests, on small concrete test slabs to provide
additional test results for the fire protection system when:
- it is to be applied to a concrete member of concrete thickness less than that specified in this test
method;
- it is to be applied at intermediate fire protection thickness between maximum and minimum
thickness;
- the test is carried out to the smouldering curve (annex A).
6.1.2 Number of test specimens
Two full size loaded concrete members (either slabs or beams depending upon the end use as specified in 6.1.1a)
and 6.1.1b) shall be tested.
To one the minimum thickness of the fire protection system shall be applied and to the other the maximum
thickness. If the fire protection system is only available in a single thickness, then one test on one type of member
only shall be carried out at that thickness, and the applicability of the result restricted.
In addition to the mandatory full size tests, small size tests may be carried out to obtain further data, as defined
in 6.1.1d). One such test shall be carried out for each and every variable of concrete thickness or intermediate
fire protection thickness to be considered. The use of the small slab in the smouldering fire is given in annex A.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
6.2 Size of test specimens
6.2.1 Concrete slabs
The concrete test slabs shall be of the sizes specified in Table 1 and exemplified in Figure 1 (small specimen)
and Figure 2 (large specimen).
Table 1 - Sizes of concrete test slabs
small specimen large specimen
Exposed length (mm) L 4 000 mm minimum‡ 1 300 and < 2 300
exp
Span (mm) L‡ 1 500 and < 2 700 4 200 minimum
sup
(L +200) > L < (L +400)
(L +200) > L < (L +400) exp sup exp
exp sup exp
[note] [note]
Specimen length (mm) L 4 400 mm minimum‡ 1 700 and < 3 000
spec
(L +400) > L < (L +700) (L +400) > L < (L +700)
exp spec exp exp spec exp
Exposed width (mm) W ‡ 1 000 and < 2 000‡ 3 000
exp
Thickness (mm) h (90 ± 10) (120 ± 10)
Position of loading points (600 ± 10) (1000 ± 10)
from support points (mm)
NOTE The distance between the exposed part of the test specimen and the supports shall be kept as small as possible. For tests of
short duration (less than 240 minutes) a distance of 100 mm at either end is recommended. For tests of longer duration this could be
increased to 200 mm at either end, to protect the test equipment from heat damage.
6.2.2 Concrete beams
The concrete test beams shall be of a size such that an overall exposed length (L ) not less than 4 000 mm is
exp
obtained.
The span (L ) shall not be greater than the exposed length by more than 200 mm at each end.
sup
The total specimen length (L ) shall be not greater than the exposed length by more than 350 mm at each end.
spec
The beam shall be of height (450 ± 10) mm and width (150 ± 10) mm.
The position of the loading points from the support points (lsup) shall be (1 000 ± 10) mm.
The beam construction is shown in Figure 3.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
6.3 Construction of concrete test specimens
6.3.1 Concrete slab test members
Concrete slab test members shall contain a reinforcing mesh, which may comprise single reinforcement bars tied
together with lashing wire or a prefabricated "welded fabric" mesh.
The mesh (placed towards the exposed surface and protected by the fire protection material) shall comprise
10,0 mm diameter ribbed bars for the large slab and 8,0 mm diameter ribbed bars for the small slab. The
permitted tolerances on dimensions of reinforcing bars are given in ENV 10080.
For the large slab test member, only an upper mesh, at the unexposed surface, shall be used. It shall comprise
6,0 mm diameter ribbed bars.
Reinforcing bars shall be centred (150 ± 10) mm apart in both directions. The position of the main reinforcing
bars with respect to the exposed and unexposed concrete surfaces shall be ensured by the use of spacers, either
plastic or concrete, such that the concrete cover obtained is (20,0 ± 0,5) mm.
The actual position of the main reinforcing bars at the exposed and unexposed surfaces shall be accurately
measured and recorded after the test at the positions of the thermocouples specified in 9.3. This shall be achieved
by cutting the concrete slab into at least two pieces through or close to the required positions.
6.3.2 Concrete beam test members
Each concrete beam test member shall contain four ribbed reinforcing bars of 12 mm diameter, fixed with
8,0 mm diameter stirrups at (200 ± 10) mm centres. The permitted tolerances on dimensions of reinforcing bars
are given in ENV 10080.
The position of the 12 mm reinforcing bars with respect to the concrete surface shall be ensured by the use of
spacers, either plastic or concrete, such that the concrete cover obtained is (25,0 ± 0,5) mm.
The actual position of the reinforcing bars at the concrete surface shall be accurately measured and recorded after
the test at the positions of the thermocouples specified in 9.3. This shall be achieved by cutting the concrete beam
into at least two pieces through or close to the required positions.
6.3.3 Fabrication of concrete test members
Slab and beam concrete test members shall be prepared in a smooth surfaced framework made from steel or
timber. To facilitate release of the slab or beam from the framework, soluble oils or emulsions shall be used. The
actual material used for this purpose shall be detailed in the test report.
Waxes, insoluble oils or other release agents may be used within this test method but they shall be subject to
restricted application (see 15.10) and each release agent intended to be used shall be separately assessed.
6.3.4 Application of fire protection material to concrete test member
The fire protection material shall be uniformly applied to the concrete, as in practice, including any required
fixing aids, e.g. lathes, meshes and wires or adhesive bond promoters, and in the same manner for both maximum
and minimum fire protection thickness.
The fire protection material shall extend over the full exposed surface(s) of beams and slabs, and be applied prior
to the application of the test load.
Where a fire protection system creates a small cavity between the concrete and the fire protection material, the
ends shall be sealed with fire resistant material to prevent any flow of hot gases out of the cavities.
Fixing profiles for board type fire protection systems can be orientated in both longitudinal and transverse
directions of the test specimen. Fixing profiles orientated in the longitudinal direction, for each line of fixing
profiles, shall include a joint at mid span.
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SIST ENV 13381-3:2003
ENV 13381-3:2002 (E)
Fixing profiles orientated in the transverse direction shall include joints in accordance with the following:
Large slab specimens At least one transverse joint positioned not further than 500 mm from the transverse
axis.
Small slab specimens At least one transverse joint positioned not further than 100 mm from the transverse
axis.
Beams At least one joint shall be positioned at mid-span, or as close to mid-span as is
possible on both sides and base of the beam.
6.4 Composition of test specimen component materials
6.4.1 Concrete
The concrete in the test specimen shall normally be of type 25/30 to 30/37 [LC/C/HC] (light-weight, normal-
weight or heavy-weight concrete) according to EN 206-1 and ENV 1992-1-1, although other grades within the
strength range 20/25 to 50/60 may be used, (see clause 1).
The applicability of the results of the assessment arising from the testing of a particular density, strength or
thickness of concrete will be restricted according to 15.1 to 15.3 and 15.5.
The concrete shall be prepared from silicious aggregates, of maximum aggregate size of 20 mm, and portland
cement. The composition and properties of the concrete used shall be appropriate to those defined in E
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