SIST EN 771-4:2004
(Main)Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
This EN specifies the characteristics and performance requirements of autoclaved aerated concrete (AAC) masonry units for which the main intended uses are different types of loadbearing and non-loadbearing applications in all forms of walling including single leaf, cavity, partitions, retaining, basement and general use below ground level, including walling for fire protection, thermal insulation, sound insulation and chimneys.
Festlegungen für Mauersteine - Teil 4: Porenbetonsteine
Diese Europäische Norm beschreibt die Eigenschaften und Leistungsanforderungen für dampfgehärtete Porenbetonsteine, die vorwiegend in tragendem oder nichttragendem Mauerwerk in Bauwerken des Hoch- oder Tiefbaus verwendet werden. Die hierin beschriebenen Mauersteine eignen sich für alle Arten von Mauerwerk einschließlich einschaligen Mauerwerks, zweischaligen Mauerwerks, Trennwänden, Stützmauern und Fundamenten sowie für die allgemeine Verwendung unter der Erdoberfläche. Sie dienen dem Brand-, Wärme- und Schallschutz. Sie werden auch zur Herstellung von Schornsteinmauerwerk (ausgenommen bei der Auskleidung von Rauchabzügen) verwendet.
Diese Norm beschreibt die Anforderungen, z.B. an Festigkeit, Rohdichte und Maßgenauigkeit. Ferner werden die Konformitätsbewertung und die Kennzeichnung der von dieser Europäischen Norm erfassten Produkte festgelegt.
Diese Europäische Norm gilt nicht für geschosshohe Tafeln, Steine für die Auskleidung von Rauchabzügen oder für Steine zur Herstellung von feuchtesperrenden Schichten. Sie gilt nicht für Steine mit einem Wärmedämmstoff, der auf die Seiten des Steins, die Feuer ausgesetzt sein können, aufgebracht ist. Sie gibt weder genormte Größen für Porenbetonsteine noch Sollmaße und Winkel für Form- und Ergänzungssteine an. Sie enthält keine Grenzabmaße für Form- und Ergänzungssteine. Produkte zur Herstellung von feuchtesperrenden Schichten oder zur Auskleidung von Schornsteinen werden nicht behandelt.
Spécifications pour éléments de maçonnerie - Partie 4: Eléments de maçonnerie en béton cellulaire autoclavé
Cette Norme européenne spécifie les caractéristiques et les exigences de performances des blocs de maçonnerie en béton cellulaire autoclavé (BCA) dont les principales utilisations prévues sont différents types d'applications porteuses et non porteuses sous toutes les formes de murs, y compris les murs a simple ou double paroi, les cloisons, les murs de soutenement, les soubassements et les murs utilisés en sous-sol. Ils peuvent constituer une protection contre l'incendie, une isolation thermique et acoustique et un chemisage pour les conduits de fumée (excepté pour les conduits intérieurs de fumée).
Elle définit d'une part les performances relatives par exemple a la résistance, la masse volumique et les tolérances dimensionnelles et permet d'autre part d'évaluer la conformité du produit par rapport a cette Norme Européenne.
Elle inclut également les exigences de marquage des produits qui y sont traités.
Cette Norme européenne ne couvre pas les exigences concernant les panneaux hauteur d'étage, les conduits intérieurs de fumée ni les blocs comportant un isolant thermique rapporté sur les faces susceptibles d'etre exposées au feu. Elle ne spécifie pas les formats normalisés des blocs en béton cellulaire autoclavé, les dimensions de fabrication courante, ni les caractéristiques angulaires des blocs de forme particuliere et des blocs accessoires. Elle ne donne pas les tolérances dimensionnelles pour les blocs de forme particuliere et les blocs accessoires. Elle ne couvre pas les produits destinés a servir d'assise anti-humidité ou de conduits intérieurs de fumée.
Specifikacija za zidake – 4. del: Zidaki iz avtoklaviranega celičnega betona
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 771-4:2004
01-januar-2004
1DGRPHãþD
SIST EN 771-4:2000
6SHFLILNDFLMD]D]LGDNH±GHO =LGDNLL]DYWRNODYLUDQHJDFHOLþQHJDEHWRQD
Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
Festlegungen für Mauersteine - Teil 4: Porenbetonsteine
Spécifications pour éléments de maçonnerie - Partie 4: Eléments de maçonnerie en
béton cellulaire autoclavé
Ta slovenski standard je istoveten z: EN 771-4:2003
ICS:
91.100.30
SIST EN 771-4:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 771-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2003
ICS 91.100.30 Supersedes EN 771-4:2000
English version
Specification for masonry units - Part 4: Autoclaved aerated
concrete masonry units
Spécifications pour éléments de maçonnerie - Partie 4: Festlegungen für Mauersteine - Teil 4: Porenbetonsteine
Eléments de maçonnerie en béton cellulaire autoclave
This European Standard was approved by CEN on 9 April 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, 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
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 771-4:2003 E
worldwide for CEN national Members.
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EN 771-4:2003 (E)
Contents Page
Foreword .4
1 Scope.5
2 Normative references.5
3 Terms and definitions.6
4 Materials and manufacture.7
4.1 General .7
4.2 Materials of manufacture.8
5 Requirements for AAC masonry units.8
5.1 General .8
5.2 Dimensions and tolerances .8
5.2.1 Dimensions .8
5.2.2 Tolerances .10
5.3 Configuration.10
5.4 Density .10
5.4.1 Gross dry density.10
5.4.2 Net dry density .11
5.4.3 Limit deviations.11
5.5 Compressive strength .11
5.6 Thermal properties.12
5.7 Durability.12
5.8 Moisture movement .12
5.9 Water vapour permeability .12
5.10 Water absorption.12
5.11 Reaction to fire .12
5.12 Shear bond strength .13
5.12.1 General .13
5.12.2 Declaration based on fixed values .13
5.12.3 Declaration based on tests .13
5.13 Flexural bond strength .13
6 Description, designation and classification of AAC masonry units.13
6.1 Description and designation.13
6.2 Classification.14
7 Marking.14
8 Evaluation of conformity .14
8.1 General .14
8.2 Initial type tests .15
8.3 Factory production control .15
8.3.1 General .15
8.3.2 Raw materials .16
8.3.3 Production process.16
8.3.4 Finished product testing .16
8.3.5 Stock control .16
Annex A (normative) Sampling for initial type testing and for independent testing of
consignments.17
A.1 General .17
A.2 Sampling procedure for an assessment of product compliance.17
A.2.1 Random sampling .17
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EN 771-4:2003 (E)
A.2.2 Representative sampling.17
A.2.3 Dividing the sample .18
A.2.4 Number of units required for testing.18
Annex B (normative) Cutting schemes .19
B.1 Cutting scheme for producing cubes or prisms from AAC masonry units in order
to determine the dry density. .19
B.2 Cutting scheme for producing cubes from AAC masonry units in order to
determine compressive strength.20
Annex ZA (informative) Clauses of this European Standard addressing the provisions of
the EU Construction Products Directive .21
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EN 771-4:2003 (E)
Foreword
This document (EN 771-4:2003) has been prepared by Technical Committee CEN/TC 125 "Masonry",
the secretariat of which is held by BSI.
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 2004, and conflicting national standards
shall be withdrawn at the latest by April 2005.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association and supports the essential requirements of the EU Construction
Products Directive (89/106/EEC).
For relationship with EU Directive(89/106/EEC), see informative Annex ZA which is an integral part of
this standard.
It also takes into account the general rules for unreinforced and reinforced masonry in Eurocode 6.
The Annexes A and B of this European Standard are normative.
This European Standard replaces EN 771-4:2000.
EN 771, Specification for masonry units consists of:
Part 1: Clay masonry units.
Part 2: Calcium silicate masonry units.
Part 3: Aggregate concrete masonry units (Dense and light-weight aggregates).
Part 4: Autoclaved aerated concrete masonry units.
Part 5: Manufactured stone masonry units.
Part 6: Natural stone masonry units.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg,
Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United
Kingdom.
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EN 771-4:2003 (E)
1 Scope
This European Standard specifies the characteristics and performance requirements of autoclaved
aerated concrete (AAC) masonry units for which the main intended uses are different types of load
bearing and non-load bearing applications in all forms of walling including single leaf, cavity,
partitions, retaining, basement and general use below ground level, including walling for fire
protection, thermal insulation, sound insulation and the fabric of chimneys (excluding chimney flue
units).
It defines the performance related to e.g. strength, density, dimensional accuracy etc. and provides
for the evaluation of conformity of the product to this European Standard.
The marking requirement for products covered by this European Standard is included.
This European Standard does not cover the requirements for storey height panels, flue linings and
masonry units with an incorporated thermal insulation material bonded to the faces of the unit
susceptible to be exposed to fire. It does not specify standard sizes for autoclaved aerated concrete
units nor standard work dimensions and angles of specially shaped and accessory units. It does not
give permissible deviations for specially shaped and accessory units. It does not cover products
intended for use as a damp proof course or the lining of a chimney.
2 Normative references
This European Standard 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 Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
EN 680, Determination of the drying shrinkage of autoclaved aerated concrete
EN 772-1:2000, Methods of test for masonry units — Part 1: Determination of compressive strength
EN 772-10, Methods of test for masonry units — Part 10: Determination of moisture content of
calcium silicate and autoclaved aerated concrete units
EN 772-11, Methods of test for masonry units — Part 11: Determination of water absorption of
aggregate concrete, manufactured stone and natural stone masonry units due to capillary action and
the initial rate of water absorption of clay masonry units
EN 772-13, Methods of test for masonry units — Part 13: Determination of net and gross dry density
of masonry units (except for natural stone)
EN 772-16, Methods of test for masonry units — Part 16: Determination of dimensions
EN 998-2:2001, Specification for mortar for masonry — Part 2: Masonry mortar
EN 1052-3, Methods of test for masonry — Part 3: Determination of initial shear strength
EN 1745, Masonry and masonry products — Methods for determining design thermal values
EN 13501-1, Fire classification of construction products and building elements —
Part 1: Classification using test data from reaction to fire tests
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EN 771-4:2003 (E)
EN ISO 12572, Hygrothermal performance of building materials and products -Determination of water
vapour transmission properties (ISO 12572:2001)
3 Terms and definitions
For the purpose of this European standard, the following definitions apply.
3.1
masonry unit
preformed component intended for use in masonry construction
3.2
autoclaved aerated concrete (AAC) masonry unit
masonry unit manufactured from hydraulic binders such as cement and/or lime, combined with
siliceous based fine material, cell generating material and water
NOTE AAC masonry units may be provided with recesses, tongued and grooved jointing systems and other
interlocking features.
3.3
co-ordinating size
size of the co-ordinating space allocated to a masonry unit including allowances for joints and
tolerances
3.4
work size
size of masonry unit specified for its manufacture, to which the actual size conforms within permissible
deviations
3.5
actual size
size of a masonry unit as measured
3.6
regular shaped masonry unit
masonry unit with an overall rectangular parallelepiped shape
3.7
specially shaped masonry unit
masonry unit which is not a rectangular parallelepiped
3.8
accessory unit
masonry unit which is shaped to provide a particular function
3.9
interlocking features
shaped matched projections and indentations on masonry units, e.g. tongue and groove systems
3.10
hole
formed void which may or may not pass completely through a masonry unit
3.11
vertical perforation
formed void which passes completely through a masonry unit perpendicular to the bed face
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EN 771-4:2003 (E)
3.12
horizontal perforation
formed void which passes completely through a masonry unit parallel to the bed faces
3.13
cell
formed void which does not pass through a masonry unit
3.14
recess
depression or indentation in one or more surfaces of a masonry unit (e.g. mortar pocket, rendering
keyway, grip hole)
3.15
declared value
value that a manufacturer is confident of achieving, bearing in mind the precision of test and variability
of the manufacturing process
3.16
Category I masonry units
units with a declared compressive strength with a probability of failure to reach it not exceeding 5 %.
This may be determined via the mean or characteristic value
3.17
Category II masonry units
units not intended to comply with the level of confidence of Category I units
3.18
normalised compressive strength of masonry units
compressive strength of masonry units converted to the air dry compressive strength of an equivalent
100 mm wide by 100 mm high masonry unit
NOTE See procedure given in Annex A of EN 772-1:2000
3.19
mean compressive strength of masonry units
arithmetic mean of the compressive strengths of masonry units
3.20
characteristic compressive strength of masonry units
compressive strength corresponding to a 5 % fractile of the compressive strength
4 Materials and manufacture
4.1 General
AAC masonry units shall be manufactured using hydraulic binders such as cement and/or lime
combined with fine siliceous based material, cell-generating material and water and cured with high
pressure steam in autoclaves.
NOTE The raw materials are mixed together and cast into moulds where the mix is allowed to rise and set
into cakes. After this part of the process, the cake is cut into the required sizes of masonry units and cured.
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EN 771-4:2003 (E)
4.2 Materials of manufacture
The following materials of manufacture combined with additives and agents where appropriate, may
be used in the manufacturing process:
Siliceous based material;
Cement;
Lime;
Water;
Cell-generating material.
Other materials may also be included in the manufacturing process.
5 Requirements for AAC masonry units
5.1 General
The requirements and properties specified in this standard shall be defined in terms of test methods
and other procedures referred to in this European Standard.
It should be noted that the test methods are not always applicable to specially shaped and accessory
units (see 3.7 and 3.8).
The conformity criteria given in the following sub-clauses relates to initial type testing (see 8.2) and,
when relevant, to consignment testing (see Annex A). For the compressive strength of Category I
units use a 50 % fractile (p = 0,50) for mean values or 5 % fractile (p = 0,05) for characteristic values
and a confidence level of 95 %.
For production evaluation the manufacturer shall define the conformity criteria in the factory
production control documentation, see 8.3.
5.2 Dimensions and tolerances
5.2.1 Dimensions
The manufactured dimensions of an AAC masonry unit shall be declared in mm for length, width and
height, in that order.
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EN 771-4:2003 (E)
4
2
6
3
5
1
Key
1 Length 2 Width 3 Height
4 Bed 5 Face 6 Header
NOTE This relates to the normal use of the masonry unit in the wall.
Figure 1 — Dimensions and surfaces
They shall be given in terms of work size.
NOTE In addition the co-ordinating size may be given.
AAC masonry units shall be sampled in accordance with Annex A and tested in accordance with
EN 772-16.
The deviation of the measured dimensions from the declared dimensions shall not exceed the value
given in Table 2. The declared dimensions shall not exceed the value given in Table 1.
Table 1 — Maximum dimensions for AAC
masonry units
Dimensions in millimetres
Length 1500
Width 600
Height 1000
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EN 771-4:2003 (E)
5.2.2 Tolerances
5.2.2.1 Permissible deviations for regular shaped units
The permissible deviations for individual masonry units shall be as given in Table 2 for mortar
specified in accordance with EN 998-2.
Table 2 — Limit deviations for regular shaped units in millimetres
Dimensions AAC units for erection with joints made of:
General purpose and Thin layer mortar
lightweight mortar TLMA TLMB
Length +3
-5 ± 3 ± 3
Height +3
-5 ±2 ± 1
Width
± 3 ± 2 ± 2
NOTE Closer tolerances may be declared by the manufacturer for one or more dimensions.
5.2.2.2 Permissible deviations for other shaped units
The permissible deviations for non-regular units are not specified in this standard.
5.3 Configuration
For plain regular shaped units it is not necessary to specify the shape. For other units, the geometry
of the unit and the volume, direction and shape of perforation and holes shall be declared using
definitions in clause 3 or by reference to a drawing.
NOTE 1 AAC masonry units are generally used in conjunction with general purpose, thin layer and
lightweight mortars. The following are commonly employed:
a) Mortar joints between plain rectangular shaped AAC masonry units;
b) Tongued and grooved jointing systems using tongued and grooved AAC masonry units;
c) Mortar joints between profiled AAC masonry units where the profile is designed to accommodate mortar.
NOTE 2 The manufacturer may also declare, whether the units comply with the limits for one or another of
the groups specified in relevant parts of Eurocode 6.
5.4 Density
5.4.1 Gross dry density
The gross dry density of an AAC masonry unit shall be declared in kg/m³. For all plain regular shaped
masonry units, the mean gross dry density of AAC masonry units shall be determined in accordance
with EN 772-13 from units sampled in accordance with Annex A. When not using whole masonry
units, these shall be prepared in accordance with Annex B.
NOTE This declaration may be made for the evaluation of
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EN 771-4:2003 (E)
loading;
airborne sound insulation;
thermal insulation;
fire resistance.
5.4.2 Net dry density
When relevant to the uses for which the unit is put on the market and in all cases for units to be used
in elements subject to acoustic requirements, the manufacturer shall declare the net dry density of an
AAC masonry unit in kg/m³. For units other than plain regular shaped units, the mean net dry density
of AAC masonry units shall be determined in accordance with EN 772-13 from units sampled in
accordance with Annex A. When not using whole masonry units, these shall be prepared in
accordance with Annex B.
NOTE The net density of AAC masonry units is normally within the range 300 kg/m³ to 1000 kg/m³.
5.4.3 Limit deviations
The limit deviation of the measured dry density from the declared dry density shall not exceed
± 50 kg/m³.
NOTE Closer deviations may be declared.
5.5 Compressive strength
The strength of the masonry units in compression shall be declared in N/mm² by the manufacturer
and shall not be less than 1,5 N/mm² (declared value - for definition see 3.15) It shall be expressed as
one of:
a) the mean compressive strength of the unit;
b) the characteristic compressive strength of the unit.
The manufacturer shall also declare the normalised compressive strength when relevant. EN 772-1
gives instructions on how to convert the declared compressive strength into the normalised
compressive strength.
In addition, the manufacturer shall declare whether the autoclaved aerated concrete masonry unit is
Category I or Category II (see clause ZA.2). If AAC masonry units are sampled from a consignment
in accordance with Annex A and tested in accordance with EN 772-1, with surface preparation and
conditioning as given below, the compressive strength shall not be less than the declared value and
no individual AAC masonry unit shall have a compressive strength of less than 80 % of the mean
declared value or 90 %of the characteristic declared value.
The specimens sampled in accordance with Annex A shall be conditioned to 6 % ± 2 % moisture
content in accordance with 7.3.4 of EN 772-1: 2000. The moisture content of the specimens shall be
determined in accordance with EN 772-10. The surfaces of the specimens shall be prepared in
accordance with 7.2.4 of EN 772-1: 2000.
When not using whole masonry units refer to clause B.2 for the cutting scheme. The dimensions of
such specimens shall be declared.
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EN 771-4:2003 (E)
5.6 Thermal properties
When relevant to the uses for which the unit is put on the market and in all cases for units intended to
be used in elements subject to thermal requirements, the manufacturer shall provide information on
the thermal properties of AAC masonry units by reference to EN 1745.
5.7 Durability
When relevant to the uses for which the units are put on the market, the manufacturer shall evaluate
and declare the freeze/thaw resistance of the units by reference to the provisions valid in the intended
place of use of the units until an appropriate European Standard is available.
5.8 Moisture movement
When relevant to the uses for which the unit is put on the market and in all cases for units intended to
be used in elements subject to structural requirements, the shrinkage of AAC masonry units shall be
determined in accordance with EN 680 from units sampled in accordance with Annex A.
5.9 Water vapour permeability
When relevant to the uses for which the masonry unit is put on the market and in all cases for units
intended to be used in external elements, the manufacturer shall provide information on the water
vapour permeability through the water vapour diffusion coefficient tabulated values given in EN 1745
or determined in accordance with EN ISO 12572.
5.10 Water absorption
When relevant to the uses for which the unit is put on the market and for all units intended to be used
in external elements with exposed face, the maximum water absorption of masonry units at times of
10, 30 and 90 min shall be declared by the manufacturer. If sampled in accordance with Annex A and
tested in accordance with EN 772-11, using the procedure for aggregate concrete units and a drying
temperature of 70 °C ± 5 °C, the results shall be less than those declared by the manufacturer. The
measuring periods shall be 10, 30 and 90 min.
The samples shall be prepared as three cubes cut from units in accordance with Annex B.
5.11 Reaction to fire
For units intended to be used in elements subject to fire requirements the manufacturer shall declare
the reaction to fire classification of the masonry unit.
For masonry units containing a mass or volume fraction of £ 1,0 % (whichever is the most onerous) of
homogeneously distributed organic materials the declaration may be fire Class A1 without the need to
test.
Masonry units containing a mass or volume fraction of > 1,0 % (whichever is the most onerous) of
homogeneously distributed organic materials shall be classified in accordance with EN 13501-1 and
the appropriate reaction to fire class declared.
NOTE Attention is drawn to the Commission Decision 96/603/EC, amended by Decision 2000/605/EC, in
which non-combustible masonry units containing not more than a mass or volume fraction of 1,0 %
(whichever is the more onerous) of homogeneously distributed organic materials are classified as reaction to
fire Class A1 without testing.
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EN 771-4:2003 (E)
5.12 Shear bond strength
5.12.1 General
For autoclaved aerated concrete masonry units intended to be used in elements subjected to
structural requirements the bond strength of the unit in combination with mortar shall be declared in
terms of the characteristic initial shear strength in accordance with EN 1052-3. The declaration may
be made either on the basis of fixed values as in 5.12.2 below, or tests as in 5.12.3 below. The
manufacturer shall declare whether the value of bond strength has been obtained from the fixed
values or from test.
NOTE In most cases it is expected that the use of fixed values will be sufficient.
5.12.2 Declaration based on fixed values
When no declaration is made in accordance with 5.12.2 the characteristic initial shear strength of the
unit in combination with mortar may be declared by reference to EN 998-2:2003, Annex C.
5.12.3 Declaration based on tests
The characteristic initial shear strength of the unit in combination with a specific type of mortar
specified in accordance with EN 998-2 may be declared based on tests on masonry units sampled
from a consignment in accordance with Annex A and tested in accordance with EN 1052-3. The
characteristic initial shear strength shall not be less than the declared value.
NOTE Bond strength depends on the mortar, the masonry unit and the workmanship.
Flexural bond strength
5.13
When required by national provisions valid in the intended place of use and relevant to the
application, the flexural bond strength of masonry units, in combination with mortar, shall be evaluated
and declared.
6 Description, designation and classification of AAC masonry units
6.1 Description and designation
The description and designation of the AAC masonry unit shall comprise at least the following:
a) the number and date of issue of this European Stand
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