EN 771-4:2011+A1:2015

SLOVENSKI STANDARD
01-oktober-2015
1DGRPHãþD
SIST EN 771-4:2011
6SHFLILNDFLMD]D]LGDNHGHO=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: Éléments de maçonnerie en
béton cellulaire autoclavé
Ta slovenski standard je istoveten z: EN 771-4:2011+A1:2015
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 771-4:2011+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2015
ICS 91.100.30 Supersedes EN 771-4:2011
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
Éléments de maçonnerie en béton cellulaire autoclavé
This European Standard was approved by CEN on 17 March 2011 and includes Amendment 1 approved by CEN on 11 January 2015.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 771-4:2011+A1:2015 E
worldwide for CEN national Members.

Contents Page
European foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Materials and manufacture .8
4.1 General .8
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 .9
5.3 Configuration . 10
5.4 Density . 11
5.4.1 Gross dry density . 11
5.4.2 Net dry density . 11
5.4.3 Limit deviations . 12
5.5 Compressive strength . 12
5.6 Thermal properties . 12
5.7 Durability . 12
5.8 Moisture movement . 13
5.9 Water vapour permeability . 13
5.10 Water absorption . 13
5.11 Reaction to fire . 13
5.12 Shear bond strength . 13
5.12.1 General . 13
5.12.2 Declaration based on fixed values . 14
5.12.3 Declaration based on tests . 14
5.13 Flexural bond strength . 14
5.14 Dangerous substances . 14
6 Description, designation and classification of AAC masonry units . 14
6.1 Description and designation . 14
6.2 Classification . 15
7 Marking . 15
8 !Assessment and verification of constancy of performance (AVCP)" . 15
8.1 General . 15
8.2 Product type determination . 16
8.3 Factory production control . 17
8.3.1 General . 17
8.3.2 Testing and measuring equipment . 17
8.3.3 Production equipment . 17
8.3.4 Raw materials . 17
8.3.5 Production process . 17
8.3.6 Finished product testing . 18
8.3.7 Statistical techniques . 18
8.3.8 Marking and stock control of products . 18
8.3.9 Traceability . 18
8.3.10 Nonconforming products . 18
Annex A (normative) !Sampling for product type determination test and for independent

testing of consignments" . 19
A.1 General . 19
A.2 Sampling procedure for an assessment of product compliance . 19
A.2.1 Random sampling . 19
A.2.2 Representative sampling . 19
A.2.3 Dividing the sample . 20
A.2.4 Number of masonry units required for testing . 20
Annex B (normative) Cutting schemes . 21
B.1 Cutting scheme for producing cubes or prisms from AAC masonry units in order to

determine the dry density . 21
B.2 Cutting scheme for producing cubes from AAC masonry units in order to determine

compressive strength . 22
Annex C (informative) Guidance on FPC frequencies. 23
Annex ZA (informative) !Clauses of this European Standard addressing the provisions of the

EU Construction Products Regulation" . 25
ZA.1 Scope and relevant characteristics . 25
ZA.2 Procedure(s) for AVCP of Autoclaved Aerated Concrete masonry units . 26
ZA.2.1 System(s) of AVCP . 26
ZA.2.2 Declaration of performance (DoP) . 28
ZA.3 CE marking and labelling. 32
Bibliography . 35

European foreword
This document (EN 771-4:2011+A1:2015) 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 February 2016, and conflicting national standards shall be withdrawn
at the latest by May 2017.
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 771-4:2011".
This document includes Amendment 1 approved by CEN on 2015-01-11.
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association and supports basic requirements for construction works of the EU
Construction Products Regulation (Regulation (EU) No 305/2011).
For relationship with EU Regulation/Directive(s), see informative Annex ZA, which is an integral part of this
document."
This European Standard also takes into account the general rules for reinforced and unreinforced masonry in
Eurocode 6.
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, 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.
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).
!This European Standard includes AAC masonry units with an incorporated insulation not exposed to fire,
and masonry units of an overall rectangular parallelepiped shape, specially shaped and accessory units. AAC
masonry units may consist of layers of different densities where not all of the layers are loadbearing."
!It provides for the assessment and verification of constancy of performance (AVCP) 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
The following referenced documents are indispensable for the application 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 680, Determination of the drying shrinkage of autoclaved aerated concrete
EN 772-1:2011, Methods of test for masonry units ― Part 1: Determination of compressive strength
EN 772-11, Methods of test for masonry units ― Part 11: Determination of water absorption of aggregate
concrete, autoclaved aerated 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 772-16:2011, Methods of test for masonry units ― Part 16: Determination of dimensions
EN 772-20, Methods of test for masonry units ― Part 20: Determination of flatness of faces of aggregate
concrete, manufactured stone and natural stone masonry units
EN 1052-2, Methods of test for masonry ― Part 2: Determination of flexural strength
EN 1052-3, Methods of test for masonry ― Part 3: Determination of initial shear strength
EN 1745, Masonry and masonry products ― Methods for determining thermal properties
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using
data from reaction to fire tests
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 purposes of this document, the following terms and 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 and cured with high pressure steam in autoclaves
Note 1 to entry: AAC masonry units may be provided with recesses, tongued and grooved jointing systems and other
interlocking features and different hollow forms such as units with a ‘U’ shape or with vertical or rectangular perforation."
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
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)
3.15
griphole
hole in a masonry unit to enable it to be more readily grasped and lifted by hand or by machine
3.16
declared value
value that a manufacturer is confident of achieving, bearing in mind the precision of test and variability of the
manufacturing process
3.17
Category I masonry units
units with a declared compressive strength with a probability of failure to reach it not exceeding 5 %
NOTE This may be determined via the mean or characteristic value.
3.18
Category II masonry units
units not intended to comply with the level of confidence of Category I units
3.19
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 EN 772-1:2011, Annex A.
3.20
mean compressive strength of masonry units
arithmetic mean of the compressive strengths of masonry units
3.21
characteristic compressive strength of masonry units
compressive strength corresponding to a 5 % fractile of the compressive strength
3.22
product group
products from one manufacturer having common values for one or more characteristics
3.23
consignment
shipment from the supplier
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 in autoclaves."
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 subclauses relate to !product type determination" (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.
Key
1 Length 3 Height 5 Face
2 Width 4 Bed 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 1 500
Width 600
Height 1 000
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)
AAC units for erection with joints made of:
General purpose and Thin layer mortar
Dimensions
lightweight mortar
GPLM TLMA TLMB
Length +3
± 3 ± 1,5
−5
Height +3
± 2 ± 1,0
−5
Width ± 3 ± 2 ± 1,5
Flatness of bed faces No requirement No requirement ≤ 1,0
Plane parallelism of bed faces No requirement No requirement ≤ 1,0
NOTE Closer tolerances may be declared by the manufacturer for one or more dimensions.
5.2.2.2 Flatness of bed faces
When AAC masonry units category TLMB, intended for use with thin layer mortar, are sampled in accordance
with Annex A and tested in accordance with EN 772-20, the deviation from flatness of the bed faces shall not
exceed the values given in Table 2.
5.2.2.3 Plane parallelism of bed faces
When AAC masonry units category TLMB, intended for use with thin layer mortar, are sampled in accordance
with Annex A and tested in accordance with EN 772-16:2011 by procedure f), the deviation from plane
parallelism shall not exceed the values given in Table 2.
5.2.2.4 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 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.
When relevant to the uses for which the unit is put on the market, the configuration shall be declared.
The declaration may be made by reference to one or another of the groups defined in EN 1996-1-1 or
EN 1996-1-2 and/or it may include one or more items such as those in the following list, as relevant:
— shape and features, including the direction of perforations (by means of a drawing or illustration, when
relevant);
— volume of all formed voids as a percentage of the length × width × height of the unit;
— volume of the largest of any formed voids as a percentage of the length × width × height of the unit;
— volume of grip holes as a percentage of the length × width × height of the unit;
— thickness of webs;
— thickness of shells;
— combined thickness of webs and shells from face to face;
— combined thickness of webs and shells from header to header;
— area of voids on a bed face as a percentage of the length × width of the unit.
When conformity with these configuration requirements cannot be assessed by visual inspection, masonry
units shall be sampled in accordance with A.2, measured in accordance with EN 772-16 and the values
calculated.
5.4 Density
5.4.1 Gross dry density
The gross dry density of an AAC masonry unit shall be declared in kg/m . 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:
— loading;
— airborne sound insulation;
— thermal insulation;
— fire resistance.
In addition, the manufacturer may declare the minimum and maximum individual values of gross dry density.
5.4.2 Net dry density
When relevant to the uses for which AAC units are put on the market, the manufacturer shall declare the net
dry density of AAC masonry unit in kg/m . 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 less than 1 000 kg/m ."
In addition, the manufacturer may declare the minimum and maximum individual values of net dry density.
5.4.3 Limit deviations
The limit deviation of the measured dry density from the declared dry density shall not exceed ± 50 kg/m .
NOTE Closer deviations may be declared.
5.5 Compressive strength
The strength of the masonry units in compression shall be declared in N/mm by the manufacturer and shall
not be less than 1,5 N/mm !for loadbearing masonry" (declared value — for definition, see 3.16). 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 ZA.2). If AAC masonry units are sampled from a consignment in accordance
with Annex A and tested in accordance with EN 772-1 the compressive strength shall not be less than the
declared value and no individual masonry unit measured within the test sample shall have a compressive
strength of less than 80 % of the mean declared value or 90 % of the characteristic declared value. When
units are conditioned in accordance with EN 772-1:2011, 7.3.3 b) the values shall be brought to the air dry
condition in accordance with EN 772-1:2011, Annex A."
When not using whole masonry units, refer to B.2 for the cutting scheme. The dimensions of such specimens
shall be declared.
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 the mean λ -value and the
10,dry,unit
determination model as prescribed in EN 1745, or alternatively the unit density and configuration, shall be
provided.
Additionally another fractile may be provided. In such cases both the additional fractile and the corresponding
-value shall be given.
λ
10,dry,unit
When autoclaved aerated concrete masonry units are sampled in accordance with Annex A and tested in
accordance with EN 1745 following the model provided, the λ-value of the specified number of autoclaved
aerated concrete masonry units shall not be greater than the λ-value provided.
When relevant to the uses for which the units are put on the market, the value of the specific heat capacity of
the units given in EN 1745 may be provided.
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 !placed" 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 min, 30 min and 90 min shall be declared by the manufacturer. If sampled in accordance with Annex A and
tested in accordance with EN 772-11 the results shall be less than those declared by the manufacturer. The
measuring periods shall be 10 min, 30 min 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 !AAC masonry" 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.
Information on reaction to fire class of supplementary insulating material shall be given on the basis of
European Standards as declared by the supplier of the insulating material.
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.
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 998-2:2010, Annex C.
5.12.3 Declaration based on tests
The characteristic initial shear strength of the unit in combination with one or more specific mortars in
accordance with EN 998-2 may be declared based on tests on masonry units sampled 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.
5.13 Flexural bond strength
When relevant for the intended place of use and the intended application, the flexural bond strength of units
and mortar shall be declared. The declaration shall give the characteristic flexural strength of the masonry
either in the plane of failure perpendicular to the bed joints or the plane of failure parallel to the bed joints or
both, as relevant together with the mortar specification for which the declaration is valid.
When autoclaved aerated concrete masonry units are sampled in accordance with Annex A and tested in
accordance with EN 1052-2, the characteristic flexural strength shall not be less than the value declared.
!
5.14 Dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and
sometimes content, when construction products covered by this standard are placed on those markets.
In the absence of European harmonized test methods, verification and declaration on release/content should
be done taking into account national provisions in the place of use.
NOTE An informative database covering European and national provisions on dangerous substances is available at
the Construction web site on EUROPA accessed through: http://ec.europa.eu/enterprise/construction/cpd-ds/."
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 Standard;
b) manufactured dimensions and tolerances for use with general purpose, thin layer or lightweight mortars
(see 5.2);
c) configuration including shape and features and if the unit is Group 1 structural (see 5.3);
d) compressive strength (see 5.5);
e) dry density (see 5.4).
the
When relevant to the uses for which the unit is placed on the market, the manufacturer may include
description and designation of any of the following:

f) material related properties;
g) shape related properties;
h) durability;
i) intended use;
j) other properties.
!NOTE Refer to clause ZA.3 for (CE) marking."
6.2 Classification
Specification of the properties of units may be given by reference to classification systems provided those
systems are based only on single properties included in this standard and do not themselves constitute a
barrier to trade.
This does not remove the requirement that all manufacturers claiming compliance with this standard shall
state declared values of the properties of their products, when required.
7 Marking
The particulars below shall be clearly marked on one of the following: the units, the packaging, the delivery
note or any certificate supplied with the masonry units.
a) Name, trademark or other means of identification of the manufacturer of the unit;
b) Date of manufacture (this item is optional);
c) Means of identifying the masonry units and relating them to their description and designation.
NOTE For CE marking and labelling, see Annex ZA. Where ZA.3 requires the CE-marking to be accompanied by the
same information as required by this clause, the requirements of this clause can be considered to have been met.
8 !Assessment and verification of constancy of performance (AVCP)"
8.1 General
!The manufacturer shall demonstrate compliance of this product with the requirements of this European
Standard and with the declared performance for the product properties by carrying out both:
— product type determination (see 8.2), which can be physical testing, calculation, reference to tabulated
values or combinations of these methods;
— factory production control (see 8.3).
Alternative methods of test to the reference methods in this European Standard may be adopted except for
the product type determination tests and in case of dispute, provided that these alternative methods satisfy the
following:
a) a relationship can be shown to exist between the results from the test and those from alternative test;
b) a safe relationship can be demonstrated when using the alternative method compared to the reference
methods and
c) the information on which the relationship is based is available for inspection."
!
8.2 Product type determination
After completion of the development of a new product type and before placing on the market, appropriate
product type determination tests shall be carried out to confirm that the achieved properties of the product
meet the requirements of this standard and the performance of the characteristics to be declared for it by the
manufacturer.
Whenever a major change in the source, blend, or nature of raw materials occurs, or when there is a change
in processing conditions, leading to what the manufacturer considers will constitute a new product type being
produced, the appropriate product type determination shall be repeated.
The manufacturer may define product groups. The product group may differ according to the characteristics in
question.
In the product type determination process a manufacturer may take in consideration already existing results.
A manufacturer may use the product type determination results determined by someone else (e.g. another
manufacturer or a research, technology & development service provider) to justify his own declaration of
performance regarding a product that is manufactured according to the same design and with raw materials,
constituents and manufacturing methods of the same kind, provided that permission is given by the owner of
the results, and the results are valid for both products.
The tests to be conducted shall be the tests or calculations as described in Table A.1 for the properties
selected from the following list relevant to the manufacturer’s declaration for the product types intended use.
— Dimensions;
— Gross dry density;
— Net dry density;
— Compressive strength;
— Moisture movement;
— Thermal properties;
— Bond strength;
— Water vapour permeability;
— Water absorption;
— Reaction to fire;
— Durability.
Sampling for product type determination shall be in accordance with Annex A.
The results of the type tests shall be recorded.
NOTE For the performance characteristics to be determined in order to address the Declaration of Performance and
CE marking provisions, see Table ZA.1."
8.3 Factory production control
8.3.1 General
The manufacturer shall establish, document and maintain a factory production control system to enable
continuing conformity with this European Standard and the declared !performance of the characteristics"
of the products placed on the market.
The factory production control system may consist of procedures related to the process only (full process
control and consequently no finished product testing, i.e. 8.3.6 does not apply), to finished products only
(consequently no process control, i.e. 8.3.5 does not apply) or any combination of both. Consequently
conformity criteria depend on the individual factory production procedures.
As appropriate, the responsibility, authority and interrelation of all personnel who manage, perform and verify
work affecting the quality of masonry unit products shall be established.
The factory production control system shall describe the control procedure of production, the regular checks
by the manufacturer and his testing, depending on the combination of the procedures related to process
control and/or finished product testing. Controls and tests may include the characteristics of raw materials and
finished products, the procedure of producti
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