EN 771-2:2003

SLOVENSKI STANDARD
01-januar-2004
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SIST EN 771-2:2000
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Specification for masonry units - Part 2: Calcium silicate masonry units
Festlegungen für Mauersteine - Teil 2: Kalksandsteine
Spécifications pour éléments de maçonnerie - Partie 2 : Éléments de maçonnerie en
silico-calcaire
Ta slovenski standard je istoveten z: EN 771-2:2003
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 771-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2003
ICS 73.020; 91.100.15 Supersedes EN 771-2:2000
English version
Specification for masonry units - Part 2: Calcium silicate
masonry units
Spécifications pour éléments de maçonnerie - Partie 2: Festlegungen für Mauersteine - Teil 2: Kalksandsteine
Eléments de maçonnerie en silico-calcaire
This European Standard was approved by CEN on 2 October 2002.
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 771-2:2003 E
worldwide for CEN national Members.

Contents
Foreword .3
1 Scope.4
2 Normative references.4
3 Terms and definitions.5
4 Materials and manufacture.7
5 Requirements for calcium silicate masonry units.7
5.1 General .7
5.2 Dimensions and tolerances .7
5.3 Configuration.9
5.4 Dry density.9
5.5 Compressive strength .10
5.6 Thermal properties.10
5.7 Durability.10
5.8 Water vapour permeability .11
5.9 Reaction to fire .11
5.10 Water absorption.11
5.11 Moisture movement .12
5.12 Bond strength.12
6 Description, designation and classification of calcium silicate masonry units.12
6.1 Description and designation.12
6.2 Classification.13
7 Marking.13
8 Evaluation of conformity .13
8.1 General .13
8.2 Initial type tests .14
8.3 Factory production control .14
Annex A (normative) Sampling for initial type testing and for independent testing of
consignments.16
Annex B (normative) Cutting schemes .19
Annex C (normative) Tolerances on accessory units.21
Annex D (informative) Classification systems.25
Annex ZA (informative) Clauses of this European standard addressing the provisions of
the EU Construction Products Directive .27
Foreword
This document (EN 771-2:2003) 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 October 2003, and conflicting national standards
shall be withdrawn at the latest by January 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(s), see informative annex ZA, which is an integral part of this
document.
It also takes into account the general rules for reinforced and unreinforced masonry in Eurocode 6.
The annexes A, B and C of this documentare normative, the annexes D and ZA are informative.
This document supersedes EN 771-2:2000.
EN 771 Specification for masonry units consists of:
 Part 1: Clay masonry units
 Part 2: Calcium silicate masonry units
 Part 3: Aggregates 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.
1 Scope
This document specifies the characteristics and performance requirements of calcium silicate
masonry units for which the main intended uses are inner walls, outer walls, cellars, foundations and
external chimneymasonry.
This document is intended to apply to all calcium silicate masonry units, including those of an overall
nonrectangular parallelepiped shape, specially shaped and accessory units.
It defines the performance related to e.g. strength, density and dimensional accuracy, measured
according to the corresponding test methods contained in separate European Standards.
It provides for the evaluation of conformity of the product to this European Standard. The marking
requirement for products covered by this document is also included.
This document does not specify standard sizes for calcium silicate masonry units, nor standard work
dimensions and angles of specially shaped and accessory units.
It does not cover units with more than 60 % volume of voids, nor products made from shale as a
major raw material.
It does not cover storey height panels.
It does not cover units intended for use as a damp proof course, nor units with an incorporated
thermal insulation material bonded to the faces of the unit susceptible to be exposed to fire nor
chimney flue units.
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 772-1:2000, Methods of test for masonry units — Part 1: Determination of compressive strength
EN 772-9, Methods of test for masonry units — Part 9: Determination of volume and percentage of
voids and net volume of calcium silicate units by sand filling
EN 772-13:2000, Methods of test for masonry units — Part 13: Determination of net and gross dry
density of masonry units (except for natural stone)
EN 772-16:2000, Methods of test for masonry units — Part 16: Determination of dimensions
EN 772-18:2000, Methods of test for masonry units — Part 18: Determination of freeze/thaw
resistance of calcium silicate masonry units
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 ISO 12572, Hygrothermal performance of building materials and products Determination of water
vapour transmission properties (ISO 12572:2001)
EN 13501-1, Fire classification of construction products and building elements —
Part 1: Classification using test data from reaction to fire tests
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
masonry unit
preformed component intended for use in masonry construction
3.2
calcium silicate masonry unit
masonry unit made predominantly from lime and siliceous materials, hardened by high pressure
steam
3.3
shale
fine grained sedimentary rock, finely laminated and consisting of mainly quartz and clay minerals
3.4
co-ordinating size
size of the co-ordinating space allocated to a masonry unit including allowances for joints and
tolerances
3.5
work size
size of a masonry unit specified for its manufacture, to which the actual size conforms within
permissible deviations
3.6
actual size
size of a masonry unit as measured
3.7
regular shaped masonry unit
masonry unit with an overall rectangular parallelepiped shape
3.8
specially shaped masonry unit
masonry unit which is not a rectangular parallelepiped
3.9
accessory unit
masonry unit which is shaped to provide a particular function, e.g. to complete the geometry of the
masonry. It may be obtained by cutting a large unit
3.10
interlocking feature
shaped matched projections and indentations on masonry units, e.g. tongue and groove systems
3.11
hole
formed void which may or may not pass completely through a masonry unit
3.12
perforation
formed void which passes completely through a masonry unit
3.13
cell
formed void which does not pass through a masonry unit
3.14
frog
depression formed in one or both faces of a unit, the total volume of all such depressions which does
not exceed a certain limit of the overall volume of the unit i.e. length · width · height
3.15
recess
a depression or indentation in one or more surfaces of a masonry unit (e.g. mortar pocket, rendering
keyway, grip hole)
3.16
shell
peripheral material between the hole(s) and the outer surfaces of a masonry unit
3.17
web
solid material between the holes in a masonry unit
3.18
normalized compressive strength of masonry units
compressive strength of masonry units converted to the air dry compressive strength of an equivalent
100 mm wide and 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 the 5 % fractile of the compressive strength of masonry units
3.21
declared value
value that a manufacturer is confident of achieving, bearing in mind the precision of the test and the
variability of the manufacturing process
3.22
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
3.23
Category II masonry units
units not intended to comply with the level of confidence of Category I units
4 Materials and manufacture
Calcium silicate masonry units are produced predominantly from a mixture of l
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