EN 772-1:2011
(Main)Methods of test for masonry units - Part 1: Determination of compressive strength
Methods of test for masonry units - Part 1: Determination of compressive strength
This European Standard specifies a method for determining the compressive strength of masonry units.
Prüfverfahren für Mauersteine - Teil 1: Bestimmung der Druckfestigkeit
Diese Europäische Norm legt ein Verfahren zur Bestimmung der Druckfestigkeit von Mauersteinen fest.
Méthodes d'essai des éléments de maçonnerie - Partie 1: Détermination de la résistance à la compression
La présente Norme européenne spécifie une méthode permettant de déterminer la résistance à la compression des éléments de maçonnerie.
Metode preskušanja zidakov - 1. del: Določevanje tlačne trdnosti
Ta evropski standard določa metodo za določevanje tlačne trdnosti zidakov.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2011
1DGRPHãþD
SIST EN 772-1:2002
0HWRGHSUHVNXãDQMD]LGDNRYGHO 'RORþHYDQMHWODþQHWUGQRVWL
Methods of test for masonry units - Part 1: Determination of compressive strength
Prüfverfahren für Mauersteine - Teil 1: Bestimmung der Druckfestigkeit
Méthodes d'essai des éléments de maçonnerie - Partie 1: Détermination de la résistance
à la compression
Ta slovenski standard je istoveten z: EN 772-1:2011
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 772-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2011
ICS 91.100.25 Supersedes EN 772-1:2000
English Version
Methods of test for masonry units - Part 1: Determination of
compressive strength
Méthodes d'essai des éléments de maçonnerie - Partie 1: Prüfverfahren für Mauersteine - Teil 1: Bestimmung der
Détermination de la résistance à la compression Druckfestigkeit
This European Standard was approved by CEN on 25 December 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 772-1:2011: E
worldwide for CEN national Members.
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Principle .4
4 Symbols .4
5 Materials .5
6 Apparatus .5
7 Preparation of specimens .5
8 Procedure .9
9 Calculation and expression of results . 10
10 Evaluation of results . 10
11 Test report . 10
Annex A (informative) Conversion of the compressive strength of masonry units to the
normalised compressive strength . 12
Annex B (normative) Surface preparation and conditioning of units . 13
Foreword
This document (EN 772-1:2011) 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 November 2011, and conflicting national standards shall be withdrawn
at the latest by November 2011.
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 772-1:2000.
There have been no technical changes compared to EN 772-1:2000. The opportunity has been taken to
introduce a normative Annex B which includes the methods of surface preparation and conditioning for each
unit type. This information was previously available in the product specifications only, consequently EN 771-1
now becomes a stand-alone document.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies a method for determining the compressive strength of masonry units.
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 771-1, Specification for masonry units — Part 1: Clay masonry units
EN 771-2, Specification for masonry units — Part 2: Calcium silicate masonry units
EN 771-3, Specification for masonry units — Part 3: Aggregate concrete masonry units (dense and light-
weight aggregates)
EN 771-4, Specification for masonry units — Part 4: Autoclaved aerated concrete masonry units
EN 771-5, Specification for masonry units — Part 5: Manufactured stone masonry units
EN 771-6, Specification for masonry units — Part 6: Natural stone masonry units
EN 772-2, Methods of test for masonry units — Part 2: Determination of percentage area of voids in
aggregate concrete masonry units (by paper indentation)
EN 772-10, Methods of test for masonry units — Part 10: Determination of moisture content of calcium silicate
and autoclaved aerated concrete units
EN 772-13, 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 1015-11, Methods of test for mortar for masonry — Part 11: Determination of flexural and compressive
strength of hardened mortar
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1:2005)
3 Principle
The specimens, after preparation, when needed, are laid and centred on the platen of a compression testing
machine. A uniformly distributed load is applied and increased continuously up to failure.
4 Symbols
f normalised compressive strength of masonry unit (N/mm );
b
d shape factor multiplier used to convert the air-dry compressive strength of the masonry specimens to the
normalised compressive strength.
5 Materials
Sand with a maximum grain size of 1 mm.
Cement
6 Apparatus
6.1 Testing machine that conforms to the requirements of Table 1.
Table 1 — Requirements for testing machines
Maximum permissible Maximum permissible mean Maximum permissible error
repeatability of forces as error of forces as percentage of zero force as percentage of
percentage of indicated force of indicated force maximum force of range
% % %
2,0 ± 2,0 ± 0,4
The testing machine shall have adequate capacity to crush all the test specimens, but the scale used shall be
such that the failure load on the specimen exceeds one-fifth of the full scale reading. The machine shall be
provided with a load-pacer or equivalent means to enable the load to be applied at the rate given in 8.2. The
testing machine shall be equipped with two steel-bearing platens. The stiffness of the platens and the manner
of load transfer shall be such that the deflection of the platen surfaces at failure load shall be less than 0,1 mm
measured over 250 mm. The platens shall either be through hardened or the faces case hardened. The
testing faces shall have a Vickers hardness of at least 600 HV when tested in accordance with EN ISO 6507-1.
One platen of the machine shall be able to align freely with the specimens as contact is made, but shall be
restrained by friction or other means from tilting during loading. The other platen shall be a plane non-tilting
block. The bearing faces of both platens shall be larger than the size of the largest specimen to be tested.
Where auxiliary platens are used, they shall be properly located and of the same hardness, stiffness and
planeness as the main platens. The bearing surfaces of the platens shall not depart from a plane by more
than 0,05 mm.
6.2 Weighing instrument capable of weighing specimens to an accuracy of 0,1 % of their mass.
6.3 Sufficient stiff steel strips for use on shell bedded or strip bedded ground units (See 8.1).
7 Preparation of specimens
7.1 Sampling
The method of sampling shall be in accordance with the relevant part of EN 771. The minimum number of
specimens shall be six, but a larger minimum number may be specified in the product specification, in which
case that larger number shall be used. In the case of large masonry units representative portions, e.g. cubes,
may be cut from the masonry unit in different positions as stated in the relevant part of EN 771 (see also Note
to 7.2.4).
7.2 Surface preparation
7.2.1 General
Specimens shall be tested in the orientation specified, and this shall be stated in the test report. For certain
forms of construction, it will be necessary to test the masonry units in more than one orientation. Where
grinding in accordance with 7.2.4 significantly alters the contact surface or reduces the height significantly
alternative approaches are required, see 7.2.4. Where it is not practicable to prepare clay HD units by grinding
e.g. high strength units, the surface preparation may be carried out by capping in accordance with 7.2.5
After the removal of any superfluous material, e.g. flashing from the production process, the faces of the
specimen, whether a whole masonry unit or a piece cut from a larger unit (see 7.1), through which the load is
to be applied, shall be plane to a tolerance of 0,1 mm in any 100 mm and such that the top surface lies
between two parallel planes which are parallel to the bottom surface, and not greater than 1 mm apart for
every 100 mm. If the test faces of the masonry unit as manufactured, or the piece cut from a larger unit, fail to
achieve this specification, then prepare the surfaces either by grinding (see 7.2.4) or by capping (see 7.2.5).
Masonry units containing frogs, and not required to be capped, shall additionally be treated as given in 7.2.3.
If the specimens contain grooves or tongues first prepare them as given in 7.2.2. Test specimens shall be
prepared in accordance with Annex B.
State the method of surface preparation in the test report.
7.2.2 Removal of tongues and grooves
Remove any tongues and/or grooves on the test faces of units prior to testing. If pieces are to be cut from
larger units, arrange the cutting so that any tongues and/or grooves are eliminated.
7.2.3 Preparation of masonry units containing frogs and which are not to be capped
For masonry units with frogs that are assessed to have a net loaded area of more than 35 % of the bed face,
test them without removing or filling the frogs. Where the net loaded area of masonry units with frogs is less
than or equal to 35 % of the gross area then the frogs shall be filled with mortar of the same kind as used for
capping (see 7.2.5) and the curing shall be carried out in accordance with the requirements of 7.2.5.4.
7.2.4 Grinding
Grind the surfaces of the specimen until the requirement for planeness and parallelism given in 7.2.1 is
achieved. However, if the masonry units have frogs, indented lettering, cavities, perforations, internal or
external holes, leave these in place. If the grinding process would significantly alter the contact area of the
tested faces then the capping procedure of 7.2.5 shall be followed. If the remaining height of the specimens
after they are ground is less than 40 mm or the height/width ratio less than 0,4, then make up a composite
specimen by placing one upon the other without using any mortar or binding material or separating layer(s)
between them.
NOTE Where a composite specimen is made up from more than one ground unit, this should be considered as a
single specimen providing a single test result. Accordingly, a greater number of masonry units than that specifically stated
in EN 771 will be necessary in order to provide the required number of test results.
7.2.5 Capping
7.2.5.1 Capping of masonry units without voids or with voids unfilled
Use a cement/sand capping mortar expected to attain a minimum compressive strength,
...
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