SIST EN 1052-5:2005

SLOVENSKI STANDARD
SIST EN 1052-5:2005
01-junij-2005
Metode preskušanja za zidovje – 5. del. Ugotavljanje sprijemne trdnosti z metodo
„bond wrench“
Methods of test for masonry - Part 5: Determination of bond strength by the bond wrench
method
Prüfverfahren für Mauerwerk - Teil 5: Bestimmung der Biegehaftzugfestigkeit
Méthodes d'essai de la maçonnerie - Partie 5 : Détermination de la résistance a la
rupture d'un joint de muret selon la méthode du moment de flexion en tete de muret
Ta slovenski standard je istoveten z: EN 1052-5:2005
ICS:
91.080.30 Zidane konstrukcije Masonry
SIST EN 1052-5:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 1052-5:2005

---------------------- Page: 2 ----------------------

SIST EN 1052-5:2005
EUROPEAN STANDARD
EN 1052-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2005
ICS 91.080.30
English version
Methods of test for masonry - Part 5: Determination of bond
strength by the bond wrench method
Méthodes d'essai de la maçonnerie - Partie 5: Prüfverfahren für Mauerwerk - Teil 5: Bestimmung der
Détermination de la résistance à la rupture d'un joint de Biegehaftzugfestigkeit
muret selon la méthode du moment de flexion en tête de
muret
This European Standard was approved by CEN on 14 February 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, 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
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1052-5:2005: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN 1052-5:2005
EN 1052-5:2005 (E)
Contents Page
Foreword. 3
1 Scope. 4
2 Normative references . 4
3 Principle . 4
4 Terms, definitions and symbols . 4
5 Materials. 6
6 Apparatus . 6
7 Preparation and curing of specimens. 8
8 Procedure . 9
9 Measurements and observations. 10
10 Replications. 10
11 Calculations. 10
12 Evaluation of results. 11
13 Test report . 12
Annex A (normative) Failure modes which provide a valid bond strength result. 13
Bibliography . 15

2

---------------------- Page: 4 ----------------------

SIST EN 1052-5:2005
EN 1052-5:2005 (E)
Foreword
This document (EN 1052-5:2005) 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 2005, and conflicting national standards
shall be withdrawn at the latest by October 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia,
Spain, Sweden, Switzerland and United Kingdom.


3

---------------------- Page: 5 ----------------------

SIST EN 1052-5:2005
EN 1052-5:2005 (E)
1 Scope
This document specifies a method for determining the bond strength of horizontal bed joints in
masonry using a bond wrench.
Guidance is given on the preparation of the specimens, the conditioning required before testing, the
testing equipment, machine, the method of test, the method of calculation and the contents of the test
report.
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 772-1, 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 998-2, Specification for mortar for masonry — Part 2: Masonry mortar
EN 1015-3, Methods of test for mortar for masonry — Part 3: Determination of consistence of fresh
mortar (by flow table)
EN 1015-7, Methods of test for mortar for masonry — Part 7: Determination of air content of fresh
mortar
EN 1015-11, Methods of test for mortar for masonry — Part 11: Determination of flexural and
compressive strength of hardened mortar
3 Principle
The bond strength of masonry by the bond wrench method is derived from the strength of small
masonry specimens tested to destruction. The specimen is rigidly held and a clamp is applied to the
top unit. A bending moment is applied to the clamp by a lever until the top unit is pulled from the
remainder. The characteristic value, calculated from the maximum stresses achieved by the samples
is considered to be the bond strength of the masonry.
4 Terms, definitions and symbols
For the purposes of this document, the following terms and definitions apply.
4.1
masonry
assemblage of masonry units laid in a specified pattern and jointed together with mortar
4.2
bond strength
strength of a masonry specimen when subjected to a locally applied normal force and bending
moment so as to remove a single unit from the specimen
4

---------------------- Page: 6 ----------------------

SIST EN 1052-5:2005
EN 1052-5:2005 (E)
4.3
hydraulic cement mortar
mortar with cement or cement and air-lime as the binder where the mass of air lime does not exceed
50 % of the total binder mass
4.4
lime based mortar
mortar with cement and air-lime as the binder where the mass of cement does not exceed 50 % of the
total binder mass
4.5
air-lime
limes mainly consisting of calcium oxcide or hydroxide which slowly harden in air by reacting with
atmospheric carbon dioxide. Generally they do not harden under water as they have no hydraulic
properties
4.6 Symbols
e distance from the applied load to the tension face of the specimen in mm
1
e
distance from the centre of gravity of the lever and upper clamp from the tension face
2
of the specimen in mm
W weight of masonry unit pulled of the specimen and any adherent mortar in N
F applied load in N
1
F
weight of the bond wrench in N
2
2
f individual bond strength in N/mm
wi
2
f
mean bond strength in N/mm
w
2
f characteristic bond strength in N/mm
wk
d
mean depth of the specimen in mm
b mean width of the bed joint tested in mm
Y logarithm of the individual bond strength (f )
i wi
3
Z section modulus of the projected plan area of the failure surface in mm
n
number of individual values
s standard deviation of the logarithmic values
k numerical factor
5

---------------------- Page: 7 ----------------------

SIST EN 1052-5:2005
EN 1052-5:2005 (E)
5 Materials
5.1 Masonry units
5.1.1 Conditioning of the units
Record the method of conditioning the masonry units prior to laying. Measure the moisture content by
mass of autoclaved aerated concrete and calcium silicate units in accordance with EN 772-10. For
other types of masonry unit, record the method of conditioning the units prior to laying. Record the
age of non-autoclaved concrete units at the time of testing the masonry specimens.
5.1.2 Testing
Determine the compressive strength of a sample of masonry units, using the test method given in
EN 772-1. For non-autoclaved concrete units determine the compressive strength at the time of
testing the masonry specimens.
5.2 Mortar
The mortar, its mixing procedure and its flow value shall conform to the requirements of EN 998-2,
unless otherwise specified, and these shall be reported in the test report.
Take representative samples of fresh mortar from the mason’s board to make mortar prism
specimens, to determine the flow value in accordance with EN 1015-3 and to determine the air
content in accordance with EN 1015-7. Determine the mean compressive strength at the time of
testing the masonry specimens in accordance with EN 1015-11.
6 Apparatus
A support frame and clamp which holds in place the unit beneath the top bed joint of the stack bonded
specimen without applying any significant bending moment to any lower units.
A lever which has a clamp at one end which can be applied to the top unit of the stack bonded
specimen. The lever arm should be at least 1 m in length. The tensile stress applied to a specimen
2
due to the weight of the lever and clamp should
...