EN 1766:2017

SLOVENSKI STANDARD
01-april-2017
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Products and systems for the protection and repair of concrete structures - Test methods
- Reference concretes for testing
Produkte und Systeme für den Schutz und die Instandsetzung von Betontragwerken -
Prüfverfahren - Referenzbetone für Prüfungen
Produits et systèmes pour la protection et la réparation des structures en béton -
Méthodes d'essais - Bétons de référence pour essais
Ta slovenski standard je istoveten z: EN 1766:2017
ICS:
91.080.40 Betonske konstrukcije Concrete structures
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.

EN 1766
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 91.080.40 Supersedes EN 1766:2000
English Version
Products and systems for the protection and repair of
concrete structures - Test methods - Reference concretes
for testing
Produits et systèmes pour la protection et la réparation Produkte und Systeme für den Schutz und die
des structures en béton - Méthodes d'essais - Bétons de Instandsetzung von Betontragwerken - Prüfverfahren -
référence pour essais Referenzbetone für Prüfungen
This European Standard was approved by CEN on 4 December 2016.

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, Serbia, 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
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1766:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Principle . 4
4 Equipment . 4
4.1 Concrete mixer (forced action pan mixer) . 4
4.2 Moulds . 4
4.3 High frequency vibrating table . 4
4.4 Grit blasting equipment . 5
4.5 Surface roughness measuring equipment . 5
5 Materials . 5
5.1 Aggregates . 5
5.2 Mixing water . 6
5.3 Cement . 6
5.4 Admixtures . 6
5.5 Grit for surface preparation by blasting . 6
5.6 Silica sand for measuring roughness . 6
6 Reference concrete mixes . 6
6.1 General . 6
6.2 Reference concrete with 16 mm or 20 mm aggregate . 6
6.2.1 Compositions and properties (see Table 1) . 6
6.3 Reference concrete with 8 mm or 10 mm aggregate . 7
6.3.1 Compositions and properties (see Table 1) . 7
6.4 Specimen preparation . 10
6.5 Concrete curing and storage . 10
7 Surface preparation and roughness index determination . 10
7.1 Surface preparation . 10
7.2 Measurement of the Roughness index . 10
8 Report . 12
Annex A (informative) Grading curves . 13

European foreword
This document (EN 1766:2017) has been prepared by Technical Committee CEN/TC 104 “Concrete and
related products”, the secretariat of which is held by DIN.
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 August 2017, and conflicting national standards shall
be withdrawn at the latest by November 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1766:2000.
The main technical changes that have been made in this new edition are as follows:
a) Definition of 3 new reference MC concretes;
b) Definition of thresholds for the tensile bond strength for reference concretes C(0,40); C(0,45);
C(O,70) and new MC concretes.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Serbia, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
1 Scope
This European Standard specifies the composition, characteristics and preparation procedure for
reference concrete substrates, which are to be used in the test methods to measure performances of
products and systems for the repair and protection of concrete structures.
The provisions of this Standard are applicable to concrete with a maximum aggregate size of 16 mm or
20 mm or with a maximum aggregate size of 8 mm or 10 mm.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 197-1, Cement - Part 1: Composition, specifications and conformity criteria for common cements
EN 206, Concrete — Specification, performance, production and conformity
EN 933-2, Tests for geometrical properties of aggregates - Part 2: Determination of particle size
distribution - Test sieves, nominal size of apertures
EN 934-2, Admixtures for concrete, mortar and grout — Part 2: Concrete admixtures — Definitions,
requirements, conformity, marking and labelling
EN 1008, Mixing water for concrete - Specification for sampling, testing and assessing the suitability of
water, including water recovered from processes in the concrete industry, as mixing water for concrete
EN 1542, Products and systems for the protection and repair of concrete structures - Test methods -
Measurement of bond strength by pull-off
EN 12390-3, Testing hardened concrete - Part 3: Compressive strength of test specimens
EN 12620, Aggregates for concrete
3 Principle
Reference concrete test specimens with reproducible surface texture and appropriate strength are cast
to enable the resistance against physical or chemical exposure of repair materials to be evaluated.
The required surface roughness is obtained by grit blasting the surface of the hardened concrete.
4 Equipment
4.1 Concrete mixer (forced action pan mixer)
4.2 Moulds
Moulds for producing concrete specimens, of non-absorbent, rigid material, not attacked by cement
paste, of a size 300 mm × 300 mm × 100 mm or other sizes specified in individual test method
standards, corresponding to the property to be tested, shall be used.
4.3 High frequency vibrating table
Or vibration rod suitable for compaction of the concrete in the moulds.
4.4 Grit blasting equipment
It shall comply with the following:
a) air pressure approximately 0,5 MPa;
b) nozzle diameter 8 mm to 12 mm;
c) the spread angle of the nozzle shall be sufficient to prevent the jet from cutting deeply into the
concrete surface. This shall be demonstrated by preliminary test.
NOTE As alternative, high pressure water-blasting equipment, capable of operating with or without the
addition of grit, can be used subject to preliminary tests to confirm that the required surface texture can be
achieved.
4.5 Surface roughness measuring equipment
a) Measuring cylinder, of (25 ± 1) ml total capacity and 20 mm maximum internal diameter;
b) disc, comprising a flat wooden disc (65 ± 5) mm in diameter with a hard rubber disc of the same
diameter (1,5 ± 0,5) mm thick stuck to one face, the reverse face being provided with a handle (see
Figure 1).
Dimensions in millimetre
Key
1 wooden disk
2 handle
3 rubber disk
Figure 1 — Disk for surface roughness measurement
5 Materials
5.1 Aggregates
Aggregates according to EN 12620 shall be natural and silica-based with low water absorption (less
than 2 % by mass). The aggregate grading, measured according to EN 933-2, shall conform to the
maximum sizes listed in clause 6.2 and 6.3 and have an appropriate size distribution in order to obtain
the mechanical properties specified for each type, i.e. tensile strength, tensile bond strength and
compressive strength. Typical aggregate gradings for this purpose are exemplary, given in Annex A.
5.2 Mixing water
Water according to EN 1008 shall be used.
5.3 Cement
Portland type CEM I 42,5 R according to EN 197-1 shall be used.
5.4 Admixtures
Admixtures according to EN 934-2 shall be used.
5.5 Grit for surface preparation by blasting
Commercial grit for grit-blasting of concrete shall be used, with grain size within the range of 0,25 mm
to 1,0 mm. The grit shall not contain ferrous components such as chilled cast iron slag, which are prone
to rusting.
5.6 Silica sand for measuring roughness
Silica sand with a grain size of 0,05 mm to 0,1 mm, dried to a constant weight, shall be used.
6 Reference concrete mixes
6.1 General
This standard specifies eight types of reference concrete, defined by the maximum size of the aggregate
and mix proportions. The reference concrete is chosen according to the type of product or system for
the protection and repair of concrete structures and to the related test methods standards.
NOTE 1 The water taken into account hereafter in the water/cement ratio is the added water plus the water
already contained in the admixtures and the additions.
Workability should be appropriate to achieve adequate placing of concrete with freedom from bleeding
or segregation. Any speci
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