EN 12390-4:2019
(Main)Testing hardened concrete - Part 4: Compressive strength - Specification for testing machines
Testing hardened concrete - Part 4: Compressive strength - Specification for testing machines
This document specifies the requirements for the performance of compression testing machines for the measurement of the compressive strength of concrete.
Prüfung von Festbeton - Teil 4: Bestimmung der Druckfestigkeit - Anforderungen an Prüfmaschinen
Dieses Dokument legt die Anforderungen an die Leistung von Druckprüfmaschinen zur Prüfung der Druckfestigkeit von Beton fest.
Essais pour béton durci - Partie 4 : Résistance à la compression - Caractéristiques des machines d’essai
Le présent document spécifie les exigences relatives aux performances des machines d’essai pour la mesure de la résistance du béton à la compression.
Preskušanje strjenega betona - 4. del: Tlačna trdnost - Specifikacija za stiskalnice
Ta dokument določa zahteve za zmogljivost tlačnih stiskalnic za merjenje tlačne trdnosti betona.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2019
Nadomešča:
SIST EN 12390-4:2001
Preskušanje strjenega betona - 4. del: Tlačna trdnost - Specifikacija za stiskalnice
Testing hardened concrete - Part 4: Compressive strength - Specification for testing
machines
Prüfung von Festbeton - Teil 4: Bestimmung der Druckfestigkeit - Anforderungen an
Prüfmaschinen
Essais pour béton durci - Partie 4 : Résistance à la compression - Caractéristiques des
machines d'essai
Ta slovenski standard je istoveten z: EN 12390-4:2019
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.
EN 12390-4
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 91.100.30 Supersedes EN 12390-4:2000
English Version
Testing hardened concrete - Part 4: Compressive strength -
Specification for testing machines
Essais pour béton durci - Partie 4 : Résistance à la Prüfung von Festbeton - Teil 4: Bestimmung der
compression - Caractéristiques des machines d'essai Druckfestigkeit - Anforderungen an Prüfmaschinen
This European Standard was approved by CEN on 19 August 2019.
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, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12390-4:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Construction of machines . 7
5 Details to be provided by the supplier/manufacturer . 10
Annex A (normative) Strain gauged column and proving procedure for compression testing
machines . 12
Bibliography . 16
European foreword
This document (EN 12390-4:2019) has been prepared by Technical Committee CEN/TC 104 “Concrete
and related products”, the secretariat of which is held by SN.
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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
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 12390-4:2000.
This standard is one of a series on testing concrete.
EN 12390, Testing hardened concrete, consists of the following parts:
— Part 1: Shape, dimensions and other requirements for specimens and moulds;
— Part 2: Making and curing specimens for strength tests;
— Part 3: Compressive strength of test specimens;
— Part 4: Compressive strength – Specification for testing machines;
— Part 5: Flexural strength of test specimens;
— Part 6: Tensile splitting strength of test specimens;
— Part 7: Density of hardened concrete;
— Part 8: Depth of penetration of water under pressure;
— Part 10: Determination of the carbonation resistance of concrete at atmospheric levels of carbon
dioxide;
— Part 11: Determination of the chloride resistance of concrete, unidirectional diffusion;
— Part 12: Determination of the potential carbonation resistance of concrete: Accelerated carbonation
method (in preparation);
— Part 13: Determination of secant modulus of elasticity in compression;
— Part 14: Semi-adiabatic method for the determination of heat released by concrete during its
hardening process;
— Part 15: Adiabatic method for the determination of heat released by concrete during its hardening
process;
— Part 16: Determination of the shrinkage of concrete;
— Part 17: Determination of creep of concrete in compression.
— the text is aligned with EN ISO 7500-1 to avoid duplication;
— machines to be Class 1 except those manufactured before 2000 where Class 2 is acceptable;
— increase in verification points and new limits of acceptance over working range;
— description of verification procedure for strain gauge column;
— deletion of Annex B.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Introduction
The requirements for testing machines set out in this document have been formulated to satisfy the
needs of those compressive tests on concrete specimens which are specified in EN 206:2013+A1:2016.
Machines conforming to this standard can be suitable for other uses, but this needs to be carefully
considered on an individual test basis. Particular care needs to be taken before using machines
conforming to this document for compressive tests on small specimens, e.g. those with lateral
dimensions significantly less than 100 mm. The main concern is that the ball-seating fitted to the upper
platen can be too large to align satisfactorily on the top of such small specimens and special adaptations
can be required. Another concern is the ability to accurately determine the failure load of small or low
strength specimens.
1 Scope
This document specifies the requirements for the performance of compression testing machines for the
measurement of the compressive strength of concrete.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 ISO 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1)
EN ISO 7500-1:2018, Metallic materials - Calibration and verification of static uniaxial testing machines -
Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system
(ISO 7500-1:2018)
EN ISO 4287, Geometrical product specifications (GPS) - Surface texture: Profile method - Terms,
definitions and surface texture parameters (ISO 4287)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
auxiliary platen
separate platen usually of a size equal to the designated size of the specimen being tested
3.2
contact area
part of the platen that comes into contact with the specimen
3.3
indicated force
force indicated on the machine scale(s) or display
3.4
indication range
total force range, from zero to maximum, displayed on the machine
3.5
machine platens
lower platen and upper platen both centred on the central vertical axis of the machine and where the
upper platen is spherically seated
3.6
measuring range
part of an indication range over which the machine conforms with the accuracy values specified in
EN ISO 7500-1
3.7
spacing block
metal block to adjust the space available to test specimens
3.8
true force
force indicated on a calibrated force proving device
4 Construction of machines
4.1 Machine platens, auxiliary platens and spacing blocks
NOTE The use of auxiliary platens is optional.
4.1.1 Machine and auxiliary platens shall be made of a material which shall not deform irreversibly
when the machine is used.
4.1.2 Machine and auxiliary platens shall have a hardness value of at least 570HV30 (or 53HRC) when
tested in accordance with EN ISO 6507-1.
4.1.3 The flatness tolerance for machine platens and auxiliary platens shall be 0,03 mm for the area in
contact with the specimen.
NOTE For the purpose of this document, flatness can be assessed by the measurement of straightness in four
positions (see EN 12390-1:2012, Annex B).
4.1.4 The roughness value (R ) for the surface texture of machine and auxiliary platens shall be in the
a
range 0,4 μm to 3,2 μm, when assessed in accordance with EN ISO 4287 for the area in contact with the
specimens.
4.1.5 The area of machine platens (including auxiliary platens) in contact with the specimen shall be
at least as great as the area of the specimen being tested. The distance between opposite edges of a
square platen, or the diameter of a circular platen, shall not be less than the designated size of the
specimen.
4.1.6 The two contact faces of an auxiliary platen shall be parallel to a tolerance of 0,05 mm.
4.1.7 Auxiliary platens shall be at least 23 mm thick.
4.1.8 Spacing blocks may be used if there is a requirement to reduce the distance between the
machine platens.
For stability reasons, the total number of spacing blocks shall not exceed four. Spacing blocks shall be
precisely centred along the machine axis.
4.1.9 A spacing block may be either circular or square in section and shall be rigidly supported from
below.
A minimum diameter or length of side of 200 mm is recommended for spacing blocks.
4.1.10 Spacing blocks shall comply with the flatness and parallelism tolerances required for auxiliary
platens (see 4.1.3 and 4.1.6).
4.1.11 Spacing blocks shall be positioned below the lower machine platen and not in contact with the
specimen.
4.1.12 Spacing blocks shall be precisely positioned centrally on the vertical machine axis.
4.2 Force measurement
4.2.1 Force indicator
The machine shall be provided with:
— dials or digital displays which allow the force to be read to the accuracy specified in 4.2.2;
— a system which allows the maximum force sustained to be read after completion of the test, until
reset;
— displays readable from the operating position.
The machine force indication system shall not be affected by explosive failure of the specimen.
The lowest verifiable value of each measuring range shall be less than or equal to 20 % of the maximum
value of the range. If the machine is equipped with several indication ranges, the above requirement
shall apply to each range.
4.2.2 Force indicator accuracy
For machines built after the publication of the first edition of this standard (year 2000), the required
accuracy of the force indication shall be class 1 according to EN ISO 7500-1:2018, Table 1 (maximum
relative error of indication = ± 1 %).
Machines built before the publication of the first edition of this standard (year 2000) shall conform to
the requirements of Table 1 in EN ISO 7500-1:2018, Class 2 (maximum relative error of
indication = ± 2 %) unless national provisions specify differently.
The accuracy of force indication shall be maintained under any or all of the following circumstances:
— mains voltage fluctuations of –14 % to +10 %;
— at a temperature of 10 °C to 35 °C;
— at a relative humidity of up to 80 %.
NOTE Where electrical or other interference exists, this can affect the accuracy of force indication and special
provisions to overcome this interference can be necessary.
4.3 Force control
4.3.1 The compression testing machine shall be provided with a control system. The control system
shall enable the machine to be verified
...
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