EN 1926:2006

SLOVENSKI STANDARD
01-marec-2007
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SIST EN 1926:2000
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Natural stone test methods - Determination of uniaxial compressive strength
Prüfverfahren für Naturstein - Bestimmung der einachsigen Druckfestigkeit
Méthodes d'essai des pierres naturelles - Détermination de la résistance en compression
uniaxiale
Ta slovenski standard je istoveten z: EN 1926:2006
ICS:
73.020 Rudarstvo in kamnolomsko Mining and quarrying
izkopavanje
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 1926
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 73.020; 91.100.15 Supersedes EN 1926:1999
English Version
Natural stone test methods - Determination of uniaxial
compressive strength
Méthodes d'essai des pierres naturelles - Détermination de Prüfverfahren für Naturstein - Bestimmung der einachsigen
la résistance à la compression uniaxiale Druckfestigkeit
This European Standard was approved by CEN on 9 November 2006.
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, Romania,
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
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1926:2006: E
worldwide for CEN national Members.

Contents          page
Foreword.3
1 Scope .4
2 Normative references .4
3 Principle.4
4 Terms and Definitions .4
5 Symbols .4
6 Apparatus .5
7 Preparation of specimens.5
7.1 Sampling.5
7.2 Test specimens.5
7.3 Surface preparation.5
7.3.1 General.5
7.3.2 Capping with mortar.6
7.4 Conditioning of specimen before testing.6
8 Procedure .6
8.1 Measuring the specimen.6
8.2 Placing the specimen in the testing machine.6
8.3 Loading .6
9 Expression of results .6
10 Test report .7
Annex A (normative) Determination of the compressive strength of armourstone .9
A.1 Scope .9
A.2 Normative references .9
A.3 Principle.9
A.4 Definitions and symbols .9
A.5 Apparatus .9
A.6 Preparation of specimens.9
A.6.1 Sampling.9
A.6.2 Test specimens.9
A.6.3 Surface preparation.10
A.6.4 Conditioning of specimen before testing.10
A.7 Procedure .10
A.8 Expression of results .10
A.9 Test report .10
Annex B (informative) Determination of the point load strength index of natural stone.12
B.1 General.12
B.2 Background.12
B.3 Correlation data .12
Annex C (normative) Statistical evaluation of the results.13
C.1 Scope .13
C.2 Symbols and definitions .13
C.3 Statistical evaluation of test results .14
Annex D (informative) Bibliografy related to Annex B.16
Bibliography .17
Foreword
This document (EN 1926:2006) has been prepared by Technical Committee CEN/TC 246 “Natural stones”,
the secretariat of which is held by UNI.
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 June 2007, and conflicting national standards shall be withdrawn at
the latest by June 2007.
This document supersedes EN 1926:1999.
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, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
1 Scope
This European standard specifies a method for determining the uniaxial compressive strength of natural
stones.
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 197-1, Cement – Part 1: Composition, specifications and conformity criteria for common cements
EN 12390 (all parts), Testing hardened concrete
EN 12670:2001 Natural stone - Terminology
EN 13383-1:2002, Armourstone - Part 1: Specification
3 Principle
The specimens, after mechanical preparation of surfaces or, if needed, after capping, are laid and centred on
the plate of a testing machine. A uniformly distributed load is applied and increased continuously until failure
occurs.
4 Terms and Definitions
For the purposes of this document, the terms and definitions given in EN 12670:2001 apply.
5 Symbols
h height of the specimen, in millimetres;
l mean value of the lateral dimension, i.e. the distance between opposite vertical faces of the specimen (if
cubic), in millimetres;
d mean value of the diameter of the specimen (if cylindrical), in millimetres;
A cross-sectional area of the specimen before testing, in square millimetres;
F failure load, in Newtons;
R uniaxial compressive strength of the specimen, in Megapascals;
R mean value of the uniaxial compressive strength, in Megapascals;
s standard deviation;
v coefficient of variation.
6 Apparatus
6.1 A surface grinder.
6.2 A lapping machine if final preparation of the specimens is needed.
6.3 A test machine of appropriated force, in accordance with EN 12390 and calibrated according to this
standard.
6.4 A time counter accurate to 1 s.
6.5 A ventilated oven which can maintain a temperature of (70 ± 5) °C.
6.6 A weighing instrument which has an accuracy of 0,1 g.
6.7 A linear measuring device with an accuracy of 0,05 mm.
6.8 Air conditioned room with a temperature of (20 ± 10) °C.
7 Preparation of specimens
7.1 Sampling
The sampling is not the responsibility of the testing laboratory, unless specially requested.
At least 10 specimens are to be tested and the direction of any existing plane of anisotropy recorded.
7.2 Test specimens
Test specimens shall be cubes with (70 ± 5) mm or (50 ± 5) mm edges or right circular cylinders whose
diameter and height are equal to (70 ± 5) mm or (50 ± 5) mm.
The lateral dimension or the diameter of the specimen shall be related to the size of the largest grain in the
rock by the ratio of at least 10:1. If the maximum observed dimension of the grains exceeds 7 mm, it is
recommended to have a larger number of specimens in order to obtain representative results.
The axis of the specimen shall be normal to the planes of anisotropy, e.g. bedding planes, foliation, etc. (figure
1a and 2a). If a test with orientation of loading parallel to the planes of anisotropy is required, another set of
specimens with the same dimensional characteristics shall be prepared (Figure 1b and 2b).
7.3 Surface preparation
7.3.1 General
The faces to which the load is to be applied shall be flat 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
1mm apart for every 100 mm The sides of the specimen shall be smooth and free of abrupt irregularities and
straight to within 0,3 mm over the full length of the specimen.
To meet the above requirements the specimens shall be finished on either a lathe or surface grinder, with final
preparation on a lapping machine if needed.
Capping with mortar according to the procedures indicated in 7.3.2 is to be used only if the indicated
tolerances are not obtainable with the prescribed mechanical preparation. This condition shall be clearly
indicated in the test report.
7.3.2 Capping with mortar
It is possible to cap the specimen using a mortar made with cement CEM I 52,5 R according t
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