EN 12371:2001

SLOVENSKI STANDARD
SIST EN 12371:2002
01-maj-2002
Preskušanje naravnega kamna – Ugotavljanje odpornosti proti zmrzovanju
Natural stone test methods - Determination of frost resistance
Prüfverfahren für Naturstein - Bestimmung des Frostwiderstandes
Méthodes d'essai pour pierres naturelles - Détermination de la résistance au gel
Ta slovenski standard je istoveten z: EN 12371:2001
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
SIST EN 12371:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 12371:2002

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SIST EN 12371:2002
EUROPEAN STANDARD
EN 12371
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 73.020; 91.100.15
English version
Natural stone test methods - Determination of frost resistance
Méthodes d'essai pour pierres naturelles - Détermination Prüfverfahren für Naturstein - Bestimmung des
de la résistance au gel Frostwiderstandes
This European Standard was approved by CEN on 17 August 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12371:2001 E
worldwide for CEN national Members.

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SIST EN 12371:2002
EN 12371:2001 (E)
Contents page
Foreword .3
1 Scope .4
2 Normative references.4
3 Principle.4
4 Symbols.4
5 Apparatus .5
6 Preparation of the specimens.5
7 Test procedure .7
8 Expression of the results .10
9 Test report .10
Annex A (informative).12
2

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SIST EN 12371:2002
EN 12371:2001 (E)
Foreword
This European Standard has been prepared by Technical Committee TC 246 "Natural Stone", 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 April 2002, and conflicting national standards shall be
withdrawn at the latest by December 2002.
This standard is one of the series of draft standards for tests on natural stone.
Test methods for natural stone consist of the following parts:
EN 1925 Natural stone test methods – Determination of water absorption coefficient
by capillarity
EN 1926 Natural stone test methods – Determination of compressive strength
EN 1936 Natural stone test methods – Determination of real density and apparent
density and of total porosity and open porosity.
EN 12370 Natural stone test methods – Determination of resistance to salt
crystallisation
EN 12372 Natural stone test methods – Determination of flexural strength under
concentrated load
EN 12407 Natural stone test methods – Petrographic examination
prEN 13161 Natural stone test methods – Determination of flexural resistance (under
constant moment).
prEN 13364 Natural stone test methods – Determination of the breaking load at dowel
hole
prEN 13373 Natural stone test methods – Determination of geometric characteristics on units
prEN 13755 Natural stone test methods – Determination of water absorption at atmospheric
pressure
prEN 13919 Natural stone test methods – Determination of resistance to ageing by SO
2
action in the presence of humidity
prEN 14066 Natural stone test methods – Determination of resistance to ageing by
thermal shock
prEN 14146 Natural stone test methods - Determination of the dynamic modulus of
elasticity (by measuring the fundamental resonance frequency)
prEN 14147 Natural stone test methods – Determination of resistance to ageing by salt
mist
prEN 14157 Natural stone test methods – Determination of abrasion resistance
prEN 14158 Natural stone test methods – Determination of rupture energy
prEN 14205 Natural stone test methods – Determination of Knoop hardness
prEN …(WI 00246011) Natural stone test methods – Determination of thermal dilatation coefficient
prEN …(WI 00246012) Natural stone test methods – Determination of sound – speed propagation
prEN …(WI 00246017) Natural stone test methods – Determination of slip coefficient
prEN …(WI 00246018) Natural stone test methods – Determination of static elastic modulus
It is intended that other ENs should call up this European Standard as the basis of evaluation of
conformity. (Nevertheless it is not intended that all natural stones products should be subjected
regularly to all the listed tests. Specifications in other standards should call up only relevant test
methods).
This European Standard contains Annex A (informative).
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and the United Kingdom.
3

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SIST EN 12371:2002
EN 12371:2001 (E)
1 Scope
This European Standard specifies a method to assess the effect of freeze/thaw cycles on natural
stones – refer to prEN 12670 for terminology, and EN 12440 for denomination -. The standard
contains provision for both a shorter technological test (Test A) to assess the effect of freeze/thaw
cycles on the relevant performance characteristics and an identification test (Test B).
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references, the last edition of the publication referred to applies (including
amendments).
EN 1926 Natural stone test methods – Determination of compressive strength.
EN 12372 Natural stone test methods. Determination of flexural strength under
concentrated load.
EN 12440 Natural stone - Denomination criteria.
prEN 12670 Terminology of natural stone.
prEN 13161 Natural stone test methods - Determination of flexural resistance (under
constant moment).
prEN 13364 Natural stone test methods - Determination of the breaking load at dowel hole.
prEN 14066 Natural stone test methods - Determination of resistance to ageing by thermal
shock.
prEN 14146 Natural stone test methods - Determination of the dynamic modulus of
elasticity (by measuring the fundamental resonance frequency).
3 Principle
The frost resistance of natural stone units is determined by a test comprising cycles of freezing in air
and thawing in water.
4 Symbols
M mass of the dry specimen before immersion in water and before freezing, in grams
d0
M mass of the saturated specimen after immersion in water and before freezing, in
s0
grams
M apparent mass of the specimen in water before freezing, in grams
h0
M mass of the dry specimen at n cycles, in grams
dn
M mass of the saturated specimen at n cycles, in grams
sn
M apparent mass of the specimen in water at n cycles, in grams
hn
V apparent volume of the specimen before freezing, in millilitres
b0
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SIST EN 12371:2002
EN 12371:2001 (E)
V apparent volume of the specimen at n cycles, in millilitres
bn

V change in apparent volume of the specimen, as a percentage
b
E dynamic elastic modulus of the dry specimen before freezing, in Megapascals
0
E dynamic elastic modulus of the dry specimen at n cycles, in Megapascals
n

E change in dynamic elastic modulus, as a percentage
5 Apparatus
5.1 A freezing tank of sufficient capacity to hold the required number of specimens, possibly with an
automatic control system to programme the freezing and thawing cycles within the chamber with a
precision of + 1,0
C.
NOTE The tests can be executed manually if no suitable automated system is available.
5.2 A temperature recording system capable of measuring temperature to + 0,1
C.
5.3 A device for measuring dynamic elastic modulus in accordance with prEN 14146.
5.4 A weighing instrument with an accuracy of at least 0,01% of the mass to be weighed.
5.5 A ventilated oven capable of maintaining a temperature of (70  5)
C.
6 Preparation of the specimens
6.1 Sampling
The sampling is not the responsibility of the test laboratory except where specially requested.
For an identification test, at least seven specimens, which are considered representative of the body of
stone being tested, shall be selected. Use one specimen to monitor the core temperature.
For technological tests the number of specimens shall be in accordance with the appropriate standard
(see also Table 1). Two sets of specimens are required, one to be tested after being subjected to the
freeze/thaw cycles, the other to be tested without freeze/thaw cycling. Each set shall be randomly
selected from the body of stone to be tested. In addition, one extra specimen is used to monitor the
temperature of the specimens.
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SIST EN 12371:2002
EN 12371:2001 (E)
Table 1 - Summary of the application of the freeze/thaw test
Technological test (Test A) Identification
test
Flexural Load at a Thermal shock Compressive (Test B)
strength dowel hole strength
200 x 200 x t
1
Specimen
(see Note
or
size 200 x 200 x 20 (see Note 4) 50 x 50 x 300
1) 300 x 300 x t
2
in mm
(see Note 2)
Minimum 5 or 7
number of 21 (see Note 3) 15 13 13
specimens
NOTE 1 Specimen size according to EN 12372 or prEN 13161.
NOTE 2 30 mm t  65 mm; 65 mm< t  80 mm.
1 2
NOTE 3 The number of specimens depends on the presence of any anisotropic features.
NOTE 4 Specimen size according to EN 1926.
6.2 Size of specimens
6.2.1 Technological test (Test A)
Where the test is carried out to determine the effect of freeze/thaw cycles on performance
characteristics (for example EN 12372 or prEN 13161 - flexural strength, prEN 13364 - breaking load
at a dowel hole, prEN 14066 - resistance to thermal shock, and EN 1926 - compressive strength) the
specimens shall be in accordance with the appropriate standard.
6.2.2 Identification test (Test B)
The specimens are in the form of rectangular prisms with dimensions of 50 mm x 50 mm x 300 mm.
The long axis shall be parallel to the anisotropy planes.
6.2.3 Putting reference marks on the specimens
To ensure that the various dynamic elastic modu
...