SIST EN 14157:2017

SLOVENSKI STANDARD
oSIST prEN 14157:2016
01-oktober-2016
Naravni kamen - Ugotavljanje odpornosti proti obrabi
Natural stone test methods - Determination of the abrasion resistance
Pierres naturelles - Détermination de la résistance à l'usure
Ta slovenski standard je istoveten z: prEN 14157
ICS:
73.020 Rudarstvo in kamnolomsko Mining and quarrying
izkopavanje
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
oSIST prEN 14157:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 14157:2016

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oSIST prEN 14157:2016


DRAFT
EUROPEAN STANDARD
prEN 14157
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2016
ICS Will supersede EN 14157:2004
English Version

Natural stone test methods - Determination of the
abrasion resistance

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 246.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14157:2016 E
worldwide for CEN national Members.

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prEN 14157:2016 (E)
Contents Page

European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Method A – Wide Wheel Abrasion Test . 5
3.1 Principle . 5
3.2 Abrasive material . 5
3.3 Apparatus . 5
3.3.1 The ‘wearing’ machine . 5
3.3.2 Magnifying glass . 8
3.3.3 Ruler . 8
3.3.4 Calliper . 8
3.4 Calibration . 8
3.5 Preparation of test specimens . 9
3.6 Test procedure . 9
3.6.1 Test Method . 9
3.6.2 Measuring the groove . 9
3.7 Test results . 10
4 Method B – Böhme Abrasion Test . 10
4.1 Principle . 10
4.2 Abrasive material . 11
4.3 Apparatus . 11
4.3.1 Thickness measuring device . 11
4.3.2 Disc abrader . 11
4.3.3 Test Track . 11
4.3.4 Specimen holder . 11
4.3.5 Loading device . 11
4.4 Preparation of test specimens . 12
4.5 Test Procedure . 13
4.6 Test results . 13
5 Test report . 13
Bibliography . 15

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oSIST prEN 14157:2016
prEN 14157:2016 (E)
European foreword
This document (prEN 14157:2016) has been prepared by Technical Committee CEN/TC 246 “Natural
stones”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14157:2004.
This draft document is one of the series of draft documents 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
and open porosity
EN 12370, Natural stone test methods – Determination of resistance to salt crystallization
EN 12371, Natural stone test methods – Determination of frost resistance
EN 12372, Natural stone test methods – Determination of flexural strength under concentrated load
EN 12407, Natural stone test methods – Petrographic examination
EN 13161, Natural stone test methods – Determination of flexural strength under constant moment
EN 13373, Natural stone test methods – Determination of geometric characteristics on units
EN 13755, Natural stone test methods – Determination of water absorption at atmospheric pressure
EN 13919, Natural stone test methods – Determination of resistance to ageing by SO2 action in the
presence of humidity
EN 14066, Natural stone test methods – Determination of resistance to ageing by thermal shock
EN 14147, Natural stone test methods – Determination of resistance to ageing by salt mist
EN 14231, Natural stone test methods – Determination of the slip resistance by means of the pendulum
tester
EN 14158, Natural stone test methods – Determination of rupture energy
EN 14205, Natural stone test methods – Determination of Knoop hardness
EN 14579, Natural stone test methods – Determination of sound speed propagation
EN 14580, Natural stone test methods – Determination of static elastic modulus
EN 14581, Natural stone test methods – Determination of linear thermal expansion coefficient
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It is intended that other ENs should call up this EN 14157 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 documents should call up only relevant test methods.
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1 Scope
This European Standard specifies two test methods to determine the abrasion resistance of natural
stones used for flooring in buildings.
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 10025 (all parts), Hot rolled products of structural steels - Technical delivery conditions
EN 13373, Natural stone test methods - Determination of geometric characteristics on units
EN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1)
3 Method A – Wide Wheel Abrasion Test
3.1 Principle
The test is carried out by abrading the face of a specimen which will be exposed in use with an abrasive
material under standard conditions.
3.2 Abrasive material
The abrasive required for this test is corundum (white fused alumina) with grit size of 80 in accordance
with standard FEPA 42 F 1984. It shall not be used for more than three times.
3.3 Apparatus
3.3.1 The ‘wearing’ machine
The wearing machine (see Figure 1) is essentially made of a wide abrasion wheel, a storage hopper with
one or two control valves to regulate the output of the abrasive material, a flow guidance hopper, a
clamping trolley and a counterweight.
When two valves are used, one shall be used to regulate the rate of flow and can be permanently set
while the other is used to turn the flow on and off.
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Key
1 Clamping trolley 8 Counterweight
2 Fixing screw 9 Slot
3 Specimen 10 Groove
4 Control valve 11 Abrasive material flow
5 Storage hopper 12 Abrasive collector
6 Flow guidance hopper 13 Wedge
7 Wide abrasion wheel
Figure 1 — Principle of the wearing machine
The wide abrasion wheel shall be made of steel Fe 690 according to EN 10025. The hardness of the steel
shall be between 203 HB and 245 HB. Its diameter shall be (200 ± 1) mm and its width shall be (70 ± 1)
mm. It shall be driven to rotate 75 revolutions in (60 ± 3) seconds.
A mobile clamping trolley is mounted on bearings and forced to move forwards to the wheel by a
counterweight having a mass of (14 ± 0,01) kg.
The storage hopper containing the abrasive material feeds a flow guidance hopper.
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The flow guidance hopper may have a cylindrical or rectangular cross-section and shall have a slotted
outlet. The length of the slot shall be (45 ± 1) mm and the width shall be (4 ± 1) mm. The body of the
flow guidance hopper shall be at least 10 mm bigger than the slot in all directions. In the case of a
hopper with a rectangular cross section and at least one of the sides inclined down to the length of the
slot, these dimensional limitations are not necessary (see Figure 2).
Dimensions in millimetres

Key
For key see Figure 1
1 Inclined side
2 Vertical side
a, b, c > 10
Figure 2 — Position of the slot at the base of the flow guidance hopper in case of cylindrical cross
section (left) and of rectangular cross section (right)
The distance of the fall between the slot and the axle of the wide abrasion wheel shall be (100 ± 5) mm
and the flow of abrasive shall be (1 - 5) mm behind the leading edge of the wheel (see Figure 3).
Dimensions in millimetres

Top front view Bottom plan view
Key
For key see Figure 1
A distance of the flow of abrasive from the leading edge of the wheel (from 1 to 5).
Figure 3 — Position of the slot relative to the wide abrasion wheel for a cylindrical cross section
of the flow guidance hopper (left) and for a rectangular cross section of the flow guidance
hopper (right)
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The flow of the abrasive material from the flow guidance hopper shall be at a minimum rate of 2,5 l per
minute onto the wide abrasion wheel. The flow of abrasive shall be constant and the minimum level of
the abrasive in the flow guidance hopper shall be 25 mm (see Figure 3).
3.3.2 Magnifying glass
A magnifying glass having at least 2 × magnification and preferably equipped with a light.
3.3.3 Ruler
A steel ruler.
3.3.4 Calliper
A digital calliper, having an accuracy of at least 0,05 mm.
3.4 Calibration
The apparatus shall be calibrated after grinding 400 grooves or every two months whichever is sooner
and every time there is a new operator, a new batch of abrasive, or a new abrasion wheel.
The abrasive flow rate shall be verified by pouring the material from a height of approximately 100 mm
into a pre-weighed rigid container with a smooth rim, of height (90 ± 10) mm and of known volume
when filled to the top, this shall be approximately 1 l. As the container fills, the pourer shall be raised to
approximately maintain the 100
...