oSIST prEN 13450-1:2021

Aggregates for railway ballast - Part 1: Characteristics

This document specifies the characteristics of aggregates for use in the construction of the upper layer (superstructure) of railway track.
With regard to the material source and production process, this document covers natural aggregate (see 3.1.3), manufactured aggregate (see 3.1.4), recycled aggregates (see 3.1.5), and mixtures of these materials.
Aggregates covered in this document are railway ballast (see 3.1.2).
Railway ballast refers to aggregates where 100 % of the surface of the particles can be described as totally crushed (see 3.1.2) and that are obtained by processing natural, manufactured materials or recycled crushed unbound aggregates.
Aggregates covered in this document are coarse aggregates (see 3.1.10).
Railway ballast resulting of previously used railway ballast on site and without putting it on the market (reused railway ballast) is not covered by this document.
This document does not cover:
—   natural and manufactured aggregates, having oven-dried particle density less than or equal to 2,00 Mg/m3, as they are already specified in prEN 13055:2021,
—   recycled aggregates, with particle densities less than 1,50 Mg/m3,
—   aggregates with a nominal upper size greater than 90 mm,
—   armourstone, as this is specified in prEN 13383-1:2021,
—   aggregates for construction works, as these are specified in prEN17555-1:2021,
—   use of aggregates contained within reclaimed bituminous mixtures, as the reclaimed asphalt for use as a constituent of bituminous mixtures is already specified in EN 13108 8:2016,
—   use of aggregates as soil,
—   use of aggregates in earthworks, as these are specified in EN 16907:2018, Parts 1 to 6.

Gesteinskörnungen für Gleisschotter - Teil 1: Produktstandard

Dieses Dokument legt die Eigenschaften von Gesteinskörnungen für die Verwendung beim Bau der oberen Schicht (Oberbau) von Bahnkörpern fest.
Bezüglich des Ursprungs und Herstellungsverfahrens des Materials deckt dieses Dokument natürliche Gesteinskörnung (siehe 3.1.3), industriell hergestellte Gesteinskörnung (siehe 3.1.4), rezyklierte Gesteins¬körnungen (siehe 3.1.5) und Gemische dieser Materialien ab.
Bei den in diesem Dokument abgedeckten Gesteinskörnungen handelt es sich um Gleisschotter (siehe 3.1.2).
Gleisschotter bezieht sich auf Gesteinskörnungen, bei denen 100 % der Kornoberflächen als vollständig gebrochen (siehe 3.1.2) beschrieben werden können und die durch die Verarbeitung natürlicher oder industriell hergestellter Materialien oder gebrochener ungebundener rezyklierter Gesteinskörnungen gewonnen werden.
Bei den in diesem Dokument abgedeckten Gesteinskörnungen handelt es sich um grobe Gesteinskörnungen (siehe 3.1.10).
Gleisschotter, der aus an der Baustelle vorher verwendetem Gleisschotter stammt und nicht in Verkehr gebracht wurde (wiederverwendeter Gleisschotter), ist nicht Gegenstand dieses Dokuments.
Dieses Dokument deckt Folgendes nicht ab:
—   natürliche und industriell hergestellte Gesteinskörnungen mit einer Rohdichte auf ofentrockener Basis kleiner oder gleich 2,00 Mg/m3, wie bereits in prEN 13055:2021 festgelegt;
—   rezyklierte Gesteinskörnungen mit Rohdichten kleiner als 1,50 Mg/m3;
—   Gesteinskörnungen mit einem oberen Nennwert der Korngröße größer als 90 mm;
—   Wasserbausteine, wie in prEN 13383 1:2021 festgelegt;
—   Gesteinskörnungen für Bauwerke, wie in prEN 17555 1:2021 festgelegt;
—   Verwendung von Gesteinskörnungen in Ausbauasphaltmischgut, wie für Ausbauasphalt zur Verwendung als Bestandteil von Asphaltmischgut bereits in EN 13108 8:2016 festgelegt ist;
—   Verwendung von Gesteinskörnungen als Boden;
—   Verwendung von Gesteinskörnungen in Erdbauwerken, wie in EN 16907:2018, Teil 1 bis Teil 6, festgelegt.

Granulats pour ballasts de voies ferrées - Partie 1: Caractéristiques

Le présent document spécifie les caractéristiques des granulats destinés à être utilisés dans la construction de la couche supérieure (superstructure) des voies ferrées.
S’agissant de l’origine des matériaux et du processus de production, le présent document couvre les granulats naturels (voir 3.1.3), les granulats artificiels (voir 3.1.4), les granulats recyclés (voir 3.1.5), et les mélanges réalisés à partir de ces matériaux.
Les granulats couverts dans ce document sont le ballast de voie ferrée (voir 3.1.2).
Le ballast de voie ferrée désigne les granulats pour lesquels 100 % de la surface des grains peut être décrite comme étant entièrement concassée (voir 3.1.2) et qui sont obtenus par traitement de granulats concassés naturels, artificiels ou recyclés.
Les granulats couverts dans ce document sont les gravillons (voir 3.1.10).
Le ballast de voie ferrée obtenu à partir de ballast de voie ferrée ayant déjà été utilisé sur site et n’ayant pas été commercialisé (ballast de voie ferrée réutilisé) n’est pas couvert dans ce document.
Ce document ne couvre pas les aspects suivants :
—   les granulats naturels et artificiels dont la masse volumique réelle après séchage est inférieure ou égale à 2,00 Mg/m3, qui sont déjà spécifiés dans le projet de norme prEN 13055:2021,
—   les granulats recyclés dont la masse volumique réelle est inférieure à 1,50 Mg/m3,
—   les granulats dont la dimension maximale nominale est supérieure à 90 mm,
—   les enrochements, qui sont déjà spécifiés dans le projet de norme prEN 13383-1:2021,
—   les granulats pour travaux de construction, qui sont déjà spécifiés dans le projet de norme prEN17555-1:2021,
—   l’utilisation de granulats présents dans les mélanges hydrocarbonés de réemploi, l’asphalte de réemploi utilisé comme constituant des mélanges hydrocarbonés étant déjà spécifié dans l’EN 13108 8:2016,
—   l’utilisation de granulats comme sol,
—   l’utilisation de granulats dans les terrassements, qui sont déjà spécifiés dans l’EN 16907:2018, Parties 1 à 6.

Agregati za grede železniških prog - 1. del: Značilnosti

General Information

• Status: Not Published
• Public Enquiry End Date: 01-Sep-2021
• ICS: 91.100.15 - Mineral materials and products
• ICS: 93.100 - Construction of railways
• Technical Committee: AGR - Aggregates
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Jun-2021
• Due Date: 28-Oct-2021
• Completion Date: 24-Aug-2021
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/125 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on aggregates
• Ref Project: prEN 13450-1 - Aggregates for railway ballast - Part 1: Characteristics

Relations

• Revised: SIST EN 13450:2003 - Aggregates for railway ballast
• Effective Date: 22-Jul-2020
• Revised: SIST EN 13450:2003/AC:2004 - Aggregates for railway ballast
• Effective Date: 22-Jul-2020
• Revised: SIST EN 13450:2003 - Aggregates for railway ballast
• Effective Date: 18-Jan-2023
• Revised: SIST EN 13450:2003/AC:2004 - Aggregates for railway ballast
• Effective Date: 18-Jan-2023
• Revised: SIST EN 13450:2003 - Aggregates for railway ballast
• Effective Date: 19-Jan-2023
• Revised: SIST EN 13450:2003/AC:2004 - Aggregates for railway ballast
• Effective Date: 19-Jan-2023
• Revised: SIST EN 13450:2003 - Aggregates for railway ballast
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 13450-1:2021
01-september-2021
Agregati za grede železniških prog - 1. del: Značilnosti
Aggregates for railway ballast - Part 1: Characteristics
Gesteinskörnungen für Gleisschotter - Teil 1: Produktstandard
Granulats pour ballasts de voies ferrées - Partie 1: Caractéristiques
Ta slovenski standard je istoveten z: prEN 13450-1
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
93.100 Gradnja železnic Construction of railways
oSIST prEN 13450-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 13450-1:2021

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oSIST prEN 13450-1:2021


DRAFT
EUROPEAN STANDARD
prEN 13450-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

June 2021
ICS 91.100.15; 93.100 Will supersede EN 13450:2002
English Version

Aggregates for railway ballast - Part 1: Characteristics
Granulats pour ballasts de voies ferrées - Partie 1: Gesteinskörnungen für Gleisschotter - Teil 1:
Caractéristiques Produktstandard
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 154.

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, 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.

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: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13450-1:2021 E
worldwide for CEN national Members.

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prEN 13450-1:2021 (E)
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols, and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviated terms . 8
4 Characteristics . 9
4.1 Particle size, shape and density . 9
4.1.1 Particle size . 9
4.1.2 Particle shape . 10
4.1.3 Particle density . 11
4.2 Resistance to fragmentation . 12
4.2.1 General. 12
4.2.2 Los Angeles coefficient . 12
4.2.3 Impact value . 12
4.3 Resistance to attrition . 13
4.4 Cleanliness. 13
4.4.1 General. 13
4.4.2 Composition . 13
4.4.3 Content of fine particles . 13
4.4.4 Fines content . 14
4.5 Durability . 14
4.5.1 General. 14
4.5.2 Water absorption . 14
4.5.3 Resistance to weathering - Magnesium sulfate soundness. 14
4.5.4 Freeze – thaw resistance . 15
4.5.5 Resistance to “Sonnenbrand” . 16
5 Sampling and testing methods . 16
6 Assessment and Verification of Constancy of Performance - AVCP . 16
6.1 General. 16
6.2 Assessment of performance . 17
6.2.1 General. 17
6.2.2 Test samples, testing and assessment criteria . 17
6.3 Verification of constancy of performance . 18
6.3.1 Factory production control (FPC) . 18
6.3.2 Initial inspection of factory and of FPC . 21
6.3.3 Continuous surveillance of FPC . 22
7 Marking, labelling and packaging . 22
Annex ZA (informative) Relationship of this European Standard with Regulation (EU)
No.305/2011 . 23
Bibliography . 27
2

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prEN 13450-1:2021 (E)
European foreword
This document (prEN 13450-1:2021) has been prepared by Technical Committee CEN/TC 154
“Aggregates”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13450:2002 and EN 13450:2002/AC:2004.
The most significant technical changes compared to EN 13450:2002 include:
a) Complete structural and editorial revision;
b) Harmonization of vocabulary and Annex ZA to be consistent with Regulation (EU) 305/2011 on
construction products (CPR);
c) Improvement of the consistency with the aggregate standard EN 17555-1;
d) Unification of definitions which were common across aggregate standard EN 17555-1;
e) Updating and improving references to supporting test methods;
a) Modification of the definition of “recycled railway ballast”;
f) Modification of classes for grading;
g) Modification of Tables 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, due to changes in the class names and due to the
introduction of new classes for flakiness index, percentage of crushed particles, Los Angeles
coefficient, resistance to impact and micro Deval coefficient;
h) Addition of new Clauses 4.1.2.4 “Percentage of crushed particles”, 4.5.4 “Freeze-thaw resistance”;
i) Addition of new Tables 11, 12, 13, 14, and 15;
j) Revision of Clause 4.5.5 “Sonnenbrand”;
k) Removal of clauses referring to dangerous substances;
l) Removal of simple petrographic description from the characteristics and inclusion instead under the
marking, labelling and packaging clause;
m) Removal of Annex A (informative) “Sampling railway ballast at the construction site either from a
railway wagon or from the track”, Annex B (informative) “Guidance on interpretation of results when
samples of railway ballast have been taken from railway wagon or from track”, Annex C (normative)
“Conditions to be applied to the test procedure specified in EN 1097-2:2010 for testing the Los
Angeles coefficient of railway ballast”, Annex D (normative) “Conditions to be applied to the test
procedure specified in EN 1097-2:2010 for testing the Impact value of railway ballast”, Annex E
(normative) “Conditions to be applied to the test procedure specified in EN 1097-1:2011 for
determination of the resistance to wear (micro-Deval) of railway ballast”; Annex F (normative)
“Conditions to be applied to the test procedure specified in EN 1367-1 for determination of the
resistance to freezing and thawing of railway ballast”, Annex G (normative) “Conditions to be applied
to the test procedure specified in EN 1367-2 for the determination of the resistance of railway ballast
to the magnesium sulfate test”, Annex H (informative) “Guidance on the freezing and thawing
resistance of railway ballast” and Annex I (normative) “Factory production control”;
3

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prEN 13450-1:2021 (E)
n) Modification of the clauses on Designation and description and on Marking, labelling and packaging;
o) Restructuring of all clauses to be in line with the requirements of the Construction Product
Regulation;
p) Introduction of revised AVCP clauses and tables, although minimum test frequencies are almost
unchanged.
Provisions for other types of aggregates and their intended uses are specified in the following European
Standards:
— prEN 17555-1:2021, Aggregates for construction works — Part 1: Characteristics
— prEN 13055:2021, Lightweight aggregates
— prEN 13383-1:2021, Armourstone — Part 1: Characteristics
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
For relationship with Regulation (EU) No. 305/2011 on construction products (CPR), see informative
Annex ZA, which is an integral part of this document.
4

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prEN 13450-1:2021 (E)
1 Scope
This document specifies the characteristics of aggregates for use in the construction of the upper layer
(superstructure) of railway track.
With regard to the material source and production process, this document covers natural aggregate (see
3.1.3), manufactured aggregate (see 3.1.4), recycled aggregates (see 3.1.5), and mixtures of these
materials.
Aggregates covered in this document are railway ballast (see 3.1.2).
Railway ballast refers to aggregates where 100 % of the surface of the particles can be described as totally
crushed (see 3.1.2) and that are obtained by processing natural, manufactured materials or recycled
crushed unbound aggregates.
Aggregates covered in this document are coarse aggregates (see 3.1.10).
Railway ballast resulting of previously used railway ballast on site and without putting it on the market
(reused railway ballast) is not covered by this document.
This document does not cover:
— natural and manufactured aggregates, having oven-dried particle density less than or equal to
3
2,00 Mg/m , as they are already specified in prEN 13055:2021,
3
— recycled aggregates, with particle densities less than 1,50 Mg/m ,
— aggregates with a nominal upper size greater than 90 mm,
— armourstone, as this is specified in prEN 13383-1:2021,
— aggregates for construction works, as these are specified in prEN17555-1:2021,
— use of aggregates contained within reclaimed bituminous mixtures, as the reclaimed asphalt for use
as a constituent of bituminous mixtures is already specified in EN 13108-8:2016,
— use of aggregates as soil,
— use of aggregates in earthworks, as these are specified in EN 16907:2018, Parts 1 to 6.
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.
prEN 932-3:2021, Tests for general properties of aggregates — Part 3: Procedure and terminology for
simplified petrographic description
prEN 933-1:2021, Tests for geometrical properties of aggregates — Part 1: Determination of particle size
distribution - Sieving method
EN 933-3:2012, Tests for geometrical properties of aggregates - Part 3: Determination of particle shape -
Flakiness index
EN 933-4:2008, Tests for geometrical properties of aggregates - Part 4: Determination of particle shape -
Shape index
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prEN 13450-1:2021 (E)
prEN 933-5:2021, Tests for geometrical properties of aggregates — Part 5: Determination of percentage of
crushed and broken surfaces in coarse aggregate particles
prEN 1097-1:2021, Tests for mechanical and physical properties of aggregates — Part 1: Determination of
the resistance to wear (micro-Deval)
EN 1097-2:2020, Tests for mechanical and physical properties of aggregates - Part 2: Methods for the
determination of resistance to fragmentation
prEN 1097-6:2021, Tests for mechanical and physical properties of aggregates — Part 6: Determination of
particle density and water absorption
EN 1367-1:2007, Tests for thermal and weathering properties of aggregates - Part 1: Determination of
resistance to freezing and thawing
EN 1367-2:2009, Tests for thermal and weathering properties of aggregates — Part 2: Magnesium sulfate
test
1
EN 1367-3:2001, Tests for thermal and weathering properties of aggregates — Part 3: Boiling test for
“Sonnenbrand basalt”
EN 1367-6:2008, Tests for thermal and weathering properties of aggregates - Part 6: Determination of
resistance to freezing and thawing in the presence of salt (NaCl)
3 Terms, definitions, symbols, and abbreviated terms
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:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1 Terms and definitions
3.1.1
aggregate
granular material of natural, manufactured or recycled origin used in construction
3.1.2
railway ballast
aggregate where 100 % of the surface of the particles can be described as totally crushed used in the
construction of the upper layer (superstructure) of railway track
3.1.3
natural railway ballast
aggregate for railway ballast from mineral sources that has been subjected to nothing more than
mechanical processing

1
As impacted by EN 1367-3:2001/AC:2004.
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prEN 13450-1:2021 (E)
3.1.4
manufactured railway ballast
railway ballast of mineral origin resulting from an industrial process involving thermal or other
modification
Note 1 to entry: Manufactured aggregates (not including added filler) are of different types, including those,
namely air-cooled blast furnace slags, steel slags and foundry cupola furnace slags, for which this standard defines
application of specific test methods to cover some essential characteristics.
3.1.5
recycled railway ballast
railway ballast resulting from the processing of inorganic mineral material previously used as railway
ballast in the upper layer (superstructure) of the railway track
Note 1 to entry: Railway ballast resulting of previously used railway ballast on site and without putting it on the
market (reused railway ballast) is not covered by this document.
3.1.6
railway ballast size
designation of railway ballast in terms of lower (d) and upper (D) sieve sizes expressed as d/D
Note 1 to entry: Sieve sizes are selected from those in EN 933-2:2020.
Note 2 to entry: This designation accepts the presence of some particles which are retained on the upper sieve
(oversize) and some which pass the lower sieve (undersize).
3.1.7
grading
particle size distribution expressed as the percentages by mass passing a specified set of sieves
3.1.8
fine particles
particle size fraction of railway ballast which passes the 0,5 mm sieve
3.1.9
fines
particle size fraction of an railway ballast that passes the 0,063 mm sieve
3.1.10
coarse aggregate
designation given to the larger aggregate sizes with D greater than 4 mm and d greater than or equal to
1 mm
3.1.11
particle size fraction
fraction of an aggregate passing the larger of two sieves and retained on the smaller
Note 1 to entry: The lower limit can be zero.
3.1.12
oversize
part of the aggregate retained on the upper of the limiting sieves used in aggregate size description
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3.1.13
undersize
part of the aggregate passing the lower of the limiting sieves used in aggregate size description
3.1.14
product family
group of products produced by one manufacturer for which the assessment results for one or more
characteristics from any one product within the range are valid for all other products within this range
3.2 Symbols and abbreviated terms
For the purposes of this document, the following symbols and abbreviations apply:
Symbol/Acronym Meaning
AVCP Assessment and Verification of Constancy of Performance
C (Percentage of) Crushed particles
DoP Declaration of performance
d lower sieve size designation in mm
D upper sieve size designation in mm
d/D Aggregate size designation
D/d Ratio of upper to lower sieve size
f Fines content
F Freeze thaw resistance
RB
F Freeze thaw resistance in the presence of salt (extreme conditions)
EC
FI Flakiness Index
G Grading
CRB
G Content of fine particles
FRB
L Length
RB
LA Los Angeles coefficient
RB
M Micro-Deval coefficient
DERB
MS Magnesium Sulfate soundness
RB
NaCl Sodium Chloride
SI Shape Index
SZ Impact value
RB
NOTE The subindex RB stands for Railway Ballast and is used when the general test method is particularised
for it. Subindex CRB stands for Coarse Railway Ballast and subindex FRB stands for Fine Railway Ballast.
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4 Characteristics
4.1 Particle size, shape and density
4.1.1 Particle size
4.1.1.1 General
The characteristic that describes particle size of railway ballast is the particle size distribution (or
grading).
4.1.1.2 Grading
The grading of the railway ballast shall be determined by sieving in accordance with prEN 933-1:2021.
The performance shall be expressed as a grading class in accordance with the provisions of Table 1.
Table 1 — Grading classes for railway ballast
Percentage passing by mass

Designation
11,2 mm
Sieve size 31,5 mm 22,4 mm 16 mm to X mm to Y
31,5 mm to 63 mm to
mm to 50 mm to 40 mm 31,5 mm mm
31,5 mm
Grading class

G
CRB
G
CRB Stated

G A G B G C G D G E G F G G
CRB CRB CRB CRB CRB CRB CRB
X/Y
80 - 100 100 100 - - - 100
63 100 95 to 100 95 to 100 93 to 100 - - - X to 100
50 70 to 99 65 to 99 55 to 99 45 to 70 100 100 - -
40 30 to 65 30 to 65 25 to 75 15 to 40 90 to 100 97 to 100 100 -
31,5 1 to 25 1 to 25 1 to 25 0 to 7 60 to 98 70 to 100 90 to 100 -
22,4 0 to 3 0 to 3 0 to 3 0 to 7 15 to 60 0 to 40 - -
16 - - - - 0 to 15 0 to 3 - -
11,2 - - - - - - 0 to 4 -
8 - - - - 0 to 2 - - -
4 - - - - - - 0 to 1 0 to Y
31,5 to 50 50 to 100 - - - - - - -
31,5 to 63 - 70 to 100 70 to 100 86 to 100 - - - -
NOTE 1  The provision for passing the 22,4 mm sieve applies to railway ballast sampled at the place of
production. This characteristic may change due to transportation and handling.
NOTE 2  For classes G A to G D a 25 mm sieve may be used as an alternative to the 22,4 mm sieve, then a
CRB CRB
tolerance of 0 to 5 would apply (0 to 7 for class D).
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4.1.2 Particle shape
4.1.2.1 General
The shape, the length and the percentage of crushed particles are the characteristics that define together
the dimensional shape of railway ballast.
4.1.2.2 Flakiness index and shape index
4.1.2.2.1 General
There are two test methods for the determination of shape of railway ballast: flakiness index and shape
index. The flakiness index shall be the reference test for the determination of the particle shape.
4.1.2.2.2 Flakiness index
Flakiness index of railway ballast shall be determined in accordance with EN 933-3:2012, based on the
4/D mm test fraction.
The results obtained shall be evaluated against the criterion for the respective class in Table 2.
The performance shall be expressed as a class in accordance with Table 2.
Table 2 — Classes for maximum values of flakiness index
Class
Maximum values of Flakiness
Index
FI
0 to 15 FI 15
0 to 20 FI 20
0 to 25 FI 25
4 to 25 FI 4/25
0 to X, where X > 25 FI X
Stated
4.1.2.2.3 Shape index
The shape index of railway ballast shall be determined in accordance with EN 933-4:2008.
The results obtained shall be evaluated against the criterion for the respective class in Table 3.
The performance shall be expressed as a class in accordance with Table 3.
Table 3 — Classes for maximum values of shape index
Class
Maximum values of Shape Index
SI
0 to 10 SI 10
0 to 20 SI 20
0 to 30 SI 30
5 to 30 SI 5/30
0 to X, where X > 30 SI X
Stated
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4.1.2.3 Particle length
Particle length of railway ballast shall be determined with an appropriate gauge or calliper, by measuring
the maximum size of the particles of the sample of 40 kg and calculating the percentage by mass of
particles with length ≥ 100 mm.
The results obtained shall be evaluated against the criterion for the respective class in Table 4.
The performance shall be expressed as a class in accordance with Table 4.
Table 4 — Classes for maximum values of particle length
Percentage by mass with length ≥ 100 mm in a sample greater than 40 kg
Particle length category
L
RB
L A L B L C L D L X
RB RB RB RB RB Stated
0 to 4 0 to 6 0 to 8 0 to 12 0 to X, where
X > 12
4.1.2.4 Percentage of crushed particles
The percentage of crushed particles, totally crushed particles and totally rounded particles of railway
ballast shall be assessed, either:
a) without testing (WT), where the aggregates are obtained from crushing of massive rock;
or
b) based on determination of the percentages of crushed particles, totally crushed particles and totally
rounded particles in accordance with prEN 933-5:2021.
In case b), the results obtained shall be evaluated against the criterion for the respective class in Table 5.
The performance shall be expressed as a class:
a) in case a) as class C 90/100/0/ (WT);
b) in case b) as a class in accordance with Table 5.
Table 5 — Classes for the percentages of totally crushed particles, crushed particles and of
totally rounded particles
Percentage of totally Percentage of totally
Percentage of
Class
crushed particles by crushed particles by rounded particles by
C
mass
mass mass
90 to 100 100 0 C 90/100/0
4.1.3 Particle density
The particle density of railway ballast shall be determined in accordance with prEN 1097-6:2021,
Annex B.
3
The performance shall be expressed as a level in Mg/m , stating the means of determination.
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oSIST prEN 13450-1:2021
prEN 13450-1:2021 (E)
4.2 Resistance to fragmentation
4.2.1 General
There are two test methods for the determination of resistance to fragmentation / crushing of railway
ballast: the Los Angeles coefficient and the impact value. The Los Angeles coefficient shall be the reference
test.
4.2.2 Los Angeles coefficient
Los Angeles coefficient of railway ballast shall be determined in accordance with EN 1097-2:2020,
Annex A.
The results obtained shall be evaluated against the criterion for the respective class in Table 6.
The performance shall be expressed as a class in accordance with Table 6.
Table 6 — Classes for resistance to fragmentation - Los Angeles coefficient
Class
Maximum Los Angeles coefficient
LA
RB
0 to 12 LA 12
RB
0 to 14 LA 14
RB
0 to 16 LA 16
RB
0 to 18 LA 18
RB
0 to 20 LA 20
RB
0 to 22 LA 22
RB
0 to 24 LA 24
RB
0 to X, where X > 24 LA X
RB Stated
4.2.3 Impact value
The Impact value of railway ballast shall be determined in accordance with EN 1097-2:2020, Annex A.
The results obtained shall be evaluated against the criterion for the respective class in Table 7.
The performance shall be expressed as a class in accordance with Table 7.
Table 7 — Classes for resistance to fragmentation - impact value
Maximum Impact value Class
% SZ
RB
0 to 14 SZ 14
RB
0 to 18 SZ 18
RB
0 to 20 SZ 20
RB
0 to 22 SZ 22
RB
0 to X, where X > 22 SZ X
RB Stated
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oSIST prEN 13450-1:2021
prEN 13450-1:2021 (E)
4.3 Resistance to attrition
The test method for the determination of resistance to attrition of railway ballast is the micro-Deval
coefficient.
The resistance to wear (in terms of the Micro-Deval coefficient - M ) of railway ballast shall be
DE RB
determined in accordance with prEN 1097-1:2021, Annex A.
The results obtained shall be evaluated against the criterion for the respective class in Table 8.
The performance shall be expressed as a class in accordance with Table 8.
Table 8 — Classes for resistance to attrition
Maximum Micro-Deval Class
coefficient M
DE RB
0 to 5 M 5
DE RB
0 to 7 M 7
DE RB
0 to 9 M 9
DE RB
0 to 11 M 11
DE RB
0 to 13 M 13
DE RB
0 to 15 M 15
DE RB
0 to X, where X > 15 M X
DE RB Stated
4.4 Cleanliness
4.4.1 General
The composition, the content of fine particles and the fines content are the characteristics that define
together the cleanliness of railway ballast.
4.4.2 Composition
Railway ballast shall not contain other components or matter than specified in this standard.
4.4.3 Content of fine particles
The content of fines particles of railway ballast shall be determined in accordance with prEN 933-1:2021.
The results obtained shall be evaluated against the classification criteria for the relevant grading in
Table 9.
The performance shall be expressed as a class in accordance with the provisions of Table 9.
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oSIST prEN 13450-1:2021
prEN 13450-1:2021 (E)
Table 9 — Classes for maximum values of fine particles content
Maximum percentage passing by mass

Sieve Fine particle class
size G
FRB
mm G
...