Tests for mechanical and physical properties of aggregates - Part 8: Determination of the polished stone value

This document describes the reference method used for type testing and in case of dispute for determining the polished stone value (PSV) of a coarse aggregate used in road surfacings. For other purposes, in particular factory production control, other methods are possible provided that an appropriate working relationship with the reference method has been established. Examples of advanced test methods can be found in the Bibliography.
Annex A describes an optional method for the determination of the aggregate abrasion value (AAV).
NOTE 1   The AAV method is suitable to use when particular types of skid resistant aggregates, (typically those with a PSV of 60 or greater) which can be susceptible to abrasion under traffic, are required.
The sample is taken from normal run of production from the plant.
NOTE 2   Chippings that have been freshly crushed in the laboratory or recovered from bituminous materials may give misleading results.

Prüfverfahren für mechanische und physikalische Eigenschaften von Gesteinskörnungen - Teil 8: Bestimmung des Polierwertes

Dieses Dokument legt das für die Erstprüfung und im Streitfall anzuwendende Referenzverfahren für die Bestimmung des Polierwerts (en: polished stone value, PSV) einer groben Gesteinskörnung für Straßenoberflächen fest. Für andere Zwecke, speziell im Rahmen der werkseigenen Produktionskontrolle, sind auch andere Verfahren möglich, sofern ein ausreichender Zusammenhang zum Referenzverfahren nachgewiesen wurde. Beispiele für fortschrittliche Prüfverfahren können den Literaturhinweisen entnommen werden.
Im Anhang A ist ein optionales Verfahren zur Bestimmung des Abriebwertes einer Gesteinskörnung (en: aggregate abrasion value, AAV) beschrieben.
ANMERKUNG 1   Das AAV-Verfahren ist geeignet, wenn bestimmte Arten von griffigen Gesteinskörnungen (üblicherweise Gesteine mit einem PSV von 60 oder darüber), die anfällig gegen Abrieb unter Verkehrsbelastung sein können, benötigt werden.
Die Probe wird aus der normalen Produktion im Werk entnommen.
ANMERKUNG 2   Frisch im Laboratorium gebrochenes oder aus Asphalt rückgewonnenes Material kann zu verfälschenden Ergebnissen führen.

Essais pour déterminer les caractéristiques mécaniques et physiques des granulats - Partie 8 : Détermination du coefficient de polissage accéléré

Ce document décrit la méthode de référence utilisée pour les essais de type initiaux et en cas de litige pour déterminer le coefficient de polissage accéléré (PSV) des gravillons utilisés dans les revêtements des routes. À d’autres fins, en particulier pour le contrôle de la production en usine, d’autres méthodes sont envisageables sous réserve qu’une corrélation appropriée avec la méthode de référence ait été établie. Des exemples de méthodes d'essai avancées sont disponibles dans la bibliographie.
L'Annexe A décrit une méthode facultative pour la détermination de la valeur d’abrasion des granulats (AAV).
NOTE 1 La méthode AAV peut être utilisée lorsque des types particuliers de granulats antidérapants (ceux, généralement, dont le PSV est égal ou supérieur à 60) sensibles à l’abrasion occasionnée par la circulation, sont exigés.

Preskusi mehanskih in fizikalnih lastnosti agregatov - 8. del: Določevanje vrednosti količnika zaglajevanja kamenih zrn

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Status
Published
Publication Date
14-Apr-2020
Withdrawal Date
30-Oct-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
15-Apr-2020
Due Date
25-Mar-2020
Completion Date
15-Apr-2020

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SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 1097-8:2009
Preskusi mehanskih in fizikalnih lastnosti agregatov - 8. del: Določevanje
vrednosti količnika zaglajevanja kamenih zrn
Tests for mechanical and physical properties of aggregates - Part 8: Determination of the
polished stone value
Prüfverfahren für mechanische und physikalische Eigenschaften von Gesteinskörnungen
- Teil 8: Bestimmung des Polierwertes
Essais pour déterminer les caractéristiques mécaniques et physiques des granulats -
Partie 8: Détermination du coefficient de polissage accéléré
Ta slovenski standard je istoveten z: EN 1097-8:2020
ICS:
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.

EN 1097-8
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 91.100.15 Supersedes EN 1097-8:2009
English Version
Tests for mechanical and physical properties of aggregates
- Part 8: Determination of the polished stone value
Essais pour déterminer les caractéristiques Prüfverfahren für mechanische und physikalische
mécaniques et physiques des granulats - Partie 8 : Eigenschaften von Gesteinskörnungen - Teil 8:
Détermination du coefficient de polissage accéléré Bestimmung des Polierwertes
This European Standard was approved by CEN on 24 February 2020.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1097-8:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 7
5 Materials . 7
5.1 General . 7
5.2 Materials . 7
6 Apparatus . 8
6.1 General . 8
6.2 Accelerated polishing machine . 8
6.3 Friction tester . 11
6.4 Test sieves . 14
6.5 Grid sieve . 14
6.6 Length gauge or callipers . 14
6.7 Equipment for preparing test specimens . 14
7 Preparation of test specimens . 15
8 Conditioning of the rubber-tyred wheel . 16
9 Accelerated polishing of specimens . 16
10 Friction test procedure . 18
11 Calculation and expression of results . 21
12 Test report . 22
12.1 Required data . 22
12.2 Optional data . 22
Annex A (normative) Determination of aggregate abrasion value (AAV) . 23
A.1 General . 23
A.2 Principle . 23
A.3 Materials . 23
A.4 Apparatus . 24
A.4.1 General . 24
A.4.2 Abrasion machine . 24
A.4.3 Test sieves . 24
A.4.4 Grid sieve . 24
A.4.5 Balance . 25
A.4.6 Small fine-haired brushes . 25
A.4.7 Brush . 25
A.4.8 Clamp . 25
A.5 Preparation of test specimens . 25
A.5.1 Test portion . 25
A.5.2 Specimens . 25
A.6 Procedure . 25
A.7 Calculation and expression of results . 26
A.8 Test report . 26
Annex B (normative) Control of materials – Corn emery and emery flour . 27
Annex C (normative) Calibration of the accelerated polishing machine . 28
C.1 Control of rubber-tyred wheels . 28
C.2 Accelerated polishing machine . 28
C.3 Rate of flow of corn emery and emery flour . 30
Annex D (normative) Calibration of the friction tester and sliders . 31
D.1 Friction tester . 31
D.1.1 General . 31
D.1.2 Mass of pendulum arm and pointer . 31
D.1.3 Balancing of the pendulum arm assembly . 31
D.1.4 Setting the effective spring tension . 31
D.1.5 Setting the pointer stop . 31
D.2 Control of sliders and slider rubber . 32
Annex E (normative) Friction tester reference stone specimen preparation and friction
slider conditioning . 33
E.1 General . 33
E.2 Preparation and initial testing of friction tester reference stone specimens . 33
E.3 Slider conditioning . 33
Annex F (informative) Precision for the aggregate abrasion value (AAV) . 34
F.1 General . 34
F.2 Precision values for repeatability and reproducibility . 34
Bibliography . 35
European foreword
This document (EN 1097-8:2020) has been prepared by Technical Committee CEN/TC 154
“Aggregates”, the secretariat of which is held by BSI.
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 October 2020, and conflicting national standards shall
be withdrawn at the latest by October 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 1097-8:2009.
The main technical changes compared to the previous version are the following:
— Clauses 5 and A.3 about sampling have been deleted as sufficient information is given in the Scope
and in 8.1. Consequently, all clauses have been renumbered.
— New Clause 5 Materials has been restructured.
— Grading requirements for corn emery have been completed (Table 1).
— Requirements for emery flour have been added (5.2.2).
— The sources of PSV control stone and friction tester reference stone have been changed (5.2.3 and
5.2.4).
— The feed mechanisms for corn emery and emery flour have been clarified (6.2.5 and 6.2.6).
— The friction tester design has been clarified (6.3).
— The range of test sieves has been extended (6.4).
— The precision of grid sieve bar spacing has been changed (6.5).
— Notes with normative text have been transformed into main text or deleted (6.2.7, 7.4 and A.5.2).
— An illustration of correct and incorrect prepared test specimens has been added (7.5).
— Instructions for clamping specimens around the road wheel have been given (9.3).
— The precision of corn emery feed rate has been changed (9.4).
— The time between water storage and accelerated polishing of specimens has been limited (9.8).
— The friction test procedure has been rewritten and supplemented with illustrations showing the
positioning of test specimens (Clause 10).
— The PSV control stone has been changed and the specified range adapted (11.2).
— Formula (1) has been adapted to the new control stone (11.3.3).
— The test report content has been adapted to the current rules (Clause 12).
— The temperature for conditioning rubber-tyred wheels has
...

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