EN 12697-49:2022

SLOVENSKI STANDARD
01-april-2022
Nadomešča:
SIST EN 12697-49:2014
Bitumenske zmesi - Preskusne metode - 49. del: Ugotavljanje tornih sposobnosti
po poliranju
Bituminous mixtures - Test methods - Part 49: Determination of friction after polishing
Asphalt - Prüfverfahren - Teil 49: Messung der Griffigkeit nach dem Polieren
Mélanges bitumineux - Méthodes d’essai - Partie 49 : Détermination du frottement après
polissage
Ta slovenski standard je istoveten z: EN 12697-49:2022
ICS:
93.080.20 Materiali za gradnjo cest Road construction materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12697-49
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2022
EUROPÄISCHE NORM
ICS 93.080.20 Supersedes EN 12697-49:2014
English Version
Bituminous mixtures - Test methods - Part 49:
Determination of friction after polishing
Mélanges bitumineux - Méthodes d'essai - Partie 49 : Asphalt - Prüfverfahren - Teil 49: Messung der
Détermination du frottement après polissage Griffigkeit nach dem Polieren
This European Standard was approved by CEN on 15 November 2021.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12697-49:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, symbols and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviated terms . 8
4 Principle . 9
5 Equipment . 9
5.1 Test device . 9
5.2 Control plate for comparative measurements . 15
5.3 Sand-blasting-equipment . 15
6 Other materials . 15
6.1 Quartz powder . 15
6.2 Water quartz powder mixture . 15
6.3 Corundum . 15
7 Test method . 16
7.1 Preparation of the specimens . 16
7.2 Polishing procedure . 16
7.3 Friction measurement . 17
8 Calculation and expression of the results . 18
8.1 Friction result μ on a single specimen . 18
FAP
8.2 Determination of FAP . 19
9 Test report . 19
10 Precision . 19
Annex A (informative) Example of polishing head and friction unit . 20
Annex B (informative) Results obtained from the curve FAP against passes . 21
B.1 General . 21
B.2 Results obtained from the curve FAP against passes . 21
Annex C (informative) National experiences . 22
C.1 General . 22
C.2 National experiences . 22
Bibliography . 29
European foreword
This document (EN 12697-49:2022) has been prepared by Technical Committee CEN/TC 227 “Road
materials”, 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 August 2022, and conflicting national standards shall
be withdrawn at the latest by August 2022.
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 12697-49:2014.
The main changes compared to the previous edition are listed below:
— The title no longer refers to hot mix asphalt;
— [Introduction] added, giving the general context of the test method and the need to improve it;
— [1] Possibility of following Friction After Polishing (FAP) evolution as a function of the number of
polishing passes. NOTE deleted since the Wehner and Schulze method is now mentioned in the
Introduction;
— [2] and [5.1.4.5] Change of normative reference to ISO 48-4 for the determination of Shore
hardness;
— [3.1.1] Rewording of the definition of pass, and information given as a Note to entry;
— [3.1.2] Definition of FAP added;
— [3.2] Title completed;
— [3.2] Introduction of the symbol µ, and rewording of μ and μ definition;
ref FAP
— [3.2] Deletion of the symbol Ø;
— [5.1.1] Addition of reference to Annex A;
— [5.1.1] Completed with obligation to work in specified temperature and humidity room conditions;
— [5.1.2.3] Requirements for H modified (value and tolerance);
— [5.1.2.3] Figure 2 corrected (D and D );
1 2
— [5.1.2.3] Introduction of additional requirements for polishing rollers storage;
— [5.1.2.3] Modification of requirement for the number of conditioning passes;
— [5.1.2.5] Addition of a clause about the washing device;
— [5.1.4] Rewording of title;
— [5.1.4.2] Rewording of title, and deletion of the requirement for inertia moment;
— [5.1.4.3] Modification the title. And “moment” replaced by “torque” in all the document;
— [5.1.4.3] Modification of the tolerance for torque measurement;
— [5.1.4.5] Modification of the criteria for resilience of sliding blocks. Deletion of Table 1 and following
paragraph. Following tables renumbered accordingly;
— [5.1.4.5] Figure 4 corrected since it was mirror inverted. Correction of the rotation radius value;
— [5.2] Rewording of title, definition of μ value transferred to 3.2;
ref
— [5.3] Additional requirements for sand-blasting equipment;
— [6.1] Additional recommendations for quartz powder;
— [6.2] Additional requirements for water/quartz-powder mixture;
— [6.3] Addition of a footnote about the supplier of corundum;
— [7.1.1] Addition of a new sub-heading “7.1.1 General”. Following subclauses renumbered
accordingly;
— [7.1.1] Achievement – or not – of sandblasting according to the test and/or product context;
— [7.1.2] Rewriting of sandblasting procedure, and change of storage position;
— [7.1.3] Modification of thickness requirement and change of storage position;
— [7.1.4] New clause added for the conditioning of specimens;
— [7.2] Polishing procedure completed for conditioning, water/quartz-powder mixture, washing;
— [7.2] Clause now subdivided in tree sub clauses;
— [7.2.3] Clarification of the number of passes for “other applications”;
— [7.2.3] Requirement for the consistency of torque value imported from 5.1.2.3;
— [7.3.1] Obligation of pre-test check for each specimen;
— [7.3.2] Additional dispositions about water introduction, torque values recording and control plate
test;
— [8.1] Title modified and Clause totally rewritten for more clarity and consistency;
— [8.1] Formula (1) modified;
— [8.2] Formula (2) moved to 8.1 Formula (3);
— [8.2] Rewording of the criterion for validating the test, and possibility of a curve FAP against passes;
— [9] Information to be reported simplified. Added references to Clauses 8.1 and 8.2 for the
calculation;
— [10] Update of the precision values;
— [Annex A] In Figure A.1, correction of the key line 4;
— [Annex B] New informative annex added to provide results from the curve FAP against passes;
— [Annex C] New informative annex added to provide information about national experiences;
— [Bibliography] Updated.
A list of all parts in the EN 12697 series can be found on the CEN website.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Introduction
Regarding skid resistance of road surfaces, the test of the polished stone value, PSV according to
EN 1097-8 has long been a reference [1]. It characterizes a curved specimen of a coarse aggregate, but
cannot alone predict the adhesion of a bituminous mixture once it is in place. A second limit is that it
characterizes one surface state of the coarse aggregate, but does not provide any information about its
speed of evolution under a polishing action.
In the 1960s Pr B. Wehner and K.-H. Schulze developed testing devices, able to polish and characterize
the skid resistance of a flat specimen, of coarse aggregate, sand, or bituminous mixture, and to follow
its evolution as a function of the number of polishing passes [2]. After different developments of the so-
called “Wehner and Schulze apparatus”, this test method, applied to bituminous mixtures, became in
2014 the European Standard EN 12697-49, Bituminous mixtures - Test methods for hot mix asphalt - Part
49: Determination of friction after polishing. It characterizes one surface state of a bituminous mixture
after a fixed number of polishing passes.
The use of this standard in different European countries (see Annex C) in recent years, in contexts of
tenders and/or research, brought to light the need to improve it in both metrological and operating
aspects. It is the subject of thi
...