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of an identical text or by endorsement, at the latest by August 2022, and conflicting national standards shall be withdrawn at the latest by August 2022.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_ref and μ_FAP definition;
— [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 (D₁ and D₂);
— [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_ref value transferred to 3.2;
— [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 8.1Formula (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.

BS EN 12697-49:2022

Bituminous mixtures. Test methods - Determination of friction after polishing

Current

Published:

31 Mar 2022