Tests for mechanical and physical properties of aggregates
Part 8: Determination of the polished stone value
bsi.
English Version
Tests for mechanical and physical properties of aggregates -Part 8: Determination of the polished stone value
PrufverfahrenfurmechanischeundphysikalischeEigenschaften von Gesteinskornungen-Teil 8:Bestimmung des Polierwertes
Essaispourdeterminerles caracteristiquesmecaniques et physiques des granulats-Partie 8:Determination du coefficient de polissage acceléré
This European Standard was approved by CEN on 24 February 2020.
CENmembers are bound to ply with the CEN/CENELECInternal Regulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical referencesconcerning such national standards maybe obtained on application to the CEN-CENELEC Management Centre or to any CENmember.
ThisEuropeanStandard exists in three official versions(English French German).Aversion in any otherlanguagemadebyCentre hasthe same status asthe official versions.
CENmembers arethenational standardsbodiesofAustria Belgium Bulgaria Croatia Cyprus CzechRepublic Denmark Estonia Finlananmany eugaylanlanlyaiiuaniauxmugltahlanyPoland Portugal RpublicfNorthMacedonia Romania Serbia Slovakia Slovenia pain weden witzerland TurkeyanUnited Kingdom.
CEN-CENELECManagementCentre:RuedelaScience23 B-1040Brussels
Contents
PageEuropeanforeword. 41 Scope.... 62 Normativereferences... ..6Terms and definitions.3 .64 Prini.....5 Materials75.1 General..5.2 Materials 76 Apparatus...6.1 General... ..86.2 Acceleratedpolishingmachine6.3 Frictiontester. 116.4 Test sieves... ..146.5 Grid ieve. .146.6 Length gauge or callipers.... .146.7 Equipmentforpreparingtestspecimens... .147 Preparation of testspecimens... 158 Conditioningoftherubber-tyredwheel. .16... 169 Acceleratedpolishingofspecimens....10 Friction test procedure.. ..1811 Calculation and expression of results ...2112 Testreport... 22Required. dat...12.1 2212.2 Optional data... ...22Annex A (normative) Determination of agregate abrasion value (Av).. ..23A.1 General. ..23A.2 Principle..... ..23A.3 Materi..s....23A.4 Apparatus... ...24A.4.1 General.. 24A.4.2 Abrasionmachine.... ..24A.4.3 Test sieves... .24A.4.4 Grid sieve... 24A.4.5 Balance.... .25Small fine-haired brushes .25A.4.6A.4.7 25A.4.8 Clam... .25A.5 Preparation of test specimens .... .25A.5.1 Test..ort.ion. ..25A.5.2 Specimens... 25A.6 Procedure... 25Calculation and expression of resultsA.7 ...26A.8 Testreport... ..26AnnexB(normative)Controlofmaterials-Cornemeryandemeryflour..AnnexC(normative)Calibrationofthe acceleratedpolishingmachine.... ..28C.1 Controlofrubber-tyredwheels.... 28
C.2 Acceleratedpolishingmachine...C.3 Rate of flowof corn emery and emeryflour.. ..30AnnexD(normative)Calibrationofthefrictiontesterandsliders .31D.1 Frictiontester... 31D.1.1General.... ..31D.1.2 Mass of pendulum arm and pointer... ..31D.1.3 Balancingofthependulum armassembly. .31D.1.4 Settingtheeffectivespringtension... ..31D.1.5 Setting t.he ointer s.to... ...31D.2 Control ofsliders andsliderrubber.... ..32Annex E(normative)Friction tester referencestonespecimen preparation and frictionsliderconditioning.... ...33E.1 General.... ..33Preparation and initial testing of friction tester reference stone specimens....3E.2E.3 Sliderconditioning.... ...33AnnexF(informative)Precision forthe aggregate abrasionvalue(AAv). ..34F.1 Gen.r....... ...34Precisionvaluesforrepeatability andreproducibility... ..34F.2Bibliora...
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.
bewithdrawnatthelatestbyOctober2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent 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 pared to the previous version are the following:
Clauses 5 and A.3 about sampling have been deleted as suficient information is given in the Scopeand in 8.1. Consequently all clauses have been renumbered.
- NewClause5Materialshasbeenrestructured.
Grading requirements for corn emery have been pleted (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 and5.2.4).
The feed mechanisms for corn emery and emery flour have been clarified (6.2.5 and 6.2.6).
Thefriction tester designhasbeen 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 intomain 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).
positioning of test specimens (Clause 10).
-The PsV control stone has been changed and the specified range adapted (11.2).1
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 been changed (C.1.3).
