EN 1097-8:2009

Foreword
1 Scope
2 Normative references
3 Definitions
4 Principle
5 Sampling
6 Materials
7 Apparatus
   7.1 General
   7.2 Accelerated polishing machine
   7.3 Friction tester
   7.4 Test sieves
   7.5 Grid sieve
   7.6 Length gauge or callipers
   7.7 Equipment for preparing test specimens
8 Preparation of test specimens
9 Conditioning of the rubber-tyred wheel
10 Accelerated polishing of specimens
11 Friction test procedure
12 Calculation and expression of results
13 Test report
Annex A (normative) - Determination of aggregate
                      abrasion value (AAV)
   A.1 General
   A.2 Principle
   A.3 Sampling
   A.4 Materials
   A.5 Apparatus
   A.6 Preparation of test specimens
   A.7 Procedure
   A.8 Calculation and expression of results
   A.9 Test report
Annex B (normative) - Control of materials
Annex C (normative) - Calibration of the accelerated
                      polishing machine
   C.1 Control of rubber-tyred wheels
   C.2 Accelerated polishing machine
   C.3 Rate of flow of corn emery and emery flour
Annex D (normative) - Calibration of the friction tester
                      and sliders
   D.1 Friction tester
   D.2 Control of sliders and slider rubber
Annex E (informative) - Precision
   E.1 General
   E.2 PSV value - National Standard
   E.3 PSV value - European cross-border testing
   E.4 Aggregate abrasion value (AAV)
Bibliography

This Standard describes the reference method used for type testing and in cases of dispute fordetermining the polished stone value (PSV) of a coarse aggregate used in road surfacings. For otherpurposes, in particular factory production control, other methods may be used provided that anappropriate working relationship with the reference method has been established.Annex A describes an optional method for the determination of the aggregate abrasion value (AAV).NOTE The AAV method should be used when particular types of skid resistant aggregates (typically those witha PSV of 60 or greater) which can be susceptible to abrasion under traffic, are required.