EN 1097-8:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.ORþHYDQMHPrüfverfahren für mechanische und physikalische Eigenschaften von Gesteinskörnungen - Teil 8: Bestimmung des PolierwertesEssais pour déterminer les caractéristiques mécaniques et physiques des granulats - Partie 8: Détermination du coefficient de polissage accéléréTests for mechanical and physical properties of aggregates - Part 8: Determination of the polished stone value91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:Ta slovenski standard je istoveten z:EN 1097-8:2009SIST EN 1097-8:2009en,de01-oktober-2009SIST EN 1097-8:2009SLOVENSKI
STANDARDSIST EN 1097-8:20001DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1097-8July 2009ICS 91.100.15Supersedes EN 1097-8:1999
English VersionTests for mechanical and physical properties of aggregates -Part 8: Determination of the polished stone valueEssais pour déterminer les caractéristiques mécaniques etphysiques des granulats - Partie 8: Détermination ducoefficient de polissage accéléréPrüfverfahren für mechanische und physikalischeEigenschaften von Gesteinskörnungen - Teil 8:Bestimmung des PolierwertesThis European Standard was approved by CEN on 12 June 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1097-8:2009: ESIST EN 1097-8:2009

Determination of aggregate abrasion value (AAV) . 19 A.1 General . 19 A.2 Principle . 19 A.3 Sampling . 19 A.4 Materials . 19 A.5 Apparatus . 20 A.6 Preparation of test specimens . 21 A.7 Procedure . 21 A.8 Calculation and expression of results . 22 A.9 Test report . 22 Annex B (normative)
Control of materials . 24 Annex C (normative)
Calibration of the accelerated polishing machine . 25 C.1 Control of rubber-tyred wheels . 25 C.2 Accelerated polishing machine . 25 C.3 Rate of flow of corn emery and emery flour . 25 Annex D (normative)
Calibration of the friction tester and sliders . 27 D.1 Friction tester . 27 D.2 Control of sliders and slider rubber . 28 Annex E (informative)
Precision . 29 E.1 General . 29 E.2 PSV value - National Standard . 29 E.3 PSV value - European cross-border testing . 29 SIST EN 1097-8:2009

Determination of the resistance to wear (micro-Deval)  Part 2:
Methods for the determination of resistance to fragmentation  Part 3:
Determination of loose bulk density and voids  Part 4:
Determination of the voids of dry compacted filler  Part 5:
Determination of water content by drying in a ventilated oven  Part 6:
Determination of particle density and water absorption  Part 7:
Determination of the particle density of filler — Pyknometer method  Part 9:
Determination of the resistance to wear by abrasion from studded tyres: Nordic test  Part 10:
Determination of water suction height According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 1097-8:2009

3 Definitions For the purposes of this document the following definitions apply. 3.1 test specimen sample used in a single determination when a test method requires more than one determination of a property 3.2 batch production quantity, a delivery quantity, a partial delivery quantity (railway wagon-load, lorry-load, ship's cargo) or a stockpile produced at one time under conditions that are presumed uniform NOTE With a continuous process the quantity produced during an agreed period is treated as a batch. SIST EN 1097-8:2009

The test is carried out on aggregate passing a 10 mm sieve and retained on a 7,2 mm grid sieve, and is in two parts: a) test specimens are subjected to a polishing action in an accelerated polishing machine; b) the state of polish reached by each specimen is measured by means of a friction test. The PSV is then calculated from the friction determinations. 5 Sampling The sample submitted to the laboratory for the test shall be obtained from a batch of normal production from the source. Aggregate that has been freshly produced in the laboratory or has been recovered from bituminous mixtures can give misleading results and shall not be used for conformity testing. 6 Materials 6.1 General, Detailed requirements for the control of materials are specified in Annex B. 6.2 Natural corn emery, complying with the grading specified in Table 1. This shall be used only once. Table 1 — Grading requirements for corn emery Nominal width of sieve aperture Total passing mm % 0,600 98 to 100 0,500 70 to 100 0,425 30 to 90 0,355 0 to 30 0,300 0 to 5
6.4 PSV control stone, from a recognized source, with a mean PSV value in the range 50 to 60. NOTE 1 At present the only recognized source of PSV control stone is a stock of quartz dolerite aggregate controlled by Transport Research Laboratory (TRL), Old Wokingham Road, Crowthorne, Berkshire RG11 6AU, United Kingdom.
NOTE 2 An alternative source of PSV control stone with a mean PSV value in the range 50 to 60 can be used provided the PSV value has been established in a controlled experiment carried out in at least 10 laboratories, by cross testing against the TRL type control stone. In case of dispute, the TRL type control stone should be used. 6.5 Friction tester reference stone, from a recognized source, for conditioning new sliders and checking the friction tester (11.3), with a mean PSV value in the range 60 to 65. NOTE 1 At present the only recognized source of friction tester reference stone is a stock of olivine basalt aggregate controlled by the Transport Research Laboratory (TRL), Old Wokingham Road, Crowthorne, Berkshire RG11 6AU, United Kingdom. NOTE 2 An alternative source of friction tester reference stone with a mean PSV value in the range 60 to 65 can be used provided the PSV value has been established in a controlled experiment carried out in at least 10 laboratories, by cross testing against the TRL type friction tester reference stone. In case of dispute, the TRL type friction tester reference stone should be used. 7 Apparatus 7.1 General All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5. Additional requirements for calibration and control of the accelerated polishing machine and the rubber-tyred wheels are given in Annex C. SIST EN 1097-8:2009

Key : 1
Road wheel 2
Solid rubber-tyred wheel 3
Weight 4
Feed mechanisms 5
Water feed 6
Flow gauge Figure 1 — Typical accelerated polishing machine SIST EN 1097-8:2009

Figure 2 — Test specimen dimensions 7.3 Friction tester 7.3.1 Calibration Additional requirements for calibration and control of the friction tester, sliders and slider rubber are given in Annex D. 7.3.2 Design The friction test shall be carried out using the equipment shown in Figure 3 (see Note). All bearings and working parts shall be enclosed as far as possible, and all materials used shall be treated to prevent corrosion under wet conditions. NOTE The equipment shown in Figure 3 is manufactured to the design of the Transport Research Laboratory (TRL), Old Wokingham Road, Crowthorne, Berkshire RG11 6AU, United Kingdom. The friction test equipment shall have the following features: 7.3.2.1 A spring-loaded rubber slider of the mass, size and shape as specified in 7.3.2.9. It shall be mounted on the end of a pendulum arm so that the sliding edge is approximately 510 mm from the axis of suspension (11.6). 7.3.2.2 Means for setting the support column of the equipment vertical. 7.3.2.3 Means for rigidly locating one of the curved specimens from the accelerated polishing machine so that its longer dimension lies in the track of the pendulum and it is central with respect to the rubber slider and to the axis of suspension of the pendulum. SIST EN 1097-8:2009

Key 1
F - scale 2
Calibration scale 3
Pointer 4
Vertical adjustment screw 5
Pendulum 6
Spirit level 7
Rubber slider 8
Levelling screw 9
Test specimen holder Figure 3 — Friction tester 7.3.2.4 Means of raising and lowering the axis of suspension of the pendulum arm so that the slider can: a) swing clear of the surface of the specimen; and b) be set to traverse a curved specimen over a length of (76 ± 1) mm. 7.3.2.5 Means of holding and releasing the pendulum arm so that it falls freely from a horizontal position. 7.3.2.6 A pointer balanced about the axis of suspension, indicating the position of the pendulum arm throughout its forward swing and moving over the circular scale. The mass of the pointer shall be SIST EN 1097-8:2009

Key : 1
Pendulum 2
Slider 3
Test specimen 4
Angle, (26 ± 3)º Figure 4 — Position of the pendulum, the slider and the test specimen 7.3.2.10 The slider shall be spring-loaded against the test surface. The nominal static force on the slider as set by the equipment calibration procedure defined in Annex D shall be (22,2 ± 0,5) N in its median position. The change in the static force on the slider shall be not greater than 0,2 N/mm deflection of the slider. 7.3.2.11 The initial resilience and hardness of the slider shall conform to Table 3. The working edges of the slider shall be square and clean-cut, and the rubber free from contamination by, for example, abrasive or oil. SIST EN 1097-8:2009

Lüpke rebound test in accordance with ISO 4662. b
International rubber hardness in accordance with ISO 48. 7.4 Test sieves Sieves with square apertures and sizes 10 mm; 0,600 mm; 0,500 mm; 0,425 mm; 0,355 mm;
0, 300 mm and 0,050 mm. 7.5 Grid sieve Sieve with a bar spacing of (7,2 ± 0,1) mm and conforming to the general requirements of EN 933-3. NOTE A flake sorting sieve with a slot width of (7,2 ± 0,1) mm and a slot length of (40 ± 1) mm can be used. 7.6 Length gauge or callipers Length gauge or callipers having a gap between the pins or faces of (14,7 ± 0,2) mm. 7.7 Equipment for preparing test specimens Equipment for preparing test specimens shall consist of the following: a) release agent such as liquid car polish; b) liquid cleaner, for cleaning the equipment after use; c) synthetic resin and hardener; d) container for mixing resin and hardener; e) flexible plastics sheet of a material such as polyvinyl acetate; f) accurately machined moulds for preparing specimens of the dimensions shown in Figure 2; g) rigid covers having one plane face, and the other shaped to the radius of curvature (189,0 ± 0,50) mm of the polishing test mould and slightly larger than the mould; h) a means of holding the cover onto the resin backing such as G-clamps or weights; i) two fine-haired brushes of about 3 mm diameter; j) a stiff bristle brush; k) a spatula; l) dry fine aggregate (sand), all passing the 0,300 mm sieve. NOTE Filler can be added to the resin to make it less fluid. The resin can also be added to the mould in two layers. SIST EN 1097-8:2009

Place them as closely as possible to each other and cover as much of the bottom of the mould as is possible.
Then fill the interstices between the particles to approximately three-quarters of their depth with fine aggregate (sand). Level off with a fine-haired brush or by gentle blowing. Care shall be taken not to disturb the aggregate particles. 8.6 Mix the hardener with the resin in the container in accordance with the manufacturer's instructions. Fill the mould to overflowing with the mixed resin and float off the surplus with the spatula without disturbing the main body of the resin. NOTE As an alternative to floating-off, the surplus can be squeezed out by covering the mould with a plastic sheet and pressing the metal cover onto the sheet. 8.7 When the resin begins to harden (normally after 5 min to 10 min), trim any excess resin from the edges of the mould with a knife. Press the metal cover to the back of the specimen by means of a clamp or weights to prevent distortion during setting. Remove the specimen from the mould after the resin has set and cooled (normally about 30 min after mixing). Remove the loose fine aggregate (sand) with the stiff bristle brush. After the resin has completely set and cooled, wait a further 30 min before polishing the specimen in accordance with Clause 10. Clean the moulds and tools as required. 8.8 Check that each finished specimen presents the natural surface of the aggregate particles to the rubber-tyred wheel, with no sharp projecting edges, and is not less than 12,5 mm thick. Reject any specimen with resin exposed at the surface or with disturbed particles. NOTE The exposed surfaces of the specimens should stand proud of the backing resin. SIST EN 1097-8:2009
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