1、BS EN1097-8:2009ICS 91.100.15NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTests for mechanicaland physicalproperties ofaggregatesPart 8: Determination of the polishedstone valueThis British Standardwas published under theauthority of the StandardsPolicy and S
2、trategyCommittee on 31 August2009 BSI 2009ISBN 978 0 580 63832 9Amendments/corrigenda issued since publicationDate CommentsBS EN 1097-8:2009National forewordThis British Standard is the UK implementation of EN 1097-8:2009. Itsupersedes BS EN 1097-8:2000 which is withdrawn.The UK participation in its
3、 preparation was entrusted to TechnicalCommittee B/502/6, Test methods.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct applic
4、ation.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 1097-8:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1097-8July 2009ICS 91.100.15 Supersedes EN 1097-8:1999 English VersionTests for mechanical and physical properties of aggregates -Part 8: Determina
5、tion of the polished stone valueEssais pour dterminer les caractristiques mcaniques etphysiques des granulats - Partie 8: Dtermination ducoefficient de polissage acclrPrfverfahren fr mechanische und physikalischeEigenschaften von Gesteinskrnungen - Teil 8:Bestimmung des PolierwertesThis European Sta
6、ndard 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 suc
7、h 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 a
8、nd 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
9、, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of expl
10、oitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1097-8:2009: EBS EN 1097-8:2009EN 1097-8:2009 (E) 2 Contents Page Foreword . 4 1 Scope 5 2 Normative references . 5 3 Definitions 5 4 Principle . 6 5 Sampling 6 6 Materials . 6 7 Apparatus 7 7.1 General . 7
11、7.2 Accelerated polishing machine . 8 7.3 Friction tester 10 7.4 Test sieves . 13 7.5 Grid sieve . 13 7.6 Length gauge or callipers 13 7.7 Equipment for preparing test specimens . 13 8 Preparation of test specimens . 14 9 Conditioning of the rubber-tyred wheel 15 10 Accelerated polishing of specimen
12、s . 15 11 Friction test procedure . 16 12 Calculation and expression of results 18 13 Test report . 18 Annex A (normative) 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 .
13、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
14、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-bo
15、rder testing . 29 BS EN 1097-8:2009EN 1097-8:2009 (E) 3 E.4 Aggregate abrasion value (AAV) . 30 Bibliography . 31 BS EN 1097-8:2009EN 1097-8:2009 (E) 4 Foreword This document (EN 1097-8:2009) has been prepared by Technical Committee CEN/TC 154 “Aggregates”, the secretariat of which is held by BSI. T
16、his 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 January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010. Attention is drawn to the possibility that some of
17、 the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1097-8:1999. This standard forms part of a series of tests for mechanical and physical properties of aggrega
18、tes. Test methods for other properties of aggregates are covered by Parts of the following European Standards: EN 932, Tests for general properties of aggregates EN 933, Tests for geometrical properties of aggregates EN 1367, Tests for thermal and weathering properties of aggregates EN 1744, Tests f
19、or chemical properties of aggregates EN 13179, Tests for filler aggregate used in bituminous mixtures The other parts of EN 1097 are: Part 1: Determination of the resistance to wear (micro-Deval) Part 2: Methods for the determination of resistance to fragmentation Part 3: Determination of loose bulk
20、 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: Determi
21、nation 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, Belgi
22、um, 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. BS EN 1097-8:2009EN
23、 1097-8:2009 (E) 5 1 Scope This Standard describes the reference method used for type testing and in cases of dispute for determining the polished stone value (PSV) of a coarse aggregate used in road surfacings. For other purposes, in particular factory production control, other methods may be used
24、provided that an appropriate 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 w
25、ith a PSV of 60 or greater) which can be susceptible to abrasion under traffic, are required. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edi
26、tion of the referenced document (including any amendments) applies. EN 932-2, Tests for general properties of aggregates Part 2: Methods for reducing laboratory samples EN 932-5, Tests for general properties of aggregates Part 5: Common equipment and calibration EN 932-6, Tests for general propertie
27、s of aggregates Part 6: Definitions of repeatability and reproducibility EN 933-3, Tests for geometrical properties of aggregates Part 3: Determination of particle shape Flakiness index EN 1097-6, Tests for mechanical and physical properties of aggregates Part 6: Determination of particle density an
28、d water absorption ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 4662, Rubber Determination of rebound resilience of vulcanizates ISO 7619 (all parts), Rubber, vulcanized thermoplastic Determination of indentation hardness 3 Definit
29、ions 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, l
30、orry-load, ships 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. BS EN 1097-8:2009EN 1097-8:2009 (E) 6 3.3 laboratory sample reduced sample derived from a bulk sa
31、mple for laboratory testing 3.4 subsample sample obtained by means of a sample reduction procedure 3.5 test portion sample used as a whole in a single test 4 Principle PSV is a measure of the resistance of coarse aggregate to the polishing action of vehicle tyres under conditions similar to those oc
32、curring on the surface of a road. 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 measure
33、d 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 recov
34、ered 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 on
35、ly 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 300,300 to 5 BS EN 1097-8:2009EN 1097-8:2009 (E) 7 6.3 Air-floated or water-washed natural emery flour, all of which passes a 0,050 mm test
36、 sieve. This shall be used only once. NOTE Corundum emery flour with the following characteristics has been found to be suitable: a) at least 50 % Al2O3content; b) particle density of at least 3,5 Mg/m3; c) particle size distribution (by air jet sieving) as given in Table 2. Table 2 Particle size di
37、stribution (by air jet sieving) Sieve size Passing mm %0,050 99 to 100 0,032 75 to 98 0,020 60 to 80 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
38、 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 car
39、ried 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 P
40、SV 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 sour
41、ce 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
42、 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 gi
43、ven in Annex C. BS EN 1097-8:2009EN 1097-8:2009 (E) 8 7.2 Accelerated polishing machine The polishing machine, (see Figure 1), shall be mounted on four adjustable levelling feet, placed at the corners and secured on a firm, level base of stone or concrete. It shall include the following: 7.2.1 A whe
44、el, referred to as the “road wheel“, having a flat periphery and clamping arrangements to hold the aggregate specimens shown in Figure 2. It shall be of such a size and shape as to permit 14 of the specimens described in Clause 8 to be clamped onto the periphery so as to form a surface of aggregate
45、particles (406 3) mm in diameter and bounded by clamping rings (44,5 0,5) mm apart. 7.2.2 A means of rotating the road wheel about its own axis at a speed of (320 5) min-1under test conditions. 7.2.3 Two solid rubber-tyred wheels of (200 3) mm diameter and with a width of (38 2) mm. These rubber-tyr
46、ed wheels shall be of two different colours. A dark coloured (coarse) wheel shall be used with the corn emery and a light coloured (fine) wheel shall be used with the emery flour. The rubber tyres shall initially have a hardness of (69 3) IRHD as specified in ISO 7619. NOTE Both rubber-tyred wheels
47、can be of the same colour provided each is clearly marked as being “coarse“ or “fine“ as appropriate. 7.2.4 A lever arm and weight to bring the surface of the appropriate solid rubber-tyred wheel to bear on the road wheel with a total free force of (725 10) N. The solid rubber-tyred wheel shall be f
48、ree to rotate about its own axis, which shall be parallel with the axis of the road wheel, and the plane of rotation of the tyre shall be in line with that of the road wheel. The machine shall be accurately aligned so that the road wheel and either of the rubber-tyred wheels shall be free to rotate
49、without play in the bearings: a) the planes of rotation of the two wheels in use shall be not more than 0,33 of arc out of parallel (1 mm in 200 mm); b) the planes of rotation through the centres of the two wheels in use shall be not more than 0,8 mm apart. 7.2.5 Feed mechanism, identified as being for use with the dark coloured (coarse) rubber-tyred wheel to feed the corn emery and water at the specified rates. The emery and water shall be fed directly onto the road wheel near the point of contact with
