ASTM_D_3319_-_11.pdf

Designation:D331911Standard Practice for theAccelerated Polishing of Aggregates Using the BritishWheel1This standard is issued under the fixed designation D3319;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a laboratory procedure by which anestimate may be made of the extent to which different coarseaggregates may polish.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to SI units that are provided for informationonly and are not considered standard.Regarding sieves,perSpecification E11,“The values stated in SI units shall beconsidered standard for the dimensions of the wire clothopenings and the diameter of the wires used in the wire cloth.”When sieve mesh sizes are referenced,the alternate inch-pounddesignations are provided for information purposes and en-closed in parentheses.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C778 Specification for SandD75 Practice for Sampling AggregatesD1415 Test Method for Rubber PropertyInternationalHardnessD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsE303 Test Method for Measuring Surface Frictional Proper-ties Using the British Pendulum TesterE501 Specification for Rib Tire for Pavement Skid-Resistance Tests3.Terminology3.1 Definitions:3.1.1 initial friction value(PV-i)the initial British Pendu-lum Tester readings on the test specimens before they arepolished in the accelerated polishing machine.3.1.2 polish value(PV-n)a measure of the state of polishreached by a test specimen subjected to the specified hours(n)of accelerated polishing using the materials,equipment,andprocedures described in this method.The measurement is madeusing the British Pendulum Tester as described in 5.3 and TestMethod E303.3.1.3 residual polish value,(RPV-n)the residual polishvalue is obtained when a constant PV-n is achieved fourconsecutive times with repeated swings of the pendulum.4.Significance and Use4.1 This practice simulates the polishing action of vehiculartraffic on coarse aggregates used in bituminous pavements.4.2 A polish value is determined that may be used to rate orclassify coarse aggregates for their ability to resist polishingunder traffic.NOTE1The quality of the results produced by this standard aredependant upon the competence of the personnel performing the proce-dure and the capability,calibration,and the maintenance of the equipmentused.Agencies that meet the criteria of Standard Practice D3666 aregenerally considered capable of competent and objective testing/sam-pling/inspection/etc.Users of this standard are cautioned thatcompliance with D3666 alone does not completely assure reliable results.Reliable results depend on many factors:following the suggestions ofD3666 or similar acceptable guideline provides a means of evaluating andcontrolling some of those factors.5.Apparatus5.1 Accelerated Polishing Machine3An accelerated pol-ishing machine,also known as the British Wheel,and basedupon a 1958 design by the Road Research Laboratory of Great1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved June 1,2011.Published June 2010.Originallyapproved in 1974.Last previous edition approved in 2006 as D3319 06.DOI:10.1520/D3319-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Wessex Engineering and Metal Craft Co.,Ltd.,MerchantsBarton,Frome,Somerset,England.If you are aware of alternative suppliers,pleaseprovide this information to ASTM International Headquarters.Your comments willreceive careful consideration at a meeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Britain.This machine shall be mounted on a firm,rigid,andlevel base.The equipment shall include the following:5.1.1 Cylindrical WheelHereafter referred to as the roadwheel,and having a flat-surface periphery and of such size andshape as to permit 14 specimens described below to beclamped onto the periphery to form a continuous surface ofaggregate particles,134in.(4