1、Designation:E266609(Reapproved 2014)Standard Practice forCorrelations of Mu Values of Continuous FrictionMeasurement Equipment to Determine Maintenance Levelsfor Use at Airports1This standard is issued under the fixed designation E2666;the number immediately following the designation indicates the y
2、ear 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 the method of calculating frictionalval
3、ues from correlations of continuous friction measurementequipment(CFME),using the Specification E1551 tire,for usein performing airport summer maintenance evaluations.1.2 The practice is intended to provide a unified frictionindex of levels for use in harmonizing the output of devices.1.3 Airport op
4、erators use a variety of CFMEs to assess thefriction levels of their paved runway surfaces.The measure-ments are used to determine when the surfaces should beconsidered for or subjected to maintenance.However,manyare built differently and produce different values when mea-suring the same pavement su
5、rfaces.This practice provides amethod to harmonize these measurements so that the frictionvalues generated can be used to determine the maintenancerequirements as established by the operating authority.1.4 The practice provides correlations for four maintenancelevels of friction:New Design/Construct
6、ion with grooves,NewDesign/Construction without grooves,Maintenance Planning,and Minimum Acceptable.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 ASTM International takes no position with respect tothe validity of any p
7、atent rights asserted in connection with anyitem mentioned in this standard.Users of this standard areexpressly advised that determination of the validity of any suchpatent rights,and the risk of infringement of such rights,areentirely their own responsibility.1.7 This standard does not purport to a
8、ddress 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:2E1551 Specifica
9、tion for Special Purpose,SmoothTreadTire,Operated on Fixed Braking Slip Continuous FrictionMeasuring EquipmentE1960 Practice for Calculating International Friction Indexof a Pavement SurfaceE2100 Practice for Calculating the International RunwayFriction Index2.2 Related Documents3FAA Advisory Circul
10、ar AC/150/5320-12 Measurement,Construction,and Maintenance of Skid Resistant AirportPavement SurfacesFriction Tester Manufacturers Instruction and ServicingManuals3.Terminology3.1 Definitions:3.1.1 brake force coeffcient(BFC),nfiltered mean of anumber of instantaneous friction readings divided by th
11、enormal force over a defined length.3.1.2 braking slip ratio,nratio of relative braking slipRPM to identical unbraked wheel RPM.An equivalent defini-tion is the ratio of the relative braking slip velocity to thehorizontal velocity of the wheel axle.3.1.3 continuous reading,fixed slip measuring equip
12、ment(CFME),nan apparatus that can be moved over the testsurface at the chosen test speed and that includes a test wheel,a system for retarding the test wheel and instrumentation formeasuring the resulting frictional force or the wheel torquebetween the test tire and test surface.1This practice is un
13、der the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.21 on FieldMethods for Measuring Tire Pavement Friction.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 2009.Last previous edition approved in
14、 2009 as E2666 09.DOI:10.1520/E2666-09R14.2For 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 Federal
15、Aviation Administration(FAA),800 IndependenceAve.,SW,Washington,DC 20591,http:/www.faa.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4 friction reading,nlongitudinal force divided bynormal load or torque on the test wheel genera
16、ted by longitu-dinal force divided by load times tire radius(moment arm).3.1.5 reporting length,ndefined length over which theBFC is calculated.3.1.6 standard test water film thickness,nwater flow ratedivided by the vehicle velocity times the width of application.3.2 Definitions of Terms Specific to This Standard:3.2.1 certifyingcalibration,nverificationoftestequipment,calibration equipment(separate or built-in),cali-bration procedures and equipment operation,recommended tobe performed once a ye
