ASTM_E_2793_-_10e1.pdf

Designation:E2793101Standard Guide for theEvaluation,Calibration,and Correlation of E274 FrictionMeasurement Systems and Equipment1This standard is issued under the fixed designation E2793;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.1NOTEEditorial corrections were made to this Guide in 20111.Scope1.1 This guide describes the evaluation,calibration,andcorrelation of Test Method E274 friction measurement systemsas conducted at a Field Test Center(FTC)2.The evaluation,calibration and correlation process;using the specializedequipment,facilities,surfaces,trained personnel,and AreaReference Friction Measurement Systems(ARFMS)availableat each FTC;are conducted using the procedures describedbelow.1.2 The FTC complies with the requirements of GuideE1890.Guide E1890 requires a more stringent calibrationprocess and requires all ARFMS system be correlated togetheronce a year on three surfaces at three speeds with twelverepeats each for a total of 108 pairs.1.3 This guide is offered as a process to identify andquantify the variables that affect system performance,tominimize the effect of these variables,and to provide a meansto relate Test Method E274 friction measurement systems toreference skid measurement systems.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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:3E274 Test Method for Skid Resistance of Paved SurfacesUsing a Full-Scale TireE501 Specification for Rib Tire for Pavement Skid-Resistance TestsE524 Specification for Smooth Tire for Pavement Skid-Resistance TestsE556 Test Method for Calibrating a Wheel Force or TorqueTransducer Using a Calibration Platform(User Level)E867 Terminology Relating to Vehicle-Pavement SystemsE1890 Guide for Validating New Area Reference Skid Mea-surement Systems and EquipmentF377 Practice for Calibration of Braking/Tractive MeasuringDevices for Testing TiresF457 Test Method for Speed and Distance Calibration ofFifth Wheel Equipped With Either Analog or DigitalInstrumentation3.Terminology3.1 Definitions:3.1.1 AreaReferenceFrictionMeasurementSystem(ARFMS),na Test Method E274 type measurement systemthat meets the requirements of Guide E1890.3.1.2 Calibration Platform,na frictionless moving plat-form for applying a tractive force in the contact plane of a tire,and associated means for measuring the applied horizontal andvertical force.Also referred to as a“force plate.”3.1.3 Field Test Center(FTC),na facility with the neededtest equipment,Area Reference Friction Measurement System,test pavements and expertise to evaluate,calibrate and corre-late Test Method E274 skid measurement systems.3.2 Other terminology used in this guide conforms to thedefinitions in Terminology E8671This guide is under 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.1,2010.Published June 2011.Originallypublished 2010.Last previous version approved 2010 as E279310.DOI:10.1520/E279310e012Currently,one FTC is located at Texas Transportation Institute(TTI)nearCollege Station,Texas.A similar Center is located among the facilities of theTransportation Research Center Inc.(TRC)in East Liberty,Ohio3For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Guide4.1 There are three phases to this guide.Phase one recordsand reports the static and dynamic condition and accuracy ofthe visiting system in an“as arrived”condition with nochanges being made.During phase two,each subsystem isevaluated and if necessary,adjusted to insure compliance withtolerances outlined in Test Method E274.Phase three is thefinal dynamic correlation between the visiting system and theARFMS.4.2 An additional service of the FTC will be to calibrate thecalibration platform or force plate used by the visiting agency.4.3 A detailed report will be generated and presented to thevisiting agency describing all static and dynamic test results.5.Significance and Use5.1 Friction character