ASTM_E_1890_-_11_2015.pdf

Designation:E189011(Reapproved 2015)Standard Guide forValidating New Area Reference Skid Measurement Systemsand Equipment1This standard is issued under the fixed designation E1890;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 guide covers validating area reference skid mea-surement systems(ARSMS)and related equipment.Thesesystems have been used since 1976 to evaluate and correlateTest Method E274 skid measurement systems used primarily asa pavement management tool by state Departments of Trans-portation.Also,this guide provides guidelines for the revali-dation process following the replacement of componentswithin an ARSMS.1.2 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 methodof validating a newARSMS to replace an existingARSMS thathas provided quality correlation data for a very long time.1.3 The values stated in inch-pound units are to be regardedas the standard since the ARSMS will be compared with statedepartments of transportation systems that all currently useinch-pound units.The values given in parentheses are math-ematical conversions to SI units that are provided for informa-tion only and are not considered standard.1.4 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:2E274 Test Method for Skid Resistance of Paved SurfacesUsing a Full-Scale TireE501 Specification for Rib 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 SystemsF377 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 Terminology used in this guide conforms to thedefinitions in Terminology E867.4.Summary of Guide4.1 There are three phases to the process of validating newARSMS equipment.Phase One is the calibration of all theequipment and instrumentation to be used in this process.Phase Two addresses the variables associated with the deter-mination of a skid number(SN)and attempts to quantify theimpact that each variable may have upon the accurate deter-mination of an SN.Phase Three is the dynamic validationprocess,based upon the variables confirmed in Phase Two.4.2 The approach is based upon Test Method E274 but withmuch narrower tolerances and greater control of the manypotential variables.The extra effort is required since theproducts are measurement tools which will be used to evaluatethe variety of Test Method E274 systems.4.3 It is anticipated that the SN data produced by the twoexisting ARSMS and the SN data produced by each of the newARSMS will have no significant difference.4.4 The following three-phase procedural guide identifiesthe individual components or pieces,the evaluation process foreach item,and the expected results.5.Significance and Use5.1 Friction characteristics of traveled surfaces are moni-tored by skid measurement systems,and the operating proce-dure for the use of these systems is Test Method E274.However,dynamic measurement differences between thesesystems,that comply with the requirements of Test Method1This 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 Sept.1,2015.Published December 2015.Originallyapproved in 1997.Last previous edition approved in 2011 as E1890-11.DOI:10.1520/E1890-11R15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E274,require that each of these systems be correlated to eachother system.The most effective approach to accomplish thiscorrelation is to compare each system to a singular,highlyaccurate system,or to a very limited number(two or three)ofsystems,in a controlled environment.The ARSMSs weredesigned to be such systems.Fig.1 depicts a skid measurementsystem and shows the general location of the major compo-nents.5.2 This guide defines the process of ensuring that theARS