ASTM_E_1364_-_95_2012.pdf

Designation:E136495(Reapproved 2012)Standard Test Method forMeasuring Road Roughness by Static Level Method1This standard is issued under the fixed designation E1364;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 test method covers the measurement of a longitu-dinal profile of a travelled surface using a static level for thepurpose of obtaining a road roughness index.This test methodis suitable for all surface types that are travelled by conven-tional ground vehicles,including paved and unpaved roads.1.2 This test method is labor-intensive with respect to othermeans for measuring longitudinal profile,and is used mainlyfor(1)validating other profile-measuring methods and(2)calibrating response-type roughness-measuring systems.NOTE1When measuring road roughness with a static level for thepurposes of validating other profile-measuring methods or calibratingresponse-type roughness-measuring systems,the static level measurementprocess should be evaluated to ensure the measurements are within theresolution required in Table 1.It is recommended that several locations bemarked at various distances from the level and these locations bemeasured in sequence several times to establish if the readings stay withinthe resolution required.Wind,distance between the rod and the level,surface texture,and positioning of the rod all have significant impact onthe repeatability of the elevation measurements.Any variation from thetrue elevations will primarily affect the bias as explained in 10.2.Todetermine the effect of random variations,random variations can be addedto an existing profile and the IRI recalculated to determine the impact ofthe variations.1.3 This test method describes the computation required forone particular type of roughness index,the vehicle simulationused in the International Roughness Index(IRI).Additionally,the profile obtained with this test method can be processed toobtain other roughness measures.1.4 This test method includes two levels of accuracy thatcan be chosen according to need.The more accurate,desig-nated as Class 1,reduces the measurement error of theroughness index to less than 2%of the true value of the index.The second,designated as Class 2,involves errors less than5%.1.5 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.1.6 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:E950 Test Method for Measuring the Longitudinal Profile ofTraveled Surfaces with an Accelerometer EstablishedInertial Profiling Reference2E1082 Test Method for Measurement of Vehicular Responseto Traveled Surface Roughness2E1170 Practices for Simulating Vehicular Response to Lon-gitudinal Profiles of Traveled Surfaces23.Summary of Test Method3.1 Measures of surface elevation are obtained at constantintervals along a line on a travelled surface to define alongitudinal profile.The line used for the profile is called awheeltrack,a path followed by the tire of a road vehicle.Themeasured numbers are recorded and entered into a computerfor graphical display and analysis.The profile points are usedas input to a computational algorithm that produces a summaryroughness index.3.2 This test method describes the use of conventionalsurvey equipment comprising an optical level and graduatedrod,but it may also be applied to automated techniques(forexample,laser-based systems)with appropriate adjustments.At a minimum,two persons are required;one to locate andhold the rod(the rod-man),and a second to read relativeheights through the leveling instrument and record the read-ings.For better efficiency,it is recommended that a thirdperson record the readings to allow the instrument operator toconcentrate on adjusting and reading the instrument.Whenmaximum measuring speed is desired,a fourth crew member isrecommended to act as relief.1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.31 onMethods for Measuring Profile and Roughness.Current edition approved June 1,2012.Published June 2012.Originallyapproved in 1990.Last previous edition approved in 2005 as E1364 95(2005).DOI:10.1520/E1364-95R12.2For 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 t