ASTM_E_3209_-_19.pdf

Designation:E320919Standard Test Method forPavement Thickness by Magnetic Pulse Induction1This standard is issued under the fixed designation E3209;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 equipment,field procedures,and interpretation of the results for the pavement thicknessmeasurements produced by a magnetic pulse induction(MPI)device.Magnetic pulse induction devices induce a weak-pulsed magnetic field that causes the induction of eddy currentsin metal objects disturbing the field.In order to measurepavement thickness with an MPI device,a pre-placed metalreflector is required.When the metal reflector enters into thefield,an electrical signal is produced and processed throughalgorithms to detect and produce quantitative values forpavement thickness.1.2 This test method also provides the details includingconfiguration and metallurgy required to purchase and installreflectors to produce accurate and repeatable results.1.3 This method is intended for use with plain-jointedconcrete pavements,asphalt pavements,base courses withcement binders,and unbound aggregate layers.It is notapplicable for continuously reinforced,mesh-reinforced,orfiber-reinforced pavement where the metal reinforcementwould interfere with the magnetic field.1.4 MPI equipment includes a device that induces themagnetic field and collects the electrical signal.The signalinformation is collected and processed into pavement thick-nesses through algorithms programmed into the device firm-ware.1.5 MPI field procedures describe the steps and processesrequired to collect reliable,repeatable,and accurate resultsfrom the MPI device.Critical to the accuracy are the metal-lurgy and configuration of the metal reflectors pre-placed priorto installation of the asphalt or concrete pavement.Also,theabsence of any metallic object near the reflector is required toavoid influencing the test result.1.6 MPI results require little interpretation when the correctreflector calibration is selected and used during the field test.1.7 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.1.8 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A653/A653M Specification for Steel Sheet,Zinc-Coated(Galvanized)or Zinc-Iron Alloy-Coated(Galvannealed)by the Hot-Dip ProcessB209 Specification for Aluminum and Aluminum-AlloySheet and PlateC174/C174M Test Method for Measuring Thickness of Con-crete Elements Using Drilled Concrete CoresC802 Practice for Conducting an Interlaboratory Test Pro-gram to Determine the Precision of Test Methods forConstruction Materials2.2 AASHTO Standards:3T 148 Standard Method of Test for Measuring Length ofDrilled Concrete CoresT 359-16 Standard Method of Test for Pavement Thicknessby Magnetic Pulse Induction1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.41 onPavement Testing and Evaluation.Current edition approved May 1,2019.Published May 2019.Originallyapproved in 2019.DOI:10.1520/E3209-19.2For 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 American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.Terminology3.1 De