ASTM_D_4125_-_D_4125M_-_21.pdf

Designation:D4125/D4125M21Standard Test Methods forAsphalt Content of Asphalt Mixtures by the Nuclear Method1This standard is issued under the fixed designation D4125/D4125M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the procedures for determin-ing the asphalt content of samples of uncompacted asphaltmixtures(Test Method A),and of laboratory compactedspecimens of asphalt mixtures(Test Method B)by examininga test sample with an apparatus that utilizes neutron thermal-ization techniques.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.3 A precision and bias statement for Method B in thisstandard has not been developed at this time.Therefore,Method B should not be used for acceptance or rejection of amaterial for purchasing purposes.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.See Section 6 and 8.4.2,8.5.6,and Note 4 for specific hazards.1.5 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:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD75/D75M Practice for Sampling AggregatesD140/D140M Practice for Sampling Asphalt MaterialsD979/D979M Practice for Sampling Bituminous PavingMixturesD1461 Test Method for Moisture or Volatile Distillates inAsphalt MixturesD1559 Test Method for Resistance to Plastic Flow of Bitu-minous Mixtures Using Marshall Apparatus(Withdrawn1998)3D1561/D1561M Practice for Preparation of BituminousMixture Test Specimens by Means of California KneadingCompactorD3387 Test Method for Compaction and Shear Properties ofBituminous Mixtures by Means of the U.S.Corps ofEngineers Gyratory Testing Machine(GTM)(Withdrawn2020)3D4013 Practice for Preparation of Test Specimens of Bitu-minous Mixtures by Means of Gyratory Shear Compactor(Withdrawn 2013)33.Significance and Use3.1 These test methods are useful as a rapid,nondestructivetechnique for determination of asphalt content of asphaltmixtures.3.2 These test methods are suitable for quality control andacceptance testing for construction and for research anddevelopment applications.The test method is used for deter-mination of asphalt content only as it does not provideextracted aggregate for gradation analysis.3.3 The nondestructive nature of the test allows repetitivemeasurements to be made on a single test sample for statisticalanalysis of test data.3.4 These test methods determine the asphalt content of atest sample by comparing the measured asphalt content withpreviously established calibration data.3.4.1 The asphalt content of a material expressed as apercentage is the ratio of the mass of asphalt in a given massof material to the total mass of the sample or to the mass of thesolid material particles.1These test methods are under the jurisdiction of ASTM Committee D04 onRoad and Paving Materials and are the direct responsibility of SubcommitteeD04.25 on Analysis of Asphalt Mixtures.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1983.Last previous edition approved in 2016 as D4125/D4125M 10(2016).DOI:10.1520/D4125_D4125M-21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.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.4.Interferences4.1 The fundamental assumptions inherent in this testmethod are that the material under test is homogeneous andthat h