ASTM_D_6607_-_21.pdf

Designation:D660721Standard Practice forInclusion of Precision Statement Variation in SpecificationLimits1This standard is issued under the fixed designation D6607;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 practice covers a method of determining rationalspecification limits by inclusion of the precision of the testmethod used in the specification.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.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 MaterialsC802 Practice for Conducting an Interlaboratory Test Pro-gram to Determine the Precision of Test Methods forConstruction MaterialsD2172/D2172M Test Methods for Quantitative Extraction ofAsphalt Binder from Asphalt MixturesD2726/D2726M Test Method for Bulk Specific Gravity andDensity of Non-Absorptive Compacted Asphalt MixturesE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods2.2 Federal Highway Administration Report:3FHWAReportHI-93-047 MaterialsControlandAcceptanceQuality Assurance,FederalHighwayAdministration,May 19933.Terminology3.1 For definitions of terms used in this practice,consultPractice E177.4.Significance and Use4.1 Each test method has a limited precision.Even if a testis performed as carefully and as correctly as possible on amaterial which is as homogeneous as can be obtained,the testwill still vary from one to another.A widely used measure ofthe variation of the test results from a test method is thestandard deviation().In an ASTM standard test method,thestandard deviation of the test method can be found in thePrecision and Bias statement for the test.The“Blue Book,”Form and Style for ASTM Standards,requires that all testmethods include Precision and Bias statements.Practices C670and C802 provide guidance for determination of these values.4.2 If the precision of a test method is low and the precisionof the test has not been properly considered in a materialspecification,a uniform material with the right quality may stillbe rejected most of the time because of the wide variation ofthe test results.In order to have rational specification limits,theprecision of the test used should be properly included in aspecification.4.3 This practice provides a guideline for proper inclusionof precision of the test method in a rational specification.5.Procedure5.1 Determine the effective standard deviation(x)of thetest results due to the combined effects of materials variationand test variation using Eq 1:1This practice is under the jurisdiction of Committee D04 on Road and PavingMaterials and is the direct responsibility of Subcommittee D04.94 on StatisticalProcedures and Evaluation of Data.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 2000.Last previous edition approved in 2015 as D6607 00(2015).DOI:10.1520/D6607-21.2For 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.3Available from National Technical Information Service(NTIS),U.S.Depart-ment of Commerce,5285 Port Royal Rd.,Springfield,VA 22161.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.1x5=M21 T2!(1)where:M=standard deviation of test property due to materialvariation(seeNote 1),andT=standard deviation of test property due to test method(seeNote 2).NOTE1Mis the expected