ASTM_C_802_-_14.pdf

Designation:C80214Standard Practice forConducting an Interlaboratory Test Program to Determinethe Precision of Test Methods for Construction Materials1This standard is issued under the fixed designation C802;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.Scope*1.1 This practice describes techniques for planning,conducting,and analyzing the results of an interlaboratorystudy(ILS)with the objective of developing the precisionstatement of a test method.It is designed to be used inconjunction with Practice C670.The methods used in thisstandard are consistent with those in Practice E691.1.2 This practice is not intended for use in programs whosepurpose is to develop a test method or to assess the relativevariability of two or more test methods.Refer to PracticeC1067 for procedures to evaluate the ruggedness of a testmethod.1.3 The system of units for this practice has not beenspecified.Dimensional quantities in the practice are presentedonly in examples of calculations.1.4 This standard does not purport to address all safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC311/C311M Test Methods for Sampling and Testing FlyAsh or Natural Pozzolans for Use in Portland-CementConcreteC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1067 Practice for Conducting a Ruggedness Evaluation orScreening Program for Test Methods for ConstructionMaterialsE105 Practice for Probability Sampling of MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE178 Practice for Dealing With Outlying ObservationsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 For definitions of general statistical terms,refer toTerminology E456.3.1.2 For definitions of terms associated with precision oftest methods for construction materials,refer to Practice C670.4.Significance and Use4.1 This practice provides requirements for planning andconducting an interlaboratory study to obtain data to developsingle-operator and multilaboratory precision statements for atest method.It includes methods to evaluate data consistencybefore carrying out the calculations to develop the precisionstatement.The procedures are compatible with those in Prac-tice E691.4.2 The ILS data obtained from this practice are intendedfor developing the precision values for writing single-operatorand multilaboratory precision statements in accordance withPractice C670.4.3 Appendix X1 provides an example to illustrate thecalculations to obtain the precision values of the test methodfrom the ILS data.This may be used to check a user-developedelectronic spreadsheet for carrying out the calculations.4.4 Appendix X2 discusses the additional calculations re-quired for an interlaboratory study of a test method thatincludes making test specimens as part of the procedure.In thiscase,batch-to-batch variability needs to be considered.1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates.This practice was developed jointly byASTM CommitteeC01,C09,D04,and D18,and is endorsed by all four committees.Current edition approved Dec.15,2014.Published June 2015.Originallyapproved in 1974.Last previous edition approved in 2009 as C802 09A.DOI:10.1520/C0802-14.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.5 Appendix X3 discusses the use of analysis of varianceas an alternative approach to obtain the precision values fromthe ILS data.5.General Requirements5.1 Certain criteria need to be met before undertaking aninterlaboratory study to determine the precision of a testmethod.If some conditions are not met or are metincompletely,the program will become more complicated toadminister and require more work and expense,or may resultin impaired information.The requirements outlined in thissection are intended to ensure that the test method is free oftechnical difficulties to the greatest