ASTM_C_1067_-_12.pdf

Designation:C106712Standard Practice forConducting a Ruggedness Evaluation or Screening Programfor Test Methods for Construction Materials1This standard is issued under the fixed designation C1067;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 covers a procedure for evaluating theruggedness of a test method by determining the effects ofdifferent experimental factors on the variation of test results.The procedure is intended for use during the development of atest method before the interlaboratory study is executed,suchas those described in Practices C802 and E691.1.2 This practice covers,in general terms,techniques forplanning,collecting data,and analyzing results from a fewlaboratories.Appendix X1 provides the details of the proce-dure with an example and Appendix X2 provides additionalinformation on the methodology.1.3 The practice is not intended to give information perti-nent to estimating multilaboratory precision.1.4 The system of units for this practice is not specified.Dimensional quantities in the practice are presented only inillustrations of calculation methods.1.5 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: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 MaterialsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1169 Practice for Conducting Ruggedness Tests3.Terminology3.1 Definitions:3.1.1 For definitions of statistical terms used in thisstandard,refer to Terminology E456.3.2 Definitions of Terms Specific to This Standard:3.2.1 determination,nnumerical value of a characteristicof a test specimen measured in accordance with the given thetest method.3.2.2 effect,nof a factor,the difference in the measuredcharacteristics at each level of a factor averaged over all levelsof other factors in the experiment.3.2.3 factor,na condition or element in the test procedureor laboratory environment that can be controlled and that is apotential source of variation of determinations.3.2.4 level,nthe value or setting of a factor associatedwith a determination.3.2.5 replication,nthe act of obtaining,under specifiedconditions,two or more determinations on identical specimens.3.2.5.1 DiscussionReplicate determinations are typicallyrequired to be obtained by the same operator,using the sameapparatus,on specimens that are similar as possible,and duringa short time interval.3.2.6 ruggedness,nthe characteristic of a test methodsuch that determinations are not influenced to a statisticallysignificant degree by small changes in the testing procedure orenvironment.3.2.6.1 DiscussionStatistical significance is evaluated bycomparing the observed variation due to a factor to theexpected variation due to chance alone.3.2.7 screening,na planned experiment using a low num-ber of determinations to detect among many factors those thathave a significant effect on variation of determinations com-pared with chance variation.3.2.7.1 DiscussionIn this practice,the influence of sevenfactorsisevaluatedusingareplicatedsetofeightdeterminations,that is,a total of 16 determinations.1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates and is the direct responsibility of Subcommittee C09.94on Evaluation of Data(Joint C09 and C01).Current edition approved July 1,2012.Published September 2012.Originallyapproved in 1987.Last previous edition approved in 2007 as C1067 00(2007).DOI:10.1520/C1067-12.2For 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.Summary of Practice4.1 The practice requires that the user develop,from theo-retical or practical knowledge,or both,a list of factors thatplausibly would cause significant variation in test results(determinations)if the factors were not controlled.The tech-nique is limited to the analysis of the effects of seven factorsand requires16of the determinations that would be required toevaluate seven factors i