ASTM C1067-2000(2007) Standard Practice for Conducting A Ruggedness or Screening Program for Test Methods for Construction Materials《建筑材料试验方法的耐久或屏蔽程序实施的标准实施规程》.pdf
《ASTM C1067-2000(2007) Standard Practice for Conducting A Ruggedness or Screening Program for Test Methods for Construction Materials《建筑材料试验方法的耐久或屏蔽程序实施的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1067-2000(2007) Standard Practice for Conducting A Ruggedness or Screening Program for Test Methods for Construction Materials《建筑材料试验方法的耐久或屏蔽程序实施的标准实施规程》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 1067 00 (Reapproved 2007)Standard Practice forConducting A Ruggedness or Screening Program for TestMethods for Construction Materials1This standard is issued under the fixed designation C 1067; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers a procedure for detecting sources ofvariation in a test me
3、thod.The procedure should be used duringthe development of a test method, before the interlaboratorystudy is executed, such as those in Practices C 670, C 802, andE 691. Interlaboratory studies can be expensive to execute.Resources will probably be more efficiently used if sources ofvariation in a t
4、est method are eliminated prior to performingthe interlaboratory study. The procedure also is useful fordetermining sources of variation in an existing test method thathas been found to have poor precision.1.2 This practice covers, in very general terms, techniquesfor planning, collecting data, and
5、analyzing results from a fewlaboratories. Annex A1 provides the details of the procedurewith an example and Annex A2 gives the theoretical back-ground.1.3 The practice does not give information pertinent toestimating within- or between-laboratory precision.1.4 This standard does not purport to addre
6、ss 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:2C 670 Practice
7、for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC 802 Practice for Conducting an Interlaboratory Test Pro-gram to Determine the Precision of Test Methods forConstruction MaterialsE 456 Terminology Relating to Quality and StatisticsE 691 Practice for Conducting a
8、n Interlaboratory Study toDetermine the Precision of a Test MethodE 1169 Guide for Conducting Ruggedness Tests3. Terminology3.1 Definitions:3.1.1 determination value, nnumerical quantity calculatedas directed in the test method using direct measurementsobtained in accordance with the procedures give
9、n in the testmethod.3.1.2 replication, nthe act of obtaining two or moredetermination values under specified conditions. The numberof replications must be finite and the scope of the replicationoperation may be narrow or broad, but must be specified.3.1.3 For definitions of other statistical terms u
10、sed in thisstandard, refer to Terminology E 456.3.2 Definitions of Terms Specific to This Standard:3.2.1 factor, nan element in the test procedure or labora-tory environment that is a potential source of variation in testresults.3.2.2 ruggedness, adjthe characteristic of a test methodthat produces t
11、est results that are not influenced by smalldifferences in the testing procedure or environment.3.2.3 screening, nthe detection of significant sources ofvariation as compared to chance variation.3.2.4 variable, na number or quantity that varies.4. Summary of Practice4.1 The practice requires that th
12、e user develop, from theo-retical or practical knowledge, or both, a list of factors thatplausibly would cause significant variation in test results if thefactors were not controlled. The technique is limited to theanalysis of the effects seven factors and requires considerablyless effort than would
13、 be required to collected data for seven1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates . This practice was developed jointly by ASTM Commit-tees C01, C09, D04, and D18, and is endorsed by all four committees.Current edition approved June 1, 2007. Pu
14、blished October 2007. Originallyapproved in 1987. Last previous edition approved in 2000 as C 1067 00.2For 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
15、Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.factors in a full factorial study. Procedures exist for analysis ofsmaller and larger numbers of factors (see Guide E 1169), butseven is a conve
16、nient number for many test methods forconstruction materials. The seven-factor analysis requires 16determinations by each laboratory. The procedure can beusefully executed by a single laboratory, but sometimes addi-tional information can be obtained if it is repeated in one or twoadditional laborato
17、ries.4.2 The procedure requires that two levels of each factor beidentified, then 16 determinations be done on a prescribedcombinations of factor levels. The levels assigned to a factormay be quantitative or qualitative (for example, brass versussteel).4.3 The disadvantage of this type of analysis i
18、s that themethod only estimates simple effects of each factor and doesnot detect interactive effects among factors.5. Significance and Use5.1 The purpose of a ruggedness evaluation is to determin-ing how sensitive the test method is to changes in levels ofpertinent operating factors. Normally, opera
19、ting conditions fora test method are defined along with an allowable tolerance. Aruggedness analysis determines that effect of worst-case varia-tion in operating conditions within this tolerance range. Themethod then can be revised with smaller tolerances on operat-ing conditions to improve the prec
20、ision.5.2 A major reason for poor precision in test methods is thelack of adequate control over the sources of variation in testingprocedures or testing environments. These sources of variationoften are not controlled adequately because they were notidentified during the development of the test proc
21、edures.5.3 All new test methods must be subjected to an interlabo-ratory program for purposes of developing a precision and biasstatement. These programs can be expensive and lengthy, andthe result may be that the determination is made that themethod is too variable to be published without further r
22、evision.Interlaboratory studies typically give the subcommittee anindication that the method is too variable, but they do notusually give a clear picture of what is causing the variation.Application of this ruggedness practice using one or a fewlaboratories may be a much more economical way to deter
23、minethese causes.5.4 Many existing test methods were published before therewas a requirement that precision and bias statements bedeveloped. Since this became a requirement, most of these testmethods have developed precision and bias statements, and theresult is that many have been found to suffer f
24、rom relativelylarge amount of variation. Use of this practice represents arelatively simple way to investigate the causes of variation intest methods, so that a subcommittee will have some guidanceas to which parts of the test method need to be studied furtherfor revision.5.5 The procedure can be us
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