ASTM C802-2014 Standard Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials《为测定建筑材料试验方法精确度而开展实验室间试验计划的标准实施.pdf
《ASTM C802-2014 Standard Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials《为测定建筑材料试验方法精确度而开展实验室间试验计划的标准实施.pdf》由会员分享,可在线阅读,更多相关《ASTM C802-2014 Standard Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials《为测定建筑材料试验方法精确度而开展实验室间试验计划的标准实施.pdf(24页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C802 14Standard 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 o
2、r, 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
3、 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 pro
4、grams 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 ar
5、e 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 regulatorylimitat
6、ions 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 Natur
7、al 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 Samplin
8、g 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. Terminology
9、3.1 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 andcondu
10、cting 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-
11、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
12、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 proc
13、edure. 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 a
14、pproved 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
15、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 States14.5 Appendix X3 discusses the use of
16、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
17、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 extent possible before anexpensive and time
18、-consuming interlaboratory study is under-taken.5.2 The first requirement is the existence of a valid andwell-written test method that has been developed in onelaboratory and has been subjected to ruggedness evaluation ofthe testing procedure and conditions as described in PracticeC1067. As a result
19、 of the screening procedure and someexperience with the test method in the sponsoring laboratoryand one or two others, a written version of the test method hasbeen developed (but not necessarily published as a standard)that describes the test procedure in terms that can be followedby a competent ope
20、rator in any properly equipped laboratory.Critical conditions that affect the test results need to beidentified and the proper and realistic degree of control of thoseconditions have to be specified in the description of the testprocedure.5.2.1 The tolerances established for various conditions in at
21、est method provide reasonable ranges for these conditions andrecognize that precise values with small tolerances may not beachievable in practice. Variations in test results due to varia-tions in such conditions contribute to the total variation, whichdetermines the precision of the test method. If
22、the resultingvariation is so great that uncertainties in average valuesobtained by the test method are unacceptably high, the testmethod itself is at fault and it will need to be improved orreplaced by a better one. An expensive and time-consuminginterlaboratory study is not recommended for such a t
23、estmethod.5.2.2 Apparatus required for performing the test must bedefined clearly and must be available or able to be produced. Ifalternative apparatus is permitted, criteria need to be providedon the performance requirements of the apparatus, such as byspecifying acceptable limits of measurements o
24、n standardreference materials.5.3 Personnel in laboratories participating in the ILS shouldhave adequate experience with routine laboratory proceduresso that they are competent to run the test. The importance ofthis requirement will vary with the complexity of the methodand the degree to which it de
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