ASTM C670-2015 Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials《建筑材料的试验方法配备精密度和偏差说明的标准实施规程》.pdf
《ASTM C670-2015 Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials《建筑材料的试验方法配备精密度和偏差说明的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C670-2015 Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials《建筑材料的试验方法配备精密度和偏差说明的标准实施规程》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C670 13C670 15Standard Practice forPreparing Precision and Bias Statements for Test Methodsfor Construction Materials1This standard is issued under the fixed designation C670; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 The Form and
3、Style for ASTM Standards requires that all test methods contain statements on precision and bias. Further,the precision statement is required to contain a statement on single-operator precision (repeatability) and a statement onmultilaboratory precision (reproducibility). This practice provides guid
4、ance for preparing precision and bias statements thatcomply with these requirements. Discussion of the purpose and significance of precision and bias statements for users of testmethods is also provided. Examples of precision statements that conform to this practice are included in Appendix X1. This
5、practice supplements Practice E177 and has been developed to meet the needs of ASTM Committees dealing with constructionmaterials.NOTE 1Although this practice is under the jurisdiction of Committee C09, the current version was developed jointly by Committees C01 and C09and has subsequently been adop
6、ted for use by other committees dealing with construction materials.1.2 This practice assumes that an interlaboratory study (ILS) has been completed in accordance with Practice C802 or PracticeE691. The interlaboratory study provides the necessary statistical values to write the precision and bias s
7、tatements.1.3 The system of units for this practice is not specified. Dimensional quantities in the practice are presented only in examplesof precision and bias statements.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibil
8、ityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C802 Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Method
9、s for ConstructionMaterialsC1067 Practice for Conducting a Ruggedness Evaluation or Screening Program for Test Methods for Construction MaterialsD6607 Practice for Inclusion of Precision Statement Variation in Specification LimitsE177 Practice for Use of the Terms Precision and Bias in ASTM Test Met
10、hodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. Terminology3.1 Definitions:3.1.1 For definitions of general statistical terms, refer to Terminology E456.3.2 Definitions of Terms Specific to Thi
11、s Standard:33.2.1 test determination, nthe value of a characteristic of a single test specimen obtained by a specified test method.1 This practice is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.94 onEvaluation
12、of Data (Joint C09 and C01).Current edition approved July 1, 2013June 15, 2015. Published July 2013August 2015. Originally approved in 1971. Last previous edition approved in 20102013 asC670C670 13.-10. DOI: 10.1520/C0670-13.10.1520/C0670-15.2 For referencedASTM standards, visit theASTM website, www
13、.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Terms are listed in order of hierarchy beginning with the basic concept.This document is not an ASTM standard and is
14、intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the c
15、urrent versionof the standard as published by ASTM is to be considered the official document.*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 States13.2.1.1 DiscussionThe term “
16、replicate“ is often used for a test determination.3.2.2 test result, nthe value of a characteristic of a material obtained by carrying out a specified test method.3.2.2.1 DiscussionA test result may be a single test determination or the average of a specified number of test determinations, or replic
17、ates (see 4.1for additional discussion).3.2.3 identical test specimens, ntest specimens selected at random and made from a single quantity or batch of material thatis as homogeneous as possible.3.2.3.1 DiscussionIn interlaboratory studies of test methods for fresh cementitious mixtures, a practicabl
18、e approach for obtaining identical testsspecimens is to assemble technicians from different laboratories at one location and test specimens are made from the same batchof the fresh mixture. For interlaboratory studies of nondestructive test methods, the same test specimens can be circulated amongpar
19、ticipating laboratories, provided the characteristic of interest does not change during the time to complete the study.3.2.4 single-operator standard deviation, sr, (or coeffcient of variation, CVr), nthe standard deviation (or coefficient ofvariation) of test determinations obtained on identical te
20、st specimens by a single operator using the same apparatus in the samelaboratory over a relatively short period of time.3.2.4.1 DiscussionThe single-operator standard deviation, or coefficient of variation, is the fundamental statistic underlying the single-operatorindexes of precision. The single-o
21、perator standard deviation, or coefficient of variation, is an indication of the variability of a largegroup of test determinations by the same operator on the same material. This value is obtained from an interlaboratory study andis equal to the pooled standard deviation of test determinations obta
22、ined by the operators. The coefficient of variation (ratio ofstandard deviation to the average expressed as a percentage) is used if the standard deviation is proportional to the level of thecharacteristic being measured. The single-operator standard deviation, usually considered a property of the t
23、est method, willgenerally be lower than the multilaboratory standard deviation. In Practice E177, the single-operator standard deviation is referredto as the repeatability standard deviation, and the subscript r is used. In previous versions of Practice C670, the terms one-sigmalimit (1s) or one sig
24、ma limit in percent (1s%) were used for the single-operator standard deviation or single-operator coefficientof variation, respectively. In some publications, the term within-test standard deviation (or coeffcient of variation) has been used.The term within-laboratory standard deviation (or coeffici
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