1、STD-BSI BS EN 732-b-ENGL 1999 .I 1bZllbb7 0797105 371 BRITISH STANDARD Tests for general properties of aggregates - Part 6: Definitions of repeatability and reproducibility The European Standard EN 93261999 has the status of a British Standard ICs 91.100.15 NO COPYING WITHOUT BSI PERMISSION EXCEPT A
2、S PERMITTED BY COPYRIGH LAW BS EN 932-6: 1999 BS EN 932-6:1999 been prepared under the Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 September 1999 direction of the Sector Amd. No. O BSI 09-1999 National forewor
3、d Date Comments This British Standard is the English language version of EN 93261999. It is included in a package of European Standards declared by CENAC 154 and wil supersede BS 812-101:1984, which Wiu be withdram on 2001201. The UK participation in its preparation was entrusted by Technical Commit
4、tee B/502, Aggregates, to Subcommittee B/502/6, Test methods, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or prop
5、osals for change, and keep the UK interests informed them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be
6、found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a c0nlmc.t Users of British Standa
7、rds are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 11 and a back cover. The BSI copyright notice
8、displayed in this document indicates when the document was last issued. ISBN O 580 32539 3 STDOBSI BS EN 932-b-ENGL 1999 E LbiYbbS 0797107 1YY EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN932-6 May 1999 ICs 01.040.91; 91.100.20 English version Tests for general properties of aggregates - Part
9、 6: Definitions of repeatability and reproducibility Essais pour dterminer les proprits gnrales des granulats - Gesteinskrnungen - Partie 6: Dfinitions de la rptabilit et de la reproductibilit Vergleichprzision Prfverfahren fur allgemeine Eigenschaften von Teil 6: Definitionen von Wiederholprzision
10、und This European Standard was approved by CEN on 16 April 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-todate lists and bibliographical re
11、ferences concerning such national stanards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member
12、into its own language and notified to the Central secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal
13、, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart, 36 B-1050 Brussels O 1999 CEN All rights of exploitation in any form and by any means reserved worldwide fo
14、r CEN national Members. Ref. No. EN 932-6: 1999 E STDOBSI BS EN 932-b-ENGL 1779 LbZYbb9 117971118 080 D Page 2 EN 932-6:1999 Foreword This European Standard has been prepared by Technical Committee CENEC 154, Aggregates, the Secretariat of which is held by BSI. This European Standard shall be given
15、the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1999, and conflicting national standards shall be withdrawn at the latest by December 2003. According to the CENKENELEC Internal Regulations, the national standards organization
16、s of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This standard forms part of
17、a series of tests for general properties of aggregates. Test methods for other properties of aggregates will be covered by parts of the following European Standards: EN 933, Tests for geometrical properties of aggregates; EN 1097, Tests for mechanical and physical properties of aggregates; EN 1367,
18、Tests for thermal and weatheringproperties of aggregates; EN 1744, Tests for chemical properties of aggregates; EN 13 179, Tests for filler aggregate used in bituminous mixtures. The other parts of EN 932 will be: Part I: Methods for sampling; Part 2: Methods for reducing laboratory samples; Part 3:
19、 Procedure and terminology for simplijed petrographic description; Part 5: Common equipment and calibration. Contents Page Foreword I Scope 2 Definitions 3 Equations relating repeatability and reproducibility limits to standard deviations Annex A (informative) Bibliography 2 3 3 10 11 STD*BSI BS EN
20、932-6-ENGL 1999 Lb24bb9 0797LD9 TL7 D Page 3 EN 932-6:1999 1 Scope This European Siandard gives definitions of repeatability and reproducibility adapted from IS0 5725-1 to the specific situation of sampling and testing aggregates. These adjustments have been made because test portions or test specim
21、ens of aggregates are usually not identical to each other as specified in IS0 5725-1. 2 Definitions For the purposes of this European Standard, the following definitions apply. 2.1 sampling and sample reduction definitions 2.1.1 test portion sample used as a whole in a single test 2.1.2 test specime
22、n sample used in a single determination of a property when a test method requires more than one determination of a property 2.13 sampling error difference between the properties of a batch and a bulk sample that arises during the process of taking a bulk sample from the batch 2.1.4 bulk sample reduc
23、tion error difference between the properties of a bulk sample and a laboratory sample that arises during the process of reducing the bulk sample to a laboratory sample 2.1.5 laboratory sample reduction error difference between the properties of a laboratory sample and a test portion that arises duri
24、ng the process of reducing the laboratory sample to a test portion 2.1.6 between-laboratory testing variation variation that arises between test results from different laboratories because of differences between operators, apparatus, reagents, calibrations and environments 2.1.7 within-laboratory te
25、sting variation variation that arises between test results from the same laboratory when the operator, apparatus, reagents, calibrations and environments are not changed 2.1.8 variation between single determinations variation that arises between single determinations that are used to calculate one t
26、est result Q BSI 09-1 999 Page 4 EN 932-6:1999 2.2 repeatability definitions 2.2.1 critical range w, value less or equal to which the range of n single determination al, , cl“ made to obtain a test result is expected to lie within a probability of 95 % (see Figure i) NOTE This is the range when a te
27、st method requires n single determinations of a property, the test result being the average of n single determinations. The single determinations can be. averaged to the test result if their range does not exceed the critical range Wc. W, is calculated by the following equation: where An) is a facto
28、r, the values of which are given in Table I ; u* is the standard deviation of single determinations. 8 BSI 09- I999 STD-BSI BS EN 732-b-ENGL 1999 Lb2qbb9 0797331 b75 = Page 5 EN 932-6: 1999 4 a 4- 1 Laboratory sample 2 Test portion 3 Testspecimens 4 Determinations 5 Averaging determinations 6 Test r
29、esult NOTE The determinations can only be averaged to a test result = (a, +.A“) . if (u- - umin) 5 w, =fin) . u n Figure 1 -Calculation of a test result from n determinations al, . a, Table 1 -Values forAn) I 1 12 I 2.8 I O BSI 09-1 999 STD=BSI BS EN 932-b-ENGL 1977 II 1bZqbb7 0777112 501 D Page 6 E
30、N 932-6: 1999 21.2 repeatability r conditions conditions where test results are obtained with the same test method on identical test portions of aggregate, in the same laboratory, by the same operator, using the same equipment and within short intervals of time NOTE I For repeatability r conditions
31、to be achieved in practice a number of identical test portions of aggregate should be manufactured. NOTE 2 mie same operator”- it is acceptable if a team of operators works together, each taking on the responsibility for a particular stage of a test. NOTE 3 “A short interval of time”- with aggregate
32、 tests that take weeks or months to complete, test results are obtained under repeatability conditions if the tests start within a short interval of time of each other and finish within a short interval of time of each other. 2.2.3 repeatability rl conditions conditions where test results are obtain
33、ed with the same test method on different test portions of the same laboratory sample of aggregate, in the same laboratory, by the same operator, using the same equipment and within short intervals of time (see Figure 2) NOTE I The subscript “I” is added to indicate that the laboratory sample reduct
34、ion error contributes to the variations measured under YI conditions. Laboratory sample reduction error always occurs in practical situations when test portions are obtained from laboratory samples so that then rl conditions, not r conditions, apply. NOTE 2 The same operator”-it is acceptable if a t
35、eam of operators works together, each taking on the responsibility for a particular stage of a test. NOTE 3 “A short intemal of tirne”-with aggregate tests that take weeks or months to complete. test results are obtained under repeatability conditions if the tests start within a short interval of ti
36、me of each other and finish within a short interval of time of each other. XI x2 ( 3 i _ Dratory sample 2 Testportions 3 Test results NOTE XI and XZ are compatible and can be averaged if (XI - X2) 5 1.1 Figure 2 -Repeatability rl conditions Ca BSI 09-1999 Page 7 EN 932-6:1999 2.2.4 repeatability r o
37、r rl standard deviation standard deviation of test results obtained under repeatability r or rl conditions denoted by a, or a,., NOTE I The different sources of variation contained in u, or ur, are given in Table 2. NOTE 2 u, measures the within-laboratory testing variation and additionally the labo
38、ratory sample reduction emr. 2.2.5 repeatsbiiity value r or rl value less or equal to which the absolute difference between two test results, obtained under repeatability r or rl conditions, is expected to be within a probability of 95 % 2.3 reproducibiiiy definitions 2.3.1 reproducibiiity R conditi
39、ons conditions where test results are obtained with the same test method on identical test portions of aggregate, in different laboratories, by different operators using different equipment NOTE For reproducibility R conditions to be achieved in practice a number of identical test portions of aggreg
40、ate should be manufactured. 2.3.2 reproducibiiity RI conditions conditions where test results are obtained with the same test method on test portions of different laboratory samples of the same bulk sample, in different laboratories, by different operators using different apparatus (see Figure 3) NO
41、TE The subscript “i” indicates, as for repeatability ri conditions that sample reduction errors contribute to the variations measured under R conditions. O BSI 09-1999 Page 8 EN 932-6:1999 Bulk sample iaboratoiy sample Test portions Test results iaboratory A Laboratory B I l I I I I I I I I l I I I
42、I I I I l I I I I I / XA o Note XA and XB are compai.Jle and can -E average 1 Figure 3 -Reproducibility RI conditions 2.3.3 reproducibility R2 conditions conditions where test results are obtained with the same test method on different bulk samples of a batch, in different laboratories, by different
43、 operators using different apparatus (see Figure 4) NOTE The subscript 2” indicates that sampling errors and sample reduction errors contribute to the variations measured under R2 conditions. 8 BSI 09- I999 STD.BS1 BS EN 732-b-ENGL 1997 lb2Vbb 0797LL5 2LO H Page 9 EN 932-6: fi99 Batch Bulk samples L
44、aboratory samples Test portions Test results Laboratory A Laboratory B XA I I I I l I I I I l l I I l I I I I I I I I I I I XB o NOTE XA and XE are compatible and can be averaged if (XA -Xe) 5 R2. Figure 4 - Reproducibility R2 conditions 8 BSI 09-1 999 Page 10 EN 932-6:1999 Buk sample reduction erro
45、r Laboratory sample reduction error Between-laboratory testing miation Within-laboratory testing variation 23.4 reproducibility R, RI or R2 standard deviation standard deviation of test results obtained under reproducibility R, RI or R2 conditions, denoted by DR or UR, Of OR2 NOTE The different sour
46、ces of variation contained in UR, UR, and UR, can be seen in Table 2. J Table 2 - Sources of variation measured by repeatability r or rl and Source of error or variation Sampling error Sources of variation Sampling error Standard deviation OS Laboratory sample reduction error Between-laboratory test
47、ing variation R J J OSRL OL - Ri - J J J J Within-laboratory testing variation Variation between single determinations R2 4 Da J J J J J 23.5 reproducibility value R, RI or R2 value less or equal to which the absolute difference between two test results, obtained under reproducibility R, RI or R2 co
48、nditions, is expected to lie within a probability of 95 % NOTE Sampling errors are included in R2, but not in RI. Sampling errors always occur in practical situations when batches are sampled. If parties want to compare mults it is recommended that they obtain the results under Ri conditions. 3 Equa
49、tions relating repeatability and reproducibility limits to standard deviations 3.1 Standard deviations A standard deviation is associated with each of the sources of error or variation listed in clause 2 (see Table 3). I Bulk sample reduction error I u= O BSI 09-1999 STD-BSI BS EN 732-b-ENGL 1777 W 1b21ibb7 0797117 073 Page 11 EN 932-6:1999 3.2 Equations where ris 2,8 x ur rl is 2,8 x url R is 2,8 x UR RI is 2, 8 x UR, R2 is 2,8 x UR? Annex A (informative) Bibliography IS0 5725-1: 1994, Accuracy (trueness andprecision) of measurement methods and resul
