1、STD-BSI BS EN 933-7-ENGL 3998 m 3b24bb9 0732297 485 m BRITISH STANDARD Tests for geometrical properties of aggregates - Part 7: Determination of shell content - Percentage of shells in coarse aggregates The European Standard EN 933-71998 has the status of a British Standard ICs 91 D0.20 BS EN 933-7:
2、1998 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services- BS EN 933-7:1998 Amd. No. National foreword Date Text affected This British Standard is the English ianguage version of EN 9337:1998.
3、 It supersedes BS 812-106:1985 which, it is intended, will be withdrawn on 199912-01 if ali the European Standards included in the package are available. The UK participation in its preparation was entrusted by Technical Committee BJ502, Aggregates, to Subcommitke WZ6, Test methods, which has the re
4、sponsibility to: - aid enquirers to undersand the text; - present to the responsible European committee any enquiries on the - monitor related internaiionai and European developments and promulgate interpretation, or proposals for change, and keep the K interests informed, them in the UK. A list of
5、organkdions 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 found in the BSI Standards Catalogue under the section entitled “Internationai S
6、tandards Correspondence Index”, or by using the ”Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible for their correct appidon. Compliance with a British Standa
7、rd 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 5 and a back cover. This British Standard, having been prepared under the direction of the Sector Board for Buiiding and Civil En
8、gineering, was published under the authority of the Standards Board and comes into effect on 16 July 1998 Q BSI 1998 ISBN O pis0 29780 2 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN 933-7-ENGL 3998 = 1624669 0732299 258 EUROPEAN sTANDAR6) NOR
9、lME EUR0PEE”E EUROP- NORM EN 933-7 March 1998 ICs 91.100.20 Descriptors: Aggregates, tests, geometrical characteristics, determination, percentage, gravel English version Tests for geometrical properties of -gates - Part 7: Detemination of shell content - Percentage of shells in coarse aggregates Es
10、sais pour dterminer les proprits gomtxiques des gran is the mass of the shells and shell fragments, in grams- Record the value of SC to the nearest whole number. 8.2 Test portions where D 2 d 8.2.1 Size fractions not reduced If no size fractions have been reduced calculate the shell content in accor
11、dance with the following equation: where: Mli is the sum of the masses in the size fractions testeclingramS. fhgments in each of the size fractions tested, in grams. C Mzi is the sum of the 111i1sses of shells and shell Record the value of SC to the nearest whole number. 8.2.2 Reduced size fiations
12、If any size fractions have been reduced calculate the percentages by mas of shells and shell i-agments in each particle size fraction and record as SCi. Calculate the weighted mean percentage value of the shells and sheil fragments in accordance with the following equation: where: Vi is the percenta
13、ge by mass of particle size Won i in the sample tested; SCi is the percentage by mass of shells and shell hgments in particle size fraction i. Record the weighted mean percentage of shells and she1 fragments to the nearest whole number. O BSI 1998 COPYRIGHT European Committee for StandardizationLice
14、nsed by Information Handling Services9 hst report 9.1 Required data The test report shall include the following information: a) reference to this European Standar b) identification of the sample; c) identification of the laboratory; d) sample reception date; e) shell content SC, to the nearest whole
15、 number, f) where applicable, the weighted mean percentage. EN 9337 Identification of the sample: Page 6 EN 933-E1998 Laboratory: Date: Operator: 9.2 Optionai data The test report may include the information: a) name and location of the sample source; b) description of the material and of the sample
16、 reduction procedure; c) visual description of shells (e.g., hollow or lat); d) mass of sample MO; e) mass of test portion MI; f) mass of shells and fragments M2; g) any size fraction consisting of less than 100 particles; h) sampling certificate, if available; i) date of test. Particle size fractio
17、n dDi Mass Mi Mass M, where Di I 2 4 mm ! g Shell content SC (to the nearest whole number) % = (MdMl) x 100 O BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesBS EN 933-71998 BSI 383 Chiswick High Road London w4 4AL BSI - British Standards Institution
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