BS EN 451-2-2017 Method of testing fly ash Determination of fineness by wet sieving《飞灰的试验方法 用湿筛法测定细度》.pdf

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1、Method of testing fly ashPart 2: Determination of fineness by wet sievingBS EN 4512:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN 4512:2017. It supersedes BS EN 4512:1995 , which is withdrawn

2、.The UK participation in its preparation was entrusted to Technical Committee B/517/4, Additions for concrete.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Use

3、rs are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 90157 7ICS 91.100.30Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority o

4、f the Standards Policy and Strategy Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARDBS EN 4512:2017EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 4512May 2017ICS 91.100.30 Supersedes EN 4512:1994EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT

5、 EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN Ref. No. EN 4512:2017: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersMethod of testing fly ash Part 2: Determination

6、of fineness by wet sievingMthode dessai des cendres volantes Partie 2: Dtermination de la finesse par tamisage humidePrfverfahren fr Flugasche Teil 2: Bestimmung der Feinheit durch NasssiebenThis European Standard was approved by CEN on 27 February 2017.CEN members are bound to comply with the CEN/C

7、ENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC Management Centre o

8、r 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 into its own language and notified to the CENCENELEC Management Centre has the same status as the offic

9、ial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, N

10、orway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN 451-2:2017 (E)European foreword 31 Scope .42 Normative references 43 Terms and definitions .44 Reagents 44.2 Destilled water. . 45 Apparatus .45.1 Sieve. 45.2 Spray n

11、ozzle. . 55.3 Pressure gauge. . 55.4 Weighing bottle. . 55.5 Oven. 55.6 Desiccator. . 55.7 Balance. 56 Checking the Test Sieve 77 Preparation of sample 88 Procedure.89 Calculation 810 Results .911 Repeatability and reproducibility 92Contents PageBS EN 4512:2017EN 451-2:2017 (E)European forewordThis

12、document (EN 4512:2017) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by

13、 November 2017, and conflicting national standards shall be withdrawn at the latest by November 2017.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such

14、patent rights.This document supersedes EN 4512:1994 .EN 451, Method of testing fly ash, is currently composed with the following parts: Part 1: Determination of free calcium oxide content; Part 2: Determination of fineness by wet sieving the present document.According to the CEN/CENELEC Internal Reg

15、ulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland,

16、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.3BS EN 4512:2017EN 451-2:2017 (E)1 ScopeThis European Standard specifies the method for the determination of fly ash fine

17、ness by wet sieving on a 0,045 mm sieve (ISO 565).The European Standard specifies the reference procedure. If other methods are used it needs to be shown that they give results equivalent to those obtained by the reference method. In case of a dispute, only the reference method is used.2 Normative r

18、eferencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies

19、.EN 4501:2012 , Fly ash for concrete Part 1: Definition, specifications and conformity criteriaISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openingsISO 33101 , Test sieves Technical requirements and testing Part 1: Test sieves of metal wire c

20、loth3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1constant masssuccessive weighings made after drying at intervals of at least 1 h, not differing by more than 0,1 %NOTE In many cases constant mass can be achieved after a test portion has been

21、dried for a predetermined period in a specified oven at (105 5) C. Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used.4 Reagents4.1 Alcohol, e.g. Butan2ol.4.2 Destilled water.5 Apparatu

22、sThe complete apparatus is shown in Figure 1 and consists of:5.1 Sieve.The sieve frame shall be constructed of durable material not susceptible to corrosion or distortion by oven heat. The frame is essentially a tube of 50 mm nominal diameter and measuring 75 mm from the top of the frame to the siev

23、e cloth, with facilities for removing and replacing the cloth. The stainless steel sieve cloth of a mesh size of 0,045 mm shall conform to ISO 565 and ISO 33101 and be free of visible irregularities such as creases, poor cloth tension, scratches or irregular markings when inspected visually as descr

24、ibed in ISO 33101 . The sieve cloth shall be suitably sealed in the case and uniformly tensioned in the frame to prevent loss of material.4 BS EN 4512:2017EN 451-2:2017 (E)5.2 Spray nozzle.The spray nozzle (Figure 2) shall be constructed of metal not susceptible to corrosion by water, with an inside

25、 diameter of 17,5 mm. The spray nozzle shall have a central hole drilled parallel to the longitudinal axis, and an intermediate row of eight holes drilled 6 mm centretocentre at an angle of 5 to the longitudinal axis and an outer row of eight holes drilled 11 mm centretocentre at an angle of 10 to t

26、he longitudinal axis. All holes shall be 0,5 mm in diameter and be fully functional.5.3 Pressure gauge.The pressure gauge shall have a minimum diameter of 80 mm and a maximum scale capacity of 160 kPa, graduated at maximum intervals of 5 kPa. The resolution of the gauge shall be 5 kPa.5.4 Weighing b

27、ottle.A weighing bottle of sufficient size (e.g. diameter of 80 mm, height of 30 mm, volume 80 ml).5.5 Oven.A wellventilated drying oven regulated at (105 5) C.5.6 Desiccator.Desiccator, containing a drying agent, e.g. silica gel.5.7 Balance.A balance with a resolution of 0,001 g.5BS EN 4512:2017EN

28、451-2:2017 (E)Dimensions in millimetresKeya = 10 mm to 15 mm1 water tap2 pressure gauge3 spray nozzle4 sieve frame5 sieve clothFigure 1 Device6 BS EN 4512:2017EN 451-2:2017 (E)Dimensions in millimetresKey1 outer row2 intermediate row3 central hole4 spray nozzle with 17 holes of 0,5 mm diameterFigure

29、 2 Spray nozzle6 Checking the Test SieveA reference material, consisting of rounded particles with a known proportion of material coarser than the specified mesh size shall be used for checking the sieve (5.1). The material shall be stored in sealed, airtight containers, to preclude changes in its p

30、roperties due to deposition or absorption from the atmosphere.Test sieves shall be checked when new and at intervals not exceeding 100 tests. The sieve cloth shall first be inspected visually as described in ISO 33101 . Any sieve with an imperfect or damaged sieve cloth shall be rejected. The sieve

31、shall be cleaned after every five tests, for example by backflushing with water.7BS EN 4512:2017EN 451-2:2017 (E)Determine the fineness of the reference material as described in Clause 8. Calculate the correction factor f for the test sieve with Formula (1):(1)wheref is the correction factor;rris th

32、e percentage by mass of the reference material retained by the test sieve;rtis the known 0,045 mm sieve residue in percentage by mass of the reference material.The test shall be performed twice and the mean value of f taken as the correction factor. It shall be within the limits 0,8 and 1,2 otherwis

33、e the sieve cloth shall be replaced and the test repeated.7 Preparation of sampleSubdivide the laboratory sample, prepared in accordance with EN 4501:2012 , Clause 7 by a suitable method to obtain a subsample of appropriate size.8 ProcedureDry a sample of at least 1,0 g in the oven (5.5) at (105 5)

34、C to a constant mass.For the test sample, transfer approximately 1,0 g, weighed to the nearest 0,001 g, of the ovendry sample to a clean and dry sieve (5.1).Wet the sample thoroughly with a gentle flow of water, for example, by using a handheld wash bottle. Set the water pressure to (80 5) kPa and p

35、lace the sieve in position under the spray nozzle (5.2) and wash for (60 10) s, keeping the lower end of the nozzle between 10 mm and 15 mm below the top of the sieve frame, and swirling the sieve horizontally at about 1 revolution per second.Remove the sieve from under the nozzle, rinse with approx

36、imately 50 ml alcohol or distilled water and blot up residual moisture from the underside of the sieve cloth. Dry the sieve and residue to a constant mass in the oven (5.5) at (105 5) C. Cool the sieve and the residue in a desiccator (5.6), and weigh the residue to the nearest 0,001 g.In case of sys

37、tems with removable cloth remove the cloth from the sieve and place the sieve cloth with the sample into a weighing bottle (5.4). Clean the upper sieve frame by rinsing with alcohol or water into the weighing bottle. Continue for drying, cooling and weighing as described above.The sieve should be dr

38、ied in an oven before performing the test. After cooling the sieve should be weighed to allow weighing the residue.9 CalculationCalculate the fineness of the sample as a percentage by mass to the nearest 0,10 % with Formula (2):(2)wherer is the fineness of the sample expressed as the 0,045 mm sieve

39、residue fraction in percentage by mass,f is the sieve correction factor (see Clause 5),mSis the mass of sample residue (g),mOis the mass of test sample (g).8 BS EN 4512:2017EN 451-2:2017 (E)10 ResultsReport the mean value of r from the two tests, expressed to one decimal place, as the fineness of th

40、e fly ash. lf the two values differ by more than 0,3 %, repeat the test on further samples until two values are obtained that differ by not more than 0,3 %.11 Repeatability and reproducibilityThe standard deviation for repeatability is 0,02 % by mass. (according to laboratory specific information)Th

41、e standard deviation for reproducibility is 0,07 % by mass. (according to Round Robin Test of 13 laboratories)NOTE It is a measure of the dispersion of the distribution of test results under repeatability (reproducibility) conditions.9BS EN 4512:2017This page deliberately left blankThis page deliber

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