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 It supersedes BS EN 4512:1995 , which is withdrawn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
42、ately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards
43、Institution (BSI)About usWe bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through
44、 our open consultation process. Organizations of all sizes and across all sectors choose standards to help them achieve their goals.Information on standardsWe can provide you with the knowledge that your organization needs to succeed. Find out more about British Standards by visiting our website at
45、 or contacting our Customer Services team or Knowledge Centre.Buying standardsYou can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at where hard copies can also be purchased. If you need international and
46、foreign standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team.Copyright in BSI publicationsAll the content in BSI publications, including British Standards, is the property of and copyrighted by BSI or some person or entity that owns cop
47、yright in the information used (such as the international standardization bodies) and has formally licensed such information to BSI for commercial publication and use.Save for the provisions below, you may not transfer, share or disseminate any portion of the standard to any other person. You may no
48、t adapt, distribute, commercially exploit, or publicly display the standard or any portion thereof in any manner whatsoever without BSIs prior written consent.Storing and using standardsStandards purchased in soft copy format: A British Standard purchased in soft copy format is licensed to a sole na
49、med user for personal or internal company use only. The standard may be stored on more than 1 device provided that it is accessible by the sole named user only and that only 1 copy is accessed at any one time. A single paper copy may be printed for personal or internal company use only.Standards purchased in hard copy format: A British Standard purchased in hard copy format is for personal or internal company use only. It may not be further reproduced
