BS EN 933-3-2012 Tests for geometrical properties of aggregates Determination of particle shape Flakiness index《集料的几何性能试验 颗粒形状的测定 片状指数》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 933-3:2012Tests for geometrical properties of aggregatesPart 3: Determination of particle shape Flakiness indexBS EN 933-3:2012 BRITISH STANDARDNational forewordThis Britis

2、h Standard is the UK implementation of EN 933-3:2012. It supersedes BS EN 933-3:1997, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/502/6, Test methods.A list of organizations represented on this committee can be obtained on request to its secretar

3、y.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 74433 4 ICS 91.100.15 Compliance with a British Standard cannot co

4、nfer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationDate Text affectedBS EN 933-3:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 933-3 January 2012

5、 ICS 91.100.15 Supersedes EN 933-3:1997English Version Tests for geometrical properties of aggregates - Part 3: Determination of particle shape - Flakiness index Essais pour dterminer les caractristiques gomtriques des granulats - Partie 3: Dtermination de la forme des granulats - Coefficient daplat

6、issement Prfverfahren fr geometrische Eigenschaften von Gesteinskrnungen - Teil 3: Bestimmung der Kornform - Plattigkeitskennzahl This European Standard was approved by CEN on 29 October 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions fo

7、r giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in thre

8、e 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bod

9、ies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and U

10、nited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 933-3:201

11、2: EBS EN 933-3:2012 EN 933-3:2012 (E) 2 Contents Page Foreword . . 3g31g3 Scope. 5g32g3 Normative references . . 5g33g3 Terms and definitions . . 5g34g3 Principle . . 6g35g3 Apparatus . 6g36g3 Preparation of test portions . . 8g37g3 Procedure . 8g37.1g3 Sieving on test sieves. . 8g37.2g3 Sieving on

12、 bar sieves . . 8g38g3 Calculation and expression of results . 8g39g3 Test report . . 9g39.1g3 Mandatory data . 9g39.2g3 Optional data . . 9g3Annex A (informative) Example of test data sheet . 10g3Annex B (informative) Precision . . 11g3BS EN 933-3:2012 EN 933-3:2012 (E) 3 Foreword This document (EN

13、 933-3:2012) has been prepared by Technical Committee CEN/TC 154 “Aggregates”, the secretariat of which is held by BSI. 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 July 2012, and conflicting n

14、ational standards shall be withdrawn at the latest by July 2012. 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 patent rights. This document superse

15、des EN 933-3:1997. The following changes have been made to the previous edition: a) the CEN Technical Specification has been adopted as European Standard; b) the document has been editorially revised. This standard forms part of a series of tests for geometrical properties of aggregates. Test method

16、s for other properties are covered by the following European Standards: EN 932 Tests for general properties of aggregates; EN 1097 Tests for mechanical and physical properties of aggregates; EN 1367 Tests for thermal and weathering properties of aggregates; EN 1744 Tests for chemical properties of a

17、ggregates; EN 13179 Tests for filler aggregate used in bituminous mixtures. EN 933, Tests for geometrical properties of aggregates, consists of the following parts: Part 1: Determination of particle size distribution Sieving method; Part 2: Determination of particle size distribution Test sieves, no

18、minal size of apertures; Part 3: Determination of particle shape Flakiness index; Part 4: Determination of particle shape Shape index; Part 5: Determination of percentage of crushed and broken surfaces in coarse aggregate particles; Part 6: Assessment of surface characteristics Flow coefficient of a

19、ggregates; Part 7: Determination of shell content Percentage of shells for coarse aggregates; Part 8: Assessment of fines Sand equivalent test; BS EN 933-3:2012 EN 933-3:2012 (E) 4 Part 9: Assessment of fines Methylene blue test; Part 10: Assessment of fines Grading of filler aggregates (air jet sie

20、ving); Part 11: Classification test for the constituents of coarse recycled aggregate. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

21、Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 933-3:2012 EN 933-3:2012 (E) 5 1

22、Scope This European Standard describes the reference method, used for type testing and in case of dispute, for determination of the flakiness index of aggregates. For other purposes, in particular production control, other methods may be used, provided that an appropriate working relationship with t

23、he reference method has been established. This European Standard applies to natural, manufactured or recycled aggregates. The test procedure specified in this part of this European Standard is not applicable to particle sizes less than 4 mm or greater than 100 mm. 2 Normative references The followin

24、g 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. EN 932-2, Tests for

25、 general properties of aggregates Part 2: Methods for reducing laboratory samplesEN 932-5, Tests for general properties of aggregates Part 5: Common equipment and calibrationEN 933-1, Tests for geometrical properties of aggregates Part 1: Determination of particle size distribution Sieving method EN

26、 933-2, Tests for geometrical properties of aggregates Part 2: Determination of particle size distribution Test sieves, nominal size of apertures 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 constant mass mass determined by successive weig

27、hings performed at least 1 h apart and not differing by more than 0,1 % Note 1 to entry: In many cases, constant mass can be achieved after a test portion has been dried for a pre-determined period in a specified oven (see 5.4) at (110 5) C. Test laboratories can determine the time required to achie

28、ve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used. 3.2 laboratory sample sample intended for laboratory testing 3.3 particle size fraction(di/Di) fraction of an aggregate passing the larger (Di) of two sieves and retained on the smaller (di)

29、Note 1 to entry: The lower limit for dimay be zero. 3.4 test portion sample used as a whole in a single test BS EN 933-3:2012 EN 933-3:2012 (E) 6 4 Principle The test consists of two sieving operations. First, using test sieves, the sample is separated into various particle size fractions di/Di, as

30、given in Table 1. Each of the particle size fractions di/Diis then sieved using bar sieves which have parallel slots of width Di/2. The overall flakiness index is calculated as the total mass of particles passing the bar sieves expressed as a percentage of the total dry mass of particles tested. If

31、required, the flakiness index of each particle size fraction di/Diis calculated as the mass of particles passing the corresponding bar sieve, expressed as a percentage by mass of that particle size fraction. 5 Apparatus All apparatus shall conform to the general requirements of EN 932-5. 5.1 Test si

32、eves, with square apertures, conforming to EN 933-2 with the following aperture sizes: 100 mm; 80 mm; 63 mm; 50 mm; 40 mm; 31,5 mm; 25 mm; 20 mm; 16 mm; 12,5 mm; 10 mm; 8 mm, 6,3 mm; 5 mm and 4 mm. 5.2 Corresponding bar sieves, comprising parallel cylindrical bars conforming to the requirements in T

33、able 1. The tolerances on the width of slot shall apply to the entire length of each slot. An example of a bar sieve is shown in Figure 1. Table 1 Bar sieves Particle size fraction di/DiWidth of slot in bar sieve mm mm80/100 50 0,5 63/80 40 0,5 50/63 31,5 0,5 40/50 25 0,4 31,5/40 20 0,4 25/31,5 16 0

34、,4 20/25 12,5 0,4 16/20 10 0,2 12,5/16 8 0,2 10/12,5 6,3 0,2 8/10 5 0,2 6,3/8 4 0,15 5/6,3 3,15 0,15 4/5 2,5 0,15 BS EN 933-3:2012 EN 933-3:2012 (E) 7 Key 1 metal frame (outside wooden frame optional) 2 width of slot as specified in Table 1 3 cylindrical steel bars (usual diameter range from 5 to 15

35、 mm depending on width of slot) L = 250 mm to 300 mm H = 75 mm h = 55 mm to 65 mm NOTE L being constant for all range of bar sieves, the width of the last slot cannot be equal to the nominal value. In all cases, it should be smaller than the nominal value. Figure 1 Example of a bar sieve 5.3 Balance

36、 or scale, accurate to 0,1 % of the mass of the test portion. 5.4 Ventilated oven, thermostatically controlled to maintain a temperature of (110 5) C or other suitable equipment for drying the aggregates, without causing any particle size breakdown. BS EN 933-3:2012 EN 933-3:2012 (E) 8 6 Preparation

37、 of test portions The laboratory sample shall be reduced in accordance with EN 932-2. The mass of the test portion shall be as specified in EN 933-1. Dry the test portion at (110 5) C to constant mass. Allow to cool, weigh and record the mass as M0. 7 Procedure 7.1 Sieving on test sieves Using the a

38、ppropriate range of sieves from those specified in 5.1, sieve the test portion as specified in EN 933-1. Weigh and discard all particles passing the 4 mm sieve and retained on the 100 mm sieve. Weigh and retain separately all the particles in each particle size fraction di/Di. 7.2 Sieving on bar sie

39、ves Sieve each particle size fraction di/Diobtained from 7.1 on the corresponding bar sieve given in Table 1. This sieving operation can be carried out manually or mechanically and shall ensure complete separation. Weigh the material from each particle size fraction passing through the corresponding

40、 bar sieve. 8 Calculation and expression of results The results shall be recorded on test data sheets (see example in Annex A). Calculate the sum of the masses of the particle size fractions di/Diand record as M1. Calculate the sum of the masses of the particles in each of the particle size fraction

41、s di/Diwhich pass through a corresponding bar sieve of slot width Di/2 and record as M2. The overall flakiness index FI is calculated from the following equation: FI = (M2/M1) 100 (1) where M1 is the sum of the masses of the particles in each of the particle size fraction di/Di, in grams; M2 is the

42、sum of the masses of the particles in each particle size fraction passing the corresponding bar sieve of slot width Di/2 in grams. The overall flakiness (FI) shall be recorded to the nearest whole number. BS EN 933-3:2012 EN 933-3:2012 (E) 9 The flakiness index for each particle size fraction FIisha

43、ll be calculated, if required, from the following equation: FIi= (mi/Ri) 100 (2) where Ri is the mass of each particle size fraction di/Di, in grams; mi is the mass of the material in each particle size fraction di/Diwhich passes through the corresponding bar sieve of slot width Di/2, in grams. If t

44、he sum of the masses Ritogether with the masses of any discarded particles and any size fractions that are not tested (see 7.1) differs by more than 1 % from the mass M0(see Clause 6), the test shall be repeated, using another test portion. 9 Test report 9.1 Mandatory data The test report shall incl

45、ude the following information: a) reference to this European Standard; b) identification of the sample; c) identification of the laboratory; d) mass of test portion; e) overall flakiness index FI to the nearest whole number; f) sample reception date. 9.2 Optional data The test report may include the

46、 following information: a) name and location of the sample source; b) description of the material and of the sampling procedure; c) flakiness index FIiof each particle size fraction to the nearest whole number; d) sampling certificate; e) date of test. BS EN 933-3:2012 EN 933-3:2012 (E) 10 Annex A(i

47、nformative) Example of test data sheet Flakiness Index Laboratory: EN 933-3 Identification of the sample: Date of reception: Operator:Test portion mass M0= g Mass retained on the 100 mm sieve = g Mass passing the 4 mm sieve = g g326g326g326 Sum of discarded masses = g Sieving on test sieves Sieving

48、on bar sieves Particle size fraction di/DiMass Riof particle size fraction di/Di Nominal width of slot in bar sieve Mass mipassing bar sieve FIimm g mm g = (mi/Ri) 100 80/100 50 63/80 40 50/63 31,5 40/50 25 31,5/40 20 25/31,5 16 20/25 12,5 16/20 10 12,5/16 8 10/12,5 6,3 8/10 5 6,3/8 4 5/6,3 3,15 4/5

49、 2,5 M1= g520Ri= M2= g520mi= FI = (M2/M1) 100 = ( ) ( ) 0i0 masses fractiontested notmasses discarded100 MRM g166g166 g166+ 1 % BS EN 933-3:2012 EN 933-3:2012 (E) 11 Annex B(informative) Precision The results of a cross testing experiment carried out by 20 laboratories in 1994, as part of a project (Project 134) funded by the European Community under the Measurements and Testing Programme, are given in Table B.1. The repeata