Standard Roman

ICS 91.100.15

SR EN 933-3

A lunie 2012

ASRÖ

Titlu

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încercàri pentru determinarea caracteristicilor geometrice aie agregatelor Partea 3: Determinarea formei granulelor-Coeficient de aplatizare

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Tests for geometrical properties of aggregates. Part 3: Determination of particle shape • Flakiness index

Essais pour déterminer les caractéristiques géométriques des granuláis. Partie 3: Détermination de la forme des granulats - Coefficient d'aplatissement

Aprobare

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Corespondents

Aprobat de Directorul General al A S R O la 29 iunie 2012

Standardu l european E N 933-3:2012 a fost adoptat prin metoda notei de confirmare si are statutul unui standard román

ínlocuieste S R E N 933-3:2002 si S R E N 933-3 :2002/A1:2004

Data publicärii versiunii romäne: -

Aces t s tandard este identic cu standardul european E N 933-3 :2012

ASOCIATIA DE STANDARDIZARE DIN ROMANIA Str. Mendeleev nr. 21-25, cod 010362, Bucuresti, 8 www.asro.ro

© ASRO Reproducerea sau utilizarea integrala sau partialà a prezentului standard in orice publicatii si prin orice procedeu (electronic, mecanic, fotocopiere, microfilmare etc.) este interzisá dacá nu exista acordul scris prealabil al ASRO

Ref SR EN 933-3:2012 Editia 2

EUROPEAN STANDARD EN 933-3 NORME EUROPÉENNE EUROPÄISCHE NORM J a n u a r y 2 0 1 2

ICS 91.100.15 Supersedes EN 933-3:1997

Engl ish Vers ion

Tests for geometrical properties of aggregates - Part 3: Determination of particle shape - Flakiness index

Essais pour déterminer les caractéristiques géométriques Prüfverfahren für geometrische Eigenschaften von des granulats - Partie 3: Détermination de la forme des Gesteinskörnungen - Teil 3: Bestimmung der Kornform -

granulats - Coefficient d'aplatissement 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 for 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 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 CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies 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 United Kingdom.

ft EUROPEAN COMMUTEE FOR STANDAREMZAI ION COMITÉ EUROPÉEN D t N O R M A L I S A T I O N EUROPÄISCHES KOMITEE FÜR 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 933-3:2012: E

E N 933-3:2012 (E)

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Contents P a g e

Foreword 3

1 Scope 5

2 Normative references 5

3 Terms and definitions 5

4 Principle 6

5 Apparatus 6

6 Preparation of test portions 8

7 Procedure 8 7.1 Sieving on test sieves 8 7.2 Sieving on bar sieves 8

S 8 Calculation and expression of results 8 o

J 9 Test report 9 85 9.1 Mandatory data 9 < 9.2 Optional data 9

^ Annex A (informative) Example of test data sheet 10

n Annex B ( informative) Precision 11 o K e =5 £ ra h f ro

TJ C B CO CD T3

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E N 933-3:2012 (E)

Foreword

Th is document ( E N 933-3:2012) has been prepared by Techn ica l Commi t tee C E N / T C 1 5 4 "Aggregates" , the secretariat of which is held by BSI .

Th is European Standard shal l be given the status of a national s tandard, either by publ icat ion of an identical text or by endorsement , at the latest by July 2012, and conflicting national s tandards shal l be withdrawn at the latest by July 2012.

Attention is drawn to the possibil i ty that s o m e of the e lements of this document may be the subject of patent rights. C E N [and/or C E N E L E C ] shal l not be held responsib le for identifying any or all such patent rights.

Th is document supersedes E N 933-3:1997.

T h e following changes have been made to the previous edit ion:

§ a) the C E N Techn ica l Speci f icat ion has been adopted as European Standard ;

J Jo b) the document has been editorially revised.

3 Th is standard forms part of a ser ies of tests for geometr ical properties of aggregates . Test methods 2 for other propert ies arc covered by the following European Standards : ra

I E N 932 Tests for general properties of aggregates; B

"•5 E N 1097 Tests for mechanical and physical properties of aggregates;

j | E N 1367 Teste for thermal and weathering properties of aggregates;

E N 1744 Tests for chemical properties of aggregates;

1 a E N 13179 Tests for filler aggregate used in bituminous mixtures.

E N 933 . Tests for geometrical properties of aggregates, cons is ts of the fol lowing parts:

1 5 — Part 1; Determination of particle size distribution — Sieving method;

— Part 2; Determination of particle size distribution — Test sieves, nominal 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 aggregates;

— Part 7: Determination of shell content — Percentage of shells for coarse aggregates;

— Part 8: Assessment of fines — Sand equivalent test;

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EN 933-3:2012 (E)

— Part 9: Assessment of fines — Methylene blue test;

— Pari 10: Assessment of fines — Grading of filler aggregates (air jet sieving);

— Part 11: Classification test for the constituents of coarse recycled aggregate.

Acco rd ing to the C E N / C E N E L E C Internal Regulat ions, the national s tandards organizat ions of the fol lowing countr ies are bound to implement this Eu ropean Standard: Austr ia , Be lg ium, Bulgar ia , Croat ia , Cyp rus , C z e c h Repub l i c , Denmark , Eston ia , F in land, F rance , Germany , G r e e c e , Hungary , Iceland, Ireland, Italy, Latv ia , L i thuania, Luxembourg , Mal ta, Nether lands, Norway, Po land , Portugal , R o m a n i a , S lovak ia , S loven ia , Spa in , S w e d e n , Swi tzer land, Turkey and the United K ingdom.

EN 933-3:2012 (E)

f 1 Scope

This European Standard descr ibes the reference method, used for type testing and in c a s e of d ispute, for determination of the f lakiness index of aggregates. For other purposes, in particular product ion control, other methods may be used , provided that an appropriate working relat ionship with the reference method has been establ ished.

Th is European Standard appl ies to natural, manufactured or recycled aggregates.

The test procedure specif ied in this part of this European Standard is not appl icable to particle s i zes less than 4 mm or greater than 100 mm.

2 Normative references

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T h e following documents , in whole or in part, are normatively referenced in this document and are ind ispensable for its appl icat ion. For dated references, only the edit ion cited appl ies . For undated references, the latest edition of the referenced document (including any amendments ) app l ies .

g S E N 932-2, Tests for general properties of aggregates — Part 2: Methods for reducing laboratory samples o

E N 932-5 , Tests for general properties of aggregates — Part 5: Common equipment and calibration to J E N 933-1 , Tests for geometrical properties of aggregates— Part ^Determination of particle size < distribution — Sieving method

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™ E N 933-2, Tests for geometrical properties of aggregates — Part 2: Determination of particle size o distribution — Test sieves, nominal size of apertures

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3 Terms and definitions

For the purposes of this document , the following terms and definitions apply.

3.1 constant mass m a s s determined by success i ve weighings 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 pre­determined period in a specified oven (see 5.4) at (110 ± 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.

3.2 laboratory sample sample intended for laboratory testing

3.3 particle size fraction(d,/Di) fraction of an aggregate passing the larger (D,) of two s ieves and retained on the smal ler (di)

Note 1 to entry: The lower limit for di may be zero.

3.4 test portion sample used a s a whole in a single test

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EN 933-3:2012 (E)

4 Principle

T h e test cons is ts of two s iev ing operat ions. First, using test s ieves , the samp le is separa ted into var ious particle s ize fractions dJD„ a s given in Tab le 1. E a c h of the particle s ize fractions dJDx is then s ieved using bar s ieves which have parallel slots of width D,/2.

T h e overal l f lak iness index is calculated a s the total m a s s of part icles pass ing the bar s ieves e x p r e s s e d a s a percentage of the total dry m a s s of particles tested.

If required, the f lak iness index of each particle s ize fraction dJDK is calculated as the m a s s of part icles pass ing the cor responding bar s ieve, expressed a s a percentage by m a s s of that particle s ize fraction.

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5 Apparatus

Al l appara tus shal l conform to the genera l requirements of E N 932-5 .

5.1 Test sieves, with square apertures, conforming to E N 933-2 with the following aperture s i z e s : 100 m m ; 80 m m ; 63 m m ; 50 m m ; 40 mm; 31,5 mm; 25 m m ; 20 mm; 16 mm; 12,5 mm; 10 m m ; 8 mm, 6,3 m m ; 5 mm and 4 m m .

5.2 Corresponding bar sieves, compr is ing parallel cyl indrical bars conforming to the requirements in Tab le 1. T h e to lerances on the width of slot shal l apply to the entire length of each slot. A n examp le of a bar s ieve is shown in F igure 1.

Table 1 — Bar sieves

Particle size fraction oVD,

m m

Width of slot in bar sieve

mm

80/100 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 , 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 , 1 5

5/6,3 3 , 1 5 1 0 , 1 5

4/5 2,5 ± 0 , 1 5

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EN 933-3:2012 (E)

0 \ \ \ \ \ s ^ r l \ \ \ \ \ \ \ \ ^

A - A

r A

—J

*

7 A

2

r A

—J

7 A

2

r A

—J

L

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 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 or scale, accurate to ± 0,1 % of the mass of the test portion.

5.4 Ventilated oven, thermostatical ly control led to maintain a temperature of (110 ± 5) °C or other sui table equipment for drying the aggregates, without caus ing any particle s ize b reakdown.

EN 933-3:2012 (E)

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©

CD •D

r 6 Preparation of test portions

T h e laboratory sample shal l be reduced in accordance with E N 932-2.

T h e m a s s of the test portion shall be a s specif ied in E N 933-1 .

Dry the test portion at (110 t 5) °°C to constant mass . Al low to coo l , weigh and record the m a s s a s M0.

7 Procedure

7.1 Sieving on test sieves

Us ing the appropr iate range of s ieves from those speci f ied in 5.1, s ieve the test portion a s speci f ied in E N 933-1 .

W e i g h and d iscard all particles pass ing the 4 mm sieve and retained on the 100 mm sieve.

W e i g h and retain separately all the particles in each particle s ize fraction dJO,.

7.2 Sieving on bar sieves

S i e v e e a c h particle s i ze fraction d-JD-, obtained from 7.1 on the corresponding bar s ieve g iven in < Tab le 1. Th is s iev ing operat ion can be carr ied out manual ly or mechanica l ly and shal l ensure ^ comple te separa t ion .

% W e i g h the material from each particle s ize fraction passing through the corresponding bar s ieve.

I € 8 Calculation and expression of results ro :g T h e results shal l be recorded on test data sheets (see example in Annex A) . Calcu late the sum of the «j m a s s e s of the particle s ize fractions dJDt and record as My ro vj Ca lcu la te the s u m of the m a s s e s of the particles in each of the particle s ize fractions dJD{ which pass

through a corresponding bar s ieve of slot width D,/2 and record as M2.

T h e overall f lakiness index Fl is calculated from the following equation:

F/ = (M2IM^)x 100 (1)

where

Mi is the s u m of the m a s s e s of the part icles in each of the particle s ize fraction d-JD-,, in g rams ;

M2 is the s u m of the m a s s e s of the part icles in e a c h particle s ize fraction pass ing the cor responding bar s ieve of slot width D,I2 in g rams.

The overal l f lakiness (Fl) shall be recorded to the nearest whole number.

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EN 933-3:2012 (E)

The f lakiness index for each particle s ize fraction Fl, shall be calculated, if required, from the following equation:

FI, = {mJR,)x 100 (2)

where

R, is the m a s s of each particle s ize fraction dJDy, in g rams;

m, is the m a s s of the material in each particle s ize fraction d /D , which p a s s e s through the corresponding bar s ieve of slot width DJ2, in g rams.

If the sum of the m a s s e s R, together with the m a s s e s of any d iscarded particles and any s i ze fract ions that are not tested (see 7.1) differs by more than 1 % from the m a s s M0 (see C l a u s e 6), the test shal l be repeated, using another test portion.

9 Test report

9.1 Mandatory data

© The test report shall include the following information:

4 tn a) reference to this European Standard;

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b) identification of the sample;

' c £j c) identification of the laboratory;

K c d) m a s s of test portion; '•5

e) overall f lakiness index Fl to the nearest whole number;

.§ f) sample reception date, c 2

I 9.2 Optional data

-J5 The test report may include the following information:

^ a) name and location of the sample source;

b) description of the material and of the sampl ing procedure;

c) f lakiness index Fl, of each particle size fraction to the nearest whole number;

d) sampl ing certificate;

e) date of test.

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E N 933-3:2012 (E)

Annex A (informative)

Example of test data sheet

Flakiness Index

EN 933-3

Laboratory:

Identification of the sample : Date of reception:

Operator:

Tes t portion m a s s MQ = g M a s s retained on the 100 mm sieve = g

M a s s pass ing the 4 mm sieve = g

S u m of d iscarded m a s s e s = g

S iev ing on test s ieves S iev ing on bar s ieves

Part ic le s ize fraction dJD,

M a s s R, of particle s ize fraction d,ID\

Nominal width of slot in bar s ieve

M a s s rr)\ pass ing bar s ieve

Fl,

mm 9 m m 9 = (m,IR,) x 100

80/100

63/80

50/63

40/50

31,5/40

25/31,5

50

40

31,5

25

20

16

20/25 12,5

16/20

12,5/16

10/12,5

8/10

6,3/8

5/6.3

4/5

10

8

6,3

5

4

3,15

2,5

My = 1R, = M2 = X/ttj =

FI={M2/My)x 100 =

1 nn M0 { I ^ i + X (discarded m a s s e s ) + X (not tested fraction m a s s e s ) } < 1 % i UU X 1

MQ

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E N 933-3:2012 (E)

Annex B (informative)

Precisio IO

The results of a c ross testing experiment carried out by 2 0 laboratories in 1 9 9 4 , a s part of a project (Project 1 3 4 ) funded by the European Communi ty under the Measuremen ts and Test ing P r o g r a m m e , are given in Tab le B . 1 . The repeatabil ity r: and reproducibil ity /? i va lues have been determined for the three tested aggregates on the basis of test results obtained from dupl icate test port ions prepared by each laboratory from their laboratory samp le and subsequent ly tested.

Table B.1 — Repeatability and reproducibility values for determinations of flakiness indexes (% by mass of flaky particles) of coarse aggregates

Target Fl va lue :

Item Symbo l Leve l 1 Level 2 Leve l 3

1 0 3 0 5 0

Upper s ieve s ize D (mm): 2 0 1 4 1 0

Number of laboratories included N 1 8 1 ) 1 8 1 ) 1 8 1 )

Average Fl va lue X 8 , 8 2 9 , 2 51 ,1

Repeatabi l i ty standard deviation S H 0 , 6 8 1 ,37 0 , 8 0

Reproducibi l i ty standard deviation SRI 1 ,03 2 , 9 4 4 , 1 3

Repeatabi l i ty limit 1,9 3 ,8 2 ,2

Reproducibi l i ty limit *1 2 ,9 8 ,2 1 1 , 6 1 ) The results of 1 8 laboratories out of 2 0 were accepted for precis ion data calculat ions.

For other aggregate s i zes or other levels of f lakiness indexes, the repeatabil i ty and reproducibi l i ty va lues c a n be calculated using the following formulas:

/ v In (wo-FI) H (% by m a s s ) = 0 , 0 0 2 8 J — * — — -

where

D is the aggregate s ize (mm),

M is the m a s s of test portion (kg)

/?, (% by m a s s ) = 0 , 9 5 + 0 , 2 2 6 F l

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