Tests for geometrical properties of aggregates - Part 6: Assessment of surface characteristics - Flow coefficient of aggregates

This document specifies the reference method used for type testing, and in case of dispute, for determining the flow coefficient of coarse and fine aggregates. Other methods can be used for other purposes, such as factory production control, provided that an appropriate working relationship with the reference method has been established. Examples of advanced test methods can be found in the Bibliography.
This document applies to coarse aggregate of sizes between 4 mm and 20 mm and to fine aggregate of size up to 2 mm. It does not apply to lightweight aggregates.
NOTE 1   For coarse aggregates between 4 mm and 20 mm, the flow coefficient is linked with the percentage of crushed or broken surfaces of an aggregate and can therefore be used in association with the method specified in EN 933-5. Shape and surface texture characteristics also influence the result.
NOTE 2   Experience of this test has been generally limited to natural aggregates.
Examples of test data sheets are given in informative Annexes A and C.
Annex B (informative) contains precision data.
WARNING - The use of this part of EN 933 can involve hazardous materials, operations and equipment (such as dust, noise and heavy lifts). It does not purport to address all of the safety or environmental problems associated with its use. It is the responsibility of users of this document to take appropriate measures to ensure the safety and health of personnel and the environment prior to application of the standard, and fulfil statutory and regulatory requirements for this purpose.

Prüfverfahren für geometrische Eigenschaften von Gesteinskörnungen - Teil 6: Beurteilung der Oberflächeneigenschaften - Fließkoeffizienten von Gesteinskörnungen

Dieses Dokument legt das Referenzverfahren fest, das für die Erstprüfung und im Streitfall für die Bestimmung des Fließkoeffizienten von groben und feinen Gesteinskörnungen angewendet wird. Für andere Zwecke, speziell im Rahmen der werkseigenen Produktionskontrolle, können andere Verfahren angewendet werden, sofern ein ausreichender Zusammenhang mit dem Referenzverfahren nachgewiesen wurde. Beispiele für andere Prüfverfahren können in den Literaturhinweisen gefunden werden.
Das vorliegende Dokument ist anzuwenden für grobe Gesteinskörnungen mit Korngrößen zwischen 4 mm und 20 mm und feine Gesteinskörnungen mit Korngrößen bis zu 2 mm. Es ist nicht anzuwenden für leichte Gesteinskörnungen.
ANMERKUNG 1   Bei groben Gesteinskörnungen zwischen 4 mm und 20 mm hängt der Fließkoeffizient mit dem Prozentsatz an gebrochenen Körnern einer Gesteinskörnung zusammen und kann daher in Verbindung mit dem in EN 933-5 angegebenen Verfahren angewendet werden. Das Ergebnis wird auch durch die Form und die Oberflächenbeschaffenheit beeinflusst.
ANMERKUNG 2   Erfahrungen mit diesem Prüfverfahren sind allgemein auf natürliche Gesteinskörnungen begrenzt.
Beispiele für Prüf-Datenblätter sind im informativen Anhang A und im informativen Anhang C enthalten.
Anhang B (informativ) enthält Daten zur Präzision.
WARNUNG - Die Durchführung der in diesem Teil von EN 933 beschriebenen Referenzverfahren kann gefährliche Materialien, Verfahrensschritte oder Gerätschaften (wie Staub, Lärm und Hebezeuge) umfassen. Dieses Dokument erhebt nicht den Anspruch, auf alle Sicherheits- oder Umweltprobleme hinzuweisen, die mit seiner Anwendung verbunden sind. Es liegt in der Verant¬wortung des Anwenders dieses Dokuments, vor der Anwendung geeignete Maßnahmen für die Sicherheit und den Gesundheitsschutz des Personals sowie für den Umweltschutz zu ergreifen und dafür Sorge zu tragen, dass behördliche und gesetzliche Maßnahmen eingehalten werden.

Essais pour déterminer les caractéristiques géométriques des granulats - Partie 6 : Evaluation des caractéristiques de surface - Coefficient d'écoulement des granulats

Le présent document décrit la méthode de référence servant aux essais de type et, en cas de litige, pour la détermination du coefficient d’écoulement des gravillons et des sables. D’autres méthodes peuvent être utilisées pour d’autres besoins, tels que la maitrise de la production des granulats, sous réserve qu’une corrélation appropriée avec la méthode de référence ait été établie. Des exemples de méthodes d’essais avancés se trouvent éventuellement dans la Bibliographie.
Le présent document s’applique aux gravillons de classe granulaire comprise entre 4 mm et 20 mm et des sables de classe granulaire inférieure ou égale à 2 mm. Il ne s’applique pas aux granulats légers.
NOTE 1   Pour les gravillons compris entre 4 mm et 20 mm, le coefficient d’écoulement est lié au pourcentage de surfaces cassées de granulat et peut donc être utilisé pour remplacer la méthode spécifiée dans l’EN 933-5. Les caractéristiques de forme et de texture de surface influent également sur le résultat.
NOTE 2   L'application de cette norme a généralement été limitée aux granulats naturels.
Des exemples de fiches d'essais sont donnés dans les annexes informatives A et C.
L'annexe B (informative) contient des données de fidélité.
AVERTISSEMENT - L'utilisation de cette partie de l'EN 933 peut impliquer des matériaux, des opérations et des équipements dangereux (tels que la poussière, le bruit et les ascenseurs lourds). Elle ne prétend pas traiter de tous les problèmes de sécurité ou d'environnement liés à son utilisation. Il est de la responsabilité des utilisateurs de ce document de prendre les mesures appropriées pour assurer la sécurité et la santé du personnel et de l'environnement avant l'application de la norme, et de satisfaire aux exigences légales et réglementaires à cet effet.

Preskusi geometričnih lastnosti agregatov - 6. del: Ocenjevanje značilnosti površine - Količnik sipkosti agregatov

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Status
Published
Publication Date
20-Dec-2022
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
21-Dec-2022
Due Date
30-Sep-2022
Completion Date
21-Dec-2022

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SLOVENSKI STANDARD
oSIST prEN 933-6:2021
01-januar-2021
Preskusi geometričnih lastnosti agregatov - 6. del: Ocenjevanje značilnosti
površine - Količnik sipkosti agregatov
Tests for geometrical properties of aggregates - Part 6: Assessment of surface
characteristics - Flow coefficient of aggregates
Prüfverfahren für geometrische Eigenschaften von Gesteinskörnungen - Teil 6:

Beurteilung der Oberflächeneigenschaften - Fließkoeffizienten von Gesteinskörnungen

Essais pour déterminer les caractéristiques géométriques des granulats - Partie 6:

Evaluation des caractéristiques de surface - Coefficient d'écoulement des granulats

Ta slovenski standard je istoveten z: prEN 933-6
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
oSIST prEN 933-6:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 933-6:2021
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oSIST prEN 933-6:2021
DRAFT
EUROPEAN STANDARD
prEN 933-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 91.100.15 Will supersede EN 933-6:2014
English Version
Tests for geometrical properties of aggregates - Part 6:
Assessment of surface characteristics - Flow coefficient of
aggregates

Essais pour déterminer les caractéristiques Prüfverfahren für geometrische Eigenschaften von

géométriques des granulats - Partie 6: Evaluation des Gesteinskörnungen - Teil 6: Beurteilung der

caractéristiques de surface - Coefficient d'écoulement Oberflächeneigenschaften - Fließkoeffizienten von

des granulats Gesteinskörnungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 154.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 933-6:2020 E

worldwide for CEN national Members.
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oSIST prEN 933-6:2021
prEN 933-6:2020 (E)
Contents Page

European foreword ......................................................................................................................................... 3

1 Scope ....................................................................................................................................................... 4

2 Normative references ....................................................................................................................... 4

3 Terms and definitions ...................................................................................................................... 4

4 Principle ................................................................................................................................................ 5

5 Reference materials .......................................................................................................................... 5

5.1 Coarse aggregate material .............................................................................................................. 5

5.2 Fine aggregate material ................................................................................................................... 6

6 Apparatus ............................................................................................................................................. 6

6.1 General................................................................................................................................................... 6

6.2 Apparatus for general purposes ................................................................................................... 6

6.3 Additional apparatus required for the determination of the flow coefficient of

coarse aggregate ................................................................................................................................ 6

6.4 Additional apparatus required for the determination of the flow coefficient of fine

aggregate ............................................................................................................................................... 8

7 Determination of the flow coefficient of coarse aggregate .............................................. 10

7.1 General................................................................................................................................................ 10

7.2 Preparation of test portions ....................................................................................................... 10

7.3 Procedure .......................................................................................................................................... 11

7.4 Calculation and expression of results ..................................................................................... 12

7.5 Test report ......................................................................................................................................... 13

8 Determination of the flow coefficient of fine aggregate ................................................... 13

8.1 General................................................................................................................................................ 13

8.2 Preparation of test portions ....................................................................................................... 13

8.3 Procedure .......................................................................................................................................... 14

8.4 Calculation and expression of results ..................................................................................... 15

8.5 Test report ......................................................................................................................................... 15

Annex A (informative) Example of test data sheet – coarse aggregate .................................... 16

Annex B (informative) Precision ............................................................................................................ 17

Annex C (informative) Example of test data sheet – fine aggregate ......................................... 18

Bibliography ................................................................................................................................................... 19

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prEN 933-6:2020 (E)
European foreword

This document (prEN 933-6:2020) has been prepared by the Technical Committee CEN/TC 154

“Aggregates”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 933-6:2014.

In comparison with the previous edition, the following technical modifications have been made:

a) amendment to 6.4.1, including Figure 3, to clarify the verification of aperture dimension;

b) amendment to the expressions of numerical results in 8.3, 8.4 and Annex C, for a better precision of

the final result;
c) updating of the test reports in 7.5 and 8.5 according to the current rules.

This document forms part of a series of tests for geometrical properties of aggregates. Test methods for

other properties of aggregates are covered by the following European Standards:
— EN 932 (all parts), Tests for general properties of aggregates

— EN 1097 (all parts), Tests for mechanical and physical properties of aggregates

— EN 1367 (all parts), Tests for thermal and weathering properties of aggregates
— EN 1744 (all parts), Tests for chemical properties of aggregates
— EN 13179 (all parts), Tests for filler aggregate used in bituminous mixtures
The other parts of EN 933 include:
— 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 particles in coarse and all-in natural aggregates

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

— Part 8: Assessment of fines — Sand equivalent test
— Part 9: Assessment of fines — Methylene blue test
— Part 10: Assessment of fines — Grading of filler aggregates (air jet sieving)
— Part 11: Classification test for the constituents of coarse recycled aggregate
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1 Scope

This document specifies the reference method used for type testing, and in case of dispute, for

determining the flow coefficient of coarse and fine aggregates. Other methods can be used for other

purposes, such as factory production control, provided that an appropriate working relationship with

the reference method has been established. Examples of advanced test methods can be found in the

Bibliography.

This document applies to coarse aggregate of sizes between 4 mm and 20 mm and to fine aggregate of

size up to 2 mm.

NOTE 1 For coarse aggregates between 4 mm and 20 mm, the flow coefficient is linked with the percentage of

crushed or broken surfaces of an aggregate and can therefore be used in association with the method specified in

EN 933–5. Shape and surface texture characteristics also influence the result.
NOTE 2 Experience of this test has been generally limited to natural aggregates.
Examples of test data sheets are given in informative Annexes A and C.
Annex B (informative) contains precision data.

WARNING – The use of this part of EN 933 can involve hazardous materials, operations and equipment

(such as dust, noise and heavy lifts). It does not purport to address all of the safety or environmental

problems associated with its use. It is the responsibility of users of this document to take appropriate

measures to ensure the safety and health of personnel and the environment prior to application of the

standard, and fulfil statutory and regulatory requirements for this purpose.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. 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 general properties of aggregates - Part 2: Methods for reducing laboratory samples

EN 932-5, Tests for general properties of aggregates - Part 5: Common equipment and calibration

EN 933-2, Tests for geometrical properties of aggregates - Part 2: Determination of particle size

distribution - Test sieves, nominal size of apertures

EN 933-3, Tests for geometrical properties of aggregates - Part 3: Determination of particle shape -

Flakiness index

EN 1097-6:2013, Tests for mechanical and physical properties of aggregates - Part 6: Determination of

particle density and water absorption
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
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prEN 933-6:2020 (E)
3.1
aggregate size

designation of aggregate in terms of lower (d) and upper (D) sieve sizes expressed in terms as d/D

Note 1 to entry: This designation accepts the presence of some particles which will be retained on the upper

sieve (oversize) and some which will pass the lower sieve (undersize).
3.2
constant mass

mass determined by successive 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 pre-

determined period in a specified oven 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.

3.3
laboratory sample
sample intended for laboratory testing
3.4
particle size fraction
d /D
i i

fraction of an aggregate passing the larger (D ) of two sieves and retained on the smaller (d )

i i
3.5
test portion
sample used as a whole in a single test
4 Principle

The flow coefficient of an aggregate is the time, expressed in seconds, for a specified volume of aggregate

to flow through a given opening, under specified conditions using a standard apparatus.

5 Reference materials
5.1 Coarse aggregate material

A 6,3/10 mm reference aggregate with a flow time of (100 ± 2) s when the shutter has an opening of

(42,0 ± 0,2) mm.

In the various calculations, the flow time E of this reference coarse aggregate shall be taken as equal to

100 s and its pre-dried particle density ρ shall be taken as equal to 2,70 Mg/m .

NOTE At present, the only recognized source of reference aggregate is a stock of quartzite aggregate

controlled by the CEREMA, Direction territoriale Normandie Centre, Laboratoire Régional de Rouen, 10 chemin de

la Poudrière, CS 90245, 76121 Le Grand-Quevilly cedex, France. {Telephone: + (33) 2 35 68 81 00 – Fax: + (33) 2

35 68 81 72 – e-mail: LRR.DTerNC@cerema.fr}

An alternative source of reference coarse aggregate can be used provided that the flow coefficient of

that aggregate is established in a controlled experiment carried out in at least 10 laboratories, by cross

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testing against the LRPC reference coarse aggregate. In this case, the flow time E and the pre-dried

particle density ρ of this alternative reference coarse aggregate should be used. In case of dispute, the

LRPC reference coarse aggregate should be used.
5.2 Fine aggregate material
A 0,063/2 mm reference aggregate with a flow time of (32 ± 2) s.

In the various calculations, the flow time E of this reference fine aggregate shall be taken as equal to

32 s and its pre-dried particle density shall be taken as equal to 2,70 Mg/m .

NOTE At present the only recognized source of reference aggregate is a siliceous Somme bay fine aggregate

controlled by the CEREMA, Direction territoriale Normandie Centre, Laboratoire Régional de Rouen, 10 chemin de

la Poudrière, CS 90245, 76121 Le Grand-Quevilly cedex, France. {Telephone: + (33) 2 35 68 81 00 – Fax: + (33) 2

35 68 81 72 – e-mail: LRR.DTerNC@cerema.fr}

An alternative source of reference fine aggregate can be used provided that the flow coefficient of that

aggregate is established in a controlled experiment carried out in at least 10 laboratories, by cross

and the pre-dried

testing against the LRPC reference fine aggregate. In this case, the flow time ERS

particle density ρ of this alternative reference fine aggregate should be used. In case of dispute, the

LRPC reference fine aggregate should be used.
6 Apparatus
6.1 General

All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5.

6.2 Apparatus for general purposes

6.2.1 Test sieves, 0,063 mm, 2 mm, 4 mm, 6,3 mm, 8 mm, 10 mm, 14 mm and 20 mm, with apertures

as specified in EN 933-2.

6.2.2 Ventilated oven, thermostatically controlled to maintain a temperature of (110 ± 5) °C or

equipment for drying the aggregate which does not cause any particle size breakdown.

6.2.3 Balance, accurate to 0,1 % of the mass to be weighed.
6.2.4 Stopwatch or stopclock, to read 0,1 s.

6.3 Additional apparatus required for the determination of the flow coefficient of

coarse aggregate
6.3.1 Bar sieves, conforming to EN 933-3, with apertures of 4 mm and 5 mm.
6.3.2 Container, of volume approximately 10 l.
6.3.3 Vibratory table, (Figure 1) comprising the following parts:

6.3.3.1 Bubble level, incorporated in the upper platform of the table and capable of setting in a

horizontal position.

6.3.3.2 Four rubber suspensions, of shore hardness (160 ± 30) N/mm joining the upper platform of

the table to the support frame.
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6.3.3.3 Vibrator, using unbalanced weights, fixed under the platform; with its axis of rotation

horizontal and perpendicular to the axis of the flow channel. The speed of rotation shall be

(2970 ± 20) revolutions/min and the amplitude (0,18 ± 0,02) mm when the flow unit is empty.

6.3.3.4 Baseplate, of mass (100 ± 10) kg, fixed under the frame.
Dimensions in millimetres
Key

1 vibratory platform 5 tube for test portion (see 6.3.4.1 and detail in Figure 2)

2 rubber suspension (see 6.3.3.2) 6 flow channel (see detail in Figure 2)
3 vibrator (see 6.3.3.3)
4 baseplate (see 6.3.3.4)
Figure 1 — Vibratory table and flow unit for coarse aggregate

6.3.4 Flow unit, of total mass (42,3 ± 0,1) kg (Figure 2) comprising the following:

6.3.4.1 Plastic tube for test portion, inside diameter (125 ± 2) mm and height (610 ± 10) mm.

6.3.4.2 Metal shutter, to adjust the height of the opening between (40 ± 1) mm and (60 ± 1) mm.

NOTE The height of the opening can be checked by using metal gauge block of a given height ± 0,1 mm.

6.3.4.3 Metal movable flap, to release the flow of material.

6.3.4.4 Metal flow channel, with a slope of (10,0 ± 0,5)°, a width of (90 ± 1) mm and fitted with plastic

...

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