SIST EN 933-4:2008

Tests for geometrical properties of aggregates - Part 4: Determination of particle shape - Shape index

This standard describes the reference method used for type testing in cases of dispute, for the determination of the shape index of coarse aggregates. For other purposes, in particular factory production control, other methods may be used provided an appropriate working relationship with the reference method has been established.
The test method specified in this European Standard is applicable to particle size fractions di/Di where Di ≤ 63 mm and di ≥ 4 mm.

Prüfverfahren für geometrische Eigenschaften von Gesteinskörnungen - Teil 4: Bestimmung der Kornform - Kornformkennzahl

Diese Norm beschreibt das Referenzverfahren für die Erstprüfung und in Streitfällen für die Bestimmung der Kornformkennzahl von groben Gesteinskörnungen. Für andere Zwecke, speziell im Rahmen der werkseigenen Produktionskontrolle, dürfen andere Verfahren angewendet werden, sofern ein ausreichender Zusammenhang mit dem Referenzverfahren nachgewiesen wurde.
Das in dieser Europäischen Norm festgelegte Prüfverfahren ist für Kornklassen di/Di mit Di  63 mm und di  4 mm anwendbar.

Essais pour déterminer les caractéristiques géométriques des granulats - Partie 4: Détermination de la forme des granulats - Indice de forme

La présente norme décrit la méthode de référence utilisée pour les essais de type et, en cas de conflit, pour la détermination de l’indice de forme des gravillons. Pour d'autres objectifs, en particulier dans le cadre du contrôle de la production en usine, d'autres méthodes peuvent être employées si une corrélation appropriée avec la méthode de référence a été établie.
La méthode d'essai spécifiée dans la présente Norme européenne s'applique à la fraction granulaire di/Di où Di = 63 mm et di = 4 mm.

Preskusi geometričnih lastnosti agregatov - 4. del: Določevanje oblike zrn - Modul oblike

General Information

• Status: Published
• Publication Date: 11-Aug-2008
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: AGR - Aggregates
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jul-2008
• Due Date: 14-Sep-2008
• Completion Date: 12-Aug-2008
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/124 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on road construction products
• Mandate: M/125 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on aggregates
• Ref Project: EN 933-4:2008 - Tests for geometrical properties of aggregates - Part 4: Determination of particle shape - Shape index

Relations

• Replaces: SIST EN 933-4:2000 - Tests for geometrical properties of aggregates - Part 4: Determination of particle shape - Shape index
• Effective Date: 01-Sep-2008

Overview

EN 933-4:2008 (CEN) defines the reference laboratory method for determining the shape index of coarse aggregates. The standard is intended primarily for type testing and resolution of disputes; alternative methods may be used for factory production control provided an appropriate working relationship with the reference method is established. The method applies to particle size fractions di/Di where Di ≤ 63 mm and di ≥ 4 mm.

The shape index (SI) is expressed as the mass percentage of particles classified as non-cubical - those with a length-to-thickness ratio (L/E) greater than 3 - relative to the total dry mass of the test portion.

Key Topics

• Principle: Individual particles are measured (or assessed) for length (L) and thickness (E). Particles with L/E > 3 are classified as non-cubical. SI = (mass of non-cubical particles ÷ total test portion mass) × 100.
• Apparatus: Includes test sieves (EN 933-2), particle slide gauge (example provided), ventilated oven (110 ± 5 °C) for drying, balances readable to 0.1% of the mass, trays and sieving equipment (EN 932-5 for general requirements).
• Sample preparation: Reduce and dry the sample to constant mass per EN 932-2; sieve to produce the particle size fractions to be tested; discard oversize (>63 mm) and undersize (<4 mm) as applicable.
• Test portion mass (minimum values): guidance in EN 933-4 provides minimum test portion masses for typical upper aggregate sizes, for example:
  • D = 63 mm → minimum test portion mass 45 kg
  • D = 32 mm → 6 kg
  • D = 16 mm → 1 kg
  • D = 8 mm → 0,1 kg (Adjustments are specified for aggregates with atypical particle density.)
• Procedure: Test each applicable size fraction (Di ≤ 2·di). For large or reduced size fractions, calculate weighted means using mass percentages of size fractions when required.
• Reporting: The test report must reference EN 933-4:2008, identify the laboratory and sample, list particle size fractions tested, and give the shape index (SI) rounded to the nearest whole number.

Applications

• Provides a benchmark reference method for type testing and legal or commercial dispute resolution involving aggregate shape.
• Supports quality control (QC) and conformity assessment when factory methods are correlated to the reference method.
• Useful for specifiers and suppliers of aggregates for concrete, asphalt and other construction uses where particle shape affects workability and mechanical performance.
• Helps identify and quantify the proportion of elongated or flaky particles (non-cubical) in coarse aggregate lots.

Related Standards

• EN 933 series (other parts): EN 933-1, EN 933-2, EN 933-3, EN 933-5 to EN 933-10
• EN 932-2, EN 932-5 (sample reduction and general equipment requirements)
• EN 1097-6 (particle density and water absorption)

For laboratories and procurement teams, EN 933-4:2008 is a key reference for consistent measurement of particle shape and for establishing traceable relationships between production control methods and the reference procedure.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2008
1DGRPHãþD
SIST EN 933-4:2000
3UHVNXVLJHRPHWULþQLKODVWQRVWLDJUHJDWRYGHO'RORþHYDQMHREOLNH]UQ0RGXO
REOLNH
Tests for geometrical properties of aggregates - Part 4: Determination of particle shape -
Shape index
Prüfverfahren für geometrische Eigenschaften von Gesteinskörnungen - Teil 4:
Bestimmung der Kornform - Kornformkennzahl
Essais pour déterminer les caractéristiques géométriques des granulats - Partie 4:
Détermination de la forme des granulats - Indice de forme
Ta slovenski standard je istoveten z: EN 933-4:2008
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 933-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2008
ICS 91.100.15 Supersedes EN 933-4:1999
English Version
Tests for geometrical properties of aggregates - Part 4:
Determination of particle shape - Shape index
Essais pour déterminer les caractéristiques géométriques Prüfverfahren für geometrische Eigenschaften von
des granulats - Partie 4: Détermination de la forme des Gesteinskörnungen - Teil 4: Bestimmung der Kornform -
granulats - Coefficient de forme Kornformkennzahl
This European Standard was approved by CEN on 4 February 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 933-4:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle.5
5 Apparatus .5
6 Preparation of test portion.6
7 Procedure .7
8 Calculation and expression of results.8
9 Test report .9
Annex A (informative) Example of a test data sheet used for determining the shape index of
coarse aggregate .11

Foreword
This document (EN 933-4:2008) 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 September 2008, and conflicting national standards shall be
withdrawn at the latest by September 2008.
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 supersedes EN 933-4:1999.
This European Standard is one of a series of standards for tests for geometrical properties of aggregates. Test
methods for other properties of aggregates are covered by Parts of 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 aggregates
EN 13179, Tests for filler aggregate used in bituminous mixtures

The other parts of EN 933 are:
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 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 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 fillers (air jet sieving)
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, 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 and the United Kingdom.
1 Scope
This standard describes the reference method used for type testing and in cases of dispute, for the
determination of the shape index of coarse aggregates. For other purposes, in particular factory production
control, other methods may be used provided an appropriate working relationship with the reference method has
been established.
The test method specified in this European Standard is applicable to particle size fractions d/D where D
i i i
≤ 63 mm and d ≥ 4 mm.
i
2 Normative references
The following referenced documents are indispensable for the application 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, Test 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 933-1, Tests for geometrical properties of aggregates - Part 1: Determination of particle size distribution -
Sieving method
EN 933-2, Tests for geometrical properties of aggregates - Part 2: Determination of particle size distribution -
Test sieves, nominal size of apertures
EN 1097-6, Tests for mechanical and physical properties of aggregates - Part 6: Determination of the particle
density and water absorption
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
aggregate size
designation of aggregate in terms of lower (d) and upper (D) sieve sizes, expressed as d/D
NOTE 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
particle size fraction d /D
i i
fraction of an aggregate passing the larger (D ) of two sieves and retained on th
...