SIST EN 932-3:2022

Tests for general properties of aggregates - Part 3: Procedure and terminology for simplified petrographic description

This document specifies a basic procedure for the identification of the petrographic type of natural aggregates. Precise petrographic identification, of technical mineralogy and petrography for civil engineering or specific end uses, requires further examination and is therefore excluded from the scope of this document.
NOTE 1   A qualified geologist (petrographer), with experience of materials used in civil engineering and aware of the composition of the deposit, has sufficient skills to sample and name the rock.
NOTE 2   For precise petrographic identification, a non-exhaustive list of reference literature is given in the Bibliography.
This document covers only natural aggregates. It is used to describe massive rocks and unconsolidated rocks.
Annex A provides guidance on the petrographic nomenclature by giving definitions of simple petrographic terms applicable to rock types used for aggregates.

Prüfverfahren für allgemeine Eigenschaften von Gesteinskörnungen - Teil 3: Durchführung und Terminologie einer vereinfachten petrographischen Beschreibung

Dieses Dokument legt ein grundlegendes Verfahren zur Bestimmung des petrographischen Typs von natürlichen Gesteinskörnungen fest. Die genaue petrographische Bestimmung der technischen Mineralogie und Petrographie für das Bauwesen oder sonstige spezifische Endanwendungen erfordert weitere Untersuchungen und ist daher vom Anwendungsbereich dieses Dokuments ausgeschlossen.
ANMERKUNG 1   Ein qualifizierter Geologe (Petrograph), der Erfahrung mit den im Bauwesen verwendeten Werkstoffen hat und die Zusammensetzung der Lagerstätte kennt, verfügt über ausreichende Fähigkeiten, um Proben zu nehmen und das Gestein zu benennen.
ANMERKUNG 2   Zur genauen petrographischen Bestimmung ist in den Literaturhinweisen eine Liste von Referenzliteratur angegeben, für die kein Anspruch auf Vollständigkeit besteht.
Dieses Dokument behandelt nur natürliche Gesteinskörnungen. Es wird zur Beschreibung von massigem und unverfestigtem Gestein verwendet.
Anhang A bietet eine Orientierungshilfe zur petrographischen Nomenklatur. Es werden einfache petrographische Begriffe definiert, die für in Gesteinskörnungen verwendete Gesteinsarten gelten.

Essais pour déterminer les propriétés générales des granulats - Partie 3 : Procédure et terminologie pour la description pétrographique simplifiée

Le présent document spécifie une procédure de base pour l’identification du type pétrographique des granulats d’origine naturelle. L’identification pétrographique précise, de la minéralogie technique et de la pétrographie pour le génie civil ou pour des applications spécifiques, nécessite un examen plus approfondi et est par conséquent exclue du domaine d’application du présent document.
NOTE 1   Un géologue (pétrographe) qualifié ayant l’expérience des matériaux utilisés en génie civil et connaissant la composition du gisement possède les compétences nécessaires pour échantillonner et désigner la roche.
NOTE 2   Pour une identification pétrographique précise, une liste non exhaustive de références bibliographiques est donnée dans la Bibliographie.
Le présent document couvre uniquement les granulats d’origine naturelle. Il est utilisé pour décrire les roches massives et les roches meubles.
L’Annexe A fournit des indications sur la nomenclature pétrographique en donnant les définitions de termes pétrographiques simples applicables aux types de roches utilisés dans les granulats.

Preskusi splošnih lastnosti agregatov - 3. del: Postopek in izrazje poenostavljenega petrografskega opisa

Ta dokument določa osnovni postopek za določanje petrografskega tipa naravnih agregatov. Za natančno petrografsko določanje, tehnično mineralogijo in petrografijo za gradbeništvo ali posebne končne načine uporabe so potrebne dodatne preiskave, zato navedeno ni vključeno v ta dokument.
OPOMBA 1:   Za vzorčenje in poimenovanje kamnine je zadostno usposobljen kvalificirani geolog (petrograf) z izkušnjami z materiali, ki se uporabljajo v gradbeništvu, in poznavanjem sestave nahajališča.
OPOMBA 2:   Za natančno petrografsko opredelitev je v razdelku Literatura podan neizčrpen seznam referenčne literature.
V tem dokumentu so obravnavani samo naravni agregati. Uporablja se za opis masivnih in nekonsolidiranih kamnin.
Dodatek A vsebuje smernice za petrografsko poimenovanje z opredelitvami preprostih petrografskih izrazov, ki se uporabljajo za vrste kamnin v agregatih.

General Information

• Status: Published
• Public Enquiry End Date: 09-Nov-2020
• Publication Date: 21-Aug-2022
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: AGR - Aggregates
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Aug-2022
• Due Date: 10-Oct-2022
• Completion Date: 22-Aug-2022
• Ref Project: EN 932-3:2022 - Tests for general properties of aggregates - Part 3: Procedure and terminology for simplified petrographic description

RELATIONS

• Replaces: SIST EN 932-3:1999 - Tests for general properties of aggregates - Part 3: Procedure and terminology for simplified petrographic description
• Effective Date: 01-Sep-2022
• Replaces: SIST EN 932-3:1999/A1:2004 - Tests for general properties of aggregates - Part 3: Procedure and terminology for simplified petrographic description
• Effective Date: 01-Sep-2022

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 932-3:2022
01-september-2022
Nadomešča:
SIST EN 932-3:1999
SIST EN 932-3:1999/A1:2004
Preskusi splošnih lastnosti agregatov - 3. del: Postopek in izrazje
poenostavljenega petrografskega opisa

Tests for general properties of aggregates - Part 3: Procedure and terminology for

simplified petrographic description
Prüfverfahren für allgemeine Eigenschaften von Gesteinskörnungen - Teil 3:
Durchführung und Terminologie einer vereinfachten petrographischen Beschreibung

Essais pour déterminer les propriétés générales des granulats - Partie 3 : Procédure et

terminologie pour la description pétrographique simplifiée
Ta slovenski standard je istoveten z: EN 932-3:2022
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
SIST EN 932-3:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 932-3:2022
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SIST EN 932-3:2022
EN 932-3
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 91.100.15 Supersedes EN 932-3:1996
English Version
Tests for general properties of aggregates - Part 3:
Procedure and terminology for simplified petrographic
description

Essais pour déterminer les propriétés générales des Prüfverfahren für allgemeine Eigenschaften von

granulats - Partie 3 : Procédure et terminologie pour la Gesteinskörnungen - Teil 3: Durchführung und

description pétrographique simplifiée Terminologie einer vereinfachten petrographischen

Beschreibung
This European Standard was approved by CEN on 20 April 2022.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 932-3:2022 E

worldwide for CEN national Members.
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SIST EN 932-3:2022
EN 932-3:2022 (E)
Contents Page

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

1 Scope ........................................................................................................................................................... 5

2 Normative references ........................................................................................................................... 5

3 Terms and definitions........................................................................................................................... 5

4 Reagent and apparatus ......................................................................................................................... 6

5 Sampling and preparation of test portion ..................................................................................... 7

5.1 General .................................................................................................................................................... 7

5.2 Rock sample .......................................................................................................................................... 7

5.3 Aggregates ............................................................................................................................................. 7

6 Test procedure ........................................................................................................................................ 7

6.1 Description of a rock sample .......................................................................................................... 7

6.2 Description of an aggregate test portion .................................................................................... 8

7 Test report ................................................................................................................................................ 9

7.1 Required data ....................................................................................................................................... 9

7.2 Optional data ........................................................................................................................................ 9

Annex A (informative) Nomenclature ....................................................................................................... 11

A.1 General .................................................................................................................................................... 11

A.2 Igneous rocks ........................................................................................................................................ 11

A.3 Sedimentary materials ...................................................................................................................... 14

A.4 Metamorphic rocks ............................................................................................................................. 16

A.5 Mineral ore ............................................................................................................................................ 17

Bibliography ........................................................................................................................................................ 18

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SIST EN 932-3:2022
EN 932-3:2022 (E)
European foreword

This document (EN 932-3:2022) 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 December 2022, and conflicting national standards shall

be withdrawn at the latest by December 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 932-3:1996.

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

a) The Scope has been revised to emphasize that the method only applies for simplified (not precise)

petrographic description of natural aggregates, and that it does not apply to manufactured or

recycled aggregates. The Scope, and the whole standard, now uses the term petrographic type, which

is used in the product standards. Note 1 has been reworded to show the role of the petrographer,

without normative wording. Presentation of Annex A has been included;
b) The Foreword and Normative references have been updated;

c) Clauses 3 Terms and definitions and 4 Reagent and apparatus have been extended;

d) Clauses 5 Sampling, 6 Description of a rock sample and 7 Description of an aggregate sample, have

been revised. They have been clarified, restructured and renamed to 5 Sampling and preparation of

test portion and 6 Test procedure, which is further divided into examination, description and

designation;
e) Test report has been revised and adapted to the current rules;

f) Annex A has been updated, restructured and extended with three illustrating figures;

g) The Bibliography has been updated and extended.

This document forms part of a series of standards for general properties of aggregates. Test methods for

other properties of aggregates are covered by the following European Standards:
— EN 933 (all parts), Tests for geometrical 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
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SIST EN 932-3:2022
EN 932-3:2022 (E)
The other parts of EN 932 include:
— Part 1: Methods for sampling
— Part 2: Methods for reducing laboratory samples
— Part 5: Common equipment and calibration
— Part 6: Definitions of repeatability and reproducibility

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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 the United

Kingdom.
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SIST EN 932-3:2022
EN 932-3:2022 (E)
1 Scope

This document specifies a basic procedure for the identification of the petrographic type of natural

aggregates. It applies for usual requirements for the procedure and terminology for simplified

petrographic description. Precise petrographic identification, of technical mineralogy and petrography

for civil engineering or specific end uses, requires further examination and is therefore excluded from the

scope of this document.

NOTE 1 In principle, a qualified geologist (petrographer), with experience of materials used in civil engineering

and aware of the composition of the deposit, has sufficient skills to sample and name the rock.

NOTE 2 For precise petrographic identification and technical requirements for specific applications, a non-

exhaustive list of reference literature is given in the Bibliography.

This document applies only to natural aggregates. It is used to describe rocks and sediments. It does not

apply to the description and identification of manufactured or recycled aggregates.

Informative Annex A provides guidance on the petrographic nomenclature by giving definitions of simple

petrographic terms applicable to rock types used for aggregates.
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 932-1, Tests for general properties of aggregates - Part 1: Methods for sampling

EN 932-2, Tests for general properties of aggregates - Part 2: Methods for reducing laboratory samples

EN 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.

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

— ISO Online browsing platform: available at https://www.iso.org/obp/ui
— IEC Electropedia: available at https://www.electropedia.org/
3.1
rocks
3.1.1
rock
natural solid substance composed of crystals or minerals

Note 1 to entry: The term also includes the relatively rare natural glasses. Rocks are classified into three categories

according to their origin: igneous, sedimentary and metamorphic.
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SIST EN 932-3:2022
EN 932-3:2022 (E)
3.1.2
igneous rock

rock crystallized from molten rock (magma) either at or below the earth's surface, with a nomenclature

which is based on the mineralogical composition

Note 1 to entry: Rocks formed below the earth’s surface can be divided into two classes, plutonic and hypabyssal.

Plutonic rocks are formed at depth in large bodies and typically have a coarse crystalline texture, with crystals

clearly visible to the naked eye. Hypabyssal rocks are formed in smaller bodies near, but not at, the earth's surface

and have usually a fine crystalline texture.

Note 2 to entry: Extrusive or volcanic rocks are formed as lavas and pyroclastics at the earth's surface and have a

very fine or glassy texture.
3.1.3
sedimentary rock

rock formed by solidification of sedimentary deposits, trough diagenesis and lithification

Note 1 to entry: Generally, sedimentary rocks are stratified and they are classified into the same categories as

sediment. Both sedimentary rocks and sediments form the sedimentary materials.
3.1.4
metamorphic rock

rock transformed from a pre-existing rock by fluids or heat (contact metamorphism) and pressure in the

earth's crust (burial metamorphism)

Note 1 to entry: Metamorphism changes the mineral content and composition and the microstructure of the pre-

existing rock, dominantly by solid state chemical reactions. Metamorphism is often associated with tectonic

processes and therefore, metamorphic rocks frequently have anisotropic textures.
3.2
sediment
natural deposit composed of unsolidified fragments of rocks or minerals

Note 1 to entry: Sediments are classified into three categories according to their origin: clastic or detrital, chemical

and biogenic. Clastic sediments are products of mechanical weathering (e.g. sand or gravel), chemical sediments are

products of chemical weathering (e.g. kaolin clay) and biogenic sediments are products of organisms (fossils,

microfossils, etc.).
3.3
laboratory sample
sample intended for laboratory testing
3.4
test portion
sample used as a whole in a single test
4 Reagent and apparatus

4.1 Test sieves, of nominal size of apertures conforming to EN 933-2, including at least the 4 mm sieve.

4.2 Hand lens.
4.3 Pen knife.
4.4 Stereoscopic microscope, with a magnification of typically 10× to 100×.
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SIST EN 932-3:2022
EN 932-3:2022 (E)
4.5 Polarizing microscope, optional.
4.6 Reagent, diluted hydrochloric acid.

NOTE Typically, limestone reacts with hydrochloric acid diluted to ~10 % and dolomite reacts with

hydrochloric acid diluted to ~20 %.
4.7 Magnet, optional.
5 Sampling and preparation of test portion
5.1 General

The laboratory sample shall be taken either from exposed faces of exploitation sites or drill cores, or from

stock piles for aggregates. In the case of aggregates, the sampling shall be carried out according to

EN 932-1.
5.2 Rock sample
The mass of the test portion for examination shall be not less than 5 kg.
5.3 Aggregates

The minimum mass of the laboratory sample depends on the aggregate size D and on the petrographic

heterogeneity of the aggregates.

Samples (laboratory sample and other samples) shall be reduced in accordance with the requirements of

EN 932-2 to produce the test portion. The size of the test portion should be representative of the material.

NOTE In the case of heterogeneous aggregates (when no single petrographic type or mineral is predominant,

the material is said to be “heterogeneous”), generally 150 particles are sufficient for the examination.

6 Test procedure
6.1 Description of a rock sample
6.1.1 Examination and description

First, examine the sample visually to determine the constituent rock or mineral types.

NOTE 1 It can be appropriate to wash the sample before examination.

Then, inspect each rock type carefully using a hand lens or a stereoscopic microscope and other

appropriate means.
Describe the sample and include the following:

a) grain size of the main constituents, texture, anisotropy, porosity, vesicularity (in volcanic rocks) and

colour;

b) main minerals that can be identified (quartz, feldspars, calcite, dolomite, etc.);

c) state of alteration and weathering.

NOTE 2 The description can also include comments on the presence, even in small quantities, of some

constituents which can be of concern in particular circumstances (suc
...

SLOVENSKI STANDARD
oSIST prEN 932-3:2020
01-november-2020
Preskusi splošnih lastnosti agregatov - 3. del: Postopek in izrazje
poenostavljenega petrografskega opisa

Tests for general properties of aggregates - Part 3: Procedure and terminology for

simplified petrographic description
Prüfverfahren für allgemeine Eigenschaften von Gesteinskörnungen - Teil 3:
Durchführung und Terminologie einer vereinfachten petrographischen Beschreibung

Essais pour déterminer les propriétés générales des granulats - Partie 3 : Procédure et

terminologie pour la description pétrographique simplifiée
Ta slovenski standard je istoveten z: prEN 932-3
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
oSIST prEN 932-3:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 932-3:2020
---------------------- Page: 2 ----------------------
oSIST prEN 932-3:2020
DRAFT
EUROPEAN STANDARD
prEN 932-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 91.100.15 Will supersede EN 932-3:1996
English Version
Tests for general properties of aggregates - Part 3:
Procedure and terminology for simplified petrographic
description

Essais pour déterminer les propriétés générales des Prüfverfahren für allgemeine Eigenschaften von

granulats - Partie 3 : Procédure et terminologie pour la Gesteinskörnungen - Teil 3: Durchführung und

description pétrographique simplifiée Terminologie einer vereinfachten petrographischen

Beschreibung

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 932-3:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 932-3:2020
prEN 932-3:2020 (E)
Contents Page

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

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

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

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

4 Reagent and apparatus ......................................................................................................................... 5

5 Laboratory sample ................................................................................................................................. 6

5.1 General ....................................................................................................................................................... 6

5.2 Massive rock sample ............................................................................................................................. 6

5.3 Unconsolidated rock sample .............................................................................................................. 6

5.4 Laboratory sample taken directly on aggregates ....................................................................... 6

6 Test procedure ........................................................................................................................................ 6

6.1 Description of a massive rock sample ............................................................................................. 6

6.1.1 Examination and description ............................................................................................................. 6

6.1.2 Designation ............................................................................................................................................... 6

6.2 Description of an aggregate sample ................................................................................................. 7

6.2.1 General ....................................................................................................................................................... 7

6.2.2 Examination and description of test portion ............................................................................... 7

6.2.3 Designation ............................................................................................................................................... 7

7 Test report ................................................................................................................................................ 8

7.1 Required data .......................................................................................................................................... 8

7.2 Optional data ............................................................................................................................................ 8

Annex A (informative) Nomenclature .......................................................................................................... 9

A.1 General ....................................................................................................................................................... 9

A.2 Igneous rocks ........................................................................................................................................... 9

A.3 Sedimentary rocks .............................................................................................................................. 12

A.4 Metamorphic rocks ............................................................................................................................. 13

A.5 Sediments or unconsolidated rocks ............................................................................................. 14

A.6 Mineral ore............................................................................................................................................. 14

Bibliography ........................................................................................................................................................ 15

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oSIST prEN 932-3:2020
prEN 932-3:2020 (E)
European foreword

This document (prEN 932-3:2020) has been prepared by 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 932-3:1996.

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

a) The Scope has been revised;

b) Clauses 3 Terms and definitions and 4 Reagent and apparatus have been extended;

c) Clauses 5, 6 and 7 have been revised with new title, structure and texts;
d) Test report has been revised;
e) Annex A has been updated;
f) The Foreword, Normative references and Bibliography have been partly updated.

This document forms part of a series of standards for general properties of aggregates. Test methods

for other properties of aggregates are covered by the following European Standards:

— EN 933 (all parts), Tests for geometrical 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 932 include:
— Part 1: Methods for sampling
— Part 2: Methods for reducing laboratory samples
— Part 5: Common equipment and calibration
— Part 6: Definitions of repeatability and reproducibility
---------------------- Page: 5 ----------------------
oSIST prEN 932-3:2020
prEN 932-3:2020 (E)
1 Scope

This document specifies a basic procedure for the identification of the petrographic type of natural

aggregates. Precise petrographic identification, of technical mineralogy and petrography for civil

engineering or specific end uses, requires further examination and is therefore excluded from the scope

of this document.

NOTE 1 A qualified geologist (petrographer), with experience of materials used in civil engineering and aware

of the composition of the deposit, has sufficient skills to sample and name the rock.

NOTE 2 For precise petrographic identification, a non-exhaustive list of reference literature is given in the

Bibliography.

This document covers only natural aggregates. It is used to describe massive rocks and unconsolidated

rocks.

Annex A provides guidance on the petrographic nomenclature by giving definitions of simple

petrographic terms applicable to rock types used for aggregates.
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 932-1, Tests for general properties of aggregates - Part 1: Methods for sampling

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
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
3.1
massive rock

rock consisting of consolidated mineral phases. Massive rocks can be classified into three major

petrographic types, according to their origin: igneous, sedimentary and metamorphic

3.2
unconsolidated rock

rock consisting of individual particles, e.g. alluvial or natural lightweight rock. Unconsolidated rocks can

be classified into three major petrographic types, according to their origin: igneous, sedimentary and

metamorphic
---------------------- Page: 6 ----------------------
oSIST prEN 932-3:2020
prEN 932-3:2020 (E)
3.3
igneous rock

rock formed from molten rock (magma) either at or below the earth's surface. The latter can be divided

into two classes, plutonic and hypabbysal. Plutonic rocks are formed at depth in large bodies and

typically have a coarse crystalline texture, with crystals clearly visible to the naked eye. Hypabyssal

rocks are formed in smaller bodies near, but not at, the earth's surface and have usually a fine crystalline

texture. Extrusive or volcanic rocks are formed as lavas and pyroclastics at the earth's surface and have

a very fine or glassy texture
3.4
sedimentary rock

indurated rock formed at the earth's surface by the accumulation, or precipitation, of the products of

weathering and erosion of existing rocks. They can also be formed by the accumulation of organic debris.

Such accumulated material can remain unconsolidated or it can be lithified into rock. Sedimentary rocks

are usually layered
3.5
metamorphic rock

rock formed from pre-existing rocks by the action of heat and/or pressure in the earth's crust, which

has caused mineralogical and structural transformations. Metamorphic rocks frequently have

anisotropic texture
3.6
natural lightweight aggregate
or a loose bulk density not exceeding
aggregate with a particle density not exceeding 2000 kg/m
1200 kg/m
3.7
laboratory sample
sample intended for laboratory testing
3.8
test portion
sample used as a whole in a single test
3.9
gravel

an unconsolidated, natural accumulation of typically rounded rock particles resulting from erosion

The gravel particles are often rounded, (e.g. from alluvial deposits), but they can also be angular to sub-

rounded in shape (e.g. from moraine deposits)
4 Reagent and apparatus
4.1 Test sieve, 4 mm, conforming to EN 933-2
4.2 Handlens
4.3 Pen knife
4.4 Stereoscopic microscope, (magnification: typically 10X to 100X)
4.5 Polarizing microscope, optional
4.6 Reagent, diluted hydrochloric acid
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oSIST prEN 932-3:2020
prEN 932-3:2020 (E)
4.7 Magnet, optional
5 Laboratory sample
5.1 General

The laboratory sample shall be taken either from exposed faces of quarries or drill cores, or from stock

piles for aggregates.
5.2 Massive rock sample

In the case of a massive rock sample, the mass of a laboratory sample for the examination shall be not

less than 5 kg.
5.3 Unconsolidated rock sample

In the case of unconsolidated rock, the testing will be done on aggregates. The sampling of aggregates

shall be carried out according to EN 932-1.
5.4 Laboratory sample taken directly on aggregates

The minimum mass of the laboratory sample depends on the aggregate size D, and shall be determined

by sieving according to EN 933-1.
6 Test procedure
6.1 Description of a massive rock sample
6.1.1 Examination and description

First, examine the sample visually to determine the constituent rock or mineral types.

NOTE 1 It can be appropriate to wash the sample before examination.

Then, inspect each rock type carefully using a handlens or a stereoscopic microscope and other

appropriate means.
Describe the sample and include the following:

a) grain size of the main constituents, texture, anisotropy, porosity, vesicularity (in volcanic rocks) and

colour;

b) main minerals that can be identified (quartz, feldspars, calcite, dolomite, etc.);

c) state of alteration and weathering.

NOTE 2 The description can also include comments on the presence, even in small quantities, of some

constituents which can be of concern in particular circumstances (such as opal, micas or other phyllosilicates,

sulphates, iron sulphides and organic materials).
6.1.2 Designation
From the examination specified in 6.1.1, assign if poss
...