Geotextiles and geotextile-related products - Determination of the characteristic opening size (ISO 12956:2019)

This document specifies a method for the determination of the characteristic size of the openings of a single layer of a geotextile or geotextile-related product using the wet-sieving principle.

Geotextilien und geotextilverwandte Produkte - Bestimmung der charakteristischen Öffnungsweite (ISO 12956:2019)

Dieses Dokument legt ein Verfahren für die Bestimmung der charakteristischen Öffnungsweite eines einlagigen Geotextils oder geotextilverwandten Produkts nach dem Prinzip der Nasssiebung fest.

Géotextiles et produits apparentés - Détermination de l'ouverture de filtration caractéristique (ISO 12956:2019)

Le présent document présente une méthode permettant de déterminer la dimension caractéristique des ouvertures d'une couche simple de géotextile ou de produit apparenté selon le principe de tamisage par voie humide.

Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje značilnih velikosti odprtin (ISO 12956:2019)

Ta dokument določa metodo za določitev značilne velikosti odprtin enega sloja geotekstilije ali geotekstiliji sorodnega izdelka z uporabo načela mokrega sejanja.

General Information

Status
Published
Publication Date
14-Jan-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
15-Jan-2020
Completion Date
15-Jan-2020

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SLOVENSKI STANDARD
SIST EN ISO 12956:2020
01-marec-2020
Nadomešča:
SIST EN ISO 12956:2012

Geotekstilije in geotekstilijam sorodni izdelki - Ugotavljanje značilnih velikosti

odprtin (ISO 12956:2019)

Geotextiles and geotextile-related products - Determination of the characteristic opening

size (ISO 12956:2019)
Geotextilien und geotextilverwandte Produkte - Bestimmung der charakteristischen
Öffnungsweite (ISO 12956:2019)
Géotextiles et produits apparentés - Détermination de l'ouverture de filtration
caractéristique (ISO 12956:2019)
Ta slovenski standard je istoveten z: EN ISO 12956:2020
ICS:
59.080.70 Geotekstilije Geotextiles
SIST EN ISO 12956:2020 en,fr,de

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

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SIST EN ISO 12956:2020
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SIST EN ISO 12956:2020
EN ISO 12956
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 59.080.70 Supersedes EN ISO 12956:2010
English Version
Geotextiles and geotextile-related products -
Determination of the characteristic opening size (ISO
12956:2019)

Géotextiles et produits apparentés - Détermination de Geotextilien und geotextilverwandte Produkte -

l'ouverture de filtration caractéristique (ISO Bestimmung der charakteristischen Öffnungsweite

12956:2019) (ISO 12956:2019)
This European Standard was approved by CEN on 5 December 2019.

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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12956:2020 E

worldwide for CEN national Members.
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SIST EN ISO 12956:2020
EN ISO 12956:2020 (E)
Contents Page

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

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SIST EN ISO 12956:2020
EN ISO 12956:2020 (E)
European foreword

This document (EN ISO 12956:2020) has been prepared by Technical Committee ISO/TC 221

"Geosynthetics" in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariat

of which is held by NBN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by July 2020, and conflicting national standards shall be

withdrawn at the latest by July 2020.

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 ISO 12956:2010.

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

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech 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.
Endorsement notice

The text of ISO 12956:2019 has been approved by CEN as EN ISO 12956:2020 without any modification.

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SIST EN ISO 12956:2020
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SIST EN ISO 12956:2020
INTERNATIONAL ISO
STANDARD 12956
Third edition
2019-12
Geotextiles and geotextile-related
products — Determination of the
characteristic opening size
Géotextiles et produits apparentés — Détermination de l'ouverture de
filtration caractéristique
Reference number
ISO 12956:2019(E)
ISO 2019
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Apparatus and materials.............................................................................................................................................................................. 2

6 Test specimens........................................................................................................................................................................................................ 5

6.1 Handling........................................................................................................................................................................................................ 5

6.2 Selection........................................................................................................................................................................................................ 5

6.3 Number and dimensions ................................................................................................................................................................ 5

6.4 Specimen condition ............................................................................................................................................................................ 6

7 Procedure..................................................................................................................................................................................................................... 6

8 Calculation and expression of results ............................................................................................................................................. 8

9 Test report ................................................................................................................................................................................................................... 8

Annex A (normative) Mesh sizes ............................................................................................................................................................................10

Annex B (informative) Example of the determination of the characteristic opening size .........................11

Annex C (informative) Preparation of knitted tubular geotextiles for testing ......................................................13

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

© ISO 2019 – All rights reserved iii
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 221, Geosynthetics.

This third edition cancels and replaces the second edition (ISO 12956:2010), which has been technically

revised. The main changes compared to the previous edition are as follows:

— the average used in order to select the number of specimens is modified (25 % to 15 %);

— explanations are given for the preparation of knitted tubular geotextiles.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 12956:2020
INTERNATIONAL STANDARD ISO 12956:2019(E)
Geotextiles and geotextile-related products —
Determination of the characteristic opening size

IMPORTANT — The electronic file of this document contains colours which are considered to be

useful for the correct understanding of the document. Users should therefore consider printing

this document using a colour printer.
1 Scope

This document specifies a method for the determination of the characteristic size of the openings of a

single layer of a geotextile or geotextile-related product using the wet-sieving principle.

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.

ISO 9862, Geosynthetics — Sampling and preparation of test specimens
ISO 10320, Geosynthetics — Identification on site
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
— IEC Electropedia: available at http:// www .electropedia .org/
3.1

particle size for which n % mass fraction is smaller than the mass of measured particles

3.2

size of opening which is equal to the particle of size d of the granular material which passes through

the geotextile or geotextile-related product, expressed in µm
3.3
coefficient of uniformity, defined as d /d
60 10
4 Principle

The principle of the test is to determine the opening size (O ) which corresponds to the specified size

of the granular material passed.
© ISO 2019 – All rights reserved 1
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
5 Apparatus and materials
5.1 Sieving apparatus, composed of the following elements.

5.1.1 Sieving unit, allowing for the testing of a specimen with an exposed sieving area corresponding

to a minimum diameter of 130 mm, complying with the following requirements:
a) sieving device, with a frequency of 50 Hz to 60 Hz;

b) predominantly vertical sieve motion capable of maintaining a 1,5 mm amplitude (3 mm swing

height, see Figure 1) over the period of test.
Key
X time 1,5 mm amplitude.
Y swing height 3 mm swing height.
Figure 1 — Amplitude and swing height
5.1.2 Water supply system.

5.1.3 Spray nozzle(s), to ensure even wetting of the test specimen, enclosed in a transparent cylinder

and/or covering cap to avoid soil or granular material loss.

It is recommended that the nozzle(s) be capable of a water discharge of approximately 0,5 l/min at a

working pressure of about 300 kPa. A valve should be available to regulate the flow of water.

5.1.4 Specimen clamping device, to transmit all the energy to the specimen during sieving.

5.1.5 Pan, affixed to the sieving apparatus, with a connection tube to the device for filtering the water

and collecting granular material passing through the specimen.
NOTE Typical sieving equipment is represented in Figure 2.
2 © ISO 2019 – All rights reserved
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
Key
1 water supply 7 pan
2 spray nozzle(s) 8 connection tube
3 specimen clamping device 9 amplitude regulator
4 granular material 10 filter paper
5 specimen 11 collection device
6 support grid
Figure 2 — Example of sieving apparatus

5.1.6 Grid, with wire between 1 mm and 2,5 mm in diameter and a mesh size of (10 ± 1) mm, with a

minimum of 90 % opening area to support the specimen during the test, to avoid excessive deformation

of the specimen under the weight of the granular material.
5.1.7 Sealant, in order to avoid loss of granular material.
NOTE Examples of sealant positions are represented in Figure 3.
© ISO 2019 – All rights reserved 3
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SIST EN ISO 12956:2020
ISO 12956:2019(E)
a) Example with two rubber rings b) Example with one rubber ring
Key
1 cover
2 PVC or metallic ring
3 rubber ring
4 specimen
5 support grid
Figure 3 — Examples of sealant positions

5.1.8 Cover, fully transparent or equipped with a transparent window to permit observation and

check that there is no w
...

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