Geotechnical investigation and testing - Laboratory testing of soil - Part 5: Incremental loading oedometer test (ISO 17892-5:2017)

ISO 17892-5:2017 specifies methods for the determination of the compressibility characteristics of soils by incremental loading in an oedometer.
ISO 17892-5:2017 is applicable to the laboratory determination of the compression and deformation characteristics of soil within the scope of geotechnical investigations.
The oedometer test is carried out on a cylindrical test specimen that is confined laterally by a rigid ring. The specimen is subjected to discrete increments of vertical axial loading or unloading and is allowed to drain axially from the top and bottom surfaces. Tests may be carried out on undisturbed, remoulded, recompacted or reconstituted specimens.
The stress paths and drainage conditions in foundations are generally three dimensional and differences can occur in the calculated values of both the magnitude and the rate of settlement.
The small size of the specimen generally does not adequately represent the fabric features present in natural soils.
Analysis of consolidation tests is generally based on the assumption that the soil is saturated. In case of unsaturated soils, some of the derived parameters may not be appropriate
NOTE This document fulfils the requirements of the determination of the compressibility characteristics of soils in the oedometer for geotechnical investigation and testing in accordance with EN 1997?1 and EN 1997?2.

Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 5: Oedometerversuch mit stufenweiser Belastung (ISO 17892-5:2017)

Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 5: Essai de chargement par palier à l'oedomètre (ISO 17892-5:2017)

La présente Norme internationale spécifie des méthodes de détermination des caractéristiques de compressibilité des sols par essai à l'œdomètre sur sol saturé.
La présente Norme internationale est applicable à la détermination en laboratoire des caractéristiques de compression et de déformation du sol dans le domaine d'application de la reconnaissance géotechnique.
L'essai à l'œdomètre est réalisé sur une éprouvette d'essai cylindrique confinée latéralement par un anneau rigide. L'éprouvette est soumise à un chargement ou déchargement vertical et axial par paliers, tout en étant drainée axialement par le haut et par le bas. Les essais peuvent être réalisés sur des éprouvettes de sol non remanié ou remanié.
Les chemins de contraintes et les conditions de drainage sous des fondations sont généralement tridimensionnels, et des différences peuvent apparaître au niveau des valeurs calculées pour le tassement ou pour sa vitesse.
La petite dimension de l'éprouvette ne permet généralement pas de représenter correctement les hétérogénéités présentes dans les sols naturels.
L'analyse d'un essai de consolidation repose généralement sur l'hypothèse que le sol est saturé. Dans le cas de sols non saturés, certains paramètres déduits de l'essai peuvent ne pas être corrects.
NOTE Le présent document satisfait aux exigences de détermination des caractéristiques de compressibilité des sols par essai à l'œdomètre pour la reconnaissance et les essais géotechniques conformément à l'EN 1997‑1 et à l'EN 1997‑2.

Geotehnično preiskovanje in preskušanje - Laboratorijsko preskušanje zemljin - 5. del: Edometrski preskus s postopnim obremenjevanjem (ISO 17892-5:2017)

Ta dokument je namenjen določanju lastnosti stiskanja, nabrekanja in konsolidacije zemljin. Cilindrični preskusni vzorec je bočno zaprt, podvržen diskretnim intervalom z navpičnim osnim obremenjevanjem ali razbremenjevanjem, pri čemer je dovoljena drenaža vzdolž osi z zgornje in s spodnje površine.
Glavni parametri, ki so pridobljeni z edometrskim preskusom, se nanašajo na stisljivost in stopnjo primarne konsolidacije zemljin. Včasih je mogoče pridobiti tudi ocene predkonsolidacijskega tlaka, stopnje sekundarnega stiskanja in značilnosti nabrekanja.

General Information

Status
Published
Publication Date
21-Mar-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
22-Mar-2017
Completion Date
22-Mar-2017

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SLOVENSKI STANDARD
SIST EN ISO 17892-5:2017
01-september-2017
1DGRPHãþD
SIST-TS CEN ISO/TS 17892-5:2004
SIST-TS CEN ISO/TS 17892-5:2004/AC:2010

*HRWHKQLþQRSUHLVNRYDQMHLQSUHVNXãDQMH/DERUDWRULMVNRSUHVNXãDQMH]HPOMLQ

GHO(GRPHWUVNLSUHVNXVVSRVWRSQLPREUHPHQMHYDQMHP ,62

Geotechnical investigation and testing - Laboratory testing of soil - Part 5: Incremental

loading oedometer test (ISO 17892-5:2017)

Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 5:

Oedometerversuch mit stufenweiser Belastung (ISO 17892-5:2017)

Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 5:

Essai de chargement par palier à l'oedomètre sur sol saturé (ISO 17892-5:2017)
Ta slovenski standard je istoveten z: EN ISO 17892-5:2017
ICS:
13.080.20 Fizikalne lastnosti tal Physical properties of soils
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
SIST EN ISO 17892-5:2017 en

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

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SIST EN ISO 17892-5:2017
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SIST EN ISO 17892-5:2017
EN ISO 17892-5
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 93.020; 13.080.20 Supersedes CEN ISO/TS 17892-5:2004
English Version
Geotechnical investigation and testing - Laboratory testing
of soil - Part 5: Incremental loading oedometer test (ISO
17892-5:2017)

Reconnaissance et essais géotechniques - Essais de Geotechnische Erkundung und Untersuchung -

laboratoire sur les sols - Partie 5: Essai de chargement Laborversuche an Bodenproben - Teil 5:

par palier à l'oedométre (ISO 17892-5:2017) Oedometerversuch mit stufenweiser Belastung (ISO

17892-5:2017)
This European Standard was approved by CEN on 3 February 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17892-5:2017 E

worldwide for CEN national Members.
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SIST EN ISO 17892-5:2017
EN ISO 17892-5:2017 (E)
Contents Page

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

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SIST EN ISO 17892-5:2017
EN ISO 17892-5:2017 (E)
European foreword

This document (EN ISO 17892-5:2017) has been prepared by Technical Committee CEN/TC 341

“Geotechnical Investigation and Testing”, the secretariat of which is held by BSI, in collaboration with

Technical Committee ISO/TC 182 “Geotechnics”.

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 2017, and conflicting national standards

shall be withdrawn at the latest by September 2017.

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 CEN ISO/TS 17892-5:2004.

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, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 17892-5:2017 has been approved by CEN as EN ISO 17892-5:2017 without any

modification.
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SIST EN ISO 17892-5:2017
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SIST EN ISO 17892-5:2017
INTERNATIONAL ISO
STANDARD 17892-5
First edition
2017-02
Geotechnical investigation and
testing — Laboratory testing of soil —
Part 5:
Incremental loading oedometer test
Reconnaissance et essais géotechniques — Essais de laboratoire sur
les sols —
Partie 5: Essai de chargement par palier à l’oedométre
Reference number
ISO 17892-5:2017(E)
ISO 2017
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 2

5 Equipment ................................................................................................................................................................................................................... 3

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

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

6.2 Specimen preparation ...................................................................................................................................................................... 6

6.2.1 Selection of preparation method ....................................................................................................................... 6

6.2.2 Trimming from extruded or block sample ................................................................................................ 6

6.2.3 Extrusion from tube of diameter larger than the oedometer ring ........................................ 7

6.2.4 Recompacted specimens ........................................................................................................................................... 7

6.3 Measurement ............................................................................................................................................................................................ 7

6.4 Preparation of apparatus ............................................................................................................................................................... 7

6.4.1 Assembly of cell ................................................................................................................................................................ 7

6.4.2 Assembly in load frame .............................................................................................................................................. 8

6.5 Loading .......................................................................................................................................................................................................... 8

6.5.1 Loading sequence ...................................................................... ...................................................................................... 8

6.5.2 Application of loads ....................................................................................................................................................... 9

6.6 Dismantling ................................................................................................................................................................................................ 9

7 Test results ...............................................................................................................................................................................................................10

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

7.2 Initial values ...........................................................................................................................................................................................10

7.2.1 General...................................................................................................................................................................................10

7.2.2 Initial water content ..................................................................................................................................................10

7.2.3 Initial bulk and dry density .................................................................................................................................10

7.3 Compressibility characteristics .............................................................................................................................................10

7.3.1 General...................................................................................................................................................................................10

7.3.2 Specimen height ............................................................................................................................................................10

7.3.3 Vertical strain ...................................................................................................................................................................11

7.3.4 Void ratio .............................................................................................................................................................................11

7.3.5 Compression-stress diagram..............................................................................................................................12

8 Test report ................................................................................................................................................................................................................12

8.1 Mandatory reporting ......................................................................................................................................................................12

8.2 Optional reporting ............................................................................................................................................................................13

Annex A (normative) Calibration, maintenance and checks ....................................................................................................14

Annex B (informative) Additional calculations ......................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................26

© ISO 2017 – All rights reserved iii
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(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 on 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 the following

URL: w w w . i s o .org/ iso/ foreword .html.

ISO 17892-5 was prepared by the European Committee for Standardization (CEN) Technical Committee

CEN/TC 341, Geotechnical investigation and testing, in collaboration with ISO Technical Committee

ISO/TC 182, Geotechnics, in accordance with the agreement on technical cooperation between ISO and

CEN (Vienna Agreement).

This first edition cancels and replaces ISO/TS 17892-5:2004, which has been technically revised. It also

incorporates the Technical Corrigendum ISO/TS 17892-5:2004/Cor 1:2006.
A list of all parts in the ISO 17892 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
Introduction

This document covers areas in the international field of geotechnical engineering never previously

standardized internationally. It is intended that this document presents broad good practice

throughout the world and significant differences with national documents is not anticipated. It is based

on international practices (see Reference [1]).
© ISO 2017 – All rights reserved v
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SIST EN ISO 17892-5:2017
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SIST EN ISO 17892-5:2017
INTERNATIONAL STANDARD ISO 17892-5:2017(E)
Geotechnical investigation and testing — Laboratory
testing of soil —
Part 5:
Incremental loading oedometer test
1 Scope

This document specifies methods for the determination of the compressibility characteristics of soils

by incremental loading in an oedometer.

This document is applicable to the laboratory determination of the compression and deformation

characteristics of soil within the scope of geotechnical investigations.

The oedometer test is carried out on a cylindrical test specimen that is confined laterally by a rigid ring.

The specimen is subjected to discrete increments of vertical axial loading or unloading and is allowed

to drain axially from the top and bottom surfaces. Tests may be carried out on undisturbed, remoulded,

recompacted or reconstituted specimens.

The stress paths and drainage conditions in foundations are generally three dimensional and differences

can occur in the calculated values of both the magnitude and the rate of settlement.

The small size of the specimen generally does not adequately represent the fabric features present in

natural soils.

Analysis of consolidation tests is generally based on the assumption that the soil is saturated. In case of

unsaturated soils, some of the derived parameters may not be appropriate

NOTE This document fulfils the requirements of the determination of the compressibility characteristics of

soils in the oedometer for geotechnical investigation and testing in accordance with EN 1997–1 and EN 1997–2.

2 Normative references

The following documents are referred to in 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 14688-1, Geotechnical investigation and testing — Identification and classification of soil — Part 1:

Identification and description

ISO 17892-1, Geotechnical investigation and testing — Laboratory testing of soil — Part 1: Determination

of water content

ISO 17892-2, Geotechnical investigation and testing — Laboratory testing of soil — Part 2: Determination

of bulk density

ISO 17892-3, Geotechnical investigation and testing — Laboratory testing of soil — Part 3: Determination

of particle density
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2017 – All rights reserved 1
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)

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 http:// www .iso .org/ obp
3.1
excess pore pressure

difference between the pore water pressure and the equilibrium pore pressure at the end of

consolidation
3.2
primary consolidation

process whereby the void ratio of a specimen decreases as a result of an increase in the effective stress

due to a decrease in the excess pore pressure (3.1) under constant total applied load

Note 1 to entry: Time dependent volume change during primary consolidation is primarily controlled by drainage

conditions.
3.3
secondary compression

process in which compression occurs independent from excess pore pressure (3.1) dissipation

Note 1 to entry: Time dependant volume change during secondary compression is controlled by factors other

than drainage conditions.
3.4
swelling
expansion due to reduction of stress or due to increase in water content
3.5
swelling pressure

pressure required to maintain constant volume (i.e. to prevent absorption of water) when a soil is

flooded with water.
4 Symbols
A cross-sectional area of the specimen (mm )
D mean diameter of the oedometer ring (mm)
d deformation gauge reading at the end of a load increment
d deformation gauge reading at the start of a load increment
e void ratio of the specimen at the end of a load increment
e initial void ratio of the specimen at the start of the test
H mean height of the oedometer ring (mm)
H height of the specimen at the end of a load increment (mm)
H height of the specimen at the start of a load increment (mm)
H equivalent height of solids (mm)
H initial height of the specimen at the start of the test (mm)
m dry mass of the specimen (g)
2 © ISO 2017 – All rights reserved
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
w initial water content of the specimen (%)

ε vertical strain at the end of an increment, compression being defined as positive strain (%)

v,f
ρ initial bulk density of the specimen (Mg/m )
ρ initial dry density of the specimen (Mg/m )
ρ particle density (Mg/m )
σ´ vertical effective stress (kPa)
5 Equipment
See Annex A for calibration requirements for the equipment in this clause.
5.1 Oedometer ring

The ring shall be made of corrosion-resistant material and shall have a sharp cutting edge. A ring

mounted with a temporary sharp cutting edge may be used.
Internal dimensions should conform to the following:
— diameter (D): not less than 35 mm;
— height (H): not less than 12 mm;
— ratio (D/H): not less than 2,5.

The internal surface of the ring shall be smooth and may be lubricated with a thin film of silicone grease,

petroleum jelly, or other suitable lubricant.

The ring shall either be laterally confined to restrict expansion under load, or have sufficient stiffness

to prevent the internal diameter expanding by more than 0,05 % when subjected to the maximum

horizontal stress resulting from the test.
5.2 Porous discs

The top and bottom porous discs shall be of corrosion-resistant material and shall allow free drainage

of water, while preventing intrusion of soil particles into their pores. The upper and lower surfaces shall

be plain, clean and undamaged. The material shall be of negligible compressibility under the maximum

stress likely to be applied during the test and shall be strong enough to prevent breakage under load.

If necessary, a filter paper may be used to prevent intrusion of the soil into the porous discs. However,

the permeability of the discs and the filter paper shall be sufficiently high to prevent retardation of the

drainage of the specimen.

The diameter of the top porous disc shall be smaller than the ring by 0,2 mm to 0,5 mm in order to

prevent binding to the ring and to prevent extrusion of the sample, and shall be larger than 85 % of the

diameter of the loading cap. The top porous disc may be tapered towards the upper face to minimize

the risk of binding due to tilt.

In a fixed-ring cell [see Figure 1 a)], the bottom porous disc shall be large enough to support the

oedometer ring.

In a floating-ring cell [see Figure 1 b)], the diameter of the bottom porous disc shall meet the same

requirements as the top disc, but tapered towards the lower face.
© ISO 2017 – All rights reserved 3
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
a) Fixed-ring cell oedometer
b) Floating-ring cell oedometer
Key
1 loading cap
2 lateral restraint for ring
3 cell body
4 porous discs
5 oedometer ring
Figure 1 — General arrangements of typical oedometer cells

Before use, new porous discs shall be saturated by boiling in distilled water for at least 20 min, and

allowed to cool before use.

The surface of the porous discs which have previously been used shall be cleaned, for example using a

natural bristle or nylon brush, followed by a check that the porous discs are readily permeable to water

and that the pores are not clogged by soil particles.

Porous discs shall be kept immersed in water until required for use. For soils that readily absorb water

(e.g. stiff clays), the porous discs should be air-dried immediately before use.
4 © ISO 2017 – All rights reserved
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
5.3 Cell body
The cell body shall be made of a suitable corrosion-resistant material.

A fixed-ring cell [see Figure 1 a)] shall accept the oedometer ring and shall be rigid enough to prevent

significant lateral deformation of the ring when under load.

A floating-ring cell [see Figure 1 b)] shall provide adequate clearance around the outside of the ring.

The assembled cell shall be watertight and shall hold water to a level which submerges the upper

porous disc.
5.4 Loading cap

The loading cap shall be rigid enough to ensure negligible deformation under load. It shall be fitted with

a central load seating and shall be mounted centrally in the oedometer ring.

The loading cap shall have perforations or grooves to allow the free drainage of pore water.

5.5 Deformation measurement

The deformation measuring device shall have a resolution of at least 0,01 % and accuracy of at least

0,1 % of the initial specimen height.

The measurement of deformation of the soil to be tested shall use a device suitable for measuring and

displaying/recording as mentioned above, e.g. a dial gauge or electrical displacement transducer.

5.6 Loading frame

The loading frame shall allow the application of vertical stresses acting centrally on the loading cap

only. The frame may apply load either by addition of physical weights, or by other mechanical, hydraulic,

pneumatic or electromechanical means.

The vertical stress applied to the specimen shall be accurate to at least 1 % of the intended stress or

1 kPa whichever is the greater. The stress shall remain constant within these limits throughout the

duration of a loading increment. The mechanism should allow the application of a given load increment

within a period of 2 s.

Adequate arrangements shall be made to ensure stability of the load frame, or a group of load frames,

when fully loaded. This can be achieved by bolting the load frame or group of load frames to the floor.

The load frame shall be free of vibration.
5.7 Ancillary apparatus
The ancillary apparatus consists of:

— balance, accurate up to 0,01 g or 0,1 % of the weighed mass, whichever value is greater;

— timer, readable to 1 s;
— thermometer, readable to 1°C maximum/minimum;

— metal disc with flat, smooth and parallel end faces. The diameter shall be about 1 mm less than the

internal diameter of the oedometer ring and the height shall be the same as that of the ring;

— apparatus for determination of water content;
— apparatus for determination of particle density;
— vernier or digital callipers, reading to 0,05 mm.
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SIST EN ISO 17892-5:2017
ISO 17892-5:2017(E)
5.8 Apparatus for specimen preparation
The apparatus for specimen preparation consists of:
— cutting and trimming tools, e.g. cheese-wire, wire-saw, sharp knife, scalpel;
— spatulas;
— straight-edge trimmer;
— straight edge;
— steel try-square;
— flat glass plate;

— extrusion equipment and clamping jig, for preparing and trimming specimens from a tube sample.

5.9 Water

Water of a similar chemistry to the pore water should be used if the soil is susceptible to the chemistry

of the water. If the chemistry of the pore water is unknown, tap water should be used as its chemistry is

more likely to be similar to ground water than distilled water would be.
6 Test procedure
6.1 General

The mean diameter of the largest particle within a specimen should be less than one-fifth of the height

of the ring.

The initial water content (w ) should be determined according to ISO 17892-1 on soil trimmings.

6.2 Specimen preparation
6.2.1 Selection of preparation method

6.2.1.1 Test specimens may be prepared by the following methods, depending on the type of sample

available:

— trimming from an undisturbed sample extruded from its sampling tube, or from a block sample;

— extrusion directly into an oedometer ring from a sample tube of a larger diameter than that of the ring;

— recompaction, remoulding, reconstit
...

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