prEN ISO 16383-2

SLOVENSKI STANDARD
01-marec-2026
Geotehnično preiskovanje in preskušanje - Laboratorijsko preskušanje kamnin - 2.
del: Ugotavljanje gostote in odprte poroznosti (ISO/DIS 16383-2:2026)
Geotechnical investigation and testing - Laboratory testing of rock - Part 2: Determination
of density and open porosity (ISO/DIS 16383-2:2026)
Geotechnische Erkundung und Untersuchung - Laborversuche an Felsproben - Teil 2:
Bestimmung der Rohdichte und der offenen Porosität (ISO/DIS 16383-2:2026)
Reconnaissance et essais géotechniques - Essais de laboratoire sur les roches - Partie
2: Détermination de la masse volumique et de la porosité ouverte (ISO/DIS 16383-
2:2026)
Ta slovenski standard je istoveten z: prEN ISO 16383-2
ICS:
13.080.40 Hidrološke lastnosti tal Hydrological properties of
soils
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 16383-2
ISO/TC 182
Geotechnical investigation and
Secretariat: BSI
testing — Laboratory testing of
Voting begins on:
rock —
2026-01-12
Part 2:
Voting terminates on:
2026-04-06
Determination of density and open
porosity
ICS: 13.080.40; 93.020
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 16383-2:2026(en)
DRAFT
ISO/DIS 16383-2:2026(en)
International
Standard
ISO/DIS 16383-2
ISO/TC 182
Geotechnical investigation and
Secretariat: BSI
testing — Laboratory testing of
Voting begins on:
rock —
Part 2:
Voting terminates on:
Determination of density and open
porosity
ICS: 13.080.40; 93.020
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 16383-2:2026(en)
ii
ISO/DIS 16383-2:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units. 3
5 Equipment . 4
5.1 General .4
5.2 Straight edge.4
5.3 Callipers .4
5.4 Balance .4
5.5 Gas pycnometer .4
5.6 Drying oven .4
5.7 Thermometer or thermocouple device .4
5.8 Relative humidity .4
5.9 Test specimen container .4
5.10 Desiccator.5
6 Test procedure . 5
6.1 General .5
6.1.1 Specimen size requirements .5
6.1.2 Test specimen preparation .6
6.2 Determination of bulk mass .6
6.3 Determination of grain mass .6
6.4 Determination of submerged mass using the immersion method .7
6.5 Determination of bulk volume using the linear method .8
6.6 Determination of grain volume using gas pycnometry .9
7 Test results . .10
7.1 Immersion method . . .10
7.1.1 Bulk density .10
7.1.2 Grain density .10
7.1.3 Dry density .10
7.1.4 Open porosity .11
7.2 Linear method combined with gas pycnometry .11
7.2.1 Bulk density .11
7.2.2 Grain density .11
7.2.3 Dry density . 12
7.2.4 Open porosity . 12
8 Test report .13
Annex A (Normative) Calibration, maintenance, and checks . 14
Annex B (Informative) Volume determination .16
Bibliography . 17

iii
ISO/DIS 16383-2:2026(en)
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:
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 182, [Geotechnical investigation and testing],
Subcommittee WG 10, [Laboratory testing of rock].
A list of all parts in the ISO 16 383 series can be found on the ISO website.

iv
ISO/DIS 16383-2:2026(en)
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
practice (see Reference [1]).
v
DRAFT International Standard ISO/DIS 16383-2:2026(en)
Geotechnical investigation and testing — Laboratory testing
of rock —
Part 2:
Determination of density and open porosity
1 Scope
This document specifies the procedure for determining bulk, dry and grain densities as well as open porosity
of a rock specimen using the immersion method and a combination of the linear method and gas pycnometry.
This document is applicable to the laboratory determination of density and open porosity of a rock test
specimen within the scope of geotechnical investigations.
Other methods for determining the bulk mass, grain mass, bulk volume and grain volume of the specimen
that fulfil the requirements set in this document may also be considered acceptable (Annex B). Used method
should be chosen based on the use case (type of specimen, availability etc.).
Bulk, dry and grain density as well as open porosity are determined for the specimen as is and are dependent
on fluid content, which shall be determined and reported as per ISO 16383-1.
NOTE This document fulfils the requirements of the determination of bulk density of rock for geotechnical investigation
and testing in accordance with EN 1997-2 (2024).
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 14689, Geotechnical investigation and testing — Identification, description and classification of rock
ISO 16383-1, Geotechnical investigation and testing — Laboratory testing of rock — Part 1: Determination of
water content
ISO 12154, Determination of density by volumetric displacement — Skeleton density by gas pycnometry
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 https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
Saturation fluid
the fluid used to saturate the specimen
Note 1 to entry: saturation fluid must be reported.

ISO/DIS 16383-2:2026(en)
3.2
Immersion liquid
the liquid the specimen is immersed in, typically water
Note 1 to entry: immersion liquid must be reported.
3.3
Open void
void that can be penetrated by the saturation fluid
3.4
Closed void
void that cannot be penetrated by the saturation fluid
3.5
Void volume
volume of open voids
3.6
Grain volume
volume of the rock matrix, including closed voids, but excluding open voids
3.7
Grain mass
mass of the rock matrix, including closed voids, but excluding open voids
3.8
Bulk volume
total volume of the specimen, including the rock matrix, and open and closed void volumes
3.9
Bulk mass
total mass of the specimen, including the rock matrix, and open and closed void volumes
3.10
Submerged mass
total mass of the specimen, including the rock matrix, and open and closed void volumes, submerged in the
immersion liquid
3.11
Water density
density of water, a constant value of 0,998 2 g/cm corresponding to the density of pure water at 20 °C
(IAPWS95-2018) is used in this document
3.12
Immersion liquid density
density of the immersion liquid
3.13
Water content
ratio of the mass of free water to the mass of the dry specimen, to be determined as per ISO 16383-1
3.14
Density
mass of a substance per unit of volume, also known as specific mass
3.15
Specific gravity
ratio of the density of a substance to the density of a given reference material, typically water at its densest
(at 4 °C), also known as relative density

ISO/DIS 16383-2:2026(en)
3.16
Bulk density
bulk mass of the rock specimen divided by its bulk volume, also known as apparent density
3.17
Dry density
grain mass of the rock specimen divided by its bulk volume
Note 1 to entry: specimen is considered fully dried when it has been dried to a constant mass as per ISO 16383-1.
3.18
Grain density
grain mass of the rock specimen divided by its grain volume, also known as matrix density or particle density
3.19
Open porosity
the ratio of void volume to bulk volume
3.20
Constant mass
the point at which there is less than 0,1 % further change in mass of the rock test specimen when dried for a
further period of at least 1 h, over three consecutive measurements, as described in ISO 16383-1
3.21
Representative specimen
a specimen chosen by a qualified person associated with the characteristic features of the rock mass
4 Symbols and units
V void volume (cm )
V
V grain volume (cm )
G
M grain mass (g)
G
V bulk volume (cm )
M bulk mass (g)
M submerged mass (g)
S
ρ water density (g/cm )
W
ρ immersion liquid density (g/cm )
L
w water content (%)
r radius of the specimen (cm)
h height of the specimen (cm)
L length of the longest dimension of the specimen (cm)
L length of the second longest dimension of the specimen (cm)
L length of the shortest dimension of the specimen (cm)
V volume of the sample chamber (cm )
V volume of the reference chamber (cm )
ISO/DIS 16383-2:2026(en)
p equilibrated gauge pressure prior to expansion (Pa)
p equilibrated gauge pressure after expansion (Pa)
ρ bulk density (g/cm )
ρ grain density (g/cm )
G
ρ dry density (g/cm )
D
P open porosity (%)
NOTE Here r refers to the radius of a cylindrical or spherical specimen, h refers to the height of a cylindrical specimen,
and L , L and L refe
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