ISO/PRF 22965-1

Concrete — Part 1: Methods of specifying and guidance for the specifier

Béton — Partie 1: Méthodes de spécification et lignes directrices pour le spécificateur

General Information

• Status: Not Published
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: ISO/TC 71/SC 3 - Concrete production and execution of concrete structures
• Drafting Committee: ISO/TC 71/SC 3 - Concrete production and execution of concrete structures
• Current Stage: 6000 - International Standard under publication

Relations

• Revises: ISO 22965-1:2007 - Concrete — Part 1: Methods of specifying and guidance for the specifier
• Effective Date: 06-Jun-2022

Standards Content (Sample)

International
Standard
ISO 22965-1
Second edition
Concrete —
Part 1:
Methods of specifying and guidance
for the specifier
Béton —
Partie 1: Méthodes de spécification et lignes directrices pour le
spécificateur
PROOF/ÉPREUVE
Reference number
ISO 22965-1:2025(en) © ISO 2025

ISO 22965-1:2025(en)
© ISO 2025
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
ISO 22965-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms. 5
5 Specification of concrete . 5
5.1 General .5
5.2 Specification of designed concrete .6
5.2.1 General .6
5.2.2 Basic requirements .6
5.2.3 Additional requirements .7
5.3 Specification for prescribed concrete .7
5.3.1 General .7
5.3.2 Basic requirements .7
5.3.3 Additional requirements .8
5.4 Specification for standardized prescribed concrete .9
5.4.1 General .9
5.4.2 Basic requirements .9
5.4.3 Additional requirements .9
6 Exchange of information . 9
6.1 Information from the specifier of the concrete to the supplier .9
6.2 Information from the supplier of the concrete to the specifier .10
7 Guidance on the national annex . 10
Annex A (informative) Guidance for the specifier of exposure classes, consistence classes and
strength classes .11
Annex B (informative) Identity testing for compressive strength .16
Annex C (informative) Guidance on the national annex .18
Bibliography . 19
PROOF/ÉPREUVE
iii
ISO 22965-1:2025(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 3, Concrete production and execution of concrete.
This second edition cancels and replaces the first edition (ISO 22965-1:2007), which has been technically
revised.
The main changes are as follows:
— addition of references reflecting relevant new developments (i.e. the ISO 13315 series);
— addition of exposure classes (see Annex A), in order to reflect the diversity of environments in which
structures are located;
— alignment with the class of slump with ISO 1920-2 (see Annex A).
A list of all parts in the ISO 22965 series can be found on the ISO website.
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.
PROOF/ÉPREUVE
iv
ISO 22965-1:2025(en)
Introduction
This document is intended for nations that have no national concrete standard. It sets out a framework
of principles for nations revising their national standards. This document can also be applied to specific
projects where a project specification supplements the standards in lieu of a national annex applicable at the
place of use.
This document is applied under various climatic and geographical conditions, various levels of protection
and under different established regional traditions and experience. Consequently, this document includes
classes for concrete with different properties to cover the most frequent and typical situations. For certain
uses of concrete, additional or deviating rules can be necessary. The national provisions, preferably given
in a national annex to this document, or the project specification can specify any additional or deviating
requirements.
Some ISO member bodies have developed local tests and criteria for performance-based specifications. This
document does not exclude the continuation and development of such practices valid in the place of use of
the concrete as an alternative to the prescriptive approach. These requirements must be specified in the
national annex or national complementary provisions. The Model Code for Service Limit Design (MC-SLD)
was published as ISO 16204 in 2012.
This document incorporates rules for the use of constituents that are covered by International Standards.
For materials for which International Standards have not yet been published, the standards cited in the
national annex (often the regional or national standards) apply (see 5.1). In particular, documents in current
use for by-products of industrial processes, recycled materials, etc. are based on local experience. Until
international specifications for these materials are available, this document does not provide rules for their
use, but instead refers to the national annex.
This document defines the two parties involved in the ordering and the supply of concrete, which are
hereinafter referred to as specifier and supplier. In practice, there can be several parties specifying
requirements at various stages of the design and construction process, e.g. the client, the designer, the
quantity surveyor, the constructor and the concreting subcontractor. Each is expected to pass the specified
requirements, together with any additional requirements, to the next party in the chain until they reach the
supplier. In the terms of this document, this final compilation of requirements is known as the “concrete
specification”. In some cases, the specifier and the supplier are the same party (e.g. a constructor doing
design, production and execution). In the case of ready-mixed concrete, the purchaser is the specifier.
This document also gives rules for the exchange of information between the parties. Contractual matters are
not covered by this document. Other International Standards for specific products, e. g. pre-cast products,
or for processes within the field of the scope of this document, can require or permit deviations from this
document.
PROOF/ÉPREUVE
v
International Standard ISO 22965-1:2025(en)
Concrete —
Part 1:
Methods of specifying and guidance for the specifier
1 Scope
This document specifies requirements for the specification of concrete and gives guidelines for the exchange
of information between the specifier and supplier. Annex A gives general guidance on specification. More
specific guidance on specification related to the local conditions can be given in a national annex.
This document applies to concrete for structures cast in situ, pre-cast structures and structural pre-cast
products for buildings and civil engineering structures. The concrete can be mixed on site, ready-mixed
concrete or produced in a plant for pre-cast concrete products.
This document applies to concrete compacted to retain no appreciable amount of entrapped air other than
entrained air and to normal-weight, heavy-weight, and light-weight concrete.
This document does not apply to:
— concrete with a maximum aggregate size equal to or less than 4 mm or 5 mm (mortar);
— aerated concrete;
— foamed concrete;
— concrete with an open structure (“no-fine aggregate” concrete);
— concrete with a density less than 800 kg/m ;
— refractory concrete.
This document does not cover health and safety requirements for the protection of workers during
production and delivery of concrete.
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 refere
...

ISO/TC 71/SC 3/WG 1
Date: 2025-02-10
Secretariat: SN
Date: 2025-03-25
Concrete —
Part 1:
Methods of specifying and guidance for the specifier
Béton —
Partie 1: Méthodes de spécification et lignes directrices pour le spécificateur
PROOF
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
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO/DISPRF 22965-1:2025(en)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 5
5 Specification of concrete . 5
5.1 General. 5
5.2 Specification of designed concrete . 6
5.3 Specification for prescribed concrete . 8
5.4 Specification for standardized prescribed concrete . 9
6 Exchange of information . 10
6.1 Information from the specifier of the concrete to the supplier . 10
6.2 Information from the supplier of the concrete to the specifier . 10
7 Guidance on the national annex . 11
Annex A (informative) Guidance for the specifier of exposure classes, consistence classes and
strength classes . 12
Annex B (informative) Identity testing for compressive strength . 18
Annex C (informative) Guidance on the national annex . 20
Bibliography . 21

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO [had/had not] received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 3, Concrete production and execution of concrete structures.
This second edition cancels and replaces the first edition (ISO 22965-1:2007), which has been technically
revised.
The main changes are as follows:
— — addition of references reflecting relevant new developments (i.e. the ISO 13315 series);
— — addition of exposure classes (see Annex AAnnex A),), in order to reflect the diversity of environments
in which structures are located;
— — alignment with the class of slump with ISO 1920-2 (see Annex AAnnex A).).
A list of all parts in the ISO 22965 series can be found on the ISO website.
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/DISPRF 22965-1:2025(en)
Introduction
This document is intended for nations that have no national concrete standard. It sets out a framework of
principles for nations revising their national standards. This document can also be applied to specific projects
where a project specification supplements the standards in lieu of a national annex applicable at the place of
use.
This document is applied under various climatic and geographical conditions, various levels of protection and
under different established regional traditions and experience. Consequently, this document includes classes
for concrete with different properties to cover the most frequent and typical situations. For certain uses of
concrete, additional or deviating rules can be necessary. The national provisions, preferably given in a national
annex to this document, or the project specification can specify any additional or deviating requirements.
Some ISO member bodies have developed local tests and criteria for performance-based specifications. This
document does not exclude the continuation and development of such practices valid in the place of use of the
concrete as an alternative to the prescriptive approach. These requirements must be specified in the national
annex or national complementary provisions. The Model Code for Service Limit Design (MC-SLD) was
published as ISO 16204 in 2012.
This document incorporates rules for the use of constituents that are covered by International Standards. For
materials for which International Standards have not yet been published, the standards cited in the national
annex (often the regional or national standards) apply (see 5.15.1).). In particular, documents in current use
for by-products of industrial processes, recycled materials, etc. are based on local experience. Until
international specifications for these materials are available, this document does not provide rules for their
use, but instead refers to the national annex.
This document defines the two parties involved in the ordering and the supply of concrete, which are
hereinafter referred to as specifier and supplier. In practice, there can be several parties specifying
requirements at various stages of the design and construction process, e.g. the client, the designer, the quantity
surveyor, the constructor and the concreting subcontractor. Each is expected to pass the specified
requirements, together with any additional requirements, to the next party in the chain until they reach the
supplier. In the terms of this document, this final compilation of requirements is known as the “concrete
specification”. In some cases, the specifier and the supplier are the same party (e.g. a constructor doing design,
production and execution). In the case of ready-mixed concrete, the purchaser is the specifier.
This document also gives rules for the exchange of information between the parties. Contractual matters are
not covered by this document. Other International Standards for specific products, e. g. pre-cast products, or
for processes within the field of the scope of this document, can require or permit deviations from this
document.
v
DRAFT International Standard ISO/DIS 22965-1:2025(en)

Concrete —
Part 1:
Methods of specifying and guidance for the specifier
1 Scope
This document specifies requirements for the specification of concrete and gives guidelines for the exchange
of information between the specifier and supplier. Annex AAnnex A gives general guidance on specification.
More specific guidance on specification related to the local conditions can be given in a national annex.
This document applies to concrete for structures cast in situ, pre-cast structures and structural pre-cast
products for buildings and civil engineering structures. The concrete can be mixed on site, ready-mixed
concrete or produced in a plant for pre-cast concrete products.
This document applies to concrete compacted to retain no appreciable amount of entrapped air other than
entrained air and to normal-weight, heavy-weight, and light-weight concrete.
This document does not apply to:
— — concrete with a maximum aggregate size equal to or less than 4 mm or 5 mm (mortar);
— — aerated concrete;
— — foamed concrete;
— — concrete with an open structure (“no-fine aggregate” concrete);
— — concrete with a density less than 800 kg/m ;
— — refractory concrete.
This document does not cover health and safety requirements for the protection of workers during production
and delivery of concrete.
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 22965--2, Concrete — Part 2: Specification of constituent materials, production of concrete and conformance
of concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
addition
finely divided or ground material used in concrete (3.7(3.7)) to improve certain properties or to achieve
special properties
Note 1 to entry: This document deals with two types of additions:
— — nearly inert additions (type I);
— — pozzolanic or latent hydraulic additions (type II).
3.2 3.2
admixture
material added during the mixing process of concrete (3.7(3.7)) in small quantities relative to the mass of
cement to modify the properties of fresh concrete (3.14(3.14)) or hardened concrete (3.15(3.15))
3.3 3.3
aggregate
granular mineral material suitable for use in concrete (3.7(3.7))
Note 1 to entry: Aggregates can be natural, artificial, or recycled from material previously used in construction, e.g.,
recycled concrete aggregate.
3.4 3.4
batch
quantity of fresh concrete (3.14(3.14)) produced in one cycle of operations of a mixer, or the quantity
discharged during 1 min from a continuous mixer or quantity of concrete (3.7(3.7)) transported in a vehicle
Note 1 to entry: For testing to be performed at site, the concrete transported as one load in a vehicle can be considered
as one batch.
3.5 3.5
cement
finely ground inorganic material that, when mixed with water, forms a paste that sets and
hardens by means of hydration reactions and processes and that, after hardening, retains its strength and
stability even under water
3.6 3.6
characteristic strength
value of strength below which 5 % of the population of all possible strength determinations of the volume of
concrete (3.7(3.7)) under consideration are expected to fall
3.7 3.7
concrete
material formed by mixing cement (3.5(3.5),), coarse and fine aggregate (3.3(3.3)) and water, with or without
the incorporation of admixtures (3.2(3.2)) and additions (3.1(3.1),), which develops its properties by
hydration of the cement (3.5(3.5))
Note 1 to entry: International Standards for aggregate can define aggregates larger t
...