ISO 21062:2020

INTERNATIONAL ISO
STANDARD 21062
First edition
2020-05
Corrosion of metals and alloys —
Determination of the corrosion rates
of embedded steel reinforcement in
concrete exposed to simulated marine
environments
Corrosion des métaux et alliages — Détermination des vitesses de
corrosion de l'acier encastrés simulée de l'armature dans le béton
exposé à l'environnement marin
Reference number
©
ISO 2020
© ISO 2020
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 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Test materials . 4
6 Preparation of specimens . 4
6.1 Reinforcing steel cleaning . 4
6.2 Reinforcing steel coating ends . 4
6.3 Adding industrial salt . 4
6.4 Making concrete specimens. 5
7 Test procedure . 5
7.1 Initial performance test . 5
7.1.1 Mechanical properties and chemical compositions of reinforcing bars . 5
7.1.2 Mass . 6
7.1.3 Dimensions . 6
7.1.4 Concrete strength . 6
7.2 Test data recording . 6
7.2.1 Test time . 6
7.2.2 Cracks record . 6
7.3 Breaking of specimens . 7
7.3.1 General. 7
7.3.2 Mechanical properties . 7
7.3.3 Mass . 7
7.3.4 Dimensions . 7
8 Test result . 8
8.1 Mass loss rate of test bar . 8
8.2 Average mass loss rate of test bar . 8
8.3 Ratio of the mass loss rate of the benchmark bar and the test bar. 8
8.4 Average ratio of the mass loss rate of the benchmark bar and the test bar . 8
9 Test report . 9
Annex A (informative) Examples of experimental results .10
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 156, Corrosion of metals and alloys.
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 2020 – All rights reserved

Introduction
Structurally deficient concrete is caused by deterioration due to corrosion, mainly induced by chlorides
from de-icing salts and marine exposure. The structural durability of concrete has become an issue of
common concern to engineering.
The high humidity and high salt spray characteristics of the marine environment need higher durability
structures. More specific requirements for the corrosion-resistant properties of reinforced steel bars,
as well as the corresponding testing technology requirements, have been put forward.
In consideration of engineering practices, corrosion properties could be predicted on the basis of
testing the corrosion rate via the comparative test of the steel bar specimen and a reference steel bar
specimen. This document is consistent with the actual conditions of concrete structure exposure and
can provide support for the development and selection of corrosion-resistant steel.
INTERNATIONAL STANDARD ISO 21062:2020(E)
Corrosion of metals and alloys — Determination of the
corrosion rates of embedded steel reinforcement in
concrete exposed to simulated marine environments
WARNING — This document does not purport to address all of the safety concerns, if any,
associated with its use. It is the responsibility of the user of this document to establish
appropriate safety and health practices.
1 Scope
This document specifies the apparatus, materials, specimen preparation, procedures, results and
reports for comparing the corrosion rates of steel reinforcement bars in concrete in simulated marine
and coastal environments.
This document is not applicable to galvanized steel reinforcement. It gives guidelines for material
selection in corrosion design.
In order to illustrate the methodology, Annex A provides examples of experimental results.
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 1920-3, Testing of concrete — Part 3: Making and curing test specimens
ISO 1920-4, Testing of concrete — Part 4: Strength of hardened concrete
ISO 3673-1, Plastics — Epoxy resins — Part 1: Designation
ISO 6935-2, Steel for the reinforcement of concrete — Part 2: Ribbed bars
ISO 8407:2009, Corrosion of metals and alloys — Removal of corrosion products from corrosion test
specimens
ISO 22965-1, Concrete — Part 1: Methods of specifying and guidance for the specifier
ISO 22965-2, Concrete — Part 2: Specification of
...