ISO/PAS 5929:2025

Publicly
Available
Specification
ISO/PAS 5929
First edition
Corrosion of metals and alloys —
2025-08
Test and evaluation method for the
corrosion of steel bar embedded
in concrete structure exposed to
total corrosion zones in marine
environments
Corrosion des métaux et alliages — Méthode d'essai et
d'évaluation de la corrosion des barres en acier encastrées dans
des structures en béton exposées à des zones de corrosion totale
dans des environnements marins
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 Simulated marine environmental chamber .2
4.2 Environmental parameter control chamber .2
4.3 Atmospheric zone: Spraying device .2
4.4 Splash zone: Splashing device .3
4.5 Tidal zone: Tidal device .3
4.6 Immersion zone .3
4.7 Buried zone .3
5 Test materials . 4
5.1 Steel bar .4
5.2 Concrete .4
5.3 Industrial salt .4
5.4 Water .5
5.5 Chloride concentration and salt solution temperature .5
6 Preparation of specimens . 5
6.1 Rust removal of steel bar.5
6.2 Making concrete specimens .5
7 Test procedure . 6
7.1 Specimen placement .6
7.2 Maintenance .7
8 Measurement . 7
8.1 Initial performance measurement .7
8.1.1 Mechanical properties and chemical compositions of steel bars .7
8.1.2 Dimensions .7
8.1.3 3D scan model .7
8.1.4 Mass .7
8.1.5 Concrete strength . .7
8.1.6 Chlorine ion concentration .7
8.2 Periodic measurement .8
8.2.1 General .8
8.2.2 Measurement time .8
8.2.3 Mechanical properties and chemical compositions of steel bars .8
8.2.4 Dimensions .8
8.2.5 3D scan measurement .9
8.2.6 Mass .9
8.2.7 Chlorine ion concentration .9
9 Results . . 9
10 Evaluation . 9
11 Test report . 10
Annex A (informative) Example of test apparatus .11
Annex B (informative) Example of test results . 19

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
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of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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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
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iv
Introduction
Reinforced concrete structures worldwide face increasing durability deterioration, primarily driven by
environmental factors. In the marine environment, chloride-induced steel corrosion causes significant
structural damage. This phenomenon occurs across multiple exposure zones defined by elevation:
atmospheric, splash, tidal, immersion, and buried zones. Coastal infrastructure (e.g. docks, bridges, piers)
typically spans several such zones simultaneously.
Existing corrosion testing methods focus on single-directional chloride penetration within isolated zones
like the splash zone. While moisture fluctuations here accelerate corrosion, such unidirectional models
fail to replicate real-world multi-zone interactions. This oversight leads to incomplete corrosion resistance
assessments during material selection.
This document establishes a testing methodology that vertically and horizontally simulates chloride
migration along steel bars. By simulating worst-case conditions in all corrosion zones, the method facilitates
accurate corrosion distribution mapping (particularly chloride ingress), data-driven material selection for
extended service life, cost-effective design that avoids overprotection (e.g. excessive component thickness)
and accurate protection and repair along the length of concrete piers and columns. 3D scanning supplements
traditional measurements and enables non-destructive 3D corrosion mapping without structural
compromise.
This document proposes a device and a procedure to test the corrosion of steel bars in marine environments
at all corrosion zones. The method describes the dimensions, standard configuration methods and test
standard processes of standard components. The method should simulate the impact of different chloride
salt environments along the length of steel bars in reinforced concrete components. However, the actual
environment and test conditions differ widely, and this document cannot cover all possible scenarios. The
objectives of testing can be achieved according to the parameters set out in this document. However, other
methods exist, and users can choose test parameters based on their own situation.

v
Publicly Available Specification ISO/PAS 5929:2025(en)
Corrosion of metals and alloys — Test and evaluation method
for the corrosion of steel bar embedded in concrete structure
exposed to total corrosion zones in marine environments
1 Scope
This document specifies the apparatus, materials, specimen preparation, procedures, results and reports
for testing the corrosion test of steel bars. This document includes an evaluation method.
This document applies to reinforced concrete structures exposed simultaneously to atmospheric, splash,
tidal, immersion, and buried zones in marine environments.
NOTE Annex A provides test apparatus examples. Annex B illustrates test 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 1920-4, Testing of concrete — Part 4: Strength of hardened concrete
ISO 6935-2, Steel for the reinforcement of concrete — Part 2: Ribbed bars
ISO 8407, 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 constituent materials, production of concrete and compliance
of concrete
EN 197-1, Cement — Part 1: Composition, specifications, and conformity criteria for common cements
ISO 8044, Corrosion of metals and alloys — Vocabulary
ISO 21062, Corrosion of metals and alloys — Determination of the corrosion rates of embedded steel
reinforcement in concrete exposed to simulated marine environments
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following 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
simulated marine environmental chamber
sealed enclosure simulating all marine corrosion zones through controlled parameters

3.2
environmental parameter control chamber
auxiliary chamber regulating temperature, humidity, and chloride concentration
4 Apparatus
4.1 Simulated marine environmental chamber
The simulated marine environmental chamber shall be designed to simulate a marine environment with
all corrosion zones at different depths and heights, including the atmospheric zone, splash zone, tidal zone,
immersion zone and buried zone. The environmental parameters shall be set, monitored and adjusted.
The size and quantity of the test cells shall be
...