ISO 21062:2020 pdf download Corrosion of metals and alloys — Determination of the corrosion rates of embedded steel reinforcement in concrete exposed to simulated marine environments
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 constituent materials, production of concrete and compliance of concrete
EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
breaking of specimens
separation of specimens (which are steel reinforcement bars that have been encased in concrete) into fragments using a hammer or similar tools and then taking out the bars
4 Apparatus
4.1 Simulation chamber.
The simulation chamber shall be designed so that the test conditions can be obtained and controlled during the test. The simulation chamber shall be such that the conditions of homogeneity and distribution of the spray are met. A typical design of simulation chamber is shown in Figure 1. The placement of the concrete specimens is shown in Figure 2.
The test is conducted in a temperature range (approximately 5 °C to 30 °C). In special cases, other test temperature ranges may be adopted by agreement between the parties.
4.2 Spraying device. The spraying device for the salt solution installed in the simulation chamber shall be capable of producing a fine mist or small droplets falling on the test objects. Salt (5.5) solution concentration: 3 % ± 0,2 %, initial pH 7 ± 0,5.
4.3 System for forced drying. The simulation chamber shall be equipped with a system for forced air flow drying, as after spraying/ wet stand-by all test objects should be dried and it shall be possible to regain environmental control within a reasonable time. The specimens are sprinkled every 12 h for 60 min ± 5 min. Then the ventilation system is turned on for 2 h to dry the specimens.
5 Test materials
5.1 Reinforcing steel.
The reinforcing steel shall have a diameter of 16 mm to be consistent with the dimensions of Figure 3.
5.2 Benchmark bar.
The benchmark bar is numbered as 0# with a length of 395 mm ± 2 mm. It shall be selected in accordance
with ISO 6935-2. B400DWR steel is recommended.
5.3 Test bars.
Test bars are numbered as 1#, 2# and 3#, with a length of 395 mm ± 2 mm.
5.4 Concrete.
B30 concrete shall be used in accordance with ISO 22965-1 and ISO 22965-2.
The standard cement used in this experiment shall conform to EN 197-1. CEM II/A Portland-composite cement is recommended with a strength class of 42.5. The aggregate shall be selected in accordance with ISO 22965-1 and ISO 22965-2. It is recommended to use approximately 5 mm to 10 mm gravels for coarse aggregate.
5.5 Industrial salt.
Industrial salt is used in the experiment.ISO 21062:2020 pdf download