Although the use of carbon steel rebar is sufficient in many construction projects, in some cases, concrete cannot provide sufficient natural protection. This is particularly true for marine environments and environments where deicing agents are used, which can lead to chloride induced corrosion. If stainless steel threaded steel bars are used in such environments, although the initial investment is high, they can extend the lifespan of the structure and minimize maintenance needs, thus reducing long-term costs.
Why use stainless steel rebar?
When chloride ions penetrate into carbon steel reinforced concrete and come into contact with carbon steel, carbon steel rebar will corrode, and the corrosion products will expand and expand, causing concrete cracking and peeling. At this time, maintenance must be carried out.
Carbon steel rebar can only withstand up to 0.4% chloride ion content, while stainless steel can withstand up to 7% chloride ion content. Stainless steel improves the service life of the structure and reduces maintenance and repair costs
What are the benefits of stainless steel rebar?
1. Has high resistance to chloride ion corrosion
2. Not relying on the high alkalinity of concrete to protect steel bars
3. Can reduce the thickness of the concrete protective layer
4. No need to use concrete sealant such as silane
5. The mixing of concrete can be simplified to meet the needs of structural design, without considering the protection of steel bars.
6. Significantly improve the durability of the structure
7. Significantly reduce maintenance and repair costs
8. Reduce downtime and daily maintenance costs
9. Can be selectively used for high-risk areas
10. Ultimately recyclable for regeneration
When does stainless steel rebar need to be used?
When the structure is exposed to high chloride ions and/or corrosive industrial environments
Roads and bridges using deicing salts
When it is required (or desired) that the steel rebar is non magnetic
Where should stainless steel rebar be used?
Stainless steel rebar should be considered in the following situations
1. Corrosive environment
Anchorages for bridges, docks, trestles, breakwaters, seawalls, light columns or railings, highway bridges, roads, overpasses, overpasses, parking lots, etc. in seawater, especially in hot climates
2. Seawater desalination plant
3. Sewage treatment facilities
4. Long life building structures such as the restoration of historical buildings and storage facilities for nuclear waste are required
5. Earthquake prone areas, as reinforced concrete structures may collapse during earthquakes due to corrosion
6. Underground passages and tunnels
7. Areas that cannot be inspected or maintained for repair
How to use stainless steel rebar?
In foreign countries, stainless steel rebar is mainly manufactured according to the British standard BS6744-2001 and the American standard ASTM A 955/A955M-03b. France, Italy, Germany, Denmark, and Finland also have their own national standards.
In China, the standard for stainless steel rebar is YB/T 4362-2014 “Stainless steel rebar for reinforced concrete”.
The diameter of stainless steel rebar is 3-50 millimeters.
Available grades include duplex stainless steel 2101, 2304, 2205, 2507, austenitic stainless steel 304, 316, 316LN, 25-6Mo, etc
Post time: Jul-25-2023