One startup’s paper-thin stainless steel could change how bridges are built

image via TechCrunch

October 7, 2025, 3:40 PM

• •Rust in steel rebar causes premature failure of concrete structures, especially bridges.
• •Allium Engineering developed a stainless steel-clad rebar to combat corrosion.
• •The new rebar aims to be a cost-effective alternative to traditional methods like epoxy-coating.
• •The technology extends bridge lifespans and reduces the need for extra concrete.
• •Allium's product is currently being used in several bridge deck replacements.

Rust is a major problem for concrete structures, particularly bridges, leading to costly repairs and replacements. Allium Engineering is proposing a stainless steel-clad rebar as a cost-effective alternative to prevent corrosion and extend the lifespan of bridges. This innovative approach involves coating regular rebar with a thin layer of stainless steel, aiming to match or undercut the price of epoxy-coated rebar while eliminating the need for additional concrete and allowing for greener cement options. Allium's rebar has been successfully used in several bridge projects, offering a potentially more durable and economical solution compared to existing methods.

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