Galvanized rebar is standard steel rebar coated with a layer of zinc to slow corrosion. The zinc coating provides a sacrificial protection layer, but it is still a coating over a corrodible steel core, and its protection diminishes as the zinc layer is consumed over time.
Feature Comparison
| Feature | GFRP Rebar | Galvanized Rebar |
|---|---|---|
| Corrosion Mechanism | Non-metallic - nothing to corrode | Zinc coating corrodes sacrificially before the steel core; protection is finite |
| Long-Term Protection | Consistent for the design life of the structure | Diminishes as the zinc coating is gradually consumed |
| Weight | Significantly lighter than steel | Same as bare steel plus a thin zinc layer |
| Handling / Cutting | Cuts easily with standard tools | Cut edges expose bare steel, reducing protection at cut locations unless treated |
| Cost | Higher upfront than galvanized steel | Moderate premium over bare steel |
Figures reflect typical published ranges for these material classes and can vary by manufacturer, grade, and diameter. Confirm exact specifications for your project with our team.
Which Should You Choose?
Galvanized rebar offers meaningful, but time-limited, corrosion protection since the zinc coating is a sacrificial layer that eventually depletes - and cut ends need extra care to maintain protection. GFRP rebar avoids this "protection budget" problem entirely because it has no metal core to expose, making it a stronger long-term choice for structures with very long design lives or difficult-to-maintain exposure conditions.
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