GFRP and CFRP are both FRP composites, but they use different reinforcing fibers - glass for GFRP, carbon for CFRP - which changes their strength, stiffness, and cost profile significantly.
Feature Comparison
| Feature | GFRP Rebar | CFRP Rebar |
|---|---|---|
| Reinforcing Fiber | Glass fiber | Carbon fiber |
| Tensile Strength | High (typically 1000+ MPa) | Very high, generally exceeding GFRP |
| Elastic Modulus (Stiffness) | Lower (~45-60 GPa) | Much higher, closer to or exceeding steel |
| Material Cost | Lower cost, most widely used FRP rebar type | Significantly more expensive than GFRP |
| Electrical Conductivity | Non-conductive | Carbon fiber is electrically conductive, unlike glass fiber |
| Typical Use Case | General concrete reinforcement across most structures | Structural strengthening/repair (e.g. bonded strips) and specialized high-stiffness applications |
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?
GFRP rebar is the practical, cost-effective choice for the vast majority of concrete reinforcement applications. CFRP rebar offers higher strength and stiffness but at a substantially higher cost and with electrical conductivity that removes one of FRP's key advantages - so it is generally reserved for specialized strengthening or high-performance applications where its properties justify the premium.
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