FRP reinforcement uses fiber-reinforced polymer materials, including GFRP and BFRP products such as reinforcing bars and mesh. These non-metallic products may be considered for concrete reinforcement where corrosion of conventional metal reinforcement is a design consideration. Related FRP products such as rock bolts are used in selected ground-support applications. Selection depends on reinforcement type, structural or ground conditions, installation requirements, and product configuration.
FRP Reinforcement Types
FRP (fiber-reinforced polymer) reinforcement uses continuous glass or basalt fibers embedded in a thermosetting resin matrix. Product forms include reinforcing bars, mesh, and rock bolts. Many linear FRP products are manufactured by pultrusion. GFRP and BFRP reinforcing bars are generally linear elastic and do not exhibit steel-like yielding, so their structural design requires different considerations from conventional steel reinforcement. Surface deformations and coatings can be used to modify the bond characteristics of FRP bars with concrete. Mechanical properties vary with fiber type, resin system, product form, and geometry.
Typical Applications
In concrete construction, FRP reinforcement may be considered for marine structures, bridge decks exposed to de-icing salts, chemical containment structures, and electrical substation foundations where corrosion of conventional metal reinforcement is a design consideration. Related FRP products such as rock bolts may be used in tunnels, slope stabilization, and other ground-support applications. Selection varies with structural or ground conditions, installation method, and product configuration.
Frequently Asked Questions
Can GFRP rebar be bent on site?
GFRP reinforcing bars are generally not field-bent like conventional steel rebar. Bent shapes are typically formed during manufacturing, while any field modification should follow the product-specific installation requirements.
Does GFRP rebar corrode?
GFRP rebar is non-metallic and does not undergo the electrochemical corrosion mechanism associated with steel reinforcement. Long-term performance can nevertheless be influenced by factors such as sustained loading, alkaline exposure, temperature, and the specific product configuration. These factors should be considered during design.
