FRP reinforcement includes GFRP and BFRP rebar, mesh, and rock bolting systems. These products provide non‑metallic, non‑corrosive reinforcement for concrete and ground support. Design of concrete elements with FRP bars references ACI 440.1R. Ground support applications require evaluation of stratum shear strength and installation torque limits.
What is FRP Reinforcement
FRP reinforcement is made by pultrusion, embedding continuous glass or basalt fibers in a thermosetting resin. Products include rebar, mesh, and rock bolts. The bars are linear elastic and do not yield, which requires different design approaches compared to steel. Surface deformations or coatings improve bond with concrete. Rock bolts use similar FRP materials for corrosion‑resistant ground support. The specific mechanical properties depend on fiber type, resin, and product form.
Typical Environments
FRP reinforcement is used in two broad areas. In concrete construction, it is commonly considered for marine structures, bridge decks exposed to de‑icing salts, chemical containment, and electrical substation foundations. In ground support, it is used for rock bolts and anchors in tunnels, slope stabilization, and foundation support.
Frequently Asked Questions
Can GFRP rebar be bent on site?
No. FRP rebar cannot be bent after production because the fibers would fracture. Bent shapes must be produced during manufacturing as custom pieces. Field modifications should be avoided.
Does GFRP rebar corrode?
GFRP rebar does not corrode like steel because it contains no metal. However, long‑term performance can be affected by sustained load, alkaline environment, and temperature. These factors should be considered during design.
