GFRP rebar replaces steel reinforcement wherever corrosion, magnetic interference or a long maintenance-free life drives the design. These are the concrete structures it goes into.
About Our Product
Engineered GFRP Composites for Demanding Environments in Gandhinagar
Surolia Enterprises is a trusted manufacturer and supplier of GFRP Rebar Manufacturer in Gandhinagar, delivering corrosion-free composite reinforcement for infrastructure, marine and industrial projects.
GFRP rebar is a pultruded reinforcing bar made from continuous glass fibres bound in a thermoset resin matrix. The surface is sand-coated or ribbed so the bar develops bond with concrete in the same way deformed steel does.
Because the bar contains no steel, it cannot rust. Structures exposed to chlorides — coastal works, water-retaining structures, bridge and parking decks — avoid the corrosion-driven cracking and cover spalling that eventually forces repair of steel-reinforced concrete.
Design and detailing follow FRP-specific provisions rather than a one-for-one substitution of steel bars, since GFRP is stronger in tension but less stiff than steel.
It Includes-
- Does not corrode — no rust, no cover spalling
- Tensile strength typically 700–1,000 MPa
- Approximately one quarter the density of steel
- Electrically non-conductive and non-magnetic
- Sand-coated surface for concrete bond
- Supplied cut to length; bends moulded to bar schedule
Applications
Where GFRP Rebar Is Used
Why Composite
Advantages of GFRP Composites
Glass fibre and resin do not rust. In chloride-rich environments — coastal structures, water treatment tanks, de-iced roads — there is no rebar corrosion and therefore no concrete cracking or cover spalling.
Tensile strength typically ranges from about 700 to 1,000 MPa, well above the 500 MPa yield strength of conventional Fe500 steel rebar, allowing efficient reinforcement designs.
At roughly a quarter the density of steel, bars are carried and placed by hand. This cuts crane time, transport load and on-site labour, and speeds up cage assembly.
The bars are non-conductive and non-magnetic, making them suitable for MRI suites, substations, telecom facilities, railway signalling zones and any structure sensitive to electromagnetic interference.
Because the reinforcement does not degrade, structures avoid the repair and cover-replacement cycles that corroding steel forces. Higher material cost is offset over the life of the asset.
Material Comparison
FRP VS STEEL
Corrosion Behaviour
FRP does not corrode. Steel rebar rusts when moisture and chlorides reach it; the expanding rust cracks the concrete cover from within.
Weight & Density
FRP has a density of roughly 2.0 g/cm³ against 7.85 g/cm³ for steel — about one quarter the weight for the same bar size.
Tensile Strength
FRP bars reach roughly 700–1,000 MPa in tension, compared with a 500 MPa yield for Fe500 steel.
Stiffness (Elastic Modulus)
Steel is stiffer: about 200 GPa against 40–60 GPa for GFRP. Members are designed for deflection and crack width accordingly, per ACI 440 guidance.
Conductivity
FRP is electrically and thermally non-conductive and non-magnetic. Steel conducts both heat and electricity and interferes with magnetic fields.
Fabrication
Steel can be cut, bent and welded on site. FRP is cut on site with a diamond blade, but bends must be moulded during manufacture — bar schedules are finalised before production.
FAQ
Frequently Asked Questions
FRP (Fibre Reinforced Polymer) rebar is a reinforcing bar made from continuous fibres bound in a polymer resin matrix. When the fibre is glass it is called GFRP. The bar is produced by pultrusion and then surface-treated — sand-coated or ribbed — so it bonds with concrete in place of conventional steel reinforcement.
No. There is no steel in the bar, so there is nothing to rust. This is the main reason it is specified for marine and coastal structures, water and wastewater treatment plants, chemical plants and bridge decks exposed to de-icing salts, where corroding steel would eventually crack and spall the concrete cover.
In tension, FRP is stronger: typically about 700–1,000 MPa against the 500 MPa yield strength of Fe500 steel. It is, however, less stiff — the elastic modulus of GFRP is roughly 40–60 GPa compared with about 200 GPa for steel, and the bar behaves elastically up to failure rather than yielding. Members are therefore designed for deflection and crack width using FRP-specific provisions, not by substituting bars one-for-one into a steel design.
It can be cut on site with a diamond or carbide blade. It cannot be bent on site — bends are formed while the resin cures during manufacture. Stirrups, links and any bent bars must therefore be specified and produced to the bar schedule in advance. FRP also cannot be welded.
Material and testing requirements for glass-fibre bars are set out in ASTM D7957. Design and detailing of concrete reinforced with FRP bars is covered by the ACI 440 series of guidance. Project specifications in India may additionally reference the relevant BIS specification for FRP rebars.
Anywhere corrosion, electromagnetic interference or handling weight drives cost. Typical cases are coastal and marine works, water-retaining structures, bridge decks and parking decks, MRI rooms and substations, railway and metro works near signalling equipment, and tunnel soft-eyes where the reinforcement must later be bored through by a TBM — something steel cannot accommodate.
