India's Highway Boom and the Corrosion Problem
India's NHAI is on an unprecedented road construction spree. But TMT steel carries a hidden liability: corrosion.
IRC 37 and GFRP Rebar
The Indian Roads Congress published IRC 37 guidelines accommodating FRP bars for road reinforcement. GFRP rebar can now be specified for concrete road slabs, bridge deck overlays, culverts, median barrier walls, and retaining walls.
Why GFRP Makes Sense for Roads
- No corrosion from road salts — GFRP is completely immune
- Lighter slabs — 75% lighter than steel, reducing foundation loads
- Non-conductive — ideal near toll plazas and EV charging infrastructure
- No magnetic interference — does not affect inductive loop traffic detectors
Cost Analysis for Road Applications
For a 4-lane highway over 1km: GFRP material cost ₹38–46 lakh vs TMT ₹47–51 lakh — competitive at material level, before lifecycle savings.
Conclusion
GFRP rebar under IRC guidelines and IS 18256:2023 is ready for mainstream NHAI adoption. RN Elements in Surat supplies highway-grade GFRP with full documentation.