During placing the steel in RC structure if the required length of a bar is not sufficiently available to make a design length then lapping is done. Lapping means overlapping of two bars side by side to achieve required design length. This is less than an optimum solution as it wastes extra steel and creates comparatively a weak joint. A mechanical coupler is a better solution for joining rebars in concrete. Rebar couplers are designed to produce full strength of mechanical joints between reinforcing bars. It can connect rebars of same or different diameters laterally, vertically, slantingly. It is broadly applied in the Tunnel, Tower, Bridge, Subway, Airport, Nuclear Power station, High Rise Building, Reservoirs, Marine Structures etc
|Mechanical property||Yield Strength||Tensile Strength|
As its made of carbon steel naturally plain couplers are prone to corrosion under concrete application, to resolve this issue now-a-days epoxy coated couplers are used in place of plain couplers to protect against corrosion
Rebar coupler advantages:
1. Good performance of anticorrosion extends service lifetime effectively
2. Raw material saving, High energy saving, high work efficiency
3. High dimension precision, reliable quality and stable performance
4. Improved fatigue strength of the connection
5. Solves bar conjunction problem
As per Decision Database, The worldwide market for Rebar Coupler is expected to grow at a CAGR of roughly 5.3% over the next five years, will reach 1230 million US$ in 2023, from 900 million US$ in 2017.
Epoxy coated rebar couplers
Epoxy coated rebar couplers are more durable because of added corrosion protection and have enhanced fatigue life due to shot peening effect it gets during shot blasting of it while epoxy coating process.