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Frequently Asked Questions
What are Fusion Bonded Epoxy (FBE) Coated TMT Rebars?
FBE Coated TMT Rebars are high-strength steel reinforcement bars coated with a layer of fusion bonded epoxy. This coating provides a protective barrier against corrosion, enhancing the durability of concrete structures.
Why is epoxy coating used on TMT rebars?
The epoxy coating protects the steel from corrosive elements such as moisture, chloride ions, and chemicals—especially in harsh environments like coastal areas, water treatment plants, or industrial zones.
How is the FBE coating applied?
The epoxy coating protects the steel from corrosive elements such as moisture, chloride ions, and chemicals—especially in harsh environments like coastal areas, water treatment plants, or industrial zones.
Where are FBE coated rebars typically used?
These rebars are ideal for use in:
- Marine and coastal structures
- Bridges and highways
- Dams and reservoirs and water treatment plants
- Chemical and industrial facilities
- Foundations in aggressive soils
When was epoxy-coated rebar first implemented?
Epoxy-coated reinforcing bars were first used in 1973 on the Schuylkill Bridge near Philadelphia, Pennsylvania.
In which applications can epoxy-coated rebar be utilized?
Epoxy-coated reinforcing bars are ideal for a variety of uses, including:
- Continuous reinforced concrete pavements
- Parking structures
- Marine piers and docks
- Water storage towers
- Structural columns and parapets
- Dowel installations
- Concrete repairs
Can epoxy-coated reinforcing bars be welded?
Yes, welding is possible. If the bars conform to ASTM A706 standards, they can be welded without preheating. However, bars that meet ASTM A615 standards may require preheating up to 500°F. After welding, any damage to the epoxy coating must be repaired using materials that comply with ASTM A775 (assumed correction from "ASTM A7").
How prevalent is the use of epoxy-coated rebar in bridges?
As of 2008, more than 60,000 bridges in the National Bridge Inventory included epoxy-coated reinforcing bars.
What are the advantages of using epoxy-coated reinforcing bars?
Structures incorporating epoxy-coated rebar typically have longer service lives compared to those using uncoated steel. Key benefits include:
- Corrosion protection, even in cracked concrete.
- Cost-effectiveness over the life cycle of the structure.
- Ease of identification during construction due to their distinct appearance.
Where can one procure epoxy-coated reinforcing bars?
These bars are readily available nationwide. There are currently 37 certified plants under the CRSI Fusion-Bonded Epoxy Coating Applicator Plant Certification Program.
Does the coating affect the bond with concrete?
No. The coating is rough-textured and designed to maintain or even improve the bond between the steel and the surrounding concrete.
How durable is the epoxy coating?
With proper application and handling, the FBE coating can last for decades, ensuring long-term protection and performance.
Can the coating be damaged during transport or bending?
Yes, but damage can be minimized through careful handling. Minor damages can be repaired using approved epoxy touch-up kits.
Are FBE coated rebars more expensive than regular TMT bars?
They are more expensive upfront but offer long-term cost benefits by reducing the need for structural repairs and maintenance.
Can these rebars be welded or bent?
They can be bent carefully. Welding is not recommended unless the epoxy coating is removed and reapplied after the weld.
How should FBE coated rebars be stored on site?
Store them on raised platforms away from direct sunlight, standing water, and mechanical damage. Use protective covers to prevent UV exposure and contamination.
