Materials:
FRP rebars are primarily manufactured using the pultrusion process. Surface deformations patterns contribute to the bond to concrete are available as ribbed, sand-coated, and helically wrapped and sand coated. The most common fiber reinforcements are glass and carbon fibers. Resin systems used to protect the fibers from environmental attack are based on 50 plus years of rigorous corrosion applications.
 

Specifications
FRP rebars offer many advantages over other concrete reinforcing products. The properties of the FRP rebars are different from those of steel reinforcement. The design of concrete reinforced with FRP rebars is different in many cases. Design engineers should consider the appropriateness of reinforcing concrete with FRP rebars, keeping in mind the following basic points for design:
• Direct substitution of FRP rebars in concrete members designed with steel bars is not possible in most cases.
• Lower modulus of elasticity and shear strength of FRP rebars will limit the applications to short spans of secondary structural elements.
• Glass FRP rebar is limited to a maximum sustained stress of 20% of the guaranteed design tensile strength.
• Glass FRP rebar applications are limited to the reinforcement of concrete and are not to be used as a pre-stressing or post-tensioning element.
 

Set Backs:

There are certain setbacks in the use of these FRP reinforcements that are such as:

1. Cost of these reinforcements will be immense in mass works.

2. Glass FRP s can only take 20% of the tensile stress as compared with the steel reinforcements.

3. Designing structures specially for FRP s replacements would be another headache.

4. Bound between steel and concrete is natural but to make such an effective bound of concrete with FRS special ribs and others measures must  be carried out.

These are the points that make us think that in spite of all FRP s advantages steel reinforcements will have their place in the construction industry.