Concrete has always been used as a building material because of its high compressive strength, good durability and low cost.However, the fatal weakness of concrete is its brittleness and limited tensile strength.This problem was solved a century ago after the use of reinforced steel (rebar).Spiral steel is efficient in function and relatively cheap, so it performs well in most cases.However, rebar has its own weaknesses: susceptibility to corrosion (oxidation), exposure to salt, corrosive chemicals and water.Because it is corroded, the reinforcement expands and the concrete increases the pressure, beginning to crack and peel, forming holes that accelerate steel and concrete damage.This requires costly repair and maintenance, and if not repaired, it can damage the entire structure.Numerous coatings and permeators have been used for decades to help prevent moisture, or to upgrade concrete and steel itself with epoxy or stainless steel.But it also does not prevent corrosion in the long term.In addition, steel's penchant for conducting electric and magnetic fields makes it specifically undesirable in certain electrical, medical/scientific imaging, nuclear and electrical/electronic applications.

FRP reinforcement has many advantages in the construction field.First of all, the FRP reinforced bar will not rust or corrosion, so it is very suitable for regular or long-term immersion in fresh water or seawater, such as retaining wall, wharf and breakwater, wharf, caisson, deck, pile, bulkhead, canal, offshore platforms, swimming pool and aquarium.Also the immune and other de-icing salt chemicals, make the grade highway, Bridges, parking structure, airport runway, jersey barrier, retaining wall and the foundation, shoulder, guardrail, more durable and floor tile.In addition, it provides resistance to wastewater treatment plants widely, the field of solid waste, petrochemical plants, pulp and paper mills, pipes, tanks, cooling towers and other chemicals found in the chimney, and the concrete itself, alkaline environment.

Another advantage is that the tensile strength of FRP bars is usually 1.5 to 2 times higher than that of steel, so this is a good balance for the compressive strength of concrete.It also provides good fatigue resistance and is therefore suitable for cyclic loading (such as those for roads and Bridges).In addition, composite reinforcing bars are a quarter of the same weight as steel.It reduces the need for construction workers to carry and install heavy lifting equipment such as cranes with less wear and tear.It can be cut off with a regular cutting tool without damaging the saw blade.Each truck can carry more fiberglass material without exceeding the legal load limit.In Bridges and similar structures, high strength - weight ratios are provided to reduce the size and weight of the entire structure or to provide greater carrying capacity.Composite steels can also be used in soils with poor load-bearing properties, seismically active locations or in environmentally sensitive areas where heavy equipment cannot reach them.