Developments on GFRP Rebar as Internal Reinforcement

Developments on GFRP Rebar as Internal Reinforcement

Over the last two decades, fiber reinforced polymer (FRP) concrete reinforcing bars have been tested and investigated extensively. As a result, we can find a variety of commercially available FRP bars. TUF-BAR GFRP rebar, for example, is one of the finest concrete reinforcement products available in the composite market. Unfortunately, many practicing structural engineers are unfamiliar with the use of GFRP bars as internal reinforcement in concrete structures. The blog post will discuss the efforts made on the evaluation of GFRP bars as internal reinforcement in concrete slabs, columns and beams.

FRP composites have gained a growing worldwide acceptance in the construction industry. These materials are designed using strong fibers embedded within a light polymer matrix. Composite materials have become popular because of their attractive properties: high tensile strength, corrosion resistance, environmental stability, and excellent bond strength.

It is highly recommended to use GFRP for structures that operate in severe environmental conditions. Currently, the corrosion of steel reinforcement in waterside concrete infrastructure has been a major concern. The construction industry has already tried many techniques to overcome steel corrosion, but these techniques always proved to be expensive short-term solutions.

GFRP rebar as beam reinforcement

An experimental comparison was conducted between the deformed steel bars and the composite bars in terms of load carrying capacity, cracking behavior, flexural rigidity, and strain distribution. The results concluded that there was a perfect bond between composite bars and the concrete and that the strength of GFRP reinforced beams was greater than that of beams reinforced with steel.

GFRP rebar as column reinforcement

The behavior of GFRP bars as longitudinal reinforcement for concrete structures has been investigated in a number of studies. It has been established that GFRP transverse reinforcement can increase the toughness, strength, and ductility of the column due to the effective confinement of the concrete core.

The strength of GFRP reinforcement

In 2004, ISIS Canada conducted a study on the durability of GFRP reinforcement in concrete. Concrete structures in service for 5 to 8 years were considered for the study. All the chosen concrete structures have been subjected to harsh environmental conditions. The study concluded that there was no sign of deterioration of the GFRP in the structures exposed to the corrosive environment for up to 8 years.

The study further revealed that de-icing salts, freeze-thaw cycles, and wet-dry cycles have no adverse effect on the reinforcement. Since fiberglass rebar requires minimum maintenance, structures built with GFRP reinforcement are likely to achieve service life of up to 100 years. The incredible results produced by GFRP rebar provided the authorities with confidence to allow the use of GFRP as primary reinforcement of concrete structures.

The use of FRP composite materials should be encouraged to get rid of expensive and widespread steel corrosion and rehabilitation. The construction industry has to adopt corrosion-free construction solutions in order to build a better future. TUF-BAR, a leading GFRP fiberglass rebar manufacturer in North America, strives to produce rust free, strong, and durable construction materials for a number of diverse construction applications. Visit our site to know more about our products.