What is rebar and why is it used in construction?

In general, the compressive strength of concrete is very high, and we need an extremely strong force to crush it. Meanwhile, concrete has a relatively weak tensile and torsional strength. For this reason, to increase its tensile and torsional strength, various types of rebar are used, especially ribbed ones.

Rebar was first used in France in the early 19th century. At that time, concrete alone was not enough to build large and strong structures. By increasing the tensile strength of concrete, this section made it possible to build large concrete structures such as bridges, tall buildings and dams.

Know the types of rebar!

Construction rebars are classified based on parameters of appearance, material, standard and application. Each of these categories has various sub-categories that we explain below.

1) types of rebar based on appearance (bricked and plain)

Rebars are divided into two categories, simple and ribbed, based on their appearance, which is the most important factor. Ribbed rebar has grooves that increase the adhesion of the rebar to concrete; For this reason, it increases the resistance of the concrete structure against tensile forces. This reinforcement is the most widely used type of rebar in building construction.

Unlike the ribbed type, plain rebar does not have grooves. This reinforcement is used for cases where high adhesion of rebar in concrete is not needed (for example, in connections between beams and columns).

Ribbed and plain rebar each has its own use. Choosing the right type of rebar for a concrete structure should be done according to various factors such as the type of structure, environmental conditions and incoming loads. Ribbed rebar has higher tensile strength than plain rebar. Treads increase the contact surface between rebar and concrete, therefore, the resistance of the concrete structure against tensile forces increases.

Simple rebar is more malleable than ribbed. This is simple due to the absence of treads on the surface of the armature. Ribs increase the rigidity of the rebar, and for this reason, the ribbed rebar is less deformed.