What is RCC and why TMT?

Reinforced Cement Concrete (RCC) Why TMT reinforcement bars

House is every common man’s dream. It is not just a shelter, but a place filled with fond memories. So every home must be durable and strong to withstand adverse conditions and protect the loved ones. Concrete is the most widely used material for constructing. It provides high compressive strength, but low tensile strength. Due to this factor, concrete would fail from tensile stresses. All concrete structures will crack to some extent, due to shrinkage and tension, therefore it needs reinforcement.

 

TMT Reinforced Cement Concrete (RCC)

 

Reinforced Cement Concrete (RCC) Structure

Normally the concrete’s low tensile strength is countered by including reinforcement having higher tensile strength. Such high tensile strength can only be achieved by steel rebars. The steel rebars are placed in and tied by wires. This structure is called a reinforcement cage. Now wet concrete is applied all on top of the steel cage. This concrete then hardens in a matter of hours to form a composite. This is called Reinforced Cement Concrete (RCC).

Today, every structure is constructed using Reinforced concrete because the building requires both tensile strength and compressive strength and concrete alone can only satisfy for compressive strength.

The arrival of TMT

Before the arrival of TMT steel bars, mild steel was used as reinforcement to concrete but the catch was that earlier types of steel bars had lesser tensile strength which was not sufficient for buildings that needed more strength. TMT steel rebars debuted with the grade Fe 415, where 415 denotes yield strength. The advantage of Fe 415 was that it provided the optimum tensile strength and ductility and by slightly changing its process, higher grades such as Fe 500, Fe 550, Fe 600 etc. could be made, however these higher grade steels have less ductility than Fe 415.

Why is TMT preferred?

TMT rebars are preferred because of their excellent tensile strength and ductility. What distinguishes TMT steel rebars is the process involved in producing it which are:

  • Quenching
  • Self Tempering
  • Annealing

When selecting the right TMT rebar, the right grade must be selected. There are TMT rebar grades that offer higher tensile strength but compromises on ductility, therefore when building homes always choose Fe 415 TMT rebar and choose higher grades only if the design specifies them.

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