At first glance, all the TMT bars may seem the same. But that is only to the common people’s eyes. In reality, there are various types of TMT bars that are used depending on the construction. This variety of TMT bars is only known to the experts in this field like engineers, contractors or TMT dealers. Some rebars are suited for taller buildings, some might be for bridges or some are for small houses. There are different TMT sizes that are used in different areas depending on the environmental condition. But rest assured! All of these different aspects of TMT bars will be addressed in this blog, let us together explore all the various options of TMT bars.
Different Types of TMT Bars Based on Manufacturing
The type of TMT bars plays a huge role in what type of construction they will be used. Especially, there are different specialized TMT steel bars. They have various special quirks that are used in different scenarios. For example, corrosion-resistant TMT bars, are coated with epoxy or zinc. Then we have earthquake-resistant TMT bars that have high ductility and low-carbon TMT bars, as the name suggests, they have reduced carbon content. On the other hand, we have high-strength TMT bars that have 700 MPa or higher yield strength. Finally, weldable TMT bars which have special coating for easy welding.
Types of TMT Bars Based on Grade
The grade of a TMT bar plays an important role in what type of TMT bar will be used. Starting with Fe 415 Grade (Basic grade), they have a yield strength of 415 MPa and elongation of 15%. This TMT bar is used mainly in residential and commercial buildings, bridges, and industrial structures. Particularly for their biggest feature of a good balance of strength and ductility. Next, we have Fe 500 Grade (Mid-grade), which carries an elongation of 12% with a yield strength of 500 MPa. This TMT bar is widely suitable for high-rise buildings, heavy-duty industrial structures, and seismic zones. This is because they have a higher strength than Fe 415, making them ideal for demanding applications.
Another strong TMT bar is Fe 550 Grade (High-grade), with a yield strength of 550 MPa and elongation of 10%. What makes them ideal for heavy loads is their exceptional strength, but the elongation is relatively lower. They are primarily used in specialized structures like nuclear power plants, offshore platforms, and bridges in extreme conditions. Finally, we have Fe 600 Grade (Premium grade), they are primarily used in pre-stressed concrete structures thanks to their yield strength of 600 MPa and elongation of 8%. Due to this, these TMT rebars are limited to very specific applications due to their extremely high strength and low ductility.
Based on TMT Size
Grades and manufacturing types are not the only ones, TMT size and surface texture also make a lot of difference. For example, we have 6mm to 12mm (small diameter) TMT rebars, which are ideal for reinforcing the foundation, columns, beams, and slabs in residential construction. Next, there are 12mm to 25mm (medium diameter) TMT bars, used for shopping malls, office complexes, and industrial buildings. Lastly, 25mm to 40mm (large diameter) TMT bars, are primarily used in Bridges, Highways, Tunnels, Dams, High-rise buildings, Industrial complexes etc.
Conclusion
Today we have explored only a fraction of the different types of TMT bars. For example, surface texture also has an important like in plain TMT bars. Which are generally used in construction where the ribbed pattern is not crucial for bond strength between steel and concrete. They are implemented in the construction of warehouses, factories etc. Ribbed TMT bars, which have ribs, or protrusions, on their surface, serve a vital purpose in enhancing the bond between the steel and the concrete. Used in bridges, dams, tunnels, and highways that rely on these bars to withstand the immense forces they encounter. But there are many more, which we will discuss at a later time.
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