TMT rebars are steel bars that are used for the construction of buildings and other concrete structures like bridges, dams, etc. Concrete has good compressive strength but poor tensile strength and that's why TMT bars are needed to reinforce the cement/concrete. The ribs on the surface of the TMT provides enhanced anchorage in concrete structures so as to hold it in the place and avoid slippage of the concrete materials form the reinforced bars.
What does TMT stand for?
TMT stands for “Thermo Mechanical Treatment”. It is manufactured by a quenching and tempering process which allows the outer surface to cool much faster than the inner core, making a temperature gradient from the bar axis to the fringe. This results in a harder martensitic outer surface while the inner core cools slowly resulting in the ductile inner core. This entire process increases TMT's tensile strength, weldability, and stress resistance.
What do the numbers on TMT bars denote?
There are different manufacturing grades like Fe- 450, 500D, etc. The number in these grades denotes the yield stress. Higher grade TMT's are more strong and so they are used for large construction such as roof and the lower grade TMT's are used for decorative construction like a balcony, fence, etc.
Advantages of using TMT
- Zero surface deformities
- Better load-bearing capacity
- TMT bars are ductile which allows more room for aesthetic designing of a structure.
- TMT bars possess high-stress yield and prove to be a boon for earthquake-prone areas.
- TMT bars have negligible surface flaws which make it corrosion resistant.
- The rib patterns on TMT bars bonds exceptionally well with the concrete/cement.
So it would not be far fetched to say that TMT is the best option for any kind of construction. And when it comes to TMT, GKTMT is the best option as it provides 20% additional strength to the structure as compared to ordinary steel bars.