* In the field of constructions, steel acts as a powerful structure, which creates a high strength, durability and stability. Steel is an alloy of iron and carbon and sometimes other elements. It is a low cost and a significant component used in buildings, infrastructures, tools, machines, appliances, etc.
* Steel being the most preferred choice for construction has great benefits. The buildings are made up of different types of steel, which forms a structural framing system, saves time and less expensive
* Steel reinforcement bars or rebars are used to improve the tensile strength of the concrete.
* Steel is only used as rebar because elongation of steel due to high temperatures (thermal expansion coefficient) nearly equals to that of concrete
Types of Steel Reinforcement Bars
* Major types of steel bars used in the construction
I.Mild Steel Bar
* The surface of the mild steel bars are plain and round in shape. They are available in various sizes of 6 mm to 50 mm. They are used in concrete for special purposes, such as dowels at expansion joints, where bars must slide in a metal or paper sleeve, for contraction joints in roads and runways, and for column spirals. They are easy to cut and bend without damage.
Grades in mild steel bars
1. Mild Steel Bars
Mild steel bars grade-I designated as Fe 410-S or Grade 60.
Mild steel bars grade-II designated as Fe-410-o or Grade 40.
2. Medium Tensile Steel Bars designated as Fe- 540-w-ht or Grade 75.
II.Deformed Steel Bar
Deformed steel bars have ribs, lugs and indentation on the surface of the bar, which reduces the major problem that is faced by mild steel bar due to slippage and good bonding is achieved between concrete and rebar. The tensile properties is higher compared to other rebars. These bars are produced in sections from 6 mm to 50 mm dia.
1. TMT Bars (Thermo Mechanically Treated Bars)
Thermo Mechanically Treated Bars are hot treated bars that are high in strength used in reinforced cement concrete (RCC) work. It is the latest induction in the MS steel bars with superior properties such as strength, ductility, welding ability, bending ability and highest quality standards at international level.
Characteristics of TMT Rebars
Better ductility and malleability
High yield strength and toughness
More bonding strength
Earthquake resistance
Corrosion resistance
High thermal resistance
Economical and safe in use
No loss in strength at welded joints
Ordinary electrodes used for welding the joints
2. High Strength Deformed Bars
High strength deformed bars are cold twisted steel bars with lugs, ribs, projection or deformation on the surface. It the extensively and majorly used for reinforcement purposes in a construction. These bars are produced in sizes or sections from 4 mm to 50 mm in diameter.
