In the world of construction, deformed bar is a common term being used. It is a steel bar derived from the deformed pattern that you can identify at the surface of the bar. These bars are available in several deformation patterns that can be used in structural elements based on construction requirements.
These bars are typically manufactured from high-strength steel to ensure strength and structural integrity. If you would like to learn more about this deformed bar, continue your reading. This article clearly uncovers its types, manufacturing process, and advantages.
What is a Deformed Bar?
A deformed bar is a steel bar, also known as a reinforcement bar or rebar. The primary duty of deformation is to increase the bond strength between reinforcement and concrete, ensuring a stronger and more durable structure. The name has been obtained from the deformed pattern on its surface, which also includes ribs or projections. It is made from high-strength steel, capable of withstanding significant loads.
Types of Deformed Steel Bars
Understanding the types of deformed steel bars will assist you in choosing the right one for your construction. Let’s have a look at them:
Hot Rolled Deformed Bars
Hot rolled deformed bars are often called TMT (Thermo Mechanically Treated) bars, used to build steel reinforced concrete structures. It is also a type of steel reinforcement bar made by a unique manufacturing process that involves hot rolling and controlled cooling. These rebars are superior in producing the combination of enhanced strength and ductility.
Cold Twisted Deformed Bars
Cold twisted deformed bars are popularly known as TOR steel in India. This is a type of high yield strength deformed steel bar that provides increased strength and ductility to the structures. It is made by cooling hot steel bars, which can be stretched and twisted at certain ambient temperatures to achieve the desired size and shape.
Sizes of Deformed Bars
Deformed bars are manufactured in several sizes that builders can use based on the construction requirements. However, the common sizes available in India, such as:
Diameter: 6mm, 8mm, 12mm, 16mm, 20mm, 25mm, 32mm, 40mm, 45mm, and 50mm.
Length: 300 mm, 600 mm, 6 m, 9m, and 12 m.
Grades of Deformed Bars
The grades of deformed bars are adhered to IS 1786:2008. Below is the combination of high-strength deformed bars and wires that must be used in RCC construction. It typically determines the strength and bond between concrete and reinforcement.
Fe 415, Fe 415D, Fe 415S
Fe 500, Fe 500D, Fe 500S
Fe 550, Fe 550D
Fe 600
Application of Deformed Bar
Deformed bars, also known as rebar, have been used in various construction applications based on the project requirements. They immensely contribute to improved strength and durability of the structures.
- Reinforced concrete structures: buildings, bridges, and dams
- Building concrete foundations
- Construction of hydraulic structures
- Construction of roads, tunnels, highways, water systems, and sewerage systems
- Reinforcing concrete columns
- Residential and commercial buildings
Cost of Deformed Steel Bar
In India, there are many manufacturers selling deformed bars. Based on the cost of resources and complexities in manufacturing, the price can vary from region to region. Herewith, the approximate cost is explained:
Round deformed bar: price ranges from Rs. 46 to 56/kg.
High-strength deformed bar: the price range is approx. Rs. 64000/metric tonne.
TMX 500 deformed bar: it costs Rs. 65,000/tonne.
Advantages of Deformed Bar
Deformed bars offer several advantages to RCC structures, including essential strength and durability. Let’s discuss the pros in detail:
- Enhanced ductility allows structures to withstand minor movements and deformations. This is particularly essential for the buildings that exist in seismic regions, where they need to tolerate natural disasters like earthquakes.
- Deformed bars improve the bond strength between concrete and reinforcement, preventing the occurrence and development of cracks.
- These steel bars are proficient in carrying the significant loads and prevent structures from experiencing significant failures or deformations.
- Deformed bars are available in variable sizes and lengths, suitable for use in various applications and load requirements.
Disadvantages of Deformed Bars
There are significant drawbacks to discuss regarding deformed bars, such as:
- As is known, rebar is a kind of steel bar that is prone to rust when it is exposed to oxygen and moisture. It may weaken the structural integrity and strength of the concrete.
- Steel is an expensive material, so the cost of deformed bars may significantly increase the overall construction budget.
- The production of steel contributes to significant energy consumption and greenhouse gas emissions.
Manufacturing Process of Deformed Bar
Here is the lists of manufacturing processes involved in deformed bars:
- The resources like limestone, iron ore, and coal are heated in a furnace to obtain molten steel. It is then poured into the molds and let it be cooled down to form solid billets.
- Such billets are reheated and rolled into thin, long bars.
- The next step in the deformation process involves passing the bars into machines to engrave the ribbed pattern over the surface.
- Allow deformed bars to cool down to achieve their desired strength and durability. After that, they are cut into the required size and length.
- At last, the quality of the bars is inspected and then packaged for shipment.
Deformed Bars in Sustainable Construction
Deformed bars have gained significant popularity in sustainable construction. They provide enhanced durability and longevity to the concrete structures. Here’s how:
- The ribbed pattern molded on the bar surface provides excellent mechanical bonding with concrete. They are fundamental to improving the overall strength and lifetime of the structure.
- The optimization of reinforcing and design requirements can reduce the amount of overall concrete and steel in your construction project.
- The enhanced strength and longevity of RCC structures reduce the need for frequent maintenance, leading to long-term cost savings.
- Deformed bars contain excellent seismic resistance that can protect the structure from damage due to earthquakes or harsh weather conditions.
Final Words
Deformed bars are widely used in the construction sector. It plays a vital role in many applications and can be personalised according to the project design and requirements. Thus, you can ensure the building needs are met and order raw materials accordingly.