1. Round Bars (RB)
The round bar, or RB, is employed in construction works. 6 mm and 9 mm round bars are often applied as stirrups for beams and columns. 12 mm and above round bars are commonly used in concrete reinforcement and can be categorized as follows:
– RB6 (1/4″ Round Bar) is a round bar employed in structures that do not require heavy support. They are commonly used as stirrups for columns, beams, round bars, and deformed bars.
– RB9 (3/8″ Round Bar) is a round bar used in constructions that do not require heavy support. Its use is similar to the applications of RB6.
– RB12 (1/2″ Round Bar) is a round bar employed in general structures. It is commonly used in turning works such as bolts. However, due to its smooth property, it is not widely used in concrete adhesion works.
– RB19 is a round bar employed in road constructions.
– RB25 is a durable round bar that can withstand heavy loads. It is commonly used in stud bolts and turnbuckles when handling large signs and billboards.
Round Bar Standard
According to TIS 24-2559, SR24 round bars should have diameters ranging 6–25 mm. Standard SR24 round bars are 10–12 m long, with a yielding strength of no less than 2,400 kg per cm. They can be welded into desirable shapes and sizes for various usage. 6 mm and 9 mm round bars are often used as stirrups for beams and columns and 12 mm and above round bars are commonly used as concrete reinforcement.
According to TIS 24-2559, a deformed bar is made with a pattern of indentations or ridges that produce higher durability and create a better bond between the bar and the concrete. It is suitable for reinforced concrete structures that required powerful durability, such as office buildings, tall buildings, condominiums, concrete roads, bridges, and dams. The deformed bar can be categorized into three types based on its properties:
– SD30, SD30T is a steel with a yielding strength of no less than 3,000 kg per square cm.
– SD40, SD40T is a steel with a yielding strength of no less than 4,000 kg. per square cm.
– SD50, SD50T is a steel with a yielding strength of no less than 5,000 kg. per square cm.