Question 1

What is a rebar?

Accepted Answer

A rebar, short for reinforcing bar, is a steel rod used within concrete to provide tensile strength. Concrete resists compression but is weak in tension. By adding rebars, structures become more durable and better able to handle cracking, bending, and heavy loads.

Question 2

What are rebar shape codes?

Accepted Answer

Rebar shape codes, defined in BS 8666, standardise the bending and cutting of reinforcement bars for UK construction. They specify dimensions and angles to make sure bars fit accurately within the design. For example, Shape Code 11 is a standard straight bar with no bends, while Shape Code 21 has a single bend at a specified angle. These codes help reduce waste, improve fabrication accuracy, and maintain structural integrity on site.

Question 3

How do you prevent rebar corrosion?

Accepted Answer

Preventing corrosion involves maintaining adequate concrete cover, which shields the steel from water and chemicals. UK standards such as Eurocode 2 and BS 8500 specify minimum cover depths based on exposure classes. For example, internal dry environments may need 20 mm cover, while external or marine conditions may need 40–50 mm. Using corrosion-resistant steel grades or epoxy-coated bars also helps. Correct placement, vibration, and curing of concrete reduces air pockets and voids, limiting moisture and extending reinforcement life.

Rebars

3m x 16mm High Tensile Steel Reinforcing Bar (Rebar)

3m x 20mm High Tensile Steel Reinforcing Bar (Rebar)

3m x 10mm High Tensile Steel Reinforcing Bar (Rebar)