What is the purpose of the deformed rebar?

What is the purpose of the deformed rebar?

• A. Deformations improve the bond between steel and concrete
• B. To reduce weight
• C. To increase thermal conductivity
• D. To prevent corrosion

Answer: (A)

Deformations on rebar create a rough, ribbed surface that grips the surrounding concrete, producing a strong mechanical interlock. This bond isn’t just about adhesion; the ridges increase friction and prevent the steel from slipping inside the concrete as loads are applied. Because of this, the concrete and steel act together more effectively, allowing the tensile forces to be transferred from the steel to the surrounding concrete and improving pullout resistance and overall structural performance in bending and tension. These ribs are not meant to reduce weight, change thermal properties, or prevent corrosion—the last of those comes from coatings and proper detailing, not the deformations themselves.

Deformations on rebar create a rough, ribbed surface that grips the surrounding concrete, producing a strong mechanical interlock. This bond isn’t just about adhesion; the ridges increase friction and prevent the steel from slipping inside the concrete as loads are applied. Because of this, the concrete and steel act together more effectively, allowing the tensile forces to be transferred from the steel to the surrounding concrete and improving pullout resistance and overall structural performance in bending and tension. These ribs are not meant to reduce weight, change thermal properties, or prevent corrosion—the last of those comes from coatings and proper detailing, not the deformations themselves.