Concrete that has been pretensio ned or posttensioned.

A development of ordinary reinforced concrete. The reinforcing steel is replaced by wire cables in ducts.

evolved from reinforced concrete by replacing the reinforcing steel with wire cables in ducts.

Concrete in which stresses have been introduced which are opposite in sense to those that the structural member will be expected to carry during its use.

Concrete in which the reinforcing cables, wires or rods in the concrete are tensioned before there is load on the member, holding the concrete in compression for greater strength.

Structural concrete in which internal stresses have been introduced to reduce potential tensile stresses in concrete resulting from loads.

Concrete which is stressed before it is cast.

Traditional reinforced concrete is based on the use of steel reinforcement bars, rebar, inside poured concrete.