Three major types of reinforcement used in prestressing?

 Three major types of reinforcement used in prestressing are following:
➤ Spalling reinforcement
Spalling stresses are established behind the loaded area of anchor blocks and this causes
breaking away of surface concrete. These stresses are induced by strain incompatibility
with Poisson’s effects or by the shape of stress trajectories.

➤ Equilibrium reinforcement
Equilibrium reinforcement is required where there are several anchorages in which
prestressing loads are applied sequentially.

➤ Bursting Reinforcement
Tensile stresses are induced during prestressing operation and the maximum bursting stress
occurs where the stress trajectories are concave towards the line of action of the load.
Reinforcement is needed to resist these lateral tensile forces.