Advantages

1. deflection due to loading caused opponents little deflection of prestressing force.
2. in topping so that the building becomes monolith.
3. short installation time, east and does not require a lot of scaffolding.
4. eliminating formwork.
5. below the exposed surface so that it can be directly used as ceiling.
6. reduce material needs about 50% of the concrete structure and 100% of the tensile reinforcement under.