Pretensioning and post tensioning techniques
#1

Concrete in which there has been introduced internal stresses of such magnitude and distribution that the stresses resulting from given external loadings are counteracted to a desired degree. In reinforced concrete members the prestress is commonly introduced by tensioning the steel reinforcement.

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This internal stress is induced into the member by either of the following prestressing methods:
Pre-Tensioning : Apply prestress to steel strands before casting concrete;
Post-Tensioning : Apply prestress to steel tendons after casting concrete

http://frontdesk.co.in/prestress.html
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#2

Prestressed post tensioning concrete can create larger bigger span in lesser depth of beam and slab.
Typical span to slab depth ratios are :
In RCC 1 : 28
In PT 1 : 45
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