Difference between pre- Tensioning & post tensioning

Question

Accepted Answer

Pre-tensioning is done before casting concrete while post-tensioning is done after casting concrete.

Pre-tensioning involves tensioning the tendons before the concrete is poured, creating compression in the concrete once it hardens.
Post-tensioning involves tensioning the tendons after the concrete has hardened, allowing for greater control over the amount of tension applied.
Pre-tensioning is typically used in precast concrete elements like beams and slabs, while post-tensioning is commonly used in bridges and parking structures.
Pre-tensioning requires special beds or forms to hold the tendons in place during concrete pouring, while post-tensioning uses ducts or sleeves to run the tendons through the concrete.
Both methods help to increase the strength and durability of concrete structures.

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