Quote:
Originally Posted by Zerton
Concrete works great in compression, but is pretty bad in tension. Basically you can place a lot of weight on a concrete column, but if you were to hang a concrete column from the ceiling you wouldn't be able to hang nearly as much weight from it.
The steel rebar both holds the concrete slab in compression and adds tensile strength to the slab.
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Rebar takes the tension - concrete takes the compression.
Post tension puts the concrete under compression making it stronger.
in this photo you can see both the rebar (vertical, and horizontal at right angles) and the post tension cables (running diagonally).
