How do post tension cables work? They aren’t springy but once the concrete sets if you cut one they spring up and it’s not a good time.
In: Engineering
Concrete is really weak if you pull it (tension) and strong if you push it (compression).
The steel is placed while being pulled like a spring (tension) and the concrete sets around it. The steel wants to return to its original shape so it pushes on the hardened concrete (compresses it) providing strenth.
If you remove the concrete, the metal is already pulled like a spring and can release that energy.
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