- Pulling on the reinforcement in a concrete beam before the concrete has been placed. The rods are thus under stress even before the load comes onto the bridge. As for post-stressed work, there is usually no visible indication in the finished bridge. The pre-stressing process means that when the member is complete and the pre-stressing forces removed, the rods return towards their former length, improving compressive loading on concrete otherwise in tension. This reduces the tendency to the formation of cracks on the tension face.
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