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Politics : Politics for Pros- moderated

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To: John Carragher who wrote (359207)	4/13/2010 7:48:24 AM
From: alanrs	Read Replies (2) of 793958

Not necessarily. The type of construction they are apparently describing is called post tensioning. Steel cables (in greasy plastic sheaths) with 'shoes' on each end are rolled out with the rebar. After the concrete is poured, but before it fully cures, those cables are stretched and locked in place, compressing the concrete. Concrete is strong in compression but weak in tension. By compressing it in this manner it can be used in applications that involve tension, such as floors, which I'm reasonably sure is the case here. If the ends were not properly sealed and water was rusting out the locks (actually a couple of steel wedges at the cable/shoe interface) the cables could slip, releasing the compression on the slab. I'm a little surprised that water would get to this area once the skin is on, but it is Seattle. The crew that tensions the cables is often different from the crew that cuts the excess cable which is often different from the crew who would 'paint' the ends which is always different from the crew who would fill in the pocket with grout. Obviously, something fell through the cracks, but it need not have been nefarious. ARS

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