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cracking of concrete in post-tensioned s

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Your subject line indicates that you are concerned with cracking in 
post-tensioned slabs.  Since cracking is the result of tension in concrete, 
and post-tensioning is supposed to put concrete in compression, i.e., prevent 
tension in the concrete except under close to maximum loads, the cracking 
indicates that your post-tensioning is not adequately compressing the 
concrete, or your details are putting the concrete in tension (such as 
horizontally curved tendons at an edge pulling the concrete off the edge).

In a few words, Yes, you have a problem when prestressed concrete, either 
post-tensioned or pre-tensioned, cracks.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Chris Lillback wrote:

. > Question: What is the expected or allowable amount of cracking for 
. >         a slab before it becomes a structural problem?
. > From a structural engineering viewpoint not aesthetics.
. >