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Re: cracking of concrete in post-tensioned slabs

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In a message dated 10/21/98 8:00:06 PM Pacific Daylight Time,
josediezpe(--nospam--at)hotmail.com writes:

<< 
 European codes limit the crack width. Here the code limits the tensile 
 stress to 12SQRTf'c as a max. 
 
 Jose Diez
>>

The basic tensile stress limit is 6SQRTf'c.  The 12SQRTf'c is only allowed
under certain conditions that have to be satisfied.

I believe, that most of the cracks in post tensioned slabs are caused by creep
and shrinkage, locked in stresses at wall and/or beam corners, pour strips
that were closed too early!!

Antonio S. Luisoni
Consulting SE