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RE: Difference between Initial Prestressing force and Jacking for ce

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Typically the tendons are stressed on the order of two to three days after pouring, the earlier the better.  Requests for over three days should be denied.  Concrete strength should be on the order of 2500-3000psi before stressing.  SureLock anchors have been successfully tested down to as low as 2000psi but this is not recommended. 
 
Nick Blackburn
 
-----Original Message-----
From: ken kirkland [mailto:kenmail234(--nospam--at)yahoo.com]
Sent: Friday, March 14, 2003 8:55 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Difference between Initial Prestressing force and Jacking for ce

Does anyone know WHEN the prestressing force can be applied by the contractor after the concrete was placed?