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RE: Post-tensioned slab on grade

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If it is unbonded. (Which it probably is)
1.  Chip out a window exposing the strand.
2.  Heat the strand in the middle to relieve the tension. 
3.  Cut the strand after the stress is relieved.
4.  Re-tension and re-anchor the strand at the edge of the new opening.
5.  Dress out the cut at the perimeter.

Harold Sprague
The Neenan Company

-----Original Message-----
From: Juan C. Gray [mailto:juangray(--nospam--at)]
Sent: Thursday, November 05, 1998 11:55 AM
To: seaint(--nospam--at)
Subject: Re: Post-tensioned slab on grade

We recently built an 8" thick post-tensioned slab on grade , with
overall dimensions 120 by 90 feet. The active reinforcement is 1 strand
with 1/2" dia. every 2 feet, in both directions and placed in the middle
depth of the slab.
Now the owner needs two openings of 3 by 8 feet along the edges of the
I am worried  about cutting the tendons to make room for these openings,
because I'm not sure if the release of energy when I cut them may damage
the slab. Does anyone have any suggestion ?

Juan Carlos Gray