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RE: Closure Pour versus Construction Joint

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Thanks Regis.

16                               Message:0016
From: "Regis King" <steelfishes(--nospam--at)>
To: seaint(--nospam--at)
Subject: Closure Pour versus Construction Joint

In case anyone wants a response from a cool-headed third party...

I can see where one would get the idea that a closure is merely a
kind of cj.  In PT design, though, the two mean different things.  A 
construction joint is a place where the pour stops, and another pour
  PT and rebar can cross this gap.  For PT, this is an intermediate 
stressing point.  There is generally a small amount of added bar to keep
cold joint from opening, but not usually much.  A closure pour is a gap
usually about 3' the divides one pour from the next, usually used to
shrinkage to take place.  No rebar or PT can cross continuously from one

side to the other, as that would prevent differential movement.  Rebar
be lapped across this joint.  As PT must anchor at each side without
through, there is general quite a bit of extra rebar, and the PT profile
impacted.  At some point, often 21 - 56 days, the closure is closed and
diaphgram become continuous.  Those are the standard uses of those words
I have seen them used.  In the real test of the definition, if you told
contractor to anticipate a construction joint, then later told the 
contractor that you specifically want a closure pour, they would regard
as a change, and a moderately expensive one with scheduling implications
that, not just as a more specific kind of the same animal.



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