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RE: Closure Pour versus Construction Joint

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Thanks Regis.


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From: "Regis King" <steelfishes(--nospam--at)hotmail.com>
To: seaint(--nospam--at)seaint.org
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
special 
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
starts. 
  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
the 
cold joint from opening, but not usually much.  A closure pour is a gap
of 
usually about 3' the divides one pour from the next, usually used to
allow 
shrinkage to take place.  No rebar or PT can cross continuously from one

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

Regis

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