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Re: Steel Terminology

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As both Harold and Gail have pointed out, a "pin-wheel" column isolation
joint has been around for quite a while.  It is detail that I have used
very often.  One definite advantage is that it keeps possible vertical
movement between the concrete associated with the column vs. the concrete
with the rest of the slab right up next to the column.  This presents less
of a trip hazard and change in elevation that can cause trouble with
architectural elements (i.e. walls)...not to mention that the old diamond
and circle isolation joints can be an eye soar for various reasons.


Adrian, MI

On Mon, 3 May 2004 Mlcsey(--nospam--at) wrote:

> I am not aware of anyone doing this for steel columns, filling the area
> between the steel flanges and then wrapping the column prior to placing the
> slab-on-grade.  My understanding of the standard of practice is to leave a block-out
> around the entire steel column (a diamond or circle shape as viewed in plan
> looking downward), place the slab-on-grade and after the structure is fully
> loaded (dead load for all floor levels above has been placed) then pour in the
> blockout around the column. The blockout is poured monolithic, pouring inbetween
> the steel column flanges as well as the entire block-out. The concrete surface
> can be tooled to help control shrinkage cracks, but I haven't seen anyone do
> this for steel columns. They just live with any cracking that might occur.
> When its a square or rectangular concrete column I have seen contractors tool in
> a crack control joint (recess) at a diagonal to the four corners of the
> column (It is about 50-50 wheather the contractor places the crack control joints
> from the four corners of the column in the block-out).
> Mike Cochran S.E.
> In a message dated 5/3/2004 1:25:03 PM Pacific Standard Time, GSKWY(--nospam--at)
> writes:
> I am reviewing something that makes the following statement about placing
> concrete for a slab on ground around steel columns.  It doesn't sound quite right
> to refer to a column as a steel 'I' beam.  What's a better way of saying
> this?
> "If the column is a steel 'I' beam then the concrete in the area between the
> flanges should be placed first and wrapped with the isolation material before
> the slab is placed."
> Gail Kelley

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