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Re: Concrete Freezing

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	No; it was actually in Calgary and it happened late Saturday afternoon
so there were no people on site to be injured.  For this we were all
very thankful; it could have happened during a work day and several
people could have been injured or killed.

	We did loose quite a bit of sleep that night; we were up half the night
checking calculations and drawings to see if we might have made a
serious mistake; but we had not.  And for that we were also thankful.


				H. Daryl Richardson

Rhkratzse(--nospam--at) wrote:
> This sounds suspiciously like a building on Commonwealth Road (Street?)
> in/near Boston.  Is it?  In any case that one came down so straight it didn't
> touch an adjacent building only yards away from it.  And the only fatalities
> were several plumbers who went in to recover their tools just before it came
> down.
> Ralph Hueston Kratz, S.E.
> Richmond CA USA
> In a message dated 12/5/01 12:49:20 PM, h.d.richardson(--nospam--at) writes:
> << 1.)  On a 16 story building, the roof slab (flat plate, approx. 6" thick)
> was cast New Years Eve, about 1970 (party time, insufficient attention
> to hoarding and heating).  This was a government owned project; the
> owner had a full time inspector on site to monitor construction.  The
> temperature went down below -20 F; and stayed cold until mid February.
> The forms were removed and everything seemed fine.  When it thawed out
> in February the slab collapsed!  Totally and completely!  It was mainly
> ice which had held it together for 6 weeks.  The concrete behavior was
> not unlike soft coal; with effort some of the pieces could be broken BY
> HAND!  Needless to say the inspector and the site superintendent were
> both removed from the project; one summarily, and the other discretely.

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