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Re: Concrete Freezing

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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)shaw.ca 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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