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RE: Concrete disintegration

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It is amazing how things like this can happen. Sometimes trucks are used for different purposes and then are not clean thoroughly before being used to transport something else (like your salt and sand possibility). I heard of a similar problem with fertilizer and concrete. A petrographic analysis would be in order.

Jim K.

PS Could a disgruntled worker have possibly taken a leak in the concrete mix? 


-----Original Message-----
From: Mike Livingston [mailto:mwlivingston(--nospam--at)hotmail.com]
Sent: Wednesday, April 23, 2003 2:13 PM
To: seaint(--nospam--at)seaint.org
Subject: Concrete disintegration


Yesterday I told my kids I crushed concrete with my bare hands.  It was less 
funny for the homeowners though.  I was called out to look at some homes 
where the basement walls and foundations were spalling, slumping, and just 
plain crumbling away.  The homes are many miles away from each other with 
the concrete supplier being the common factor.  Test cylinders from the same 
batch were recently tested with about 1/4 of the strength they had before.
We're going to take core samples, do a chemical analysis, and replace the 
foundation, but I'm curious as to what you think the supplier put into his 
concrete to have such devastating results a few months later?  (Seems salt 
instead of sand might do the trick...)  Does anyone have any reference 
materials they can aim me at?
Thanks,
Mike Livingston, SE, CE, P.Eng
mwlivingston(--nospam--at)hotmail.com





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