"Concrete is very weak in tension" Um...the load would be compression not
tension. and concrete blocks generally are about 15 PSI compression.. (This is
not to say they should be used as jack stands...cracks and damage can cause
week spots and when concrete fails under load, it's not graceful!) The face of
the block has a center supporting perpendicular.... it is weaker than the
adjacent face but ...
Just palying devil's advocate... :o)
Dan
-----
Original Message ----
From: David Ramsey <dwramsey@att.net>
To: Tim Collins
<thcollin@mtu.edu>
Cc: spridgets@autox.team.net
Sent: Sun, January 10, 2010
4:55:51 PM
Subject: Re: [Spridgets] Jackstands
Who cares by the time the
cinder blocks fail, you're down the road with your
new set of wheels and
tires.
Crash
Finally, don't ever use a concrete block as a jack
stand. Concrete is
very weak in tension and will fail suddenly under a
relatively small
load. When loaded on the face of the block the concrete is
in tension.
Tim Collins
http://www.flickr.com/photos/12702006@N07/
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