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RE: Slab Transition Detail

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Rich,
Any change in elevation (bump) will create an increase in local impact stresses. This will cause concrete erosion. Therefore avoid joints of all kinds. Where you can not avoid joints, armor the edge.

Armoring joint edges is done incorrectly more often than correctly. The easy way is to specify a PNA product.
http://www.pna-inc.com/products/armor_edge/index.html

It is also advisable to use a surface hardener.

The old fashioned way to avoid concrete surface degradation is to use wood blocking to protect the concrete surface. Back in the old days (1920's). Plants placed wood blocking on top of concrete surfaces. They used steel wheeled trucks to move parts from one place to another. These wood blocks lasted for over 6 decades at one General Motors plant of which I am aware. The wood blocked floors out lasted all of the steel wheeled trucks. .....amazing!!

Regards,
Harold Sprague





From: "Rich Lewis" <seaint04(--nospam--at)lewisengineering.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: Slab Transition Detail
Date: Thu, 1 Mar 2007 16:03:11 -0600

I have a condition where a steel plate will be embedded in a concrete slab.
The plate will be about 1/2" thick and provide a hard wearing surface for
solid aluminum wheels on a cart hauling heavy equipment. The dimensions are
10 ft. x 4 ft.



I am wondering about the edge condition of the plate and concrete.  The
wheels will roll over the edge from concrete to steel. Should this be given
special consideration?  Would there be a tendency of the concrete to spall
around the edge? Should a joint be put around the edge and filled with semi
rigid epoxy filler? Would that still tend to spall from the wheel load?
Would chamfering the edge of the plate help at all?



Thanks for your help.



Rich




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