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Re: Slab Transition Detail

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As an addendum to Harold's post.......those wood floors were installed like cobble stones, end grain "up".  Extremely durable & absorbent.

After the war (WWII) my father worked in a machine shop & years later when I was old enough to understand he explained end grain vs side grain using this example.  The floor he was working on was at least 25 to 30 years old.

(Yeah, I know that's how I become a geek)

Anyway, as Harold stated, this was the floor of choice for machine shops / industrial spaces. 
If a block failed, split, could be easily replaced.


On 3/1/07, Harold Sprague <spraguehope(--nospam--at)> wrote:
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.

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.

Harold Sprague

>From: "Rich Lewis" < seaint04(--nospam--at)>
>Reply-To: <seaint(--nospam--at)>
>To: <seaint(--nospam--at)>
>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
>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
>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
>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.

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