[Diy_efi] ever poured a large slab?

[bearbvd at mindspring.com]

Original Message:
-----------------
From: J M galaxiecustom500 at yahoo.com
Date: Fri, 20 Jul 2007 18:50:14 -0700 (PDT)
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] ever poured a large slab?


We just put new epoxy on the floors of the student
projects building at Ohio state.  Very nice.  Much
easier to clean up the floors/keep dust down when we
paint or do carbon fiber work.

Jason
http://www.youtube.com/watch?v=B04yzmGnvx0

--- Steve Ravet <Steve.Ravet at arm.com> wrote:

> I had some spalling on the 10x20 slab I did last
> year but didn't use
> anything like what you described.  Just screed, 3'
> float, then hand
> trowel.  What causes the spalling?

Adding too much (generally ANY) water to the mix before pouring, not enough
cement in the mix (never use less than six sack for flat work). Also-- if
the slab was poured under hot sunny, or windy conditions--the surface may
not have cured decently.
> 
> I think I've decided to do the forms myself and hire
> the concrete work.
> Or at least to call and get estimates.
> 
> How about epoxy or other floor finishes?  Anyone
> used them in a garage?

THE very best finish is 'Lumi-Plate'. The second best is 'Master-Plate'.
Both are dry-cast, trowel in products. (Spread 'em on the surface after
screeding, before troweling.)
Each will make the surface four to eight times harder than it would
otherwise be.

Each of these uses steel filings as aggregate, Lumi-Plate uses stainless
filings--so , for a wet environment, Lumi-Plate is the way to go. It also
gives a much brighter surface, hence the name.

A spray-on, membrane forming curing compound ALSO helps the cure/strength a
LOT. You can also accomplish this the old fashioned way-- lay burlap over
the surface and keep it wet for a week to a month---

Apply sealer ('silane' is good) or paint/epoxy as desired. Any surface
coating is ONLY as good as the concrete under it !!!

A sheet of (6 mil thick) visquene over the gravel under the slab will
GREATLY improve the cure and consequently the strength of a slab. Beware--a
LOT of finisher will claim otherwise, this is BS. Without the plastic
underneath, the gravel pulls a lot of the water out of the concrete,
quickly. This is BAD for the cure, but also make it 'go off' much
faster--thus letting the finishers get their work done and go home sooner !!

Greg


> 
> BTW the final plans include enough space to park 2
> cars end to end, with
> the furthest back space having a 4 post Eagle lift. 
> Can't wait to have
> it all set up :-)
> 
> --steve
>


       
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