Posted by Billy NY on March 21, 2012 at 12:49:45 from (67.248.100.3):
In Reply to: Re: OT wash stalls posted by Heyseed on March 21, 2012 at 12:14:50:
I don't see why you could not pour it as one monolithic slab, the rebar detail and expansion joint would not be a good idea, water is going to get in there. I've done a lot of concrete in the past, at 6" thick properly reinforced with 4000 psi it would appear that should hold without fracturing, but with all the other people who have done concrete, be great to hear some more comment on a fairly typical slab like this, especially for washing, and being constantly wet, horses with shoes, abrasion, I'd want 5000 PSI, (overkill but better on abrasion) They usually sawcut strategically to a certain depth to control cracking, but a stand alone slab, 12'-0" x 20'-0" would appear to expand and contract without interference whereas you need asphalt impregnated expansion board or the modern equivalent which is a better material, like rubber. I assume it will be 2 10'-0" wide stalls ? A divider and 2 separate slabs comes to mind here, as well as sides with cross ties, hitch post or something, if you pour around those, expansion joint is probably advisable. You definitely want to figure out those details prior to slab design, (divider, hitch post, side panels, and how they fasten, post in the earth, abutted by the slab or what have you) Include consideration for corrosion of these fasteners or at joints etc. materials need to stand up to that.
If you were to install it, you need to place an elastomeric sealant over it to seal up that joint from water, rebar needs to terminate with enough edge distance to cover the rebar in all directions. Mostly common sense, given a wet location, your design should encompass that so the end result performs without problems.
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