Posted by Check Break on March 08, 2012 at 23:04:51 from (96.238.223.127):
In Reply to: concrete wash pad posted by bill mart on March 07, 2012 at 15:24:47:
A 6" slab is fine. Do not cast a footing around the perimeter. Wire mesh will work. You might think about No.3 rebar but rebar will cause more cracks than wire. Saw cut control joints in the slab 1/3 the depth of the slab on no less than 10' x 10' centers the day of placement, not the next day or a week later. DO NOT dig the slab down below grade. You want to break the bond between the slab and the ground. Burying the slab will increase the bond and prevent the slab from moving when the ground freezes and heaves, causing the slab to crack. Talk to your local ready mix company about base. Does anyone in your area use 1.5" drain rock or pea gravel for base. The ready mix supplier always gets accused of selling bad concrete when the cracks appear and will be well informed about what you need to do to avoid a similar problem. Put as much rock as you can afford under the slab and drain all the water away from the slab and the base. A wash pad in an area that freezes is just waiting for the ground to expand and heave. If the slab is totally separated from the soil, it will rise in one piece and subside in one piece when the ground thaws. Hope this helps.
There's 200 ways to screw up good concrete. You didn't mention what time of year you would be placing the mud and what the weather conditions would be like. These factors will have a big impact on your slab as well.
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