Definitely slope away from the center. Concrete guys like to pour stuff flat and level, but don't forget that water needs to run off or it sets in one spot. Even if the floor looks to be dead-on, it will still puddle someplace. When designing “flat” surfaces on something like you are planning, we always figured at least 1/10 of a foot (about 1 & 1/4 inches) of slope to each 10 feet of run to keep water from puddling on the surface. In your 18 foot diameter crib, I would figure at least 2/10 of a foot of slope away from the center to the sides of the circle. 2 - 1/2 or 3 inches wouldn't hurt a thing in 9 feet and you will never notice the rise. If you pack your base well, you can slope that too and save a bunch of concrete. It’s REALLY IMPORTANT to have good base compaction to prevent the concrete from settling and cracking over time. I would also use wire mesh or plastic fiber in the concrete to aid in preventing cracks. The plastic stuff that is available works well for that. It’s less expensive than wire. (Talk to your redi-mix guy.) I’d use a six bag mix, too for a 4" floor due to the weight requirements. This advice comes from a retired engineering technician. (My $0.02 worth. jal-SD)
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