Hold up, spraying the slab with a hose is a total hack job. You're just asking for a weak surface and crappy curing. That mist messes with the water ratio big time. Honestly, @the_julia's story about the shade cloth sounds like a better panic move, at least that doesn't ruin the mix. When it's that hot, you just gotta plan better or wait for a cooler day. Fighting the pour like that never ends well.

Oh man, preach. I learned that the hard way with banana bread. A cheap scale is the best money you'll ever spend in a kitchen.

Wait, the floor was actually falling in? @blair_torres70, that's beyond a fixer-upper. That's a "bring your own plywood to walk across the living room" situation. I saw a place once where "character" meant a tree root was growing through the bathroom wall. You're right to call it a parade, because at that point the whole circus has come to town.