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Concrete typically has more water than it needs for the reaction, to aid placement.
The ground you are laying the concrete onto will act as a heat sink.
Thick slab with vibrating pole, or just relying upon gravity and tamping.
You might find a bit more time spent ensuring the upper surface is well tamped will reduce the likelihood of unwanted cracking.
mespilus
Sam_w
So in a bit of awful timing, I am laying a concrete slab in the middle of the day today, lorry arriving at 1pm. It's too late to change the timing, as it is the only time the supplier and helper can be here.
Obviously the hot dry weather is not ideal, so worried about the concrete going off too quickly and cracking. I have some massive tarps, is it worth making a frame over the pad and covering with the tarp to try and slow it down? Or will this be counter productive?