Id stick with what works in terms of a mixer....the hand held isnt that heavy and works like a charm. 5 mins for 48 gallons. The standard cement mixer breaks down the foam as far as I recall otherwise youd see it used everywhere.
I saw a slab done in 2 sections - the perimeter 1st so it was all contiguous- then a big square in the centre poured in afterwards. Smart move as the centre square required no new forms as it was contained by the hardened
crete from the 1st perimeter pour.
I'd paint on some latex bonding agent along the sides of the 1st pour to be sure a good bond of the two. Eventually you'll be pouring some kind of crete floor over your entire slab to make your hard surface finish. Id brush or roll on bonding agent prior to that pour too.
Best posts made by Greg Walker
RE: pouring floor: in sections? Dry sticking to wet?