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Afternoon @ososbg
Ive watched those videos so many times.... I dont trust them lol tho I keep watching them as it looks too easy. Anything that is too easy generally means there is a reason.
Id try it on a small area first, maybe a couple of bags big. Id then pull it up and "see" how strong that slab is. I cant imagine "wetting" dry concrete like that will give you the full strength of a mixed concrete, it wont bind right. Im lucky where I work we do destructive testing on methods of concrete and reenforcing concrete so I will be asking the guys about this one 
Also will add in I was doing 10 of 20kg bags of concrete per 4 holes for supporting my deck. It was a workout and a half doing that per day lol
My car knew it had 200kgs in the boot for sure!
The cheapest wheelbarrow. It actually lasted until the last bag I dropped into it and I heard a large "CRACK" as the tub cracked 
Made sure I was close to the holes as possible as wet concrete is heavy.
This is why I have a problem with dry concrete, it dosnt bind the way it does when mixed properly. I suspect it would crack easily and not harden for a long period of time.
Doing it this way, I have had no issues with cracking or it moving either.
I have used the quickset concrete for posts Australian Builders 20kg Quick Set Concrete and remember not being confidant it would work as the water was eiither way to much or soaking away like crazy.
Would love to see a project put up if you try it. It would certainly be interesting.
Dave
Hi @JacobZ and @Dave-1 , thank you for your reply, your last sentence sums up everything for me, as a newbie, I fully rely on expert advise like yourself to tell me what's good and what's bad. I'll do some math, but it looks like it's risky even if the math says it might be cheaper, there's a high risk for this fail in few months or a year and at this time I'll cost me even more to fix it. Plus the extra workout that Dave was talking about.
One more question for you, if i'll got with a concrete mixer or a concrete truck, is it a one man's job or it requires at least 2 people? Also let me know what the team will say about this video once they test it, keen to hear from the experts with hands on
Afternoon @ososbg
Ive never tried laying a slab of concrete yet Purposfully I might say. Not for the reason you might expect. Having had to break up my concrete side path its given me an aversion to putting something so solid and large down as one day it will have to be broken up. Doing the mix of ten bags and pour was solid work, if you maybe staggered your slab into three sections and then did the same over three days (or six ) I would think its possible. So a one mans job with a wheelbarrow id say is possible.
I much prefer pavers and a solid base to lay them on. I like moving things around and depending on what you want from your shed it coupd be a backup option?
Dave
