Thor, or should that be Zeus?

[Clive S]

Tom I am not sure you are understanding this way of moulding concrete as it is done with superplasticiser which makes a very fluid mix and MUST NOT be vibrated as it will settle the aggregate to the bottom. The way it works is that it separates all the individual fines and stones in suspension for about half an hour then they come back together for the set.
This explains it better. https://www.youtube.com/watch?v=9ySyaKb2_b0 and here https://www.youtube.com/watch?v=ICp4...w#t=107.971789

[Tom J]

Tom I am not sure you are understanding this way of moulding concrete as it is done with superplasticiser which makes a very fluid mix and MUST NOT be vibrated as it will settle the aggregate to the bottom. The way it works is that it separates all the individual fines and stones in suspension for about half an hour then they come back together for the set.
This explains it better. https://www.youtube.com/watch?v=9ySyaKb2_b0

ok, I was referring to cement mix with coarse sand. Got your point guys

[Chaz]

Should add that the mix goes through bed/slipper which is kind of mold and is compacted by packshaft with fingers - layer of concrete is 12mm thick and travel 1m/s speed.
In your case vibrating plate is a must. Curing process is complex too (4 stages with extra water), retarder is used to slow curing process.
Since I work there, I use min amount of water (just for mix to be not brittle) - for diy concrete job

Agreed with Clive S, plus, this wouldnt be something I could do from my garage ...

Plus, there is no air bubbles in my mix, this I am certain of.