Don't know.
I have exposed aggregate driveway and around house, and it requires a good ol karcher every year to get the dirt and grime off it.
Once you do this though it looks great.
In saying this, if I used a sealer, it may mitigate the need.
F
Roughly, your supply charge for readymix would be about $2,500 max.
Therfore you are paying labour (and little bit of materials) of $7,500 for something that is a 10m x 10m slab that is stencilled?
F