I have bought a pre-mix "multi purpose" concrete. The mix appears to be mixed with sand and small stones.
I have seen Creating a concrete mix with smooth texture which is about how to make it smooth and this kind of answered my question but, I'm not totally fussed about it being smooth (well, I am, but that isn't my question)
The issue I have is, I'm leveling a floor by a tiny amount but the size of the stones are too big and I can't taper it as I'd like. This means at one side, the concrete may have a a height of 3 inches, and the other, 1mm.
I've put down a bonding agent, I've mixed the concrete, spread it out and of course, with stones/pebbles over 1mm high, I can't get it smooth/low enough enough in height.
I don't understand why there are these bigger stones in the mix. My own research shows nothing. My own brain tells me, it's to fill it out to reduce cost! If the stones were removed, more stand/cement would be needed and cost would go up.
If my brain is right, could I have sieved the mix first (and then add water as expected) to remove the larger stones to have produced a thinner surface (and would it still set)?