On Monday, 18 May 2020 14:23:50 UTC+1, Broadback wrote:
I am looking for a concrete that contains small size "stones". Is there
such a thing? fine concrete is a different thing altogether I have found.

The size of aggregate requires depends on the thickness of the concrete. Thinner concrete = smaller aggregate.
10/1 is about right

ie 10mm aggregate for 100mm thick concrete.

You can buy it premixed, eg 10mm down to dust, only the cement needed to be added. In bags or loose if in large amounts.