For new concrete substrates & suitable existing concrete substrates…
PARTIAL EXPOSURE is where the minimum possible exposure of aggregate is sought by mechanically grinding to remove approx. 1-2mm of the concrete surface.
The evenness of aggregate exposed is reliant upon the quality of the slab and the concreter.
Partial exposure can be achieved with a consistency of aggregate density if the slab is prepared by an experienced concreter who understands the finishing required.
Partial exposure is not difficult to achieve with a professionally poured slab where the concreter knows how to prevent screed bar marks, footprints, and bare edges where the stone has been pushed too low.
A consistent slump of concrete mix with each load of concrete delivered will also help to ensure a consistent density of exposure.
If you, your architect, or designer really desire this look, it is important to understand these principals. Most experienced concreters will be able to deliver a slab along these lines should you request it.
We can’t emphasis enough how important it is to have a good concreter, Southeast Floors cannot be responsible for the standard of the slab and as such cannot guarantee that some screed marks, some areas of lower exposure than desired, or footprints may be visible.