When sanding a concrete staircase, you must distinguish between the "cleansing" and the actual, abrasive sanding of the concrete. Especially with a concrete staircase, the actual grinding is a little more complicated, but is feasible. Below we have put together information about grinding concrete stairs for you.
Treating Concrete with Conventional GrindersWe will show you in detail how to make your concrete staircase slip-resistant by following this link.
Incidentally, the Romans have already used water glass to seal water pipes.