To some extent, the processing is similar to work on old, weather or traffic beat surface, the density of top surface is very 'loose', which is not cured enough. As you can see the passage of the grinder produces a lot of ground dust. So when you use diamond shoes, they must be proper bond and grit. The thumb of rules is to choose lower grit (depends on how much you want to cut the floor) and softer bond of diamond segments. The wrong application may result in less work performance and higher cost.