Grinding hard concrete takes longer than grinding soft concrete. Whatever the machine size or diamond type, a harder surface will be more difficult to abrade. As is true for the machines and diamonds being subject to this fact, the concrete hardness can always be countered by using water. Water, even a small amount, acts as a non-reactive, residue free cutting lubricant. The addition of silica sand (used here) helps, but the water does the work to speed the cutting.

The video shows a hard, cure-n-seal covered concrete slab being cut at a rate of 300SF/hour. The use of a water mist and sand makes this possible. It also shows how a diamond tool (usually used to cut medium concrete) can have its performance ability changed. Without water there’s a good chance the labor time would triple. With a simple mist, however, this 900SF garage was ground in less than three hours.
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