Most concrete floors need 4 to 8 grinding passes to go from raw slab to a polished finish: 1-2 passes for surface prep and coating removal, 2-3 passes of metal bond grinding to level and refine, then 3-4 passes of resin honing and polishing. The exact number depends on the condition of the slab, the hardness of the concrete and the finish level you want — a high-gloss commercial floor needs more passes than a satin warehouse floor.
Each pass removes a thin layer of concrete and leaves scratches of a controlled depth. Counting passes is the reliable way to know when the surface is ready for the next grit: it tells you whether you have actually covered the whole floor evenly, and it prevents you from stopping too early (deep scratches remain) or grinding too long (unnecessary wear and dust). A good rule is one full pass = one complete coverage of the floor with overlapping tool paths.
| Stage | Typical Passes | Tool / Grit | Goal |
|---|---|---|---|
| Coating / glue removal | 1-2 | PCD tooling or coarse metal bond (30/40) | Remove coatings, mastics, curing compounds |
| Coarse grinding | 2-3 | Metal bond 50/60 - 80/100 | Level lippage, open the surface, remove deep scratches |
| Fine grinding / honing | 2-3 | Resin bond 120 - 400 | Remove metal scratches, prepare for polish |
| Polishing | 2-4 | Resin bond 800 - 3000 | Build the sheen and final gloss level |
A: No. One pass only removes a thin layer and leaves the scratches of that one grit. A professional polished floor always needs multiple passes stepping up through the grits.
A: Check the floor visually after each pass: uniform colour, no visible scratches in any direction, and the tool no longer cutting hard all mean the stage is complete.
A: Usually yes, with the same tooling. Hard, dense concrete is slow to cut, so you often repeat a grit rather than skip ahead. Using a softer bond metal segment helps.
A: Only for a light honing job on an already flat slab. For a real polished finish, skipping metal bond leaves deep scratches that resin pads cannot remove.
A: Expect 1-2 passes of PCD or coarse metal tooling for the coating itself, then the normal grinding and polishing sequence — about 6-8 passes total.
Counting passes is the simplest way to control quality on a concrete grinding job. Plan for 4-8 passes depending on the slab and finish, always step up grits in order, and vacuum between stages. JOY TECH manufactures the full range of metal bond discs, resin pads and PCD tooling for every stage of the sequence — Double S Segment Grinding Disc (JOY-TP-S2) and 3" Metal Bond Disc (JOY-TP3-B4) are great starting points. Contact us with your slab condition and target finish, and we will help you pick the right pass plan and tooling.
