You may want to consider a polishable overlay. Shayne makes excellent points, especially about the moisture content of the concrete. When I'm specifying a polished finish, this is my starting point:
033543 Polished Concrete Finishing
Includes ground and polished concrete floor slabs, including stained and polished concrete.
Coordinate colorants, aggregates, and castings with the Owner.
Concrete: Use normal weight concrete only, no air entrainment. Do not use volcanic aggregate for areas to receive an exposed aggregate finish. Admixtures may be used, except for calcium chloride accelerators.
Densifier: Duraamen Hermetix Densifier, www.duraamen.com.
Sealer: Duraamen Hermetix Protector, www.duraamen.com.
Comply with the General Requirements.
Curing: Water curing is best to minimize edge and joint curling. Do not use topical curing agents that will act as a barrier to densifier penetration.
Densification: Allow concrete to cure a minimum of 28 days before application of the densifier. Apply densifier ten days prior to installation of equipment and substantial completion to provide a complete, uninhibited concrete slab for application.
Placement: Pour and work concrete to achieve a minimum Floor Flatness rating of 40 and minimum Floor Levelness rating of 40, where possible.
Polishing: Perform the entire polishing process prior to erecting non-load bearing partition studs. Achieve the following finish: Coordinate the finish with the Owner:
• Level 1 – matte finish (150 grit final polish).
• Level 2 – satin finish (400 grit final polish).
• Level 3 –medium sheen finish (800 grit final polish).
• Level 4 – mirror finish (1800 grit final polish).
• Class A – cream (no exposed aggregate)
• Class B – salt and pepper (1/16” exposed sand, small aggregate).
• Class C – medium aggregate (1/8”-1/4” exposed aggregate).
• Class D – heavy aggregate (1/4”-1/2” exposed aggregate).
Protection: Protect the concrete slab from damage both before and after polishing. All hydraulic powered equipment must be diapered to avoid staining of the concrete. No trade will park vehicles on the slab unless necessary; always use drop cloths beneath the vehicles. Do not stack or store construction materials or chemicals on the slab.