Specifications for New Concrete to be Polished

Preferred Mix Design Specs

• 3500 psi minimum
• Pozzolans—No more than 15% cement replacement is recommended
• Admixtures—in moderation, admixtures are ok for use with polished concrete. Superplasticizers will require removal with a stripper before attempting to grind and polish

Preferred Flatwork Finishing Specs

• Preferred Floor Flatness (FF) of 50
• Preferred Floor Levelness (FL) of 35
• Alternative to FF/FL is the strike-off method:
• 0"–1/8" is favorable
• 1/8"–1/4" is wavy/unfavorable
• Bull-floated, smooth, pan-finished floor from edge to edge, with no rough areas
• Concrete Compressive Strength: 3,500psi to 5,000psi
• Lightweight Concrete: Not allowed if aggregate exposure is required.
• Concrete Curing: Minimum 8 days water cured or dissipating curing compound applied.
• Laser screeding is good for ensuring flatness.

• No trowel marks
• Do not burn when power troweling
• No indentions left on surface (ex: knee marks, shoe prints)

Concrete must cure for at least 28 days before polishing

For more information about shot blasting, surface preparation or other services available from Shot Blast Inc., or call at 610.494.1330.

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